Registry, engineering, and operating metrics shown on a consistent EIA basis.
| Metric | Blenheim Gilboa | Lewiston Niagara |
|---|---|---|
| Capacity | 1,000 MW | 220 MW |
| Technology | Hydroelectric Pumped Storage | Hydroelectric Pumped Storage |
| Operator | New York Power Authority | New York Power Authority |
| Operating units | 4 | 12 |
| Latest 12-month generation | 560.0 GWh | 479.9 GWh |
| Latest complete-year capacity factor | — | — |
| National technology rank | #9 of 39 | #24 of 39 |
| Latest EIA report | 2026-06 | 2026-06 |