William F Wyman Hybrid
Cumberland County, Maine · EIA plant ID 1507 · Operator: FPL Energy Wyman LLC
Nameplate863MWSummer 827 MW
Generators5in service
Net generation323GWh12 mo to Jul 2026
Capacity factor2%gas/coal/oil units, summer MW
Heat rate10,635Btu/kWhfossil units, electric fuel, HHV
First online1957Runs as rarely runs
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 | 1,106.7 | — | — |
| 2002 | 407.8 | — | — |
| 2003 | 1,235.2 | 17.1% | 10,781 |
| 2004 | 687 | 9.5% | 10,988 |
| 2005 | 883.9 | 12.3% | 10,973 |
| 2006 | 67.6 | 0.9% | 14,718 |
| 2007 | 379.8 | 5.3% | 11,820 |
| 2008 | 168.8 | 2.3% | 13,055 |
| 2009 | 236.9 | 3.3% | 12,386 |
| 2010 | 159.8 | 2.2% | 15,415 |
| 2011 | 87.4 | 1.2% | 16,921 |
| 2012 | 59.1 | 0.8% | 18,464 |
| 2013 | 199.6 | 2.8% | 13,349 |
| 2014 | 253.2 | 3.6% | 11,729 |
| 2015 | 485.7 | 6.8% | 10,972 |
| 2016 | 92.3 | 1.3% | 14,071 |
| 2017 | 106.4 | 1.5% | 13,765 |
| 2018 | 156.4 | 2.2% | 11,202 |
| 2019 | 5.9 | 0.1% | 15,061 |
| 2020 | 10.6 | 0.2% | 14,215 |
| 2021 | 5.9 | 0.1% | 22,132 |
| 2022 | 234.1 | 3.3% | 10,986 |
| 2023 | 39.3 | 0.6% | 12,873 |
| 2024 | 35 | 0.5% | 12,536 |
| 2025 | 137.6 | 1.9% | 11,427 |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Petroleum Liquids | ST | 50 | 50.1 | Jan 1957 | Operating | — | coming soon |
| 2 | Petroleum Liquids | ST | 50 | 47.8 | Jan 1958 | Operating | — | coming soon |
| 3 | Petroleum Liquids | ST | 113.6 | 110.9 | Jan 1965 | Operating | — | coming soon |
| 4 | Petroleum Liquids | ST | 632.4 | 602.1 | Jan 1978 | Operating | — | coming soon |
| BESS | Batteries | BA | 16.7 | 16.2 | Dec 2016 | Operating | — | coming soon |
| W2 | Petroleum Liquids | ST | 50 | 52.3 | Jan 1958 | not_current | — | coming soon |
| W3 | Petroleum Liquids | ST | 113.6 | 117.1 | Jan 1965 | not_current | — | coming soon |
| W4 | Petroleum Liquids | ST | 632.4 | 609.2 | Jan 1978 | not_current | — | coming soon |
| WI | Petroleum Liquids | ST | 50 | 46.5 | Jan 1957 | not_current | — | coming soon |
Owner / operator
Operator: FPL Energy Wyman LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| FPL Energy Wyman LLC | 88.5% | 764 MW |
| Constellation Nuclear | 4.3% | 37 MW |
| Massachusetts Mun Wholes Electric Co | 2.7% | 23 MW |
| Public Service Co of NH | 2.3% | 20 MW |
| Green Mountain Power Corp | 2.1% | 19 MW |
| The Town of Lyndon Elec Dept - (VT) | 0.0% | 0 MW |
Nearby plants
Within 80 km.
| Boundary Line Solar, LLC | 1 MW | 9 km |
| Water Line Solar, LLC | 1 MW | 10.1 km |
| Cape Gas Turbine | 35 MW | 14.3 km |
| S D Warren Westbrook | 70 MW | 17.4 km |
| Regional Waste Systems | 13 MW | 17.8 km |
| South Portland ESS, LLC | — | 20 km |