California Air Resources Board 1 April 11, 2024
Electric Power Entity Reporting Requirements Frequently Asked Questions (FAQs)
for California’s Mandatory GHG Reporting Program
Introduction
CARB has developed this FAQ document on issues that pertain to reporting
requirements for Electric Power Entities (EPE) under the Regulation for the Mandatory
Reporting of Greenhouse Gas Emissions (title 17, California Code of Regulations,
section 95100 et seq) (MRR). These FAQs respond to questions and comments from
stakeholders on specified source electrical imports, meter data requirements, renewable
electricity and Renewable Energy Credits (REC), and reporting electricity sales into
California Independent System Operator (CAISO) markets.
Unlike MRR, this guidance does not have the force of law, does not establish new
mandatory requirements for greenhouse gas (GHG) reporting, and in no way supplants,
replaces, or amends any of the legal requirements of the Regulation. Conversely, an
omission or truncation of regulatory requirements in this guidance does not relieve
operators of their legal obligation to fully comply with all requirements of MRR.
This document provides answers to frequently asked questions that CARB has received
from EPEs. These answers may be based in part on case-specific factual
circumstances and are offered here only as guidance that does not supplant the
requirements of MRR.
FAQs section 9 on the reporting of imports via energy storage systems has been added.
This document references the 2018 MRR. The 2018 MRR contains amendments
approved by the Board on December 21, 2018. The 2018 MRR has an effective date
of April 1, 2019 and must be used for reporting data year 2019 emissions onward.
The 2018 MRR is available at: https://ww3.arb.ca.gov/cc/reporting/ghg-
rep/regulation/mrr-2018-unofficial-2019-4-3.pdf
This document also references CARB’s 2018 Cap-and-Trade Regulation (title 17, CCR,
sections 95801 et. seq.), which is available at:
https://arb.ca.gov/cc/capandtrade/ct_reg_unofficial.pdf
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 2 April 11, 2024
Table of Contents
1.1 General Requirements for Reporting Specified Source Imports .................. 4
1.2 Seller Warranty ........................................................................................... 7
1.3 Short-Term Transactions ............................................................................ 8
1.4 Asset Controlling Supplier Requirements .................................................. 10
2.1 Overview of the Meter Data Requirement ................................................. 13
2.2 Lesser of Analysis ..................................................................................... 15
4.1 Renewable Energy Credits........................................................................ 20
4.2 REC Requirements for Specified Source Imports ..................................... 21
5.1 Who must report sales into CAISO markets? ............................................ 22
5.2 Why must POUs and co-ops report CAISO sales? ................................... 23
5.3 Does an EPE still have to report, even if it didn’t sell any power into CAISO
markets? ................................................................................................... 23
5.4 What constitutes a sale into CAISO markets under section 95111(a)(12)?
.................................................................................................................. 23
5.5 What is an Electrical Distribution Utility (EDU) compliance obligation under
section 95111(a)(12)? ............................................................................... 24
5.6 How does a POU or co-op report sales into CAISO markets? .................. 24
5.7 Which emission factors should an EDU use to report CAISO sales under
section 95111(a)(12)? ............................................................................... 25
5.8 When should an EDU use a system emission factor, that is not listed in
ONE, to report CAISO sales under section 95111(a)(12)? ....................... 25
6.1 Are EPEs required to report EIM imports and exports under MRR? ......... 26
6.2 What CAISO settlement data should be used when reporting EIM imports?
.................................................................................................................. 26
6.3 Are EIM imports subject to the Lesser of Analysis (LOA)? ........................ 26
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 3 April 11, 2024
6.4 For CY2019 Only [Obsolete] ..................................................................... 27
6.5 For CY2019 Only [Obsolete] ..................................................................... 27
6.6 How are EIM imports identified as an EIM Import in ONE in either the
Specified Imports or Unspecified Imports tab? .......................................... 27
6.7 Should EIM imports reported as result of the Lesser of Analysis be reported
as “EIM” or “Metered” in the “E-Tagged, Metered, or EIM?” field in ONE? 27
7.1 Do EPEs have to report retail sales that serve California load? ................ 27
7.2 What constitutes “retail sales of electricity” under MRR? .......................... 27
7.3 How should CPUC-registered electric service providers (ESP) report? .... 28
7.4 Can an EPE report retail sales for an affiliated ESP or community choice
aggregator (CCA)? .................................................................................... 28
8.1 Imports and/or Exports: When an EPE stops importing and exporting
power, how much longer does the EPE have to report and verify? ........... 29
8.2 The EPE I represent had ceased importing and exporting electricity in the
California market in 2020. When am I eligible to cease reporting and
verification? ............................................................................................... 30
8.3 Wheels: When an EPE only has “wheeled electricity through California” to
report, does the EPE have to report and verify? ....................................... 30
9.1 What constitutes an ESS? ........................................................................ 30
9.2 How should imports from ESS sources be reported? ................................ 31
9.3 How should imports with an ESS as the originating source be reported? . 31
9.4 Does power flowing through an ESS incur any additional losses that are
accounted for? .......................................................................................... 31
9.5 How should power subject to the Meter Data Requirement of
§95111(b)(2)(E) (lesser of analysis) be reported?..................................... 31
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 4 April 11, 2024
1 Specified and Unspecified Source Electrical Imports
This section describes the requirements for specified source imports, seller warranty,
short-term transactions, Asset Controlling Suppliers (ACS), and ACS power.
1.1 General Requirements for Reporting Specified Source Imports
The following FAQs address general questions for reporting specified source electrical
imports under MRR, including what criteria must be met to claim imported power as
from a specified source.
1.1.1 What criteria must be met for imported electricity to be reported as from a
specified source?
If imported electricity meets specified source requirements in MRR, it must be reported
as such. To report imported power as from a specified source, an EPE must have a
specified source power contract and the power must meet direct delivery requirements
(generally through e-tag documentation). In addition, for electricity reported as specified,
the REC serial numbers associated with the specified import must be reported, if
applicable. These requirements are described in section 95852(b)(3) of the Cap-and-
Trade Regulation and section 95111 of MRR. Specific reporting requirements on
aggregation, seller warranty, and measurement are set forth in section 95111(a)(2) and
(4) of MRR. See section 4.2 below for more details on specified import REC reporting.
Importers that directly deliver power meeting all specified source requirements may not
“voluntarily” report the power as unspecified, regardless of REC ownership or ability to
obtain REC serial number data (section 95111(a)(4)). This includes electricity conveyed
to the importer as specified under seller warranty provisions, as well as when specified
source electricity is imported by the GPE. This is the case regardless of any contracts
dictating sale or ownership status of RECs, and regardless of contracts that seek to
convey greenhouse gas benefits of zero emission power to other counterparties.
1.1.2 For imports made on behalf of a retail provider, does the retail provider
need to report all of the details of the import (as if they were the
importer), including REC serial numbers?
Section 95111(c)(4) of MRR requires retail providers that report any imports or exports
to also report electricity imported on their behalf to serve their load and identify the
importing first deliverers. In ONE, the Excel workbook used for reporting EPE
transactions in the California Electronic Greenhouse Gas Reporting Tool (Cal e-GGRT),
retail providers must report all of the details of “on behalf of” imports (as if they were the
importer), except that they would select “No” to the question “Are YOU the PSE on the
NERC e-Tag in the Physical Path table on the last California border crossing?”. This
applies to both specified and unspecified imports, including electricity from California
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 5 April 11, 2024
Renewables Portfolio Standard (RPS) eligible renewable energy resources. However,
REC serial numbers associated with specified source power must be reported only by
the entity that imported that power. “On behalf of” retail providers should not report REC
serial numbers associated with electric power imported by another entity. In addition,
retail providers should not report REC serial numbers for in-State power.
