# High Desert Power Plant CAISO Natural Gas Fired Combined Cycle · https://askthegrid.com/assets/facilities/high-desert-power-plant High Desert Power Plant is a natural gas-fired power facility with 960 MW of EIA-reported nameplate capacity in San Bernardino County, California, registered as EIA Plant ID 55518. High Desert was described as the first new major power plant serving Southern California in more than a decade. Commercial operation began on April 22, 2003. Its grid role is dispatchable combined-cycle thermal generation; historically, the plant's entire output was under California Department of Water Resources dispatch. ROADWAY_1_N001 · 230 kV · Southern California Edison Co. ## Key facts - Technology: Natural Gas Fired Combined Cycle - Power capacity: 960 MW - Operating status: operating ## Grid and market context - ISO/RTO: CAISO - Balancing authority: California Independent System Operator (CAISO/CISO) ## Source-backed facts - Identifiers: [{"value":"55518","system":"EIA plant code"},{"value":"13474 (CTG1)","system":"EIA generator record"},{"value":"13475 (CTG2)","system":"EIA generator record"},{"value":"13476 (CTG3)","system":"EIA generator record"},{"value":"13477 (STG1)","system":"EIA generator record"},{"value":"G0778","system":"California Energy Commission plant ID"},{"value":"97-AFC-01","system":"CEC docket"},{"value":"03-109-000","system":"FERC exempt wholesale generator docket"},{"value":"HIDSRT_2_UNITS","system":"CAISO resource ID"},{"value":"HIGH DESERT POWER PROJECT AGGREGATE","system":"CAISO aggregate resource"},{"value":"ROADWAY_1_N001","system":"CAISO LMP node"},{"value":"CAISO (CISO)","system":"Balancing authority"},{"value":"SP15","system":"CAISO zone"}] — MBR | Index · confidence: medium - Identifiers: [{"value":"55518","system":"EIA plant code"},{"value":"13474 (CTG1)","system":"EIA generator record"},{"value":"13475 (CTG2)","system":"EIA generator record"},{"value":"13476 (CTG3)","system":"EIA generator record"},{"value":"13477 (STG1)","system":"EIA generator record"},{"value":"G0778","system":"California Energy Commission plant ID"},{"value":"97-AFC-01","system":"CEC docket"},{"value":"03-109-000","system":"FERC exempt wholesale generator docket"},{"value":"HIDSRT_2_UNITS","system":"CAISO resource ID"},{"value":"HIGH DESERT POWER PROJECT AGGREGATE","system":"CAISO aggregate resource"},{"value":"ROADWAY_1_N001","system":"CAISO LMP node"},{"value":"CAISO (CISO)","system":"Balancing authority"},{"value":"SP15","system":"CAISO zone"}] — Cross-Reference Table · confidence: medium - Identifiers: [{"value":"55518","system":"EIA plant code"},{"value":"13474 (CTG1)","system":"EIA generator record"},{"value":"13475 (CTG2)","system":"EIA generator record"},{"value":"13476 (CTG3)","system":"EIA generator record"},{"value":"13477 (STG1)","system":"EIA generator record"},{"value":"G0778","system":"California Energy Commission plant ID"},{"value":"97-AFC-01","system":"CEC docket"},{"value":"03-109-000","system":"FERC exempt wholesale generator docket"},{"value":"HIDSRT_2_UNITS","system":"CAISO resource ID"},{"value":"HIGH DESERT POWER PROJECT AGGREGATE","system":"CAISO aggregate resource"},{"value":"ROADWAY_1_N001","system":"CAISO LMP node"},{"value":"CAISO (CISO)","system":"Balancing authority"},{"value":"SP15","system":"CAISO zone"}] — High Desert Power Plant | California Energy Commission · confidence: medium - Identifiers: [{"value":"55518","system":"EIA plant code"},{"value":"13474 (CTG1)","system":"EIA generator record"},{"value":"13475 (CTG2)","system":"EIA generator record"},{"value":"13476 (CTG3)","system":"EIA generator record"},{"value":"13477 (STG1)","system":"EIA generator record"},{"value":"G0778","system":"California Energy Commission plant ID"},{"value":"97-AFC-01","system":"CEC docket"},{"value":"03-109-000","system":"FERC exempt wholesale generator docket"},{"value":"HIDSRT_2_UNITS","system":"CAISO resource ID"},{"value":"HIGH DESERT POWER PROJECT AGGREGATE","system":"CAISO aggregate resource"},{"value":"ROADWAY_1_N001","system":"CAISO LMP node"},{"value":"CAISO (CISO)","system":"Balancing authority"},{"value":"SP15","system":"CAISO zone"}] — Non-Resource Adequacy Capacity Table - December 2024 · confidence: medium - Identifiers: [{"value":"55518","system":"EIA plant code"},{"value":"13474 (CTG1)","system":"EIA generator record"},{"value":"13475 (CTG2)","system":"EIA generator record"},{"value":"13476 (CTG3)","system":"EIA generator record"},{"value":"13477 (STG1)","system":"EIA generator record"},{"value":"G0778","system":"California Energy Commission plant ID"},{"value":"97-AFC-01","system":"CEC docket"},{"value":"03-109-000","system":"FERC exempt wholesale generator docket"},{"value":"HIDSRT_2_UNITS","system":"CAISO resource ID"},{"value":"HIGH DESERT POWER PROJECT AGGREGATE","system":"CAISO aggregate resource"},{"value":"ROADWAY_1_N001","system":"CAISO LMP node"},{"value":"CAISO (CISO)","system":"Balancing authority"},{"value":"SP15","system":"CAISO zone"}] — Curtailed and Non-Operational Generating Units · confidence: medium - Identifiers: [{"value":"55518","system":"EIA plant code"},{"value":"13474 (CTG1)","system":"EIA generator record"},{"value":"13475 (CTG2)","system":"EIA generator record"},{"value":"13476 (CTG3)","system":"EIA generator record"},{"value":"13477 (STG1)","system":"EIA generator record"},{"value":"G0778","system":"California Energy Commission plant ID"},{"value":"97-AFC-01","system":"CEC docket"},{"value":"03-109-000","system":"FERC exempt wholesale generator docket"},{"value":"HIDSRT_2_UNITS","system":"CAISO resource ID"},{"value":"HIGH DESERT POWER PROJECT AGGREGATE","system":"CAISO aggregate resource"},{"value":"ROADWAY_1_N001","system":"CAISO LMP node"},{"value":"CAISO (CISO)","system":"Balancing authority"},{"value":"SP15","system":"CAISO zone"}] — qfer eia caiso · confidence: medium - Official project url: https://www.energy.ca.gov/powerplant/combined-cycle/high-desert-power-plant — High Desert Power Plant | California Energy Commission · confidence: high - Description: High Desert Power Plant is a natural-gas-fired combined-cycle facility in Victorville, San Bernardino County, California. It was certified by the California Energy Commission in 2000 and began commercial operation on April 22, 2003. The CEC-certified configuration comprises three Siemens gas turbines, three Alstom heat-recovery steam generators, and one Toshiba steam turbine. Subsequent turbine and generator upgrades increased output by more than 60 MW and improved emissions performance. — High Desert Power Plant | California Energy Commission · confidence: medium - Description: High Desert Power Plant is a natural-gas-fired combined-cycle facility in Victorville, San Bernardino County, California. It was certified by the California Energy Commission in 2000 and began commercial operation on April 22, 2003. The CEC-certified configuration comprises three Siemens gas turbines, three Alstom heat-recovery steam generators, and one Toshiba steam turbine. Subsequent turbine and generator upgrades increased output by more than 60 MW and improved emissions performance. — High Desert Power Plant: Empowering California | Middle River Power · confidence: medium - Canonical name: High Desert Power Plant — High Desert Power Plant | California Energy Commission · confidence: high - Identifiers.0: {"value":"55518","system":"EIA plant code"} — MBR | Index · confidence: high - Identifiers.1: {"value":"13474 (CTG1)","system":"EIA generator record"} — MBR | Index · confidence: high - Identifiers.2: {"value":"13475 (CTG2)","system":"EIA generator record"} — MBR | Index · confidence: high - Identifiers.3: {"value":"13476 (CTG3)","system":"EIA generator record"} — MBR | Index · confidence: high - Identifiers.4: {"value":"13477 (STG1)","system":"EIA generator record"} — MBR | Index · confidence: high - Identifiers.5: {"value":"G0778","system":"California Energy Commission plant ID"} — Cross-Reference Table · confidence: high - Identifiers.6: {"value":"97-AFC-01","system":"CEC docket"} — High Desert Power Plant | California Energy Commission · confidence: high - Identifiers.8: {"value":"HIDSRT_2_UNITS","system":"CAISO resource ID"} — Non-Resource Adequacy Capacity Table - December 2024 · confidence: medium - Identifiers.9: {"value":"HIGH DESERT POWER PROJECT AGGREGATE","system":"CAISO aggregate resource"} — Curtailed and Non-Operational Generating Units · confidence: medium - Identifiers.12: {"value":"SP15","system":"CAISO zone"} — qfer eia caiso · confidence: medium - Parties.2: {"relationship":"Plant operator","name":"Middle