# Diablo Energy Storage

CAISO Batteries · https://askthegrid.com/assets/facilities/diablo-energy-storage

Diablo Energy Storage is a battery energy storage facility with 200 MW of EIA-reported operating capacity and 800 MWh of reported energy capacity in Contra Costa County, California, registered as EIA Plant ID 62175. Diablo Energy Storage, LLC is the registered plant entity or operator. The facility interconnects at Pittsburg 230 kV Substation at 230 kV. Its grid role is transmission-connected, stand-alone lithium-ion battery energy-storage resource procured under PG&E system-reliability agreements, with a four-hour discharge duration.

## Key facts

- Technology: Batteries
- Power capacity: 200 MW
- Energy capacity: 800 MWh
- Operating status: operating

## Grid and market context

- ISO/RTO: CAISO
- Balancing authority: CISO (CAISO)
- Substation: Pittsburg 230 kV Substation
- Point of interconnection: Pittsburg 230 kV Substation
- Interconnection voltage: 230 kV

## Source-backed facts

- Owner logo domain: lspower.com — LS Power Diablo BESS • Sargent Electric Company · confidence: medium
- Owner logo domain: lspower.com — LS Power Energizes Largest Battery Storage Project in the World: the 250 MW Gateway Project in California - LS Power · confidence: medium
- Identifiers: [{"value":"62175","system":"EIA plant ID"},{"value":"DIBLO","system":"EIA generator ID"},{"value":"CISO","system":"EIA balancing authority"},{"value":"CAISO","system":"ISO/RTO market"},{"value":"ER21-1505-000","system":"FERC docket"}] — Federal Register :: Diablo Energy Storage, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization · confidence: medium
- Description: Diablo Energy Storage is an operational 200 MW lithium-ion battery energy storage project in Pittsburg, Contra Costa County, California. The plant has one operational battery generating unit identified as DIBLO and came online on April 1, 2022. Its point of interconnection is the Pittsburg 230 kV substation, and it participates in the CAISO market. — Source · confidence: medium
- Identifiers.4: {"value":"ER21-1505-000","system":"FERC docket"} — Federal Register :: Diablo Energy Storage, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization · confidence: medium
- Parties.0: {"relationship":"Owner","name":"LS Power","official_url":"https://www.lspower.com/"} — LS Power Diablo BESS • Sargent Electric Company · confidence: medium
- Parties.2: {"relationship":"EPC/general contractor","name":"Fluence Energy","official_url":"https://fluenceenergy.com/"} — LS Power Diablo BESS • Sargent Electric Company · confidence: high
- Parties.2: {"relationship":"EPC/general contractor","name":"Fluence Energy","official_url":"https://fluenceenergy.com/"} — Fluence Stands by its Work on the Diablo Plant, and Will Vigorously Pursue the Payments it is Owed for its Work and Dispute the Allegations in the Counterclaim Filed by the Operator of the Plant | Fluence · confidence: high
- Parties.3: {"relationship":"Prime electrical contractor","name":"Sargent Electric Company","official_url":"https://sargentelectric.com/"} — LS Power Diablo BESS • Sargent Electric Company · confidence: high
- Interconnection: Pittsburg 230 kV substation — Source · confidence: high
- Commercial operation date: 2022-04-01 — Source · confidence: medium
- Duration hours: 4 — Source · confidence: medium
- Energy mwh: 800 — Source · confidence: medium
- Construction scope: The 200 MW/approximately 800 MWh, 4-hour lithium-ion BESS in Pittsburg includes a 230 kV onsite substation and approximately 1.2 miles of underground/overhead gen-tie connection to PG&E’s Pittsburg substation. Sargent Electric’s documented scope included 34.5 kV underground construction, ground grid installation, below-grade duct banks, above-grade battery-cube assembly, DC and auxiliary power systems, and fiber-optic communications. No exact installed equipment-unit counts are disclosed in the cited project sources. — LS Power Diablo BESS • Sargent Electric Company · confidence: medium