1.1.3 Can substitute power be provided by a specified source?
Yes. Substitute power can be provided by a specified source. However, it is generally
the case that ancillary services for transmission are provided as unspecified power from
within the host balancing authority area (BAA). An EPE must provide appropriate
documentation, such as a specified source contract for substitute power (also referred
to as ancillary services power), to the verifier and CARB to substantiate the specified
source claim.
1.1.4 Can a specified source include more than one facility?
In general, multiple power generation facilities cannot constitute a single specified
source under MRR, except for ACSs which are approved and registered by CARB (see
section 1.4 on ACSs for more details). Under section 95102(a) of MRR a specified
source of electricity is a facility or unit that can be claimed as a delivered source of
electricity. Thus, a reporting entity cannot register multiple units as a single facility or
source, for purposes of obtaining a single specified source emission factor. However,
multiple dams operated under a single Federal Energy Regulatory Commission (FERC)
license may be considered one facility.
1.1.5 What is a generation providing entity (GPE) as it pertains to a specified
source?
A generation providing entity (GPE) is a full or partial owner, generating unit operator, or
party to a contract for a fixed percentage of the net generation from a specified source
(see GPE definition in section 95102(a) of MRR). An entity that is entitled to a share of
the total capacity or total output of a facility meets the GPE definition, whereas an entity
that is entitled only a fixed MW or MWh amount does not.
1.1.6 Does a generation providing entity (GPE) have to report power imported
from a specified source (for which it is a GPE) as specified source
power?
When the power is directly delivered, the importer “must report all direct delivery of
electricity as from a specified source for facilities or units in which they are a generation
providing entity (GPE) or have a written power contract to procure electricity,” per
section 95111(a)(4) of MRR. However, an e-Tag alone is not definitive, and the power
contract must also be examined for consistency with regulatory requirements. This is
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 6 April 11, 2024
the case regardless of REC ownership, or if the counterparty to the sale seeks to claim
an associated RPS adjustment. As explained in the Reporting and Verification
Guidance for RPS Adjustment Claims document, the RECs associated with electricity
that is directly delivered are not eligible to be claimed as an RPS adjustment. Entities
cannot voluntarily report specified source power as unspecified.
GPEs who import specified power must still conduct a lesser of analysis when required
by section 95111(b)(2)(E) of MRR and must report substitute electricity as unspecified,
consistent with the “unspecified source” definition in section 95102 of MRR.
1.1.7 Must imported electricity associated with firming and shaping contracts
be reported as specified?
As described in the Reporting and Verification Guidance for RPS Adjustment Claims
document, there may be some instances in which the electricity associated with firming
and shaping contracts results in directly delivered power that must be reported as a
specified import. In many firming and shaping contract arrangements, the importer
imports power firmed and shaped by the local balancing authority. Under these
arrangements, some electricity importers may claim purchased RECs associated with
electricity purchased from a renewable facility owned by a GPE, and then subsequently
sell that electricity into the local balancing authority area. In these cases, tagged imports
associated with the firming and shaping contract may come from a variety of sources
and interties within the GPE’s local balancing authority area. However, many GPEs will
provide firmed and shaped electricity tagged directly from the renewable facility when
the facility is operating sufficient to meet those needs. In these situations, the importer
must report the imports generated by and tagged from the renewable facility as
specified source imports, and the RECs associated with this electricity cannot be
reported as an RPS adjustment. Electricity imported from the renewable facility is
subject to the lesser of analysis, and only the lesser of the tagged or generated amount
would be reported as specified imported electricity. Electricity purchased from the
renewable facility, but confirmed to have sunk outside of California, and with which the
associated RECs have been purchased and retired, may be eligible for an RPS
adjustment.
1.1.8 What happens if there is a mismatch between the contracted source and
the tag source?
Under MRR section 95102(a), the specified source of electricity definition requires that
the electricity importer have the right of ownership or a written power contract (which
also pertains to verbal contracts), and the directly delivered definition requires that
electricity be directly delivered to the California grid. Under MRR, the definition of
“Power contract” or “written power contract” for a specified source contract is contingent
upon the delivery of power from a particular facility, unit, or asset-controlling supplier’s
system that is designated at the time the transaction is executed. The “source of
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 7 April 11, 2024
generation” or “generation source” is defined under MRR as the generation source
identified on the physical path of NERC e-Tags. Thus, the contract source must match
the source on the physical path of the final delivered e-Tag. Mismatched sources, even
if similar or equal in carbon content, are nonetheless mismatched and cannot be
claimed as specified source power.
Transactions can only be claimed as specified source imported power if all applicable
requirements are met. Power that cannot be claimed as specified must be reported as
unspecified.
1.2 Seller Warranty
The following FAQs address questions related to seller warranty requirements in MRR,
including how the requirements are applied to specified source claims.
1.2.1 What is the role of the seller warranty requirements in short-term
transactions?
The seller warranty provisions in section 95111(a)(4) of MRR are designed to correctly
identify and report specified power transactions and prevent the resale of unspecified
power as specified source power. Transactions that meet the seller warranty
requirements are eligible to be claimed as specified source imports, as long as the
requirements of MRR are met. Therefore, a reporter cannot report electricity as
specified power for transactions that do not meet the seller warranty requirements.
1.2.2 What is seller warranty, as it pertains to specified source claims?
Seller warranty is a power contract provision or guarantee in which the seller agrees to
provide power from a specified source to a buyer, such that it has not been previously
transacted as unspecified power. Seller warranty provides for greater electricity market
transparency and more accurate pricing when purchasing specified power.
1.2.3 Is it possible to resell unspecified power as specified power?
While it is technically possible to resell unspecified power as specified source power,
such a transaction would not meet the seller warranty requirements in
section 95111(a)(4), and therefore, such power must not be reported as specified under
MRR. However, if the power was reported as specified, and during the verification
process it was determined to be unspecified, the specified power would need to be
reclassified as an unspecified source transaction, which could result in an increase in
covered emissions for the reporter.
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 8 April 11, 2024
1.3 Short-Term Transactions
The following FAQs address questions related to short-term transactions of electric
power, including how the specified source requirements and seller warranty provisions
of MRR apply to short-term transactions for electric power.
1.3.1 What are short-term and long-term transactions for electric power?
Under most power contract agreements, often referred to as enabling agreements,
short-term transactions are transactions for less than one week in duration, for which
written confirmations are not required between buyer and seller, and long-term
transactions are for transactions for one week or more in duration. Short-term
transactions are typically for day-ahead or real-time power. Unlike short-term
transactions, long-term transactions generally require the use of written confirmations.
1
1.3.2 Are there any standard contracts that could be used to facilitate short-
term transactions that would meet CARB specified source requirements?
Most short-term power trading is conducted under the umbrella of one of the standard
power contract enabling agreements, e.g., the Western Systems Power Pool (WSPP),
Edison Electric Institute (EEI), or International Swaps and Derivatives Association
(ISDA). If operating under a standard agreement, power traders are bound by the
standard provisions of the agreements under which they may verbally transact. Short-
term power markets have evolved to allow for a high level of transaction precision and
efficiency for the standard confirmation provisions, including price, quantity, and delivery
point, which can be easily confirmed verbally.
2
Additionally, to facilitate reporting and
verification under MRR, WSPP members approved an optional specified source
confirmation in December 2013, referred to as Exhibit C-SS, which can be utilized in
both short-term and long-term transactions.
1.3.3 How will a verifier and CARB determine whether a short-term transaction
is from a specified source?
Short-term power transactions can be verbally transacted via phone. Although an entire
short-term transaction can be accomplished via voice record, both buyer and seller may
have very different opinions about what product was actually transacted, e.g., whether
specified or unspecified power was transacted. Thus, not all short-term transactions
may result in an explicit acknowledgement between buyer and seller of the type of
power transacted. In this scenario, an EPE may use the voice tape to indicate that the
buyer and seller agreed to a specified source product prior to execution of the
1
The WSPP standard contract agreements are available here:
https://www.wspp.org/pages/Agreement.aspx
2
Under standard enabling agreements, verbal can mean both verbal and electronic (Instant Messenger).
