RMPA eGRID Subregion - WECC Rockies Emission Factor (2023)

EPA eGRID2023 Rev2 · States: CO, WY, NE, SD, MT · Very Dirty

RMPA (WECC Rockies) covers ZIP codes in CO (73%), WY (14%), NE (8%), SD (5%), MT (1%), by share of its ZIP codes. Its largest generation sources in 2023 were coal 32%, gas 26%, wind 26%. This page gives the official EPA eGRID2023 emission factors for RMPA, used for GHG Protocol Scope 2 location-based reporting.

Emission Factors

1042.539

lb CO₂e / MWh

0.4729

kg CO₂e / kWh

41.85%

Carbon-free

41.85%

Renewable

The RMPA subregion is 35% dirtier than the US average (770.9 lb CO₂e/MWh).

All Pollutants

Pollutant	lb / MWh	kg / kWh	Scope
CO₂e (total GHG)	1042.539	0.4729	Scope 2
CO₂	1036.601	0.4702	Scope 2
CH₄ (methane)	0.09	0.00004082	Scope 2
N₂O (nitrous oxide)	0.013	0.00000590	Scope 2
NO_x	0.526	0.00023859	Air quality
SO₂	0.329	0.00014923	Air quality
CO₂ non-baseload	1620.667	0.7351	Avoided-emissions estimates (not Scope 2)

Generation Mix

Solar5.4%

Wind25.8%

Hydro10.5%

Natural Gas26.4%

Coal31.7%

kWh to CO₂ Calculator

Enter electricity consumption (kWh):

Using RMPA emission factor: 1042.539 lb CO₂e/MWh = 0.4729 kg/kWh. Source: EPA eGRID2023.

Data Source & Methodology

These emission factors are from EPA eGRID2023 Rev2 (released June 2025), the official US government source for grid electricity emission rates. eGRID uses annual net generation and emissions data from all US power plants to calculate subregion-level output emission rates.

For GHG Protocol Scope 2 reporting, use the CO₂e total output emission rate: 1042.539 lb/MWh or 0.4729 kg/kWh.

Get This Data via API

Query RMPA emission factors by ZIP code:

curl "https://emission-factors.com/api/lookup?zip=YOUR_ZIP"

Read the API docs - free, no key, no signup.

Subregions Serving the Same States

MROW - MRO West NWPP - WECC Northwest

Frequently Asked Questions

What is the RMPA emission factor for Scope 2 reporting?

The RMPA eGRID2023 Scope 2 location-based emission factor is 1042.539 lb CO₂e per MWh (0.4729 kg CO₂e per kWh). This is the value to use in GHG Protocol location-based Scope 2 calculations for facilities in the WECC Rockies subregion.

Which states are in the RMPA subregion?

RMPA (WECC Rockies) covers ZIP codes in CO (73%), WY (14%), NE (8%), SD (5%), MT (1%), by share of its ZIP codes. Its largest generation sources in 2023 were coal 32%, gas 26%, wind 26%.

How do I convert kWh to kg CO₂e for RMPA?

Multiply kWh by 0.4729. Example: 50,000 kWh × 0.4729 = 23645 kg CO₂e (23.64 tonnes).

Query any US ZIP code via API

33,700+ ZIP codes · All 27 eGRID subregions · EPA eGRID2023 + eGRID2024 (Cornerstone)

Read the API docs · Scope 2 guide