# Mammoth Pool CAISO Conventional Hydroelectric · https://askthegrid.com/assets/facilities/mammoth-pool 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. ## Key facts - Technology: Conventional Hydroelectric - Power capacity: 190 MW - Commercial operation: 1960 - Operating status: operating ## Grid and market context - ISO/RTO: CAISO - Balancing authority: California Independent System Operator (CAISO; CISO) - Substation: Substation adjacent to Mammoth Pool Powerhouse - Point of interconnection: Substation adjacent to Mammoth Pool Powerhouse - Transmission owner: Southern California Edison Company - Interconnection voltage: 230 kV ## Source-backed facts - Owner logo domain: sce.com — Mammoth Pool Hydroelectric Project | California State Water Resources Control Board · confidence: medium - Identifiers: [{"value":"344","system":"EIA plant ID"},{"value":"2085","system":"FERC project number"},{"value":"P-2085-000","system":"FERC docket"},{"value":"C000041","system":"FERC company identifier (CID)"},{"value":"CAISO (CISO)","system":"ISO/RTO"},{"value":"BIGCRK_7_MAMRES","system":"CAISO resource ID"}] — Asset Appendix Report - MBR Portal · confidence: medium - Identifiers: [{"value":"344","system":"EIA plant ID"},{"value":"2085","system":"FERC project number"},{"value":"P-2085-000","system":"FERC docket"},{"value":"C000041","system":"FERC company identifier (CID)"},{"value":"CAISO (CISO)","system":"ISO/RTO"},{"value":"BIGCRK_7_MAMRES","system":"CAISO resource ID"}] — Sheet 1 · confidence: medium - Description: Mammoth Pool is a 190 MW hydroelectric power plant in Madera County, California, identified in the FERC EIA lookup as plant code 344. The Mammoth Pool Project is part of Southern California Edison’s Big Creek Hydroelectric System and is owned and operated by SCE. The project is licensed under FERC Project No. 2085, and its powerhouse contains two Francis-type vertical-shaft hydraulic reaction turbines. — Asset Appendix Report - MBR Portal · confidence: medium - Description: Mammoth Pool is a 190 MW hydroelectric power plant in Madera County, California, identified in the FERC EIA lookup as plant code 344. The Mammoth Pool Project is part of Southern California Edison’s Big Creek Hydroelectric System and is owned and operated by SCE. The project is licensed under FERC Project No. 2085, and its powerhouse contains two Francis-type vertical-shaft hydraulic reaction turbines. — SECTION 4.32 GENERAL INFORMATION This section of the Application for New License for the Project is intended to set forth · confidence: medium - Description: Mammoth Pool is a 190 MW hydroelectric power plant in Madera County, California, identified in the FERC EIA lookup as plant code 344. The Mammoth Pool Project is part of Southern California Edison’s Big Creek Hydroelectric System and is owned and operated by SCE. The project is licensed under FERC Project No. 2085, and its powerhouse contains two Francis-type vertical-shaft hydraulic reaction turbines. — Mammoth Pool Hydroelectric Project | California State Water Resources Control Board · confidence: medium - Parties: [{"relationship":"Owner, operator, and FERC licensee","name":"Southern California Edison Company","official_url":"https://www.sce.com/"},{"relationship":"EPC / original designer and constructor","name":"Bechtel Corporation","official_url":"https://www.bechtel.com/"}] — Mammoth Pool Hydroelectric Project | California State Water Resources Control Board · confidence: high - Parties: [{"relationship":"Owner, operator, and FERC licensee","name":"Southern California Edison Company","official_url":"https://www.sce.com/"},{"relationship":"EPC / original designer and constructor","name":"Bechtel Corporation","official_url":"https://www.bechtel.com/"}] — Volume 1 · confidence: high - Identifiers.0: {"value":"344","system":"EIA plant ID"} — Asset Appendix Report - MBR Portal · confidence: medium - Identifiers.3: {"value":"C000041","system":"FERC company identifier (CID)"} — Asset Appendix Report - MBR Portal · confidence: high - Identifiers.4: {"value":"CAISO (CISO)","system":"ISO/RTO"} — Asset Appendix Report - MBR Portal · confidence: medium - Identifiers.4: {"value":"CAISO (CISO)","system":"ISO/RTO"} — Sheet 1 · confidence: medium - Identifiers.5: {"value":"BIGCRK_7_MAMRES","system":"CAISO resource ID"} — Sheet 1 · confidence: medium - Parties.0: {"relationship":"Owner, operator, and FERC licensee","name":"Southern California Edison Company","official_url":"https://www.sce.com/"} — Mammoth Pool Hydroelectric Project | California State Water Resources Control Board · confidence: high - Parties.1: {"relationship":"EPC / original designer and constructor","name":"Bechtel Corporation","official_url":"https://www.bechtel.com/"} — Volume 1 · confidence: high - Interconnection: SCE transmission network via a transmission line to the non-project Big Creek No. 3 (Powerhouse No. 3) switchyard; the project application describes the connecting line as 230 kV. — Volume 1 · confidence: medium - Unit configuration: Conventional hydroelectric facility with two Francis-type vertical-shaft hydraulic-reaction turbine units, each rated at 100,000 HP and 360 rpm. — Volume 1 · confidence: medium - Power mw: 190 — SECTION 4.32 GENERAL INFORMATION This section of the Application for New License for the Project is intended to set forth · confidence: medium - Unit count: 2 — Mammoth Pool Hydroelectric Project · confidence: medium - Construction scope: Mammoth Pool is a hydroelectric project consisting of Mammoth Pool Dam and Reservoir, a 39,350-foot power tunnel, surge chamber, rock trap, a single 1,988-foot penstock, Mammoth Pool Powerhouse, transmission facilities, and a separate fishwater-generator installation. The powerhouse contains two Francis-type vertical-shaft hydraulic reaction turbines and two main generators; the fishwater installation contains one Pelton-type turbine and generator. The project was constructed by Bechtel Corporation for Southern California Edison, with construction completed in early 1960. — SECTION 4.32 GENERAL INFORMATION This section of the Application for New License for the Project is intended to set forth · confidence: medium - Equipment models: [{"manufacturer_domain":null,"product_url":null,"count":2,"unit_mw":95,"name":"Francis-type vertical-shaft hydraulic reaction turbine"},{"manufacturer_domain":null,"product_url":null,"count":2,"unit_mw":95,"name":"Vertical-shaft, three-bearing, Y-connected main generator"},{"manufacturer_domain":null,"product_url":null,"count":1,"unit_mw":null,"name":"Pelton-type fishwater turbine"},{"manufacturer_domain":null,"product_url":null,"count":1,"unit_mw":null,"name":"Two-bearing horizontal-shaft fishwater generator"}] — D1110002 Southern California Edison 2009 Energy Resource Recovery Account Compliance and Reasonableness Review · confidence: medium - Equipment models.0: {"manufacturer_domain":null,"product_url":null,"count":2,"unit_mw":95,"name":"Francis-type vertical-shaft hydraulic reaction turbine"} — D1110002 Southern California Edison 2009 Energy Resource Recovery Account Compliance and Reasonableness Review · confidence: medium - Quality notes: ["","The records support SCE as the original applicant, licensee, and party for which the project was constructed. No separate acquisition, sale, predecessor-owner, transaction month/year, or sale consideration was identified for this exact project.","The documented post-start-up capital modification is extensive rehabilitation of the power-tunnel intake gate guides in 1972. SCE stated in its relicensing application that no new construction was proposed and that it had no current plans for future development; no expansion, repowering, or retirement event was identified."] — Source · confidence: medium - Quality notes: ["","The records support SCE as the original applicant, licensee, and party for which the project was constructed. No separate acquisition, sale, predecessor-owner, transaction month/year, or sale consideration was identified for this exact project.","The documented post-start-up capital modification is extensive rehabilitation of the power-tunnel intake gate guides in 1972. SCE stated in its relicensing application that no new construction was proposed and that it had no current plans for future development; no expansion, repowering, or retirement event was identified."] — Mammoth Pool Hydroelectric Project | California State Water Resources Control Board · confidence: medium - Quality notes: ["","The records support SCE as the original applicant, licensee, and party for which the project was constructed. No separate acquisition, sale, predecessor-owner, transaction month/year, or sale consideration was identified for this exact project.","The documented post-start-up capital modification is extensive rehabilitation of the power-tunnel intake gate guides in 1972. SCE stated in its relicensing application that no new construction was proposed and that it had no current plans for future development; no expansion, repowering, or retirement event was identified."] — Source · confidence: medium - Quality notes: ["","The records support SCE as the original applicant, licensee, and party for which the project