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 9 April 11, 2024
transaction, and thereby establish evidence of seller warranty, which can then be used
as evidence during the verification process.
A specified source claim must include (1) a contract, (2) direct delivery, and (3) a
specified source seller warranty throughout the market path.
• Contract requirement: A reporter claiming transacted electricity as specified
needs to show evidence of a contract, which can include one of the standard
enabling agreements.
• Direct delivery requirement: A reporter claiming transacted electricity as specified
needs to demonstrate direct delivery, likely by providing the standard e-Tag
documentation, which is the most common, or by demonstrating another form of
direct delivery per section 95102(a).
• Seller warranty requirement: A reporter claiming the transacted electricity as
specified needs to provide evidence of a specified power purchase seller
warranty at the time the transaction is executed. Reporters may refer to Table 1
for guidance on situations in which this requirement may be satisfied. The
examples in Table 1 are not exclusive.
Table 1: Seller Warranty Guidance for Short-Term Transactions
Specified
Source Claim
Must be
Claimed as
Unspecified
Note: This table assumes valid contract rights, and direct delivery with appropriate
source information. See Table 2 for BPA transactions.
1.3.4 What happens if a reported specified source claim is found to be invalid
during the MRR verification process?
In the event a reported specified source claim is found to be invalid during the
verification process, the reporter would be required to reclassify the transaction as
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 10 April 11, 2024
unspecified in the greenhouse gas (GHG) emissions data report. This could result in an
increase of covered emissions for the first deliverer (importer).
Please see Section 1.1 of this document for more information on the types of evidence
that may be submitted during the verification process to substantiate specified source
claims.
1.4 Asset Controlling Supplier Requirements
The following FAQs address questions related to asset controlling suppliers (ACS),
including requirements that must be met to be approved as an ACS, which entities are
approved as an ACS under MRR, and how the specified source requirements and seller
warranty provisions of MRR apply to ACS power.
1.4.1 What is an ACS?
An ACS is a specific type of EPE approved and registered by CARB. An ACS owns or
operates interconnected electricity generating facilities or serves as an exclusive
marketer for these facilities even though it does not own them. Each ACS is assigned a
system emission factor by CARB for the wholesale electricity procured from its system
and imported into California. ACS emission factors are published on a two-year lag;
e.g., 2016 emissions data is reported and verified in 2017 and then published in 2017
for use in 2018 transactions. Once approved by CARB, ACS power procured from an
ACS’s system is considered specified source power, subject to meeting all applicable
requirements.
1.4.2 What is the process for an entity to be approved as an ACS?
MRR includes provisions for an EPE to apply to become an ACS in section 95111(f).
By May 1, EPEs seeking approval must submit an ACS application, which is posted
here: https://ww2.arb.ca.gov/mrr-acs.
By June 1, the EPE must file a system emission factor calculation using FOUR
workbook, as posted on the Cal e-GGRT Reporting Form Instructions webpage.
After the system emission factor calculation has been third-party verified and CARB
approved the EPE as an ACS, CARB will post an ACS system emission factor for use
during the following calendar year.
1.4.3 Which entities are approved as an ACS under MRR?
For data year 2020 transactions, Bonneville Power Administration (BPA), Powerex, and
Tacoma Power are approved ACS entities. Powerex has withdrawn their 2020 ACS
application and will no longer transact power as an ACS effective January 2021. Please
see the CARB Mandatory GHG Reporting – Asset Controlling Supplier webpage, for
more details on approved ACS entities: https://ww2.arb.ca.gov/mrr-acs.
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 11 April 11, 2024
1.4.4 What evidence does an importer need to provide for CARB to recognize a
short-term purchase from BPA as specified source ACS power with the
BPA ACS emission factor?
Reporters can use the BPA ACS emission factor for electricity imported from BPA, if the
reporter can meet the seller warranty requirements for short-term transactions.
Reporters can use Table 2 to determine if they meet the seller warranty requirements
and have sufficient evidence to claim the BPA ACS emission factor for short-term
transactions.
Table 2: Seller Warranty Guidance Short-Term Transactions for BPA Power
Buyer Purchase Scenarios
Transacted Directly with
BPA
Transacted
with
Intermediate
Seller
Unspecified Power Via
Exchange or Broker*
Specified
Source Claim at
the BPA ACS
emission rate
Regardless of contracted
amount, tags that show
source as “BPA Power” or
“BPA Slice” and were
transacted directly with
BPA must be claimed as
specified
See Table 1
guidance for
seller warranty
A specified source claim is
not allowed, because the
transacted power was by
definition unspecified, as
the source was unknown
prior to contract execution
Must be
Claimed as
Unspecified
Path out power received
from BPA via e-Tag (does
not list BPA Power” or
“BPA Slice” as source on
e-Tag) must be claimed
as unspecified
See Table 1
guidance for
seller warranty
Must be claimed as
unspecified, because
buyer did not know source
prior to contract execution
Note: This table assumes valid contract rights and direct delivery with appropriate
source information.
*Power can be transacted via broker as specified, and CARB regulations and guidance
in no way prohibit brokered specified source sales, so long as all applicable specified
source requirements are met.
1.4.5 How do Powerex, Tacoma, and BPA differ as ACSs?
BPA, Powerex, and Tacoma are distinct entities with different capabilities and
responsibilities, as described here. BPA only sells power from one source – its overall
system portfolio. According to BPA, under its federal mandate, it cannot sell power from
individual specified sources, nor can it self-market unspecified power, whereas Powerex
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 12 April 11, 2024
and Tacoma can do both. Powerex and Tacoma can sell power from multiple sources,
including specified, unspecified, or ACS power.
Although Bonneville considers all of its sales as sourced from the BPA system, CARB
differentiates between Bonneville sales from two sources based on e-Tags: BPA ACS
power and path out power. Bonneville tags power from either BPA Power or BPA Slice
(both of which are ACS power), or from non-BPA power sources (that were originally
procured for use by the BPA system). Bonneville sales tagged from a non-BPA source,
but sold by Bonneville as BPA power are referred to as path outs, or path out power.
Thus, buyers of BPA power may end up receiving e-Tags sourced as BPA Power, BPA
Slice, or as path out power. Transactions tagged as BPA path out power, where BPA is
the seller, but the source is not the BPA ACS system, are not eligible to be claimed as
specified source power, and therefore may not use the ACS emission factor for BPA.
A specified source contract is also required to claim ACS power, including from BPA. In
contrast, path out power tags received as part of a BPA purchase must be claimed as
unspecified for calendar year 2013 and beyond. Entities that transact directly with BPA
must claim specified ACS power when tagged with the source as either “BPA Power” or
“BPA Slice.” For questions on how to report BPA ACS power, please contact CARB.
Powerex has withdrawn their 2020 ACS application and will no longer transact power as
an ACS effective January 2021.
1.4.6 What power purchases made by an ACS will be included in its system
emission factor calculation, and will thus be considered part of its ACS
system footprint?
The ACS system emission factor calculation includes components for purchased
electricity from specified and unspecified sources. Power purchases that sink to serve
load or to maintain reliability of the ACSs system are included in the system emission
factor calculation. Purchases intended to serve load or maintain system reliability that
were sold as path outs will not be included in the system emission factor calculation.
1.4.7 When buying BPA Slice power, what documentation should be made
available to a verifier to meet the seller warranty requirements?
For short-term and long-term transactions, EPEs must comply with the specified source
requirements in MRR. In general, the importer must establish evidence of seller
warranty for the transaction, meaning that the seller has specified source rights to the
BPA Slice power. For instance, for a transaction between an entity that has specified
source rights to BPA Slice power and an entity that imports the power to California,
evidence of seller warranty can be established through the following:
1. A confirmation between the BPA Slice holder and the importer. For long-term
transactions, the reporter could provide a written confirmation between the BPA
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 13 April 11, 2024
Slice holder and counterparty for each trade, denoting a sale of specified source
power sourced as BPA slice. For short-term transactions, reporters should refer
to Section 1.3.3 of document.