River Power","official_url":"https://middleriverpower.com"} — High Desert Power Plant: Empowering California | Middle River Power · confidence: medium - Parties.3: {"relationship":"EIA-registered utility entity for STG1","name":"MRP Generation Holdings, LLC","official_url":"https://middleriverpower.com"} — MBR | Index · confidence: medium - Parties.4: {"relationship":"Original developer and initial owner/operator","name":"Constellation Energy Group","official_url":null} — High Desert Power Project in California begins commercial operation · confidence: high - Parties.5: {"relationship":"Gas-turbine OEM","name":"Siemens Energy","official_url":"https://www.siemens-energy.com"} — High Desert Power Plant | California Energy Commission · confidence: high - Parties.6: {"relationship":"Heat-recovery steam-generator OEM","name":"Alstom","official_url":"https://www.alstom.com"} — High Desert Power Plant | California Energy Commission · confidence: high - Parties.7: {"relationship":"Steam-turbine OEM","name":"Toshiba","official_url":null} — High Desert Power Plant | California Energy Commission · confidence: medium - Unit configuration: Natural-gas-fired combined-cycle facility with 3 Siemens 501FD2 gas turbines, 3 Alstom heat-recovery steam generators, and 1 Toshiba steam turbine. — Source · confidence: medium - Commercial operation date: 2003-04-22 — Source · confidence: high - Product url: https://www.siemens-energy.com/global/en/home/products-services/product/sgt6-5000f.html — SGT6-5000F Heavy-duty gas turbine (60 Hz) · confidence: medium - Description: High Desert Power Plant is an operational natural-gas-fired combined-cycle facility in Victorville, San Bernardino County, with three Siemens gas turbines, three Alstom heat-recovery steam generators, and one Toshiba steam turbine. The California Energy Commission certified the project in 2000, and commercial operation began on April 22, 2003. Constellation developed the project, Tenaska acquired it in December 2006, and Middle River Power acquired the Tenaska-owned project in 2016; High Desert Power Project LLC remains the direct owner, with Partners Group as the indirect upstream owner following its 2025 acquisition of Middle River Power and its portfolio. Siemens-led turbine and generator upgrades between 2018 and 2023 increased output by more than 60 MW while reducing emissions and heat rate. — High Desert Power Plant | California Energy Commission · confidence: medium - Description: High Desert Power Plant is an operational natural-gas-fired combined-cycle facility in Victorville, San Bernardino County, with three Siemens gas turbines, three Alstom heat-recovery steam generators, and one Toshiba steam turbine. The California Energy Commission certified the project in 2000, and commercial operation began on April 22, 2003. Constellation developed the project, Tenaska acquired it in December 2006, and Middle River Power acquired the Tenaska-owned project in 2016; High Desert Power Project LLC remains the direct owner, with Partners Group as the indirect upstream owner following its 2025 acquisition of Middle River Power and its portfolio. Siemens-led turbine and generator upgrades between 2018 and 2023 increased output by more than 60 MW while reducing emissions and heat rate. — High Desert Power Plant: Empowering California | Middle River Power · confidence: medium - Quality notes: ["The CEC-certified project is listed at 830 MW, while other records identify approximately 850 MW, 852 MW of generator nameplate capacity, or an 885 MW aggregate; The buyer and Tenaska-linked seller are supported, but the exact closing date is not consistently reported.","Upgrade totals also differ: Middle River Power's timeline describes a 75 MW uprate, while its technical article describes output increases of up to 60 MW. The 2018 FD2-to-FD3 modification is separately identified as adding 12 MW per unit.","The USD 2.2 billion figure relates to Partners Group's acquisition of an 11-plant portfolio and Middle River Power at enterprise value; it is not a disclosed sale price for High Desert alone. No project-specific 2016 or 2025 sale consideration was identified.","The plant is listed as operational, and no retirement or full repowering event was identified in the cited