Compare power plants

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

Metric	Collierville Powerhouse Calaveras County	Mammoth Pool Madera County
Capacity	253 MW	190 MW
Technology	Conventional Hydroelectric	Conventional Hydroelectric
Operator	Northern California Power Agny	Southern California Edison Co
Operating units	2	2
Latest 12-month generation	397.3 GWh	571.5 GWh
Latest complete-year capacity factor	15.4% (2025)	28.0% (2025)
National technology rank	#57 of 1,349	#73 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	Collierville Powerhouse Calaveras County	Mammoth Pool Madera County
Capacity	253 MW	190 MW
Technology	Conventional Hydroelectric	Conventional Hydroelectric
Operator	Northern California Power Agny	Southern California Edison Co
Operating units	2	2
Latest 12-month generation	397.3 GWh	571.5 GWh
Latest complete-year capacity factor	15.4% (2025)	28.0% (2025)
National technology rank	#57 of 1,349	#73 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.