2. A contract between the BPA Slice holder and BPA, exchanged initially between
counterparties.
1.4.8 Would a transaction using the WSPP contract (Schedule C) qualify as
having a contract for specific source or ACS imports?
Yes. A transaction using the WSPP contract (Schedule C) qualifies as having a contract
for specified source or ACS imports. Acceptable forms of a specified contract may
include, but are not limited to, modified versions of either the WSPP Agreement
Schedule B (Unit Commitment Service) or Schedule C (Firm Capacity/Energy Sale or
Exchange Service) that specify the power is from the ACS system. Other contract forms
that specify the source (e.g., a particular facility, unit, or ACS system) at the time of
entry into the contract are also acceptable. A contract for a source of electricity that is
not a specified source at the time of entry into the transaction to procure the electricity is
unacceptable for the purposes of reporting a specified import.
More information can be found on the ACS webpage found here:
https://ww2.arb.ca.gov/mrr-acs.
2 Meter Data Requirements and Lesser of Analysis
This section describes the meter data requirement in section 95111(b)(2)(E) of MRR.
This section also describes the applicability and implementation of the lesser of
analysis.
2.1 Overview of the Meter Data Requirement
The following FAQs address questions related to the meter data requirement in
section 95111(b)(2)(E) of MRR, including what data must be retained and the types of
specified source imports for which EPEs must retain meter data.
2.1.1 What is meter generation data referred to in section 95111(b)(2)(E) of
MRR?
Meter generation data, referred to in section 95111(b)(2)(E), is the measured volume of
electrical energy in megawatt-hours (MWh) produced by the specified source that is
made available for movement on the transmission grid. An electric meter is a device
that measures the amount of electrical energy as meter data produced by a commercial
power plant. Some power plants have two meters per generation unit, one on the low-
side at the busbar and one on the high-side, while others may only have one. The low-
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 14 April 11, 2024
and high-side refer to the voltage level of the electric power as it passes from the
generator to the transmission grid.
2.1.2 Does CARB require reporting entities to submit actual meter data to
comply with section 95111(b)(2)(E) of MRR?
Power plant owners or operators may not be able to provide actual generation meter
data to reporting entities in the form of a direct data connection to an actual power plant
meter or data fields and information produced by an actual power plant meter for a
given time interval. If plant operators or owners are not able to provide actual meter
data to the reporting entity, the reporting entity may use a spreadsheet representation of
the meter data to comply with meter data requirements, along with evidence that the
meter data was provided by the power plant owner or operator. Verifiers must have
reasonable assurance that the meter data provided are an objective representation of
the actual measured electricity production.
2.1.3 Do reporting entities have to retain meter generation data for all specified
source imports?
Reporting entities do not have to retain meter generation data for all specified source
imports. Reporting entities must only retain meter generation data for those imports for
which a lesser of analysis is required, as described in Section 2.2 of this document.
2.1.4 How do reporting entities obtain meter information from a third party for
a specified source?
The process of obtaining meter data is an industry practice not addressed by MRR.
However, CARB recommends that a reporting entity contracting for renewable power
from an eligible renewable energy resource for import to California make a request for
meter data as a provision of the power contract to ensure delivery of the contracted
product.
2.1.5 Is the meter data requirement in section 95111(b)(2)(E) of MRR applicable
to specified source market purchases of imported electricity by power
marketers?
Yes. Market purchases of specified source imported electricity (i.e., hourly, daily, or
quarterly) by power marketers, including purchases from out-of-State hydro resources,
are subject to the requirements of section 95111(b)(2)(E) of MRR. Therefore, the lesser
of analysis is also applicable to these types of transactions.
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 15 April 11, 2024
2.1.6 Is the meter data requirement in section 95111(b)(2)(E) applicable to
Energy Imbalance Market (EIM) imports?
Yes. Effective January 1, 2019 EIM imports are subject to the Meter Data Requirement
and the Lesser of Analysis.
2.2 Lesser of Analysis
The following FAQs address questions related to the lesser of analysis, including a
description of the lesser of analysis and why it is required, the types of specified source
imports for which an EPE must conduct the lesser of analysis, and how an EPE
conducts the lesser of analysis for required imports.
2.2.1 What is a lesser of analysis and how do reporting entities use meter
generation data to conduct the analysis?
Reporting entities must conduct a lesser of analysis to determine the amount of
generated and scheduled power that can be reported as specified source power. Using
this analysis, reporting entities will determine the amount of power that can be reported
as specified if there is a difference between the amount of electricity generated within
an hour and the amount of electricity scheduled or metered into a California balancing
authority within that same hour. When the imported power is documented via e-Tag, the
reporting entity must compare imported power as documented on the e-Tag to the
actual meter generation data on an hourly basis. Reporting entities must only report the
lesser of the two amounts as directly delivered specified source power. Additionally,
when imported power documented on the e-Tag is greater than the amount of power
generated by the plant in that hour, the reporting entity must report the difference as an
unspecified import(s).
Both Specified and Unspecified Import line items subject to the Lesser of Analysis
should continue to be reported as “Tagged” if transacted with e-Tag, or “EIM” if deemed
through EIM, in the “E-Tagged, Metered, or EIM?” field in ONE. Only imports whose
delivery is directly metered and not transacted with e-Tag or via EIM should be reported
as “Metered”.
2.2.2 Why is a “lesser of” analysis required?
For GHG reporting purposes, MRR requires reporting entities to distinguish between
specified and unspecified power imports under section 95111(a)(2). When power is
delivered via e-Tag from an out-of-State generation resource to a sink point in
California, direct delivery occurs in hourly increments.
3
When hourly meter generation
3
In Section 95102(a) MRR defines four types of “directly delivered” power, including continuous physical
transmission from the generation source to the sink in California.
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 16 April 11, 2024
output (MWh) from a generation resource falls below scheduled hourly transmission
levels, it is standard industry practice for ancillary services or other power sources to
make up the difference. In this instance, ancillary services or other power sources are
substitute power under MRR. In order to comply with the provisions of
section 95111(a)(2), a lesser of analysis must be used when required to determine that
portion of electricity attributable to the specified source and that portion attributable to
unspecified power. This accurate accounting of all power used in California is important
to support a rigorous Cap-and-Trade Program.
2.2.3 When are reporting entities required to conduct the lesser of analysis?
Reporting entities must conduct a lesser of analysis for imports under EIM for specified
sources for which CARB has calculated an emission factor of zero, and for imports from
certain California RPS eligible renewable energy resources. These include directly
delivered imports from eligible, non-grandfathered renewable energy resources under
the RPS program as administered by the California Energy Commission (CEC) or the
California Public Utilities Commission (CPUC).
Pursuant to section 95111(b)(2)(E) of MRR, reporting entities are not required to
conduct a lesser of analysis for imports with: (1) contract or ownership agreements,
known as grandfathered contracts that meet California RPS program requirements in
Public Utilities Code Section 399.16(d) or California Code of Regulations, Title 20
Section, Division 2, Chapter 13, Section 3202(a)(2)(A), (2) dynamically tagged power
deliveries, (3) nuclear power, (4) ACS power, and (5) imports from hydroelectric
facilities for which an entity’s share of metered output on an hourly basis is not
established by power contract.
Please contact CARB staff if you have a question about whether a lesser of analysis is
required for a specific resource.
2.2.4 Are reporting entities required to conduct the lesser of analysis for
Portfolio Content Category 2 (Firmed and Shaped) REC transactions as
defined by CEC?
Portfolio Content Category (PCC) 2 firmed and shaped transactions contain two main
components: (1) renewable out-of-State power that may be sold into the local balancing
authority area or resold by the GPE, and (2) an equal amount of out-of-State electricity
that is imported to California. Reporting entities must report the unspecified imported
power associated with PCC 2 transactions as an unspecified import, which does not
require a lesser of analysis.