records."] — High Desert Power Plant | California Energy Commission · confidence: high - Quality notes: ["The CEC-certified project is listed at 830 MW, while other records identify approximately 850 MW, 852 MW of generator nameplate capacity, or an 885 MW aggregate; The buyer and Tenaska-linked seller are supported, but the exact closing date is not consistently reported.","Upgrade totals also differ: Middle River Power's timeline describes a 75 MW uprate, while its technical article describes output increases of up to 60 MW. The 2018 FD2-to-FD3 modification is separately identified as adding 12 MW per unit.","The USD 2.2 billion figure relates to Partners Group's acquisition of an 11-plant portfolio and Middle River Power at enterprise value; it is not a disclosed sale price for High Desert alone. No project-specific 2016 or 2025 sale consideration was identified.","The plant is listed as operational, and no retirement or full repowering event was identified in the cited records."] — Source · confidence: high - Quality notes: ["The CEC-certified project is listed at 830 MW, while other records identify approximately 850 MW, 852 MW of generator nameplate capacity, or an 885 MW aggregate; The buyer and Tenaska-linked seller are supported, but the exact closing date is not consistently reported.","Upgrade totals also differ: Middle River Power's timeline describes a 75 MW uprate, while its technical article describes output increases of up to 60 MW. The 2018 FD2-to-FD3 modification is separately identified as adding 12 MW per unit.","The USD 2.2 billion figure relates to Partners Group's acquisition of an 11-plant portfolio and Middle River Power at enterprise value; it is not a disclosed sale price for High Desert alone. No project-specific 2016 or 2025 sale consideration was identified.","The plant is listed as operational, and no retirement or full repowering event was identified in the cited records."] — Source · confidence: high - Quality notes: ["The CEC-certified project is listed at 830 MW, while other records identify approximately 850 MW, 852 MW of generator nameplate capacity, or an 885 MW aggregate; The buyer and Tenaska-linked seller are supported, but the exact closing date is not consistently reported.","Upgrade totals also differ: Middle River Power's timeline describes a 75 MW uprate, while its technical article describes output increases of up to 60 MW. The 2018 FD2-to-FD3 modification is separately identified as adding 12 MW per unit.","The USD 2.2 billion figure relates to Partners Group's acquisition of an 11-plant portfolio and Middle River Power at enterprise value; it is not a disclosed sale price for High Desert alone. No project-specific 2016 or 2025 sale consideration was identified.","The plant is listed as operational, and no retirement or full repowering event was identified in the cited records."] — High Desert Power Plant: Empowering California | Middle River Power · confidence: high - Financing summary: Middle River Power's corporate timeline states that it raised a USD 270 million Term Loan B in October 2016 in connection with acquiring High Desert, Big Sandy, and Wolf Hills. High Desert was refinanced into standalone financing in November 2019. Middle River Power also reports closing a USD 750 million financing facility for its California portfolio in April 2022; a trade publication separately describes a USD 714 million Avenue Capital refinancing of the California fossil-generation portfolio with CIT as lead arranger, but the cited record does not establish whether the two amounts are the same facility. The USD 2.2 billion Partners Group transaction announced in March 2025 was portfolio enterprise value, not project financing or disclosed High Desert sale consideration. — Middle River Power | Leading the Energy Transition · confidence: medium - Financing summary: Middle River Power's corporate timeline states that it raised a USD 270 million Term Loan B in October 2016 in connection with acquiring High Desert, Big Sandy, and Wolf Hills. High Desert was refinanced into standalone financing in November 2019. Middle River Power also reports closing a USD 750 million financing facility for its California portfolio in April 2022; a trade publication separately describes a USD 714 million Avenue