Wallingford Energy
Natural gas power plant in New Haven County, Connecticut. 350 MW of nameplate capacity across 7 generators, operated by Wallingford Energy LLC.
Also known as Wallingford Energy Power Plant · EIA plant 55517
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Key facts
- Capacity
- 350 MWNameplate
- Generators
- 7 operatingEIA-860M, August 2026
- Operating since
- August 2001First generator online
- Operator
- Wallingford Energy LLCEIA operator ID 56927
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- 7 ISONE nodesResource nodes with prices
- Location
- New Haven County, CT41.4487, −72.8354
- EIA plant ID
- 55517EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Wallingford Energy produces
Free · EIA-923Net generation, 2025
107 GWh
106,980 MWh, final
Capacity factor, 2025
3.5%
2024: 2.9%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
78.2–205.9
GWh a year. Low 2022, high 2016
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | 27,597 | Not reported | 5 of 12 |
| 2002 | 159,343 | Not reported | 12 of 12 |
| 2003 | 97,069 | Not reported | 12 of 12 |
| 2004 | 59,910 | Not reported | 12 of 12 |
| 2005 | 110,781 | Not reported | 12 of 12 |
| 2006 | 226,670 | Not reported | 12 of 12 |
| 2007 | 278,184 | Not reported | 12 of 12 |
| 2008 | 132,172 | Not reported | 12 of 12 |
| 2009 | 108,334 | Not reported | 12 of 12 |
| 2010 | 217,799 | 9.9% | 12 of 12 |
| 2011 | 183,464 | 8.4% | 12 of 12 |
| 2012 | 108,921 | 5.0% | 12 of 12 |
| 2013 | 51,111 | 2.3% | 12 of 12 |
| 2014 | 47,697 | 2.2% | 12 of 12 |
| 2015 | 142,590 | 6.5% | 12 of 12 |
| 2016 | 205,857 | 9.4% | 12 of 12 |
| 2017 | 154,742 | 7.1% | 12 of 12 |
| 2018 | 151,654 | Not reported | 12 of 12 |
| 2019 | 105,704 | 3.4% | 12 of 12 |
| 2020 | 158,937 | 5.2% | 12 of 12 |
| 2021 | 112,743 | 3.7% | 12 of 12 |
| 2022 | 78,187 | 2.6% | 12 of 12 |
| 2023 | 161,301 | 5.3% | 12 of 12 |
| 2024 | 87,775 | 2.9% | 12 of 12 |
| 2025 | 106,980 | 3.5% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free account · ISONEEmissions
Free · EPA CAMPDCO₂, 2025
66,003
US short tons. 2024: 53,555
SO₂, 2025
0
US short tons
NOx, 2025
6
US short tons
CO₂ per MWh, calculated
0.62 t
About 1,234 lb per MWh
7 of 7 EPA units reported CO₂ in 2025 (CT01, CT02, CT03, CT04, CT05, CT06, CT07), matched to EIA plant 55517 through the EPA–EIA crosswalk. The per-MWh rate is EPA CO₂ divided by EIA-923 net generation. The two reporting boundaries can differ.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| CTG1 | Natural Gas Fired Combustion Turbine | 50.0 | October 2001 |
| CTG2 | Natural Gas Fired Combustion Turbine | 50.0 | September 2001 |
| CTG3 | Natural Gas Fired Combustion Turbine | 50.0 | August 2001 |
| CTG4 | Natural Gas Fired Combustion Turbine | 50.0 | August 2001 |
| CTG5 | Natural Gas Fired Combustion Turbine | 50.0 | August 2001 |
| CTG6 | Natural Gas Fired Combustion Turbine | 50.0 | May 2018 |
| CTG7 | Natural Gas Fired Combustion Turbine | 50.0 | May 2018 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Wallingford Energy LLC as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Questions about Wallingford Energy
How much power does Wallingford Energy produce?
Wallingford Energy reported 106,980 MWh (107 GWh) of net generation in 2025, a 3.5% capacity factor on 350 MW of nameplate capacity.
Where is Wallingford Energy?
Wallingford Energy is in New Haven County, Connecticut, at 41.4487, −72.8354. It is in the ISO New England Inc. balancing area (ISNE).
Who operates Wallingford Energy?
EIA-860M for August 2026 lists Wallingford Energy LLC as the operator (EIA operator ID 56927). The operator is not always the owner.
When did Wallingford Energy start operating?
Its first generator began operating in August 2001, according to EIA-860M.
Does InfraMap have power prices for Wallingford Energy?
Yes. InfraMap has ISONE day-ahead and real-time prices at 7 price nodes linked to Wallingford Energy, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- EPA CAMPD annual emissions through the EPA–EIA crosswalk, 1995 to 2025
- ISONE day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page