However, imported power associated with firmed and shaped contracts may need to be
reported as specified, if the power is tagged from the specified source and specified
source contract requirements are met, especially if the importer is the GPE. For these
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 17 April 11, 2024
specified source imports, a lesser-of analysis is required. REC reporting requirements
are discussed in section 4, below.
2.2.5 Are importers of electricity from the Mid-Columbia Hydro Projects (Mid-C
hydro) subject to the meter data requirement in section 95111(b)(2)(E)? If
yes, are importers required to conduct a lesser or analysis?
Yes. Importers of electricity from Mid-C hydro are subject to the meter data
requirements in section 95111(b)(2)(E) of MRR, and they are required to conduct a
lesser or analysis. Instead of meter generation data, entities that either own or have a
contractual allocation of Mid-C hydro generation at one or more of five non-federal
hydro projects receive allocated meter data reports that show what was received from
each hydro project, based upon ownership or contract share. The allocated meter data
represents actual output in the same way that meter generation data represents actual
output of an individual facility.
2.2.6 What documentation is required to support a specified source claim for
Mid-C hydro imports under MRR?
For imports from Mid-C hydro, importers are required to maintain the following
documentation in support of reported specified source claims for verification purposes
under MRR: (1) the power sales agreements with each of the relevant Mid-C public
utility districts showing ownership of the output of the Mid-C resource and RECs, (2) e-
Tags, and (3) the meter data in the form of an allocated meter data report from the
relevant Mid-C public utility district. Upon review, a verifier may ask for additional
information. In addition, EPEs are required to separately report substitute electricity for
each specified source claim, per section 95111(a)(2) of MRR.
2.2.7 Can you provide an example of how to conduct a lesser-of analysis for
purposes of complying with MRR?
Table 3 provides sample meter data that would be used in a lesser of analysis.
Examples 1 and 2 provide meter data that represents under- and over-generation
scenarios, respectively, from Source A.
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 18 April 11, 2024
Table 3: Meter Data Requirement During Under- and Over-Generation
Illustration for One Hour of Generation Scheduled and Delivered
Description
Example 1
Under-Generation
(MW or MWh)
Example 2
Over-Generation
(MW or MWh)
Metered Generation at Source A
85
115
Scheduled on e-Tag
100
100
Lesser of Meter or Scheduled
85
100
Zero Emission Specified Source Claim
85
100
Substitute Power
15
0
Example 1: Scheduled Power on e-Tag Exceeds Generation in the Hour.
Source A generates 85 megawatts (MW) in a given hour, but 100 MW is scheduled for
that hour on a single NERC e-Tag. Because only 85 MW is generated and 100 MW is
scheduled, an additional 15 MW must be obtained by the EPE to meet the scheduling
requirement of the e-Tag. The additional 15 MW is provided by the Transmission
Provider (TP) and consists of unspecified power from the host BAA. While 100 MW is
directly delivered to California during that hour, the reporting entity can only claim
85 MW as zero emission power, and the entity must report the remaining 15 MW as
unspecified power.
Example 2: Generated Power in the Hour Exceeds Scheduled Power on e-Tag.
Source A generates 115 MW in a given hour, but only 100 MW is scheduled for that
hour on a single NERC e-Tag. The reporting entity must only report 100 MW as
specified imported power to California. The remaining 15 MW cannot be claimed as an
import because it did not appear on the NERC e-Tag and was not delivered to
California.
2.2.8 What happens if you fail to conduct a lesser of analysis as required under
MRR?
Pursuant to section 95111(b)(2)(E) of MRR, an EPE must conduct a lesser of analysis
when applicable and must accurately report the associated specified and unspecified
electricity in the GHG emissions data report. If a reporting entity does not report
specified power as specified or does not conduct a lesser of analysis for required
sources under MRR, the verification body would identify a nonconformance, resulting in
a correctable error. If the error identified by the verification body is not corrected, it
would result in an adverse verification statement pursuant to section 95131(b)(9) of
MRR.
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 19 April 11, 2024
2.2.9 If, after conducting the lesser of analysis, I have substitute power how do
I report that in Cal e-GGRT?
As discussed in Section 2.2.2 of this document, if the amount of scheduled power
exceeds the actual power generated for the resource in a given hour, that excess would
be considered substitute power and reporting entities would report it as unspecified
power. In ONE, which is uploaded to Cal e-GGRT, reporting entities must report
substitute electricity separately for each specified source.
2.2.10 When multiple buyers receive output from a renewable facility, how do I
determine whether I have to report substitute electricity and not another
counterparty? For instance, if two EPEs each import 50 MW from a
renewable facility in hour ending 16 (HE16), but the HE16 meter data
shows that the facility only produced 80 MW in that hour, how much
substitute electricity must each EPE report?
The practice of allocating the commercial energy output from a renewable generation
resource is an industry practice not addressed by MRR. Table 4 below provides an
example to show how much substitute electricity must be reported by each EPE in this
scenario. For this example, we assume that each EPE receives a contractually based
percentage of output from the facility, which is an eligible renewable energy resource in
California. Each EPE would report substitute power calculated in Column F based on
their respective shares of the meter data output. EPE 1 would report 18 MW as
unspecified and EPE 2 would report 2 MW as unspecified.
Table 4: Meter Data Shared Output Example
Illustration for One Hour of Generation Scheduled and Delivered
Description
Tagged
in HE16
(MW)
Metered
Output
in HE16
(MW)
Share of
Metered
Output
(%)
Share of
Metered
Output
(MW)
Reportable Substitute
Power
(MW)
(A)
(B)
(C)
(D)
(E)=(C*D)
(F)=(B-E)
EPE 1
50
80
40%
32
18
EPE 2
50
80
60%
48
2
3 Qualified Export Adjustment (Obsolete)
The 2016 MRR and Cap-and-Trade Regulation removed the QE adjustment effective
for the third compliance period, which began in 2018.
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 20 April 11, 2024
4 Renewable Electricity and Renewable Energy Credits
This section describes the requirements for renewable energy and renewable energy
credits (REC) under MRR and the Cap-and-Trade Regulation.
4.1 Renewable Energy Credits
The following FAQs address questions related to RECs, including how the term
“renewable energy credit” is defined in MRR and the Cap-and-Trade Regulation and
how RECs are created.
4.1.1 How has CARB defined the term “renewable energy credit” in MRR?
In MRR section 95102(a), the term “Renewable Energy Credit” or “REC” is defined as
having the same meaning as defined in the CEC “Renewables Portfolio Standard
Eligibility,” 7th edition, Commission Guidebook, April 2013; CEC-300‐2013‐005‐ED7‐
CMF. The CEC guidebook is posted online at
https://ww2.energy.ca.gov/publications/displayOneReport_cms.php?pubNum=CEC-
300-2013-005-ED7-CMF
4.1.2 Is there a substantive difference between how MRR and the Cap-and-
Trade Regulation define “renewable energy credit?”
No. The same definition of “renewable energy credit” or “REC” is used in both
regulations. RECs may be created for electricity generating facilities located inside or
outside of California.
4.1.3 How are California RPS RECs created?
California RPS RECs (California RECs) are created by the Western Renewable Energy
Generation Information System (WREGIS) when electricity is generated by a California
“eligible renewable energy resource” which is defined in both the Cap-and-Trade
Regulation and MRR as having “the same meaning as defined in Section 399.12 of the
Public Utilities Code.” Public Utilities Code 399.12(e) sets forth detailed requirements for
these resources.
4.1.4 How do I know if a specific resource is considered to be a California RPS
eligible renewable energy resource under MRR?
CEC maintains a list of eligible renewable energy resources that are compliant with the
requirements of Public Utilities Code 399.12, and the CEC has certified these as
California RPS eligible facilities at: https://rps.energy.ca.gov. To view the public list, click
on the “Facility Search” button in the lower right corner of the webpage. Then, on the
next Search Options webpage, click on the “Excel” or “CSV” button in the lower right
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 21 April 11, 2024
corner. The Excel and CSV files contain more data fields than are displayed on the
search options webpage.
