Mammoth Pool

Power plant · Hydro

Key facts

Power plant · Hydro Operating

Commissioned: 1960
Net generation, 2025: 465,889 MWh
Grid: 220 kV to Southern California Edison Co (CISO)
Location: Madera County, California
Operated by: Southern California Edison CoSourceEIA-860M Preliminary Monthly Electric Generator Inventory

Net generation MWh by year, 2001 to 2026

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All 6 attributes from EIA-860M Preliminary Monthly Electric Generator Inventory

Attributes
Attribute	Value
Gem	Unit ids G100000603895 Location id L100000603857
Grid	Nerc region WECC Report year 2025 Grid voltage kv 220 Transmission owner Southern California Edison Co Balancing authority code CISO Balancing authority name California Independent System Operator
Fuel burned (MMBtu), 2025	1,589,613
Capacity factor, 2025	0.280
Net generation (MWh), 2025	465,889
Balancing authority code	CISO

4 sources

Sources

EIA-860M Preliminary Monthly Electric Generator InventoryOpen license · retrieved 4 Nov 2026
Global Energy Monitor — Global Integrated Power Tracker (unit-level power plants, eight technologies, all statuses)Open license, with credit · retrieved 26 Oct 2026Global Integrated Power Tracker, Global Energy Monitor, September 2026 release (https://globalenergymonitor.org/projects/global-integrated-power-tracker), CC BY 4.0. Modified by Inframation: TransitionZero-sourced rows removed; statuses and technologies mapped to Inframation's vocabulary; figures aggregated. Copyright © Global Energy Monitor. Global Integrated Power Tracker, September 2026 release. Distributed under a Creative Commons Attribution 4.0 International License.
EIA Open Data bulk file — Electricity (ELEC.zip; monthly plant net generation and fuel consumption since 2001)Open license · retrieved 1 Nov 2026Source: U.S. Energy Information Administration, Electricity bulk data (Form EIA-923 monthly plant series)
EIA-860M Preliminary Monthly Electric Generator Inventory