- Product url: https://info.fluenceenergy.com/hubfs/Collateral/Gen6/Gridstack%20Tech%20Spec.pdf — Fluence Gridstack · confidence: medium
- Kind: bess — Source · confidence: high
- Construction scope: The 200 MW/approximately 800 MWh, 4-hour lithium-ion BESS in Pittsburg includes a 230 kV onsite substation and approximately 1.2 miles of underground/overhead gen-tie connection to PG&E’s Pittsburg substation. Sargent Electric’s documented scope included 34.5 kV underground construction, ground grid installation, below-grade duct banks, above-grade battery-cube assembly, DC and auxiliary power systems, and fiber-optic communications. No exact installed equipment-unit counts are disclosed in the cited project sources. — LS Power Diablo BESS • Sargent Electric Company · confidence: medium
- Construction scope: The 200 MW/approximately 800 MWh, 4-hour lithium-ion BESS in Pittsburg includes a 230 kV onsite substation and approximately 1.2 miles of underground/overhead gen-tie connection to PG&E’s Pittsburg substation. Sargent Electric’s documented scope included 34.5 kV underground construction, ground grid installation, below-grade duct banks, above-grade battery-cube assembly, DC and auxiliary power systems, and fiber-optic communications. No exact installed equipment-unit counts are disclosed in the cited project sources. — PowerPoint Presentation · confidence: medium
- Product url: https://info.fluenceenergy.com/hubfs/Collateral/Gen6/Gridstack%20Tech%20Spec.pdf — Fluence Gridstack · confidence: medium
- Manufacturer domain: fluenceenergy.com — Source · confidence: medium
- Equipment models: [{"manufacturer_domain":"catl.com","product_url":"https://www.catl.com/en/ess/","count":null,"unit_mw":null,"name":"CATL lithium iron phosphate (LFP) liquid-cooled batteries"},{"manufacturer_domain":"fluenceenergy.com","product_url":"https://info.fluenceenergy.com/hubfs/Collateral/Gen6/Gridstack%20Tech%20Spec.pdf","count":null,"unit_mw":null,"name":"Fluence Cube / sixth-generation technology stack enclosures"},{"manufacturer_domain":"power-electronics.com","product_url":"https://power-electronics.com/en/storage/pcsk-&-multi-pcsk","count":null,"unit_mw":null,"name":"Power Electronics battery inverter; exact project model not disclosed"}] — Source · confidence: medium
- Manufacturer name: Fluence Energy — Source · confidence: medium
- Equipment models.0: {"manufacturer_domain":"catl.com","product_url":"https://www.catl.com/en/ess/","count":null,"unit_mw":null,"name":"CATL lithium iron phosphate (LFP) liquid-cooled batteries"} — Source · confidence: medium
- Equipment models.1: {"manufacturer_domain":"fluenceenergy.com","product_url":"https://info.fluenceenergy.com/hubfs/Collateral/Gen6/Gridstack%20Tech%20Spec.pdf","count":null,"unit_mw":null,"name":"Fluence Cube / sixth-generation technology stack enclosures"} — Source · confidence: medium
- Equipment models.2: {"manufacturer_domain":"power-electronics.com","product_url":"https://power-electronics.com/en/storage/pcsk-&-multi-pcsk","count":null,"unit_mw":null,"name":"Power Electronics battery inverter; exact project model not disclosed"} — PCSK & Multi PCSK · confidence: medium
- Description: Diablo Energy Storage is a 200 MW lithium-ion battery energy storage facility in Pittsburg, Contra Costa County, California, connected at the Pittsburg 230 kV substation. REV Renewables lists Diablo as 100% owned with 200 MW of net capacity; REV was formed by LS Power as its renewables and storage platform. Diablo Energy Storage, LLC operates the facility, Fluence Energy served as EPC/general contractor, and Sargent Electric Company performed the prime electrical work. PG&E contracted for three 15-year resource-adequacy tranches totaling 150 MW. The project reached substantial completion and began CAISO participation in April 2022, although final completion remained unresolved because of an EPC dispute. — Source · confidence: medium