A specific resource (facility) is listed as a California RPS eligible renewable energy
resource in ONE, if the following criteria are met using the Excel or CSV file:
• Certification Type: Any type other than “Pre-Certification;”
• Eligibility Date: A date on or before the power generation date of the energy
being reported;
• Certification Status: Must be “Approved.” Note that the certification status alone
does not determine the eligibility of a facility.
Note the advisory column in ONE for RPS eligible facilities does not prevent the reporter
from listing in their report that a given facility is RPS eligible. However, where the
advisory column and the user-selected eligibility status differ, reporters should be
prepared to provide additional evidence to their verifier to support the user-selected
eligibility status.
4.1.5 Am I required to report serial numbers for RECs that are created for an
electricity generating facility that is not a California Eligible Renewable
Energy Resource?
No. If an electricity generating facility is not a California eligible renewable energy
resource, i.e., the resource is not listed by CEC in the link above, no RECs recognized
for RPS compliance in California are created, so RECs are not required to be reported.
RPS adjustments for ineligible facilities are not allowed and claiming RPS adjustments
for ineligible facilities is considered a correctable error in the emissions data report. If
not corrected, the verifier would be required to issue an adverse verification statement
pursuant to section 95131(b)(9) of MRR.
4.2 REC Requirements for Specified Source Imports
The following FAQs address questions related to the reporting requirements of RECs
for specified source imports.
4.2.1 Do I need to retire RECs from specified source imports of renewable
electricity that meet the direct delivery requirements?
RECs do not need to be retired for specified source imports; however, REC serial
numbers associated with the imported power must be reported, if applicable, pursuant
to section 95111(g)(1)(M) of MRR.
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 22 April 11, 2024
4.2.2 Can REC serial numbers be under/over reported relative to MWh
imported from eligible renewable resources?
No. MRR requires that importers of electricity to California report “RECs associated with
electricity generated, directly delivered, and reported as specified imported electricity
…” per section 95111(g)(1)(M)(3) of MRR. Under reporting of REC serial numbers,
which also includes the omission of REC serial numbers, as well as over reporting of
REC serial numbers relative to the amount of imported power does not meet the
requirement to report RECs “associated with electricity generated, directly delivered,
and reported as specified imported electricity.” Accordingly, reporting REC serial
numbers that are not associated with the imported electricity, or that do not match the
imported electric power for which the RECs are claimed, does not meet the REC
reporting requirement, and would result in a nonconformance. This nonconformance
would not affect emissions and would therefore lead to a qualified positive verification
statement, absent other issues. The EPE would still be required to use the specified
source emission factor to report the specified import.
4.2.3 For specified electricity imported on behalf of a retail provider, is the first
deliverer required to report REC serial numbers?
Yes, the first deliverer is required to report REC serial numbers associated with the
imported power. The reporting and compliance obligation applies to the first deliverer of
electricity imported to California.
4.2.4 Are there any requirements related to RECs for imported ACS power?
No. EPEs are not required to report REC serial numbers for specified imported
electricity from an ACS’s system. ACS power is not on the list of CEC’s eligible
renewable energy resources and thus, by definition, does not produce California RPS-
eligible RECs.
5 Reporting Sales into CAISO Markets
The following FAQs address questions related to reporting sales into CAISO markets,
including to which entities the requirements apply.
5.1 Who must report sales into CAISO markets?
Each publicly owned utility (POU) or electrical cooperative (co-op) that receives
electrical distribution utility allocated allowances must report all sales into CAISO
markets for which it has a compliance obligation if it deposited allocated allowances into
its compliance account or the compliance account of a generator or electric power entity
pursuant to section 95892(b)(2) of the Cap-and-Trade Regulation. Reporting of these
data is done in the “CAISO Sales” worksheet in ONE.
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 23 April 11, 2024
To help EPEs determine whether they must report CAISO sales, staff have developed a
series of questions for EPEs to answer. The answers to the following questions
determine whether an EPE is required to report sales into CAISO markets under
section 95111(a)(12) of MRR. All EPEs must answer question 1. EPEs who respond
affirmatively to question 1 must also answer questions 2 through 5. Affirmative answers
to all five of the following questions would require an EPE to report CAISO sales:
1. Are you an electrical distribution utility other than an investor-owned utility (IOU)
(i.e., a POU or Co-op, or WAPA SNR)? If answering “No,” you are not required to
report CAISO sales and no additional information is required on this sheet.
2. Did you have any allocated allowances deposited in your compliance account, or
in another electric power entity’s (EPE) compliance account? Verifiers must
contact Cap-and-Trade Program staff at [email protected] to confirm
each EPE’s response to this question.
3. Did you sell any power into any CAISO markets during the last calendar year?
4. Do you, or an EPE to whom you allocated allowances, have a compliance
obligation under the Cap-and-Trade Regulation for emissions from electricity sold
into CAISO?
5. Was any electricity from any resource in your portfolio sold into CAISO markets
that ultimately served any non-native load?
5.2 Why must POUs and co-ops report CAISO sales?
Section 95892(d)(7)(A) of the Cap-and-Trade Regulation prohibits the use of allocated
allowance value for sales into CAISO markets. CARB staff will consider the amount of
sales into CAISO markets reported and the number of allowances needed to account
for those sales to determine if a POU or co-op has purchased enough allowances,
separate from those allocated, to cover the CAISO sales.
5.3 Does an EPE still have to report, even if it didn’t sell any power into
CAISO markets?
All EPEs must respond to the questions. The answers to these questions will determine
whether an EPE must report sales of electricity into CAISO markets.
5.4 What constitutes a sale into CAISO markets under section 95111(a)(12)?
CAISO sales means electricity that is sold into CAISO markets, including but not limited
to, the day-ahead market, real time market, and energy imbalance market. Transactions
excluded, pursuant to section 11.29(a)(iii) of the CAISO Fifth Replacement Tariff
dated May 1, 2014 do not constitute CAISO Sales. For purposes of compliance with
MRR, electricity procured by a POU or co-op from any source that does not ultimately
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 24 April 11, 2024
serve native load is electricity that is considered “CAISO Sales” under
section 95111(a)(12), for those POUs or co-ops that have a compliance obligation.
More specifically:
1. Excess electricity that does not serve the utility’s native load is reportable as
CAISO sales, even if the generation resource causing the excess electricity is
funded by municipal tax-exempt debt.
2. The determination of excess electricity must be made on an hourly (or interval)
basis using hourly (interval) resource specific generation data and hourly
(interval) gross load, as applicable.
3. Netting of electricity across or within hours (or intervals) is not allowed in the
calculation of reportable CAISO sales. I.e., excess electricity sold into the CAISO
markets in one hour (or interval) cannot be netted against the electricity bought
from any CAISO market in another hour (or interval).
5.5 What is an Electrical Distribution Utility (EDU) compliance obligation
under section 95111(a)(12)?
The compliance obligation under section 95111(a)(12) is a Cap-and-Trade Regulation
compliance obligation. For the purposes of reporting CAISO sales, the EDU is
considered to have a compliance obligation in the following scenarios:
• Electricity imported into California by the EDU; reported pursuant to
section 95111;
• Electricity from an in-State generation facility operated or owned by the EDU;
• Electricity from a generating facility into whose compliance account the EDU
directed CARB to deposit allocated allowances; or
• Electricity from a power pool which consists, in whole or in part, of electricity for
which the EDU has a compliance obligation, as described in this FAQ.
5.6 How does a POU or co-op report sales into CAISO markets?
A POU or co-op that is not a “retail sales only” reporter must report sales into CAISO
markets on the “CAISO Sales” tab of ONE. POUs and co-ops must report MWh sold
into CAISO by source of generation (facility or unit), if known, using the emission factor
for each source (if known), and should include in the report the CARB ID number for the
facility or source. Any sales into CAISO not reported by source must be reported as
sales from an unknown source. Retail providers that report only retail sales and have no
reportable CAISO sales under section 95111(a)(12), or imports or exports, may report
using the EPE overview webpage directly in Cal e-GGRT.
