Registry, engineering, and operating metrics shown on a consistent EIA basis.
| Metric | Helms Pumped Storage | W R Gianelli |
|---|---|---|
| 1,053 MW | 424 MW | |
| Hydroelectric Pumped Storage | Hydroelectric Pumped Storage | |
| Pacific Gas & Electric Co. | California Dept. of Water Resources | |
| 3 | 8 | |
| 1.11 TWh | 224.3 GWh | |
| — | — | |
| #8 of 39 | #15 of 39 | |
| 2026-06 | 2026-06 |