Capital refinancing of the California fossil-generation portfolio with CIT as lead arranger, but the cited record does not establish whether the two amounts are the same facility. The USD 2.2 billion Partners Group transaction announced in March 2025 was portfolio enterprise value, not project financing or disclosed High Desert sale consideration. — Avenue Capital closes Middle River refinancing - Proximo · confidence: medium - Commercial parties.0: {"relationship":"Direct owner","name":"High Desert Power Project LLC","detail":"Direct owner of the High Desert Power Project facility.","official_url":null} — High Desert Power Plant | California Energy Commission · confidence: high - Commercial parties.2: {"relationship":"Plant operator and asset manager","name":"Middle River Power","detail":"Operates and manages High Desert and acquired the project from the Tenaska-linked ownership group in 2016.","official_url":"https://middleriverpower.com"} — Middle River Power | Leading the Energy Transition · confidence: high - Commercial parties.8: {"relationship":"Construction contractor","name":"Kiewit Industrial Company","detail":"Identified in the project history as the company that began construction in May 2001.","official_url":"https://www.kiewit.com"} — CCGT for High Desert Power Project (HDPP), California - Power Technology · confidence: high - Commercial parties.9: {"relationship":"Gas-turbine OEM and upgrade provider","name":"Siemens Energy","detail":"Supplied the three gas turbines and later performed FD3 and FX performance upgrades, including emissions and efficiency improvements.","official_url":"https://www.siemens-energy.com"} — High Desert Power Plant | California Energy Commission · confidence: medium - Commercial parties.9: {"relationship":"Gas-turbine OEM and upgrade provider","name":"Siemens Energy","detail":"Supplied the three gas turbines and later performed FD3 and FX performance upgrades, including emissions and efficiency improvements.","official_url":"https://www.siemens-energy.com"} — High Desert Power Plant: Empowering California | Middle River Power · confidence: medium - Commercial parties.10: {"relationship":"Heat-recovery steam-generator OEM","name":"Alstom","detail":"Supplied the three heat-recovery steam generators in the CEC-certified configuration.","official_url":"https://www.alstom.com"} — High Desert Power Plant | California Energy Commission · confidence: high - Commercial parties.11: {"relationship":"Steam-turbine OEM","name":"Toshiba","detail":"Supplied the steam turbine identified in the CEC-certified configuration.","official_url":"https://www.global.toshiba"} — High Desert Power Plant | California Energy Commission · confidence: medium - Timeline.1: {"event":"Construction","date":"2001-05-01","detail":"Kiewit Industrial Company began construction after project financing was sufficiently advanced, according to the project history."} — CCGT for High Desert Power Project (HDPP), California - Power Technology · confidence: high - Timeline.2: {"event":"Commercial operation","date":"2003-04-22","detail":"The 830 MW natural-gas-fired combined-cycle facility began commercial operation."} — High Desert Power Plant | California Energy Commission · confidence: high - Timeline.5: {"event":"Acquisition financing","date":"2016-10","detail":"Middle River Power raised a USD 270 million Term Loan B related to its acquisition of High Desert, Big Sandy, and Wolf Hills."} — Middle River Power | Leading the Energy Transition · confidence: high - Timeline.6: {"event":"First turbine performance upgrade","date":"2018","detail":"Siemens modifications changed the turbines from FD2 to FD3 and added approximately 12 MW per unit, or about 36 MW in total."} — High Desert Power Plant: Empowering California | Middle River Power · confidence: high - Timeline.6: {"event":"First turbine performance upgrade","date":"2018","detail":"Siemens modifications changed the turbines from FD2 to FD3 and added approximately 12 MW per unit, or about 36 MW in total."} — Middle River Power | Leading the Energy Transition · confidence: high - Timeline.7: {"event":"Standalone refinancing","date":"2019-11","detail":"High Desert was refinanced into standalone financing, while Big Sandy and Wolf Hills were placed into a separate facility."