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 25 April 11, 2024
5.7 Which emission factors should an EDU use to report CAISO sales under
section 95111(a)(12)?
Out-of-State Specified Sources: When power is imported under section 95111 from a
specified source and sold into CAISO markets, the generation source must be
registered with CARB pursuant to 95111(g) and reported using a specified source
emission factor calculated by CARB as posted in ONE. If the generation source is
registered with CARB it will appear in the drop-down menu in Column A of the “CAISO
Sales” tab of ONE. The relevant facility information and emission factor calculated by
CARB will automatically populate in subsequent columns.
In-State Specified Sources: For resources for which the EDU is the GPE or has access
to the emissions and electricity production, the EDU must calculate an emission factor
associated with those sales. This calculation is subject to verifier review for
conformance. Verifiers are expected to understand the calculation methodologies and
data sources used to calculate the emission factor and determine that the calculation
was reasonable. If the verifier determines the calculation of the emission factor is
incorrect or unreasonable, the EPE must make changes to address the verifier’s finding,
or may choose “Unknown – CAISO Sales” from the facility drop-down list in Column A
of the “CAISO Sales” tab of ONE for sales from that source. Similarly, in cases where
the EPE does not have access to sufficient data to calculate an emission factor for an
in-State specified source, the EPE must chose the “Unknown – CAISO Sales” option.
Unknown or Unspecified Sources (e.g., market purchases): When imported electricity
meets the requirements for unspecified electricity under MRR and is sold into CAISO
markets, the EDU must choose “Unspecified – CAISO Sales” from the facility drop-
down list in Column A of the “CAISO Sales’ tab of ONE. This will result in an emission
factor of 0.428 MT CO₂e/MWh for unspecified electricity, pursuant to
section 95111(b)(1).
Likewise, if the generation source is unknown the EDU must report using the default
emission factor of 0.428 MT CO₂e/MWh for unspecified electricity, pursuant to
section 95111(b)(1). The EDU must choose “Unknown – CAISO Sales” from the facility
drop-down list in Column A of the “CAISO Sales” tab of ONE.
5.8 When should an EDU use a system emission factor, that is not listed in
ONE, to report CAISO sales under section 95111(a)(12)?
If an EDU has sales into CAISO markets that cannot be attributed to a specific source,
but are from the EDU’s system, an EDU may calculate and use a system emission
factor. The system emission factor is the total emissions divided by total net generation
for all facilities and purchases in the EDU’s system or portfolio. This calculation is
subject to verifier review for conformance. Verifiers are expected to understand the
calculation methodologies and data sources used to calculate the emission factor and
determine that the calculation was reasonable. If the verifier determines the calculation
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 26 April 11, 2024
of the emission factor is incorrect or unreasonable, the EPE must make changes to
address the verifier’s finding, or may choose “Unknown – CAISO Sales” from the facility
drop-down list in Column A of the “CAISO Sales” tab of ONE for sales from that source
or system.
6 CAISO Energy Imbalance Market (EIM)
The following FAQs address questions related to reporting imports from the CAISO
Energy Imbalance Market (EIM).
6.1 Are EPEs required to report EIM imports and exports under MRR?
Yes, the definition of imported electricity in section 95102(a) includes dispatches
designated by the CAISO EIM optimization model and reported by CAISO to EIM
Participating Resource Scheduling Coordinators as electricity imported to serve retail
customer load located within the State of California. Similarly, the definition of electricity
exporter includes exports from California associated with EIM, in the event that future
model enhancements identify resource specific exports.
6.2 What CAISO settlement data should be used when reporting EIM
imports?
CAISO may periodically update settlement data for up to 36 months after the trade date.
When reporting EIM specified imports, EPEs should use the most current CAISO
settlement data available. In order to meet the June 1 deadline, EPEs should report
using updated settlement data available as of April 30 or later. During verification, that
data should be updated to reflect settlement data as of July 1. This means the reported
data will include some T+18 month, some T+9 month and some T+55 day settlement
data.
6.3 Are EIM imports subject to the Lesser of Analysis (LOA)?
Yes, EIM Imports are now subject to the Lesser of Analysis (LOA). The LOA applies to
imports with an emission factor of zero and to imports from California Renewable
Portfolio Standard (RPS) eligible resources. EIM was previously excluded from LOA
under 2014 MRR but is now included under 2016 MRR. See also FAQ 2.2.3 above for
more information.
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 27 April 11, 2024
6.4 For CY2019 Only [Obsolete]
6.5 For CY2019 Only [Obsolete]
6.6 How are EIM imports identified as an EIM Import in ONE in either the
Specified Imports or Unspecified Imports tab?
In ONE in the Specified and Unspecified Imports tabs, the “E-Tagged, Metered, or
EIM?” field is used to flag imports as either tagged, metered, or EIM. When reporting
EIM imports, select “EIM” in this field, then identify whether they took place in Q1 or in
Q2 through Q4 for specified imports.
6.7 Should EIM imports reported as result of the Lesser of Analysis be
reported as “EIM” or “Metered” in the “E-Tagged, Metered, or EIM?” field
in ONE?
EIM imports reported as a result of the Lesser of Analysis must be reported as “EIM” in
the “E-Tagged, Metered, or EIM” field in the Specified Imports tab of ONE. EIM imports
are subject to the lesser of analysis as described in FAQ 6.3. Even though the EIM
imports reported in the Specified Imports tab of ONE are based on the metered output
of the generation source, the mechanism by which those MWh were imported to
California was via EIM, not via metered transmission line quantities.
7 Reporting Retail Sales of Electricity
The following FAQs address questions related to reporting retail sales of electricity that
serve California load.
7.1 Do EPEs have to report retail sales that serve California load?
Yes, EPEs that are retail providers under MRR are required to report retail sales for
each calendar year, even if they have zero retail sales to report, per
section 95101(h)(2)(D), although there are exceptions for Electric Service Providers
(ESP) as described below. Additional requirements for retail providers are set forth in
sections 95111(c) and 95111(h)(2)(B). Retail sales are reported in MWh.
7.2 What constitutes “retail sales of electricity” under MRR?
“Retail sales” is defined as “electricity sold to retail end users,” under section 95102(a).
For investor-owned utilities, this should include both bundled and unbundled retail sales.
All EPEs that are EIM Purchasers are required to verify annual retail sales pursuant to
sections 95111(c) and 95111(h)(2)(B).
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 28 April 11, 2024
For purposes of reporting retail sales under MRR, the requirement is to report a single
annual retail sales figure in MWh. In order to verify the accuracy of the reported figure,
the entity must provide substantiating documentation to the verifier demonstrating the
accuracy of the reported totals. CARB will contact EIM Purchasers that are “retail sales
only” reporters with directions about how to provide substantiating documentation.
In addition, pursuant to section 95111(h)(2)(B)(2), investor-owned utilities (IOUs) who
are EIM Purchasers, shall calculate, report and cause to be verified, the name(s) and
total California retail sales of each load-serving entity (community choice aggregator
and electric service provider) in its electrical distribution service territory. IOUs should
not include the retail sales totals of any publicly owned electric utilities they serve. IOUs
should make documentation demonstrating how those values were calculated, available
to verifiers to support the accuracy of the reported totals during the verification process.
To allow IOUs to report Unbundled Sales in Cal e‐GGRT, CARB staff will upload an
Unbundled Sales Reporting Template in Excel to each applicable IOU’s Cal e‐GGRT
account. Each template will contain the known list of each CCA and ESP in the
respective IOU service territories. For ease of reporting in the template, retail sales will
be reported in both kWh and MWh. After each template is completed, each applicable
IOU will upload the file as an additional attachment on the Electric Power Entity
Overview page in Cal e‐GGRT.
