SPSO eGRID Subregion - SPP South Emission Factor (2023)

EPA eGRID2023 Rev2 · States: OK, TX, LA, AR, NM, MO, KS · Dirty

SPSO (SPP South) covers ZIP codes in OK (56%), TX (16%), LA (14%), AR (6%), NM (4%), MO (2%), KS (1%), by share of its ZIP codes. Its largest generation sources in 2023 were gas 46%, wind 33%, coal 16%. This page gives the official EPA eGRID2023 emission factors for SPSO, used for GHG Protocol Scope 2 location-based reporting.

Emission Factors

875.567

lb CO₂e / MWh

0.3972

kg CO₂e / kWh

36.74%

Carbon-free

36.74%

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	Avoided-emissions estimates (not Scope 2)

Generation Mix

Wind32.5%

Hydro2.5%

Natural Gas46.1%

Coal16.3%

Biomass1.2%

Oil0.5%

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.

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.

Subregions Serving the Same States

AZNM - WECC Southwest ERCT - ERCOT All NWPP - WECC Northwest SPNO - SPP North

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?

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

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

Read the API docs · Scope 2 guide