?year=2024. Read the API docs.
The EPA normally publishes eGRID each January. As of April 2026, eGRID2024 is over a year late. If you're reporting 2024 Scope 2 emissions - and you might have to, given the SB 253 deadline on August 10 - the GHG Protocol says to match your emission factor year to your reporting year. But there are no official 2024 factors.
Except there are. The EPA open-sourced the entire eGRID pipeline on GitHub under MIT. The 2024 input data from EIA and EPA CAMD is public. Cornerstone Data ran the code, validated it against the official 2023 release (<1% discrepancy), and published the results on Zenodo under CC-BY-4.0.
We ingested that data. You can now query preliminary eGRID2024 factors for any US ZIP code:
curl "https://emission-factors.com/api/lookup?zip=94105&year=2024"Without ?year=, you still get the official eGRID2023 Rev2. Nothing breaks.
data_status: "preliminary" and full source attribution. When the official release comes, we'll swap it in.
20 subregions got cleaner. 7 got dirtier. Sorted by largest decrease first.
| Subregion | 2023 | 2024 | Change | Carbon-free '24 |
|---|---|---|---|---|
| SPNO | 0.3936 | 0.3557 | ▼ 9.6% | 57.4% |
| NWPP | 0.2882 | 0.2642 | ▼ 8.3% | 59.9% |
| RMPA | 0.4729 | 0.4374 | ▼ 7.5% | 45.7% |
| MROE | 0.6373 | 0.5915 | ▼ 7.2% | 23.5% |
| SRMW | 0.5663 | 0.5257 | ▼ 7.2% | 35.8% |
| MROW | 0.4203 | 0.3941 | ▼ 6.2% | 53.9% |
| CAMX | 0.1950 | 0.1838 | ▼ 5.8% | 57.6% |
| AZNM | 0.3203 | 0.3031 | ▼ 5.4% | 42.5% |
| SRSO | 0.3837 | 0.3631 | ▼ 5.4% | 33.6% |
| AKMS | 0.2370 | 0.2248 | ▼ 5.1% | 68.6% |
| ERCT | 0.3341 | 0.3191 | ▼ 4.5% | 38.9% |
| HIMS | 0.5141 | 0.4959 | ▼ 3.5% | 37.8% |
| FRCC | 0.3560 | 0.3474 | ▼ 2.4% | 19.0% |
| RFCW | 0.4155 | 0.4056 | ▼ 2.4% | 36.4% |
| SPSO | 0.3972 | 0.3874 | ▼ 2.4% | 36.9% |
| SRMV | 0.3364 | 0.3323 | ▼ 1.2% | 27.2% |
| NYLI | 0.5395 | 0.5351 | ▼ 0.8% | 8.8% |
| HIOA | 0.6799 | 0.6749 | ▼ 0.7% | 14.2% |
| NEWE | 0.2464 | 0.2468 | ▲ 0.2% | 41.5% |
| RFCM | 0.4427 | 0.4483 | ▲ 1.3% | 21.0% |
| AKGD | 0.4106 | 0.4177 | ▲ 1.7% | 15.3% |
| NYCW | 0.3927 | 0.4012 | ▲ 2.2% | 0.6% |
| PRMS | 0.7024 | 0.7261 | ▲ 3.4% | 2.7% |
| RFCE | 0.2718 | 0.2817 | ▲ 3.7% | 40.1% |
| SRTV | 0.4097 | 0.4290 | ▲ 4.7% | 38.2% |
| SRVC | 0.2705 | 0.2906 | ▲ 7.4% | 47.5% |
| NYUP | 0.1101 | 0.1237 | ▲ 12.3% | 70.3% |
All values in kg CO₂e/kWh. Green = got cleaner (>3%). Red = got dirtier (>3%).
Wind is winning in the Plains. SPNO (▼9.6%) and MROW (▼6.2%) reflect continued wind buildout across Kansas, Nebraska, Iowa, and the Dakotas. SPP North's carbon-free share hit 57%.
Solar is pushing California further. CAMX (▼5.8%) saw solar jump from 20% to 23% of generation. The state is already one of the cleanest large grids at 0.184 kg/kWh.
Coal is declining almost everywhere. RMPA (▼7.5%), SRMW (▼7.2%), MROE (▼7.2%) - all coal-heavy regions that saw significant drops as plants retire or reduce output.
Nuclear variability matters. NYUP (▲12.3%) is still the cleanest subregion overall, but a likely nuclear plant outage or low hydro year pushed its rate up from 0.110 to 0.124. SRVC (▲7.4%) saw a similar nuclear-availability effect.
California's SB 253 requires companies with $1B+ annual revenue to report Scope 1 and 2 emissions. First deadline: August 10, 2026. Companies reporting on a 2024 fiscal year need 2024 emission factors. With the official eGRID2024 still MIA, these preliminary factors - generated from the EPA's own code - are the best available option.
Every response from our API includes the data source and status, so your methodology documentation is covered.
Query eGRID2023 (official) or eGRID2024 (preliminary) emission factors for any US ZIP code.
Free, no key, no signup. No paid tier.
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