was constructed. No separate acquisition, sale, predecessor-owner, transaction month/year, or sale consideration was identified for this exact project.","The documented post-start-up capital modification is extensive rehabilitation of the power-tunnel intake gate guides in 1972. SCE stated in its relicensing application that no new construction was proposed and that it had no current plans for future development; no expansion, repowering, or retirement event was identified."] — SECTION 4.32 GENERAL INFORMATION This section of the Application for New License for the Project is intended to set forth · confidence: medium - Financing summary: The 1957 Federal Power Commission order states that SCE submitted satisfactory evidence of its financial ability to construct and operate Mammoth Pool. — Source · confidence: medium - Financing summary: The 1957 Federal Power Commission order states that SCE submitted satisfactory evidence of its financial ability to construct and operate Mammoth Pool. — SECTION 4.32 GENERAL INFORMATION This section of the Application for New License for the Project is intended to set forth · confidence: medium - Timeline: [{"event":"Original license application filed","date":"1951-06-04","detail":"Southern California Edison Company filed the application for a license for the proposed Mammoth Pool Project, FERC Project No. 2085."},{"event":"Original FPC license issued","date":"1957-12-30","detail":"The 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."},{"event":"Construction commenced","date":"1958","detail":"Construction of Mammoth Pool Dam, the water-conveyance system, and the powerhouse commenced in spring 1958."},{"event":"Construction completed and commercial operation","date":"1960","detail":"The project was completed in early 1960 and placed into service during 1960. A plant directory reports commercial operation in March 1960."},{"event":"Intake rehabilitation","date":"1972","detail":"The gate guides at the power-tunnel intake were extensively rehabilitated. This was a rehabilitation project rather than a documented capacity expansion or repowering."},{"event":"Relicensing application","date":"2005","detail":"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."},{"event":"Original license expiration","date":"2007-11-30","detail":"The original FERC license period ended November 30, 2007."},{"event":"Annual license issued","date":"2008-02-25","detail":"FERC issued an annual license for Project No. 2085 to Southern California Edison Company after the original license period ended."},{"event":"Acquisition or sale transaction","date":null,"detail":"No separate acquisition, sale, predecessor-owner transfer, or transaction month/year was identified. The historical record instead identifies SCE as the original applicant and licensee and states that Bechtel constructed the project for SCE."}] — Source · confidence: medium - Timeline: [{"event":"Original license application filed","date":"1951-06-04","detail":"Southern California Edison Company filed the application for a license for the proposed Mammoth Pool Project, FERC Project No. 2085."},{"event":"Original FPC license issued","date":"1957-12-30","detail":"The 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."},{"event":"Construction commenced","date":"1958","detail":"Construction of Mammoth Pool Dam, the water-conveyance system, and the powerhouse commenced in spring 1958."},{"event":"Construction completed and commercial operation","date":"1960","detail":"The project was completed in early 1960 and placed into service during 1960. A plant directory reports commercial operation in March 1960."},{"event":"Intake rehabilitation","date":"1972","detail":"The gate guides at the power-tunnel intake were extensively rehabilitated. This was a rehabilitation project rather than a documented capacity expansion or repowering."},{"event":"Relicensing application","date":"2005","detail":"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."},{"event":"Original license expiration","date":"2007-11-30","detail":"The original FERC license period ended November 30, 2007."},{"event":"Annual license issued","date":"2008-02-25","detail":"FERC issued an annual license for Project No. 2085 to Southern California Edison Company after the original license period ended."},{"event":"Acquisition or sale transaction","date":null,"detail":"No separate acquisition, sale, predecessor-owner transfer, or transaction month/year was identified. The historical record instead identifies SCE as the original applicant and licensee and states that Bechtel constructed the project for SCE."