SPSO eGRID Subregion - SPP South Emission Factor (2023)

EPA eGRID2023 Rev2 · States: TX, LA, AR, OK, MS · Dirty

Southern SPP covering Louisiana, Arkansas and parts of Texas and Oklahoma. This page provides the official EPA eGRID2023 electricity emission factors for the SPSO subregion, used for GHG Protocol Scope 2 location-based emissions reporting.

Emission Factors

875.567

lb CO₂e / MWh

0.3972

kg CO₂e / kWh

36.77%

Carbon-free

36.77%

Renewable

The SPSO subregion is 14% dirtier than the US average (770.9 lb CO₂e/MWh).

All Pollutants

Pollutant	lb / MWh	kg / kWh	Scope
CO₂e (total GHG)	875.567	0.3972	Scope 2
CO₂	872.042	0.3956	Scope 2
CH₄ (methane)	0.054	0.00002449	Scope 2
N₂O (nitrous oxide)	0.008	0.00000363	Scope 2
NO_x	0.673	0.00030527	Air quality
SO₂	0.658	0.00029846	Air quality
CO₂ non-baseload	1476.314	0.6696	Scope 2 (marginal)

Generation Mix

Wind32.6%

Hydro2.5%

Natural Gas46.2%

Coal16.2%

Biomass1.2%

kWh to CO₂ Calculator

Enter electricity consumption (kWh):

Using SPSO emission factor: 875.567 lb CO₂e/MWh = 0.3972 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: 875.567 lb/MWh or 0.3972 kg/kWh.

Primary utility: AEP Southwestern Electric Power Company (SWEPCO)

Get This Data via API

Query SPSO 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

AZNM - WECC Southwest ERCT - ERCOT SPNO - SPP North SRMV - SERC Mississippi Valley

Frequently Asked Questions

What is the SPSO emission factor for Scope 2 reporting?

The SPSO eGRID2023 Scope 2 location-based emission factor is 875.567 lb CO₂e per MWh (0.3972 kg CO₂e per kWh). This is the value to use in GHG Protocol location-based Scope 2 calculations for facilities in the SPP South subregion.

Which states are in the SPSO subregion?

The SPSO (SPP South) eGRID subregion covers: TX, LA, AR, OK, MS. Southern SPP covering Louisiana, Arkansas and parts of Texas and Oklahoma.

How do I convert kWh to kg CO₂e for SPSO?

Multiply kWh by 0.3972. Example: 50,000 kWh × 0.3972 = 19860 kg CO₂e (19.86 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