Tunnel
Hydro power plant in New London County, Connecticut. 2 MW of nameplate capacity across 2 generators, operated by FirstLight Power Resources Services LLC.
Also known as EIA plant 557
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 2 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- January 1919First generator online
- Operator
- FirstLight Power Resources Services LLCEIA operator ID 54895
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- 1 ISONE nodeResource nodes with prices
- Location
- New London County, CT41.5554, −72.0418
- EIA plant ID
- 557EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Tunnel produces
Free · EIA-923Net generation, 2025
5.93 GWh
5,929 MWh, final
Capacity factor, 2025
3.3%
2024: 4.3%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
5.6–11.9
GWh a year. Low 2015, high 2023
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 9,316 | Not reported | 12 of 12 |
| 2001 | 6,454 | Not reported | 12 of 12 |
| 2002 | 6,194 | Not reported | 12 of 12 |
| 2003 | 9,138 | Not reported | 10 of 12 |
| 2004 | 9,485 | Not reported | 12 of 12 |
| 2005 | 12,210 | Not reported | 12 of 12 |
| 2006 | 9,055 | Not reported | 12 of 12 |
| 2007 | 6,750 | Not reported | 12 of 12 |
| 2008 | 10,933 | Not reported | 12 of 12 |
| 2009 | 11,398 | Not reported | 12 of 12 |
| 2010 | 7,328 | 4.1% | 12 of 12 |
| 2011 | 12,821 | 7.1% | 12 of 12 |
| 2012 | 7,415 | 4.1% | 12 of 12 |
| 2013 | 8,335 | 4.6% | 12 of 12 |
| 2014 | 7,727 | 4.3% | 12 of 12 |
| 2015 | 5,643 | 3.1% | 12 of 12 |
| 2016 | 6,106 | 3.4% | 12 of 12 |
| 2017 | 10,629 | 5.9% | 12 of 12 |
| 2018 | 10,974 | 6.1% | 12 of 12 |
| 2019 | 9,404 | 5.2% | 12 of 12 |
| 2020 | 8,497 | 4.7% | 12 of 12 |
| 2021 | 11,186 | 6.2% | 12 of 12 |
| 2022 | 7,298 | 4.1% | 12 of 12 |
| 2023 | 11,898 | 6.6% | 12 of 12 |
| 2024 | 7,722 | 4.3% | 12 of 12 |
| 2025 | 5,929 | 3.3% | 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, 2023
Not reported
US short tons. 2022: Not reported
SO₂, 2023
Not reported
US short tons
NOx, 2023
1
US short tons
0 of 1 EPA units reported CO₂ in 2023 (10), matched to EIA plant 557 through the EPA–EIA crosswalk.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1 | Conventional Hydroelectric | 1.0 | January 1919 |
| 2 | Conventional Hydroelectric | 1.0 | January 1949 |
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 FirstLight Power Resources Services LLC as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Power plants near Tunnel
More plants operated by FirstLight Power Resources Services LLC
Questions about Tunnel
How much power does Tunnel produce?
Tunnel reported 5,929 MWh (5.93 GWh) of net generation in 2025, a 3.3% capacity factor on 2 MW of nameplate capacity.
Where is Tunnel?
Tunnel is in New London County, Connecticut, at 41.5554, −72.0418. It is in the ISO New England Inc. balancing area (ISNE).
Who operates Tunnel?
EIA-860M for August 2026 lists FirstLight Power Resources Services LLC as the operator (EIA operator ID 54895). The operator is not always the owner.
When did Tunnel start operating?
Its first generator began operating in January 1919, according to EIA-860M.
Does InfraMap have power prices for Tunnel?
Yes. InfraMap has ISONE day-ahead and real-time prices at 1 price node linked to Tunnel, 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
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page