}] — SECTION 4.32 GENERAL INFORMATION This section of the Application for New License for the Project is intended to set forth · confidence: medium - Timeline: [{"event":"Original license application filed","date":"1951-06-04","detail":"Southern California Edison Company filed the application for a license for the proposed Mammoth Pool Project, FERC Project No. 2085."},{"event":"Original FPC license issued","date":"1957-12-30","detail":"The 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."},{"event":"Construction commenced","date":"1958","detail":"Construction of Mammoth Pool Dam, the water-conveyance system, and the powerhouse commenced in spring 1958."},{"event":"Construction completed and commercial operation","date":"1960","detail":"The project was completed in early 1960 and placed into service during 1960. A plant directory reports commercial operation in March 1960."},{"event":"Intake rehabilitation","date":"1972","detail":"The gate guides at the power-tunnel intake were extensively rehabilitated. This was a rehabilitation project rather than a documented capacity expansion or repowering."},{"event":"Relicensing application","date":"2005","detail":"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."},{"event":"Original license expiration","date":"2007-11-30","detail":"The original FERC license period ended November 30, 2007."},{"event":"Annual license issued","date":"2008-02-25","detail":"FERC issued an annual license for Project No. 2085 to Southern California Edison Company after the original license period ended."},{"event":"Acquisition or sale transaction","date":null,"detail":"No separate acquisition, sale, predecessor-owner transfer, or transaction month/year was identified. The historical record instead identifies SCE as the original applicant and licensee and states that Bechtel constructed the project for SCE."}] — Southern California Edison Company Project No. 2085-... · confidence: medium - Commercial parties: [{"relationship":"Owner, operator, and FERC licensee","name":"Southern California Edison Company","detail":"SCE applied for the original FERC license, owns and operates Mammoth Pool as part of the Big Creek Hydroelectric System, and was the party for which the project was constructed.","official_url":"https://www.sce.com/"},{"relationship":"Original designer and constructor","name":"Bechtel Corporation","detail":"SCE’s project application states that Mammoth Pool was designed and constructed by Bechtel Corporation for Southern California Edison.","official_url":"https://www.bechtel.com/"}] — Mammoth Pool Hydroelectric Project | California State Water Resources Control Board · confidence: high - Commercial parties: [{"relationship":"Owner, operator, and FERC licensee","name":"Southern California Edison Company","detail":"SCE applied for the original FERC license, owns and operates Mammoth Pool as part of the Big Creek Hydroelectric System, and was the party for which the project was constructed.","official_url":"https://www.sce.com/"},{"relationship":"Original designer and constructor","name":"Bechtel Corporation","detail":"SCE’s project application states that Mammoth Pool was designed and constructed by Bechtel Corporation for Southern California Edison.","official_url":"https://www.bechtel.com/"}] — SECTION 4.32 GENERAL INFORMATION This section of the Application for New License for the Project is intended to set forth · confidence: high - Commercial parties.0: {"relationship":"Owner, operator, and FERC licensee","name":"Southern California Edison Company","detail":"SCE applied for the original FERC license, owns and operates Mammoth Pool as part of the Big Creek Hydroelectric System, and was the party for which the project was constructed.","official_url":"https://www.sce.com/"} — Mammoth Pool Hydroelectric Project | California State Water Resources Control Board · confidence: high - Commercial parties.0: {"relationship":"Owner, operator, and FERC licensee","name":"Southern California Edison Company","detail":"SCE applied for the original FERC license, owns and operates Mammoth Pool as part of the Big Creek Hydroelectric System, and was the party for which the project was constructed.","official_url":"https://www.sce.com/"} — SETTLEMENT AGREEMENT · confidence: high - Commercial parties.1: {"relationship":"Original designer and constructor","name":"Bechtel Corporation","detail":"SCE’s project application states that Mammoth Pool was designed and constructed by Bechtel Corporation for Southern California Edison.","official_url":"https://www.bechtel.com/"} — SECTION 4.32 GENERAL