} — Middle River Power | Leading the Energy Transition · confidence: high - Timeline.8: {"event":"California portfolio financing","date":"2022-04","detail":"Middle River Power reported closing a USD 750 million financing facility for its California portfolio."} — Middle River Power | Leading the Energy Transition · confidence: medium - Timeline.9: {"event":"CEC operating-condition modification","date":"2023-03-22","detail":"The CEC approved a modification to air-quality conditions to increase turbine firing temperature; the staff approval stated that no increase in facility emission limits was proposed."} — High Desert Power Project Statement of Staff Approval · confidence: high - Timeline.9: {"event":"CEC operating-condition modification","date":"2023-03-22","detail":"The CEC approved a modification to air-quality conditions to increase turbine firing temperature; the staff approval stated that no increase in facility emission limits was proposed."} — High Desert Power Plant | California Energy Commission · confidence: high - Timeline.10: {"event":"High Desert FX and emissions upgrade","date":"2023-06","detail":"Middle River Power's timeline identifies a High Desert FX upgrade producing a 75 MW uprate and decreased heat rate. The related Siemens/Middle River account describes up to 60 MW of total output gain, reduced NOx and carbon monoxide emissions, and improved heat rate."} — Middle River Power | Leading the Energy Transition · confidence: medium - Timeline.10: {"event":"High Desert FX and emissions upgrade","date":"2023-06","detail":"Middle River Power's timeline identifies a High Desert FX upgrade producing a 75 MW uprate and decreased heat rate. The related Siemens/Middle River account describes up to 60 MW of total output gain, reduced NOx and carbon monoxide emissions, and improved heat rate."} — High Desert Power Plant: Empowering California | Middle River Power · confidence: medium - Acquisition detail: On 2001-01-24, the California Energy Commission approved transfer of the project from High Desert Power Project LLC to High Desert Power Trust Ltd., while High Desert Power Project LLC retained construction and operating responsibilities. On 2016-04-07, affiliates of Tenaska Capital Management completed a portfolio sale that included the High Desert Power Project to an Avenue Capital affiliate. — TPF Genco – Generation Assets Sale | Tenaska Capital · confidence: medium - Seller: Affiliates of Tenaska Capital Management — TPF Genco – Generation Assets Sale | Tenaska Capital · confidence: medium - Prior owner: Affiliates of Tenaska Capital Management — TPF Genco – Generation Assets Sale | Tenaska Capital · confidence: medium - Acquirer: An affiliate of Avenue Capital — TPF Genco – Generation Assets Sale | Tenaska Capital · confidence: medium ## Timeline - 2000-05-03 — CEC certification The California Energy Commission certified the High Desert Power Project under Docket 97-AFC-01. Source: High Desert Power Plant | California Energy Commission (https://www.energy.ca.gov/powerplant/combined-cycle/high-desert-power-plant) - 2003-04-22 — Commercial operation The 830 MW natural-gas-fired combined-cycle facility began commercial operation. Source: High Desert Power Plant | California Energy Commission (https://www.energy.ca.gov/powerplant/combined-cycle/high-desert-power-plant) - 2016-10 — Acquisition financing Middle River Power raised a USD 270 million Term Loan B related to its acquisition of High Desert, Big Sandy, and Wolf Hills. Source: Middle River Power | Leading the Energy Transition (https://middleriverpower.com/) - 2018 — First turbine performance upgrade Siemens modifications changed the turbines from FD2 to FD3 and added approximately 12 MW per unit, or about 36 MW in total. Source: High Desert Power Plant: Empowering California | Middle River Power (https://middleriverpower.com/news/high-desert-power-plant-empowering-california/) - 2019-11 — Standalone refinancing High Desert was refinanced into standalone financing, while Big Sandy and Wolf Hills were placed into a separate facility. Source: Middle River Power | Leading the Energy Transition (https://middleriverpower.com/) - 2023-03-22 — CEC operating-condition modification The CEC approved a modification to air-quality conditions to increase