Mammoth Pool
Southern California Edison CompanyMadera County
Mammoth Pool is a hydroelectric facility with 190 MW of EIA-reported operating capacity in Madera County, California, registered as EIA Plant ID 344. Southern California Edison Co owns and operates the plant. The plant's generating configuration is conventional hydroelectric facility with two Francis-type vertical-shaft hydraulic-reaction turbine units, each rated at 100,000 HP and 360 rpm. Commercial operation began in 1960. The facility interconnects at Substation adjacent to Mammoth Pool Powerhouse at 230 kV.
Mapped infrastructure geometry associated with this asset.
Conventional Hydroelectric
Mammoth Pool is operating.
230 kV · Southern California Edison Company
EIA plant 344 · Inventory for Sep 2026.
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| 1 | Conventional Hydroelectric | Operating | 95 | Unknown |
| 2 | Conventional Hydroelectric | Operating | 95 | Unknown |
Similar plants ranked by technology, capacity, and distance.
Current generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| 1 | 95 MW 95 MW summer | Conventional Hydroelectric HY | Mar 1960 | Operating |
| 2 | 95 MW 95 MW summer | Conventional Hydroelectric HY | Mar 1960 | Operating |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
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Project milestones and public references behind the asset profile.
Southern California Edison Company filed the application for a license for the proposed Mammoth Pool Project, FERC Project No. 2085.
CAISO
CAISO · Madera County
Monthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
| Largest reported plants | Capacity | State | |
|---|---|---|---|
| Mountainview Generating Station | 1,036.8 MW | CA | |
| Cathode (Hinson) BESS | 200 MW | CA | |
| J S Eastwood | 199.8 MW | CA | |
| Mammoth PoolCurrent | 190 MW | CA | |
| Big Creek 3 | 174.5 MW | CA | |
| Separator (Etiwanda) BESS | 112.5 MW | CA | |
| Big Creek 4 | 100 MW | CA | |
| Big Creek 1 | 88.4 MW | CA |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
View full reporting portfolioThe Federal Power Commission issued a major license to Southern California Edison Company for 50 years, effective December 1, 1957, authorizing construction, operation, and maintenance of Project No. 2085.
The project was completed in early 1960 and placed into service during 1960. A plant directory reports commercial operation in March 1960.
EIA-860 lists generator 1, generator 2 with this operating date.
SCE’s application for a new license described Mammoth Pool as an existing project, proposed no new construction, and stated that SCE had no current plans for future development.
The original FERC license period ended November 30, 2007.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Mammoth Pool reports 190 MW hydroelectric of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Sep 2026.
Mammoth Pool is a Conventional Hydroelectric facility in Madera County, CA, participating in the CAISO market.
Mammoth Pool is in Madera County, CA, inside the CAISO balancing area.
Mammoth Pool is operated by Southern California Edison Co according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Mammoth Pool reports a commercial operation date of 1960. Current status: operating. Source: EIA Sep 2026.
Mammoth Pool reported 573.5 GWh over the twelve months to 2026-07. Figures are net generation as filed to EIA-923.
Mammoth Pool interconnects at Substation adjacent to Mammoth Pool Powerhouse, on the Southern California Edison Company system.
By capacity, Mammoth Pool ranks #73 of 1,356 operating plants of the same technology nationally. It ranks #9 of 210 in CA.
Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.