INFORMATION This section of the Application for New License for the Project is intended to set forth · confidence: high - Quality notes.1: The records support SCE as the original applicant, licensee, and party for which the project was constructed. No separate acquisition, sale, predecessor-owner, transaction month/year, or sale consideration was identified for this exact project. — Mammoth Pool Hydroelectric Project | California State Water Resources Control Board · confidence: high - Quality notes.1: The records support SCE as the original applicant, licensee, and party for which the project was constructed. No separate acquisition, sale, predecessor-owner, transaction month/year, or sale consideration was identified for this exact project. — Source · confidence: high - Quality notes.2: The documented post-start-up capital modification is extensive rehabilitation of the power-tunnel intake gate guides in 1972. SCE stated in its relicensing application that no new construction was proposed and that it had no current plans for future development; no expansion, repowering, or retirement event was identified. — SECTION 4.32 GENERAL INFORMATION This section of the Application for New License for the Project is intended to set forth · confidence: medium - Timeline.0: {"event":"Original license application filed","date":"1951-06-04","detail":"Southern California Edison Company filed the application for a license for the proposed Mammoth Pool Project, FERC Project No. 2085."} — Source · confidence: high - Timeline.1: {"event":"Original FPC license issued","date":"1957-12-30","detail":"The 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."} — Source · confidence: high - Timeline.2: {"event":"Construction commenced","date":"1958","detail":"Construction of Mammoth Pool Dam, the water-conveyance system, and the powerhouse commenced in spring 1958."} — SECTION 4.32 GENERAL INFORMATION This section of the Application for New License for the Project is intended to set forth · confidence: high - Timeline.3: {"event":"Construction completed and commercial operation","date":"1960","detail":"The project was completed in early 1960 and placed into service during 1960. A plant directory reports commercial operation in March 1960."} — SECTION 4.32 GENERAL INFORMATION This section of the Application for New License for the Project is intended to set forth · confidence: medium - Timeline.4: {"event":"Intake rehabilitation","date":"1972","detail":"The gate guides at the power-tunnel intake were extensively rehabilitated. This was a rehabilitation project rather than a documented capacity expansion or repowering."} — SECTION 4.32 GENERAL INFORMATION This section of the Application for New License for the Project is intended to set forth · confidence: high - Timeline.5: {"event":"Relicensing application","date":"2005","detail":"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."} — SECTION 4.32 GENERAL INFORMATION This section of the Application for New License for the Project is intended to set forth · confidence: medium - Timeline.6: {"event":"Original license expiration","date":"2007-11-30","detail":"The original FERC license period ended November 30, 2007."} — Mammoth Pool Hydroelectric Project | California State Water Resources Control Board · confidence: high - Timeline.7: {"event":"Annual license issued","date":"2008-02-25","detail":"FERC issued an annual license for Project No. 2085 to Southern California Edison Company after the original license period ended."} — Southern California Edison Company Project No. 2085-... · confidence: high - Timeline.8: {"event":"Acquisition or sale transaction","date":null,"detail":"No separate acquisition, sale, predecessor-owner transfer, or transaction month/year was identified. The historical record instead identifies SCE as the original applicant and licensee and states that Bechtel constructed the project for SCE."} — Source · confidence: medium - Timeline.8: {"event":"Acquisition or sale transaction","date":null,"detail":"No separate acquisition, sale, predecessor-owner transfer, or transaction month/year was identified. The historical record instead identifies SCE as the original applicant and licensee and states that Bechtel constructed the project for SCE."