Power plants operated by Puget Sound Energy Inc
Puget Sound Energy Inc operates 18 power plants in the 2025 EIA-860 data, with 3,218 MW of nameplate capacity, the 76th-largest fleet among the 5,826 operators on file. They are spread over two states: Washington and Montana. Natural gas is 60% of the capacity; the largest site is Fredonia (WA). Its oldest working unit dates from 1898, at Snoqualmie. Units added from 2020 to 2025 total 248 MW.
- Natural gas1,932 MW60%
- Wind1,020 MW32%
- Hydroelectric260 MW8.1%
- Oil and petroleum2.7 MW0.1%
- Battery storage2 MW0.1%
- Solar0.5 MW0.0%
Capacity by decade it came online
Natural gasOil and petroleumHydroelectricWindSolarBattery storage
Above the line: capacity operating in 2025. Below: capacity retired at these plants.
Plants
| Plant | State | Runs on | Capacity | First unit |
|---|---|---|---|---|
| Fredonia (WA) | Washington | Natural gas | 376 MW | 1984 |
| Lower Snake River Wind Energy Project | Washington | Wind | 343 MW | 2012 |
| Mint Farm Generating Station | Washington | Natural gas | 319 MW | 2008 |
| Goldendale Generating Station | Washington | Natural gas | 303 MW | 2004 |
| Ferndale Generating Station | Washington | Natural gas | 286 MW | 1994 |
| Wild Horse | Washington | Wind | 273 MW | 2006 |
| Beaver Creek Wind Facility | Montana | Wind | 248 MW | 2025 |
| Frederickson | Washington | Natural gas | 178 MW | 1981 |
| Encogen | Washington | Natural gas | 176 MW | 1993 |
| Whitehorn | Washington | Natural gas | 169 MW | 1981 |
| Hopkins Ridge Wind | Washington | Wind | 157 MW | 2005 |
| Sumas Power Plant | Washington | Natural gas | 126 MW | 1993 |
| Upper Baker | Washington | Hydroelectric | 105 MW | 1959 |
| Lower Baker | Washington | Hydroelectric | 104 MW | 1960 |
| Snoqualmie 2 | Washington | Hydroelectric | 38.7 MW | 1957 |
| Snoqualmie | Washington | Hydroelectric | 12.8 MW | 1898 |
| Crystal Mountain | Washington | Oil and petroleum | 2.7 MW | 1969 |
| Glacier Battery Storage | Washington | Battery storage | 2 MW | 2016 |