Compare power plants

Registry, engineering, and operating metrics shown on a consistent EIA basis.

Metric	Mammoth Pool Madera County	Haas Fresno County
Capacity	190 MW	135 MW
Technology	Conventional Hydroelectric	Conventional Hydroelectric
Operator	Southern California Edison Co	Pacific Gas & Electric Co.
Operating units	2	2
Latest 12-month generation	571.5 GWh	153.3 GWh
Latest complete-year capacity factor	28.0% (2025)	14.7% (2025)
National technology rank	#73 of 1,349	#112 of 1,349
Latest EIA report	2026-06	2026-06

Generation comes from EIA-923. Capacity, unit counts, technology, and reporting relationships come from EIA-860. Incomplete reporting years are excluded from capacity-factor comparisons.

Compare power plants

Registry, engineering, and operating metrics shown on a consistent EIA basis.

Metric	Mammoth Pool Madera County	Haas Fresno County
Capacity	190 MW	135 MW
Technology	Conventional Hydroelectric	Conventional Hydroelectric
Operator	Southern California Edison Co	Pacific Gas & Electric Co.
Operating units	2	2
Latest 12-month generation	571.5 GWh	153.3 GWh
Latest complete-year capacity factor	28.0% (2025)	14.7% (2025)
National technology rank	#73 of 1,349	#112 of 1,349
Latest EIA report	2026-06	2026-06

Generation comes from EIA-923. Capacity, unit counts, technology, and reporting relationships come from EIA-860. Incomplete reporting years are excluded from capacity-factor comparisons.