} — SECTION 4.32 GENERAL INFORMATION This section of the Application for New License for the Project is intended to set forth · confidence: medium ## Timeline - 1951-06-04 — Original license application filed Southern California Edison Company filed the application for a license for the proposed Mammoth Pool Project, FERC Project No. 2085. Source: Source (https://www.waterboards.ca.gov/water_issues/programs/cannabis/docs/ferc_license/ferc_p2085_mammoth_pool.pdf) - 1957-12-30 — Original FPC license issued The 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. Source: Source (https://www.waterboards.ca.gov/water_issues/programs/cannabis/docs/ferc_license/ferc_p2085_mammoth_pool.pdf) - 1960 — Construction completed and commercial operation The project was completed in early 1960 and placed into service during 1960. A plant directory reports commercial operation in March 1960. Source: SECTION 4.32 GENERAL INFORMATION This section of the Application for New License for the Project is intended to set forth (https://www.sce.com/sites/default/files/inline-files/mpappvol1.pdf) - 2005 — Relicensing application 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. Source: SECTION 4.32 GENERAL INFORMATION This section of the Application for New License for the Project is intended to set forth (https://www.sce.com/sites/default/files/inline-files/mpappvol1.pdf) - 2007-11-30 — Original license expiration The original FERC license period ended November 30, 2007. Source: Mammoth Pool Hydroelectric Project | California State Water Resources Control Board (https://www.waterboards.ca.gov/waterrights/water_issues/programs/water_quality_cert/big_creek/big_creek_2085.shtml) ## Sources - [Mammoth Pool Hydroelectric Project | California State Water Resources Control Board](https://www.waterboards.ca.gov/waterrights/water_issues/programs/water_quality_cert/big_creek/big_creek_2085.shtml) — waterboards.ca.gov · tier regulatory - [Asset Appendix Report - MBR Portal](https://mbrweb.ferc.gov/SearchMBRAssetAppendix/AssetAppendixDetails?page=2&AssetAppendixId=2886) — mbrweb.ferc.gov · tier regulatory - [Southern California Edison Company Project No. 2085- ...](https://www.sce.com/sites/default/files/inline-files/mpannuallicense.pdf) — sce.com · tier other - [Sheet 1](https://www.caiso.com/documents/alloc-mn-2025-m07-etc-source-and-sink-apnodes-db134.xlsx) — caiso.com · tier other - [SECTION 4.32 GENERAL INFORMATION This section of the Application for New License for the Project is intended to set forth](https://www.sce.com/sites/default/files/inline-files/mpappvol1.pdf) — sce.com · tier other - [Source](https://mbrweb.ferc.gov/SearchMBRAssetAppendix/AssetAppendixDetails?AssetAppendixId=2886&page=2) — mbrweb.ferc.gov · tier regulatory - [Conclusions Author's Closure G. D. Johnson 182 / APRIL 196 1 Transactions of the AS ME](https://asmedigitalcollection.asme.org/gasturbinespower/article-pdf/83/2/182/5487600/182_1.pdf) — asmedigitalcollection.asme.org · tier other - [Turbines & shut-off valves](https://www.voith.com/corp-en/products-services/hydropower-components/turbines.html) — voith.com · tier other - [D1110002 Southern California Edison 2009 Energy Resource Recovery Account Compliance and Reasonableness Review](https://docs.cpuc.ca.gov/PublishedDocs/PUBLISHED/FINAL_DECISION/145048-06.htm) — docs.cpuc.ca.gov · tier regulatory - [Source](https://www.waterboards.ca.gov/water_issues/programs/cannabis/docs/ferc_license/ferc_p2085_mammoth_pool.pdf) — waterboards.ca.gov · tier regulatory - [SETTLEMENT AGREEMENT](https://www.waterboards.ca.gov/waterrights/water_issues/programs/water_quality_cert/big_creek/docs/bc_settlement_agree.pdf) — waterboards.ca.gov · tier regulatory - [Source](https://www.waterboards.ca.gov/waterrights/water_issues/programs/water_quality_cert/docs/bigcreek_fercs/bigcreekcert.pdf) — waterboards.ca.gov · tier regulatory - [Source](https://api.eia.gov/v2/electricity/operating-generator-capacity/data/?api_key=DEMO_KEY&facets%5Bplantid%5D%5B%5D=344&data%5B%5D=nameplate-capacity-mw&data%5B%5D=operating-year-month&data%5B%5D=planned-retirement-year-month&frequency=monthly&sort%5B0%5D%5Bcolumn%5D=period&sort%5B0%5D%5Bdirection%5D=desc&length=10) — api.eia.gov · tier regulatory ## Data quality - The records support SCE as the original applicant, licensee, and party for which the project was constructed. No separate acquisition, sale, predecessor-owner, transaction month/year, or sale consideration was identified for this exact project. The documented post-start-up capital modification is extensive rehabilitation of the power-tunnel intake gate guides in 1972. SCE stated in its relicensing application that no new construction was proposed and that it had no current plans for future development; no expansion, repowering, or retirement event was identified. --- Canonical page: https://askthegrid.com/assets/facilities/mammoth-pool Source: Ask the Grid — https://askthegrid.com/