Methodologies

Credit: UNFCCC

What are methodologies, standardized baselines and methodological tools?

Methodologies, standardized baselines, and methodological tools form the framework for achieving emission reductions and removals consistent with the goals of the Paris Agreement.

Approved Mechanism Methodologies

Symbol number	Title	Sector scope(s)
A6.4-AMM-001	Flaring or use of landfill gas	1 & 13

Approved Methodological Tools

Symbol number	Title
A6.4-AMT-001	Common practice analysis
A6.4-AMT-002	Investment analysis
A6.4-AMT-003	Emissions from solid waste disposal sites
A6.4-AMT-004	Project emissions from flaring
A6.4-AMT-005	Mass flow of a greenhouse gas in a gaseous stream

Developing methodologies and methodological tools

At its 18^th meeting, the Supervisory Body approved the development of the following methodological products as contained in the Preliminary 2026 workplan.

Work related to	Products
Requirements for methodologies	Standard: Setting the baseline in mechanism methodologies Standard: Demonstration of additionality in mechanism methodologies Tool: Investment analysis Tool: Lock-in risk analysis Standard: Addressing leakage in mechanism methodologies Concept note: Large scale crediting Programmes Concept note: Taking account of policies and measures, and relevant circumstances Concept note: Transboundary activities Simplified approaches for additionality (upon request) Concept note: Possible exceptions to the application of paragraph 43(b) of the methodologies standard Concept note: Potential issues arising from the funding of Article 6.4 activities Concept note: Exploration on if and how methodology proponents may demonstrate further alignment with the temperature goal of the Paris Agreement
Removals	Concept note: Options for the implementation of paragraph 62 of the “Standard: Requirements for activities involving removals under the Article 6.4 mechanism” Tool: Reversal risk assessment
Revision of CDM methodologies/methodological tools/Standard/Guidelines	ACM0002: Grid connected electricity generation from renewable sources AMS-I.D.: Grid connected renewable electricity generation AMS-I.C.: Thermal energy production with or without electricity AMS-II.G.: Energy efficiency measures in thermal applications of non-renewable biomass; AMS-I.E: Switch from non-renewable biomass for thermal applications by the user Tool to calculate emission factor for an electricity system Tool to calculate project or leakage CO2 emissions from fossil fuel combustion Tool for Baseline, project and/or leakage emissions from electricity consumption and monitoring of electricity generation Tool for Project and leakage emissions from biomass Tool to calculate remaining lifetime of equipment Tool for Determining the baseline efficiency of thermal or electric energy generation systems Tool on Project and leakage emissions from transportation of freight Tool for Calculation of the fraction of non-renewable biomass Standard: Sampling and Surveys for CDM project activities and programmes of activities Guidelines: Sampling and Surveys for CDM project activities and programmes of activities Methodological tool: Default values for common parameter

To submit a proposal for a new methodology or methodological tool for approval under the A6.4 mechanism, follow the official submission process outlined in the Procedure for the development, revision and clarification of methodologies and methodological tools.

Below, you will find overview information on:

Who can submit a new methodology or methodological tool

Activity participants of a planned project
Coordinating/managing entities of a planned programme of activity (PoA)
Host Parties
Designated Operational Entities
Any other stakeholders

Required documents

To submit your proposal, please complete the following documentation:

A6.4-FORM-METH-001. New baseline and monitoring methodology or methodological tool proposal form: Word | PDF
A6.4-FORM-METH-002. Proposed new methodology or methodological tool form: Word | PDF
A6.4-FORM-AC-020. Project design document (PDD) form for planned projects: Word | PDF or

A6.4-FORM-AC-041. Programme of Activities design document (PoA-DD) form for planned PoAs: Word | PDF

When to submit the required documents

The deadlines for submission to propose new methodologies/methodological tools in 2025 are determined by the dates of the MEP meetings.

The upcoming submission deadline is:

MEP meeting	Submission deadlines	Information in relation to the submission deadlines
MEP 010	Monday 6 October 2025 (23:59 CEST)	Eight weeks prior to MEP 010 (1 to 5 December 2025)
MEP 011	Monday 1 December 2025 (23:59 CEST)	Eight weeks prior to MEP 011 (26 to 30 January 2026)

How submissions will be assessed

The proposed new methodologies and methodological tools will undergo a completeness check and an initial assessment in line with the Procedure: Development, revision and clarification of methodologies and methodological tools. If, following these steps, the submissions are deemed eligible for consideration, they will be uploaded to the dedicated webpage and subsequently reviewed by the Methodological Expert Panel at its meetings, as set forth in the aforementioned procedure.

Where to submit

Send all required documents and forms, specific inquiries or request for additional information to: A6.4mechanism-meth@unfccc.int.

Proposed New Methodologies

Below is an overview of proposed new methodologies currently under consideration.

Click on the title of each proposed new methodology to access detailed information.

Note: Use the form: A6.4-FORM-METH-007 (Word | PDF) to submit your input during the public consultation phase and send it via email to A6.4mechanism-meth@unfccc.int .

Ref. number	Title	Type of mitigation activity	Status of submission
A6.4-PNM004	Comprehensive Lowered Emission Assessment and Reporting (CLEAR) Methodology for Cooking Energy Transitions	Emission reductions activity	28 August 2025: Clarifications received from proponent
A6.4-PNM003	Pumped Hydro Storage and Supply of Electricity to the Grid	Emission reductions activity	29 August 2025: Clarifications received from proponent
A6.4-PNM002	N2O abatement from nitric acid production	Emission reductions activity	25 August 2025: Clarifications received from proponent
A6.4-PNM001	Production of Ammonia through electrolysis of water, air separation and synthesis of hydrogen and nitrogen	Emission reductions activity	27 August 2025: Clarifications received from proponent