7.3 How should CPUC-registered electric service providers (ESP) report?
Electric Service Providers (ESP) are retail providers under MRR. Although registered
with the CPUC, some ESPs currently serve (or have served) California load via retail
sales, whereas some ESPs have never served California load. Pursuant to
section 95101(h)(2)(D), ESPs that have never provided retail electricity to California
customers are not required to report under MRR until they meet the definition of retail
provider, unless other MRR provisions are applicable (e.g., reportable imports). Thus,
an ESP that has served California retail load must report the quantity of retail sales
(MWh) served via Cal e‐GGRT, whereas ESPs that have never provided retail sales in
California are no longer required to report zero retail sales.
7.4 Can an EPE report retail sales for an affiliated ESP or community choice
aggregator (CCA)?
Pursuant to section 95101(h)(2)(D), each EPE must report its own retail sales (and
other applicable information) via Cal e‐GGRT. Separately, under 95111(h)(2)(B)(2),
IOUs who are EIM Purchasers, must report the total California retail sales of each load-
serving entity in its electrical distribution service territory.
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 29 April 11, 2024
8 Cessation of Reporting and Verification
The following FAQs address questions related to cessation of reporting, and/or
verification.
8.1 Imports and/or Exports: When an EPE stops importing and exporting
power, how much longer does the EPE have to report and verify?
Pursuant to section 95101(h)(1)(B) of 2018 MRR, EPEs with a compliance obligation
under the Cap-and-Trade regulation (i.e., having any imported MWh regardless of
emission factor for any year of the compliance period 2018-2020), EPEs are required to
continue to submit an emissions data report until the entity has no reportable imports for
an entire subsequent compliance period (e.g., through the end of the 2021-2023
compliance period, even if imports cease during the 2018-2020 compliance period).
Regarding verification, this subpart states that, “Electric power entities that no longer
import or export electricity must verify their emissions data report in the first year in
which they report zero imports or exports. Any reporting year thereafter with zero
imports or exports is not subject to verification.”
If the EPE previously did not have a compliance obligation under the Cap-and-Trade
regulation (e.g., only reported exports), then it must continue to report zero imports and
exports for three consecutive years pursuant to section 95101(h)(2)(C). Verification for
reporting when such consecutive zero exports are reported is not required, pursuant to
section 95101(h)(2)(C). See Table 5 for a summary of Cessation requirements for
reporting and verification below.
Table 5: Cessation of Reporting & Verification in MRR 2018
Imports
EPE with any MWh imports, regardless of emission factor, must continue to
submit an emissions data report until the entity has no reportable imports for an
entire subsequent compliance period, even if imports cease during the 2018-
2020 compliance period.
Exports
Only
EPE must continue to report zero exports (and no imports) for three consecutive
years pursuant to section 95101(h)(2)(C).
Wheels
Only
An EPE with wheels only is not required to report or verify, because EPEs are
defined as only importers and exporters.
Verification
Electric power entities that no longer import or export electricity must verify their
emissions data report in the first year in which they report zero imports or
exports. Any reporting year thereafter with zero imports or exports is not subject
to verification
Note that the EPE must notify CARB in writing of the reason(s) for cessation of reporting
pursuant to sections 95101(h)(1)(C) and 95101(h)(2)(E). EPEs that meet the definition
of retail provider must always report retail sales pursuant to section 95101(h)(2)(D).
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 30 April 11, 2024
8.2 The EPE I represent had ceased importing and exporting electricity in the
California market in 2020. When am I eligible to cease reporting and
verification?
If you ceased importing or exporting during calendar year 2018, 2019, or 2020, you
would follow the cessation requirements in 2018 MRR section 95101(h)(1). Pursuant to
section 95101(h)(1)(B) of the 2018 MRR, if you ceased importing and exporting
during 2020, you must report and verify calendar year (CY) 2020 emissions. Also, you
must report and verify for the first year in which you have zero imports or exports. For
example, if you imported 10,000 MWh from January through June 2020 and then
ceased operations in California in July 2020, you must report and verify for CY2020,
and also report and verify zero imports and exports for CY2021, thereby confirming
through verification that you have ceased operations. While any reporting year
thereafter with zero imports or exports is not subject to verification, you must report zero
imports or exports until your entity is no longer subject to a compliance obligation under
the Cap-and-Trade Regulation for an entire subsequent compliance period, which is
through data year 2022, assuming you had no imports or exports during that time.
8.3 Wheels: When an EPE only has “wheeled electricity through California”
to report, does the EPE have to report and verify?
If the EPE has reportable transactions of wheeled electricity, but does not have any
reportable imports or exports, then reporting and verification is not required.
Section 95111(a)(8) states that, “only an electric power entity as defined in
section 95102(a) must report wheeled electricity through California.” In
section 95101(d), electric power entities are identified as electricity importers and
exporters as defined in section 95102(a). Thus, an EPE with only wheels is not required
to report or verify.
9 Reporting Imports via Energy Storage Systems
The following FAQs address questions related to the reporting of imported power only,
originating from or passing through an energy storage system (ESS) for data years
2023 and 2024.
9.1 What constitutes an ESS?
The most common form of ESS are batteries; however, any system that can store
electric power generated at another source at one time for discharge at a later time is
considered an ESS.
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 31 April 11, 2024
9.2 How should imports from ESS sources be reported?
Imports originating from ESS sources (e.g., with ESS as the source on the e-Tag or via
metered lines) or passing through ESS sources (e.g., with the ESS as part of the
physical path of a single e-Tag) should be reported as per the current regulatory
requirements for specified and unspecified imports. MRR requirements of a contract,
and as applicable seller warranties along the entire transmission path, must be met for
the electricity to be claimed as specified from the generation source.
Specified or unspecified imports that would normally be aggregated by the same
source/point-of-receipt (POR) should be reported in separate line items if a portion
passed through an ESS. I.e. one line item for the aggregated non-ESS MWh that do not
pass through the ESS, and separate line items aggregated by each unique ESS.
In addition, reporters should contact CARB in advance of the June 1 reporting deadline
if they intend to report any power originating from or passing through an ESS. CARB will
unlock an additional reporting column in the import tabs of the relevant EPE reporting
workbook to identify those lines items that have been imported via an ESS source.
9.3 How should imports with an ESS as the originating source be reported?
An ESS does not meet the MRR definition of a specified source of electricity, because
ESS do not themselves generate electricity to be procured to meet the “full or partial
ownership in the facility/unit or a written power contract to procure electricity generated
by that facility/unit” portion of the specified source definition in §95102(a). To report
electricity originating from or passing through an ESS as specified, the importer must
meet the current regulatory requirements for reporting specified electricity in
§95111(a)(4). That means that power contracts (with seller warranty as applicable), or a
dedicated hardwired connection from the ESS to a single upstream generation source is
needed to claim the power as specified.
9.4 Does power flowing through an ESS incur any additional losses that are
accounted for?
MRR does not currently specify additional losses, besides transmission losses, for
power flowing through an ESS that need to be accounted.
9.5 How should power subject to the Meter Data Requirement of
§95111(b)(2)(E) (lesser of analysis) be reported?
Because ESS power deliveries are offset from the time of generation, comparing ESS
e-Tags or metered deliveries from the ESS, to metered generation data is neither
accurate nor feasible. Specified power from sources subject to §95111(b)(2)(E) passing
through an ESS are not subject to the lesser of requirement.
Guidance for California’s Mandatory Greenhouse Gas Emissions Reporting
California Air Resources Board 32 April 11, 2024
10 Additional Information
The GHG Mandatory Reporting Regulation, with full requirements:
https://ww2.arb.ca.gov/mrr-regulation.
For more information regarding Electric Power Entities in the GHG Mandatory Reporting
Regulation: https://ww2.arb.ca.gov/mrr-epe.
Contact the MRR helpdesk: [email protected].
For help with reporting or verification, please contact the appropriate staff member:
https://ww2.arb.ca.gov/mrr-contacts.