Registry, engineering, and operating metrics shown on a consistent EIA basis.
| Metric | Helms Pumped Storage | Edward C Hyatt |
|---|---|---|
| 1,053 MW | 644.1 MW | |
| Hydroelectric Pumped Storage | Conventional Hydroelectric, Hydroelectric Pumped Storage | |
| Pacific Gas & Electric Co. | California Dept. of Water Resources | |
| 3 | 6 | |
| 1.11 TWh | 2.08 TWh | |
| — | 34.6% (2025) | |
| #8 of 39 | #39 of 1,349 | |
| 2026-06 | 2026-06 |