SRMW eGRID Subregion - SERC Midwest Emission Factor (2023)

EPA eGRID2023 Rev2 · States: MO, IL, IA, KS · Very Dirty

Midwest portion of SERC spanning Missouri and Illinois, served by MISO. This page provides the official EPA eGRID2023 electricity emission factors for the SRMW subregion, used for GHG Protocol Scope 2 location-based emissions reporting.

Emission Factors

1248.582

lb CO₂e / MWh

0.5663

kg CO₂e / kWh

31.6%

Carbon-free

15.2%

Renewable

The SRMW subregion is 62% dirtier than the US average (770.9 lb CO₂e/MWh).

All Pollutants

Pollutant	lb / MWh	kg / kWh	Scope
CO₂e (total GHG)	1248.582	0.5663	Scope 2
CO₂	1239.839	0.5624	Scope 2
CH₄ (methane)	0.132	0.00005987	Scope 2
N₂O (nitrous oxide)	0.019	0.00000862	Scope 2
NO_x	0.787	0.00035698	Air quality
SO₂	1.636	0.00074208	Air quality
CO₂ non-baseload	1818.554	0.8249	Scope 2 (marginal)

Generation Mix

Solar1.6%

Wind12.5%

Nuclear16.4%

Hydro0.9%

Natural Gas16.9%

Coal51.1%

kWh to CO₂ Calculator

Enter electricity consumption (kWh):

Using SRMW emission factor: 1248.582 lb CO₂e/MWh = 0.5663 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: 1248.582 lb/MWh or 0.5663 kg/kWh.

Primary utility: Ameren Missouri

Get This Data via API

Query SRMW emission factors by ZIP code:

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

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

Neighboring Subregions

MROW - MRO West RFCW - RFC West SPNO - SPP North SRMV - SERC Mississippi Valley

Frequently Asked Questions

What is the SRMW emission factor for Scope 2 reporting?

The SRMW eGRID2023 Scope 2 location-based emission factor is 1248.582 lb CO₂e per MWh (0.5663 kg CO₂e per kWh). This is the value to use in GHG Protocol location-based Scope 2 calculations for facilities in the SERC Midwest subregion.

Which states are in the SRMW subregion?

The SRMW (SERC Midwest) eGRID subregion covers: MO, IL, IA, KS. Midwest portion of SERC spanning Missouri and Illinois, served by MISO.

How do I convert kWh to kg CO₂e for SRMW?

Multiply kWh by 0.5663. Example: 50,000 kWh × 0.5663 = 28315 kg CO₂e (28.32 tonnes).

Query any US ZIP code via API

33,616 ZIP codes · All 27 eGRID subregions · EPA eGRID2023 + 2024 preliminary

Read the API docs · Scope 2 guide