Draft Amendment To The Methodological Tool For Calculating Emission Factors In Electricity Systems.pdf

Key Definitions:

Power Plant/Unit: A facility generating electric power, which can operate independently or as part of a larger complex.
Grid Power Plant/Unit: Supplies electricity to the national grid and/or specific consumers.
Off-grid Power Plant/Unit: Supplies electricity directly to specific consumers through dedicated distribution networks not connected to the grid. Strict criteria must be met for inclusion, including existing grid capacity and reliability impact.

Scope & Applicability:

The tool calculates the "combined margin" (CM) emission factor of an electricity system - a weighted average of "operating margin" (OM) and "build margin" (BM). It applies to projects substituting grid electricity or achieving demand-side energy efficiency.

Steps for Baseline Methodology:

1. Identify Relevant Electricity Systems: Define the project electricity system (PES), connected electricity systems (CES), and any relevant off-grid power plants based on physical connections, transmission constraints, and location (Annex I countries are excluded).

2. Choose Inclusion of Off-Grid Plants (Optional): Follow specific criteria for including off-grid plants in the PES:
Total capacity ≥ 10% of grid capacity
Annual generation ≥ 10% of grid generation
Generation constraints primarily due to generation, not transmission.

3. Select Operating Margin (OM) Method: Choose a method to determine the OM emission factor for the existing power plants affected by the project.

4. Calculate OM Emission Factor: Apply the chosen method to calculate the OM emission factor for the PES in each year of projection.

5. Identify Build Margin (BM) Group: Determine the group of prospective power plants that would be affected by the project's construction and operation.

6. Calculate BM Emission Factor: Calculate the BM emission factor for the PES based on the identified BM group.

7. Calculate Combined Margin (CM) Emission Factor: Compute the CM emission factor as a weighted average of OM and BM factors.

Output Parameters:

EFgrid,CM,y (tCO2/MWh): Combined margin CO2 emission factor for year y.
EFgrid,BM,y (tCO2/MWh): Build margin CO2 emission factor for year y.
* EFgrid,OM,y (tCO2/MWh): Operating margin CO2 emission factor for year y.