turbine firing temperature; the staff approval stated that no increase in facility emission limits was proposed. Source: High Desert Power Plant | California Energy Commission (https://www.energy.ca.gov/powerplant/combined-cycle/high-desert-power-plant) - 2025-06 — Acquisition closed MRP Buyer, LLC acquired 100% equity interests in MRP Golden Development Finance Holdings, LLC (indirect upstream owner of High Desert Power Project LLC—direct owner of the 850 MW facility) on June 4, 2025. Upstream transaction that did not change direct owner or operational control. Consideration not disclosed. Source: Source (https://efiling.energy.ca.gov/GetDocument.aspx?tn=264203&DocumentContentId=100897) ## Sources - [Source](https://efiling.energy.ca.gov/GetDocument.aspx?tn=264203&DocumentContentId=100897) — efiling.energy.ca.gov · tier regulatory - [MBR | Index](https://mbrweb.ferc.gov/SearchlkpEIA/Index?page=270) — mbrweb.ferc.gov · tier regulatory - [Cross-Reference Table](https://www.energy.ca.gov/sites/default/files/2025-04/Energy_Commission_Power_Plant_ID_Cross_Reference_Table_2024.xlsx) — energy.ca.gov · tier regulatory - [High Desert Power Plant | California Energy Commission](https://www.energy.ca.gov/powerplant/combined-cycle/high-desert-power-plant) — energy.ca.gov · tier regulatory - [Non-Resource Adequacy Capacity Table - December 2024](https://www.caiso.com/documents/non-resource-adequacy-capacity-table-december-2024.xlsx) — caiso.com · tier other - [Curtailed and Non-Operational Generating Units](https://www.caiso.com/documents/curtailed-non-operational-generator-am-report-20151231.html) — caiso.com · tier other - [qfer eia caiso](https://www.sce.com/sites/default/files/inline-files/ExhibitC1_1_CECCaliforniaPowerPlants.xls) — sce.com · tier other - [High Desert Power Plant: Empowering California | Middle River Power](https://middleriverpower.com/news/high-desert-power-plant-empowering-california/) — middleriverpower.com · tier other - [High Desert Power Project in California begins commercial operation](https://www.power-eng.com/coal/high-desert-power-project-in-california-begins-commercial-operation/) — power-eng.com · tier other - [CCGT for High Desert Power Project (HDPP), California - Power Technology](https://www.power-technology.com/projects/hdpp/) — power-technology.com · tier other - [Source](https://energy.ca.gov/powerplant/combined-cycle/high-desert-power-plant) — energy.ca.gov · tier regulatory - [SGT6-5000F Heavy-duty gas turbine (60 Hz)](https://www.siemens-energy.com/global/en/home/products-services/product/sgt6-5000f.html) — siemens-energy.com · tier other - [Source](https://sce.com/sites/default/files/inline-files/ExhibitC1_1_CECCaliforniaPowerPlants.xls) — sce.com · tier other - [Middle River Power | Leading the Energy Transition](https://middleriverpower.com/) — middleriverpower.com · tier other - [Avenue Capital closes Middle River refinancing - Proximo](https://www.proximoinfra.com/news/48893/avenue-capital-closes-middle-river-refinancing) — proximoinfra.com · tier other - [High Desert Power Project Statement of Staff Approval](https://efiling.energy.ca.gov/GetDocument.aspx?tn=249395) — efiling.energy.ca.gov · tier regulatory - [TPF Genco – Generation Assets Sale | Tenaska Capital](https://tenaskacapital.com/tpf-genco-generation-assets-sale/) — tenaskacapital.com · tier other - [2026 NQC List](https://www.caiso.com/documents/net-qualifying-capacity-report-for-compliance-year-2026.xlsx) — caiso.com · tier other ## Data quality - The buyer and Tenaska-linked seller are supported, but the exact closing date is not consistently reported. Upgrade totals also differ: Middle River Power's timeline describes a 75 MW uprate, while its technical article describes output increases of up to 60 MW. The 2018 FD2-to-FD3 modification is separately identified as adding 12 MW per unit. The USD 2.2 billion figure relates to Partners Group's acquisition of an 11-plant portfolio and Middle River Power at enterprise value; it is not a disclosed sale price for High Desert alone. The plant is listed as operational, and no retirement or full repowering event was identified in the cited records. --- Canonical page: https://askthegrid.com/assets/facilities/high-desert-power-plant Source: Ask the Grid — https://askthegrid.com/