Registry, engineering, and operating metrics shown on a consistent EIA basis.
| Metric | Guernsey Power Station | Tenaska Westmoreland Generating Station |
|---|---|---|
| 2,055 MW | 1,134 MW | |
| Natural Gas Fired Combined Cycle | Natural Gas Fired Combined Cycle | |
| Guernsey Power Station LLC | Tenaska Pennsylvania Partners, LLC | |
| 3 | 3 | |
| 12.15 TWh | 6.37 TWh | |
| 62.8% (2025) | 63.4% (2025) | |
| #7 of 538 | #73 of 538 | |
| 2026-06 | 2026-06 |