Westbrook Energy Center Power Plant
Cumberland County, Maine · EIA plant ID 55294 · Operator: Westbrook Energy Center
Nameplate564MWSummer 527 MW
Generators3in service
Net generation3,556GWh12 mo to Aug 2026
Capacity factor77%gas/coal/oil units, summer MW
Heat rate7,049Btu/kWhfossil units, electric fuel, HHV
First online2001Runs as baseload
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), gas/coal/oil units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 2,736.2 | — | — |
| 2002 | 3,932.7 | — | — |
| 2003 | 3,250.6 | 73.3% | 7,338 |
| 2004 | 3,430.6 | 77.2% | 7,350 |
| 2005 | 3,457.6 | 78.0% | 7,221 |
| 2006 | 3,219.5 | 72.6% | 7,222 |
| 2007 | 2,392.9 | 54.0% | 7,088 |
| 2008 | 2,698.6 | 60.7% | 7,262 |
| 2009 | 2,497.4 | 56.3% | 7,197 |
| 2010 | 2,689.2 | 60.7% | 7,151 |
| 2011 | 2,659.9 | 60.0% | 7,149 |
| 2012 | 2,446.1 | 55.0% | 7,162 |
| 2013 | 2,372.9 | 53.5% | 7,249 |
| 2014 | 1,838.9 | 41.5% | 7,129 |
| 2015 | 1,848 | 41.7% | 7,064 |
| 2016 | 2,183.1 | 49.1% | 7,024 |
| 2017 | 1,343.5 | 30.3% | 7,133 |
| 2018 | 1,488.1 | 31.4% | 7,674 |
| 2019 | 957.1 | 20.3% | 7,399 |
| 2020 | 1,011 | 21.5% | 7,293 |
| 2021 | 1,876.3 | 40.1% | 7,218 |
| 2022 | 2,461.7 | 52.6% | 7,230 |
| 2023 | 2,356.9 | 50.4% | 7,132 |
| 2024 | 3,022.4 | 65.3% | 7,019 |
| 2025 | 3,387.9 | 73.4% | 7,030 |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| GTG1 | Natural Gas Fired Combined Cycle | CT | 184.2 | 171.9 | May 2001 | Operating | — | coming soon |
| GTG2 | Natural Gas Fired Combined Cycle | CT | 184.2 | 173 | May 2001 | Operating | — | coming soon |
| STG3 | Natural Gas Fired Combined Cycle | CA | 195.5 | 181.9 | May 2001 | Operating | — | coming soon |
Owner / operator
Operator: Westbrook Energy Center. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Westbrook Energy Center | 100.0% | 564 MW |
Nearby plants
Within 80 km.
| Larson | 5 MW | 1.6 km |
| Gorham Solar 1 (CSG) | 5 MW | 2.9 km |
| Regional Waste Systems | 13 MW | 3.2 km |
| Cross Town Energy Storage | 175 MW | 3.4 km |
| S D Warren Westbrook | 70 MW | 3.5 km |
| South Portland ESS, LLC | — | 5.2 km |