- Description: Diablo Energy Storage is a 200 MW lithium-ion battery energy storage facility in Pittsburg, Contra Costa County, California, connected at the Pittsburg 230 kV substation. REV Renewables lists Diablo as 100% owned with 200 MW of net capacity; REV was formed by LS Power as its renewables and storage platform. Diablo Energy Storage, LLC operates the facility, Fluence Energy served as EPC/general contractor, and Sargent Electric Company performed the prime electrical work. PG&E contracted for three 15-year resource-adequacy tranches totaling 150 MW. The project reached substantial completion and began CAISO participation in April 2022, although final completion remained unresolved because of an EPC dispute. — Current Facilities - REV | Renewables & Energy Storage · confidence: medium
- Description: Diablo Energy Storage is a 200 MW lithium-ion battery energy storage facility in Pittsburg, Contra Costa County, California, connected at the Pittsburg 230 kV substation. REV Renewables lists Diablo as 100% owned with 200 MW of net capacity; REV was formed by LS Power as its renewables and storage platform. Diablo Energy Storage, LLC operates the facility, Fluence Energy served as EPC/general contractor, and Sargent Electric Company performed the prime electrical work. PG&E contracted for three 15-year resource-adequacy tranches totaling 150 MW. The project reached substantial completion and began CAISO participation in April 2022, although final completion remained unresolved because of an EPC dispute. — LS Power Diablo BESS • Sargent Electric Company · confidence: medium
- Quality notes: ["The disclosed $300 million initial SK E&S investment and up-to-$400 million commitment were investments in the REV Renewables platform, not disclosed Diablo-specific sale consideration or project debt.","The 2025-12 agreement was reported as LS Power agreeing to acquire SK Innovation's remaining REV equity; the retrieved record does not establish the closing date or purchase consideration, so it should not be treated as a completed project sale.","Commercial-operation records differ by source: an EIA-derived record lists 2022-04-01, while WECC reports CAISO participation and substantial completion on 2022-04-30. April 2022 is the consistent month-level conclusion.","PG&E's public contracts cover 150 MW of the 200 MW facility, rather than the full plant capacity.","WECC reported that final completion had not been achieved as of 2026-02-09 because the site was in litigation with the EPC, with expected final completion listed as 2026-12-31."] — LS Power agrees to acquire remainder of REV Renewables... · confidence: medium
- Quality notes: ["The disclosed $300 million initial SK E&S investment and up-to-$400 million commitment were investments in the REV Renewables platform, not disclosed Diablo-specific sale consideration or project debt.","The 2025-12 agreement was reported as LS Power agreeing to acquire SK Innovation's remaining REV equity; the retrieved record does not establish the closing date or purchase consideration, so it should not be treated as a completed project sale.","Commercial-operation records differ by source: an EIA-derived record lists 2022-04-01, while WECC reports CAISO participation and substantial completion on 2022-04-30. April 2022 is the consistent month-level conclusion.","PG&E's public contracts cover 150 MW of the 200 MW facility, rather than the full plant capacity.","WECC reported that final completion had not been achieved as of 2026-02-09 because the site was in litigation with the EPC, with expected final completion listed as 2026-12-31."] — Source · confidence: medium
- Financing summary: Disclosed capital and construction amounts are distinct: SK E&S agreed on 2021-10-15 to invest up to $400 million in REV Renewables, with an initial $300 million investment for a 10.71% REV interest closing on 2021-12-09; this was a platform-level investment, not Diablo sale consideration. Separately, Diablo entered a $147.8 million Fluence EPC agreement in 2020 and exercised an expansion option in November 2020. Later litigation records described an EPC agreement valued at approximately $237.976 million and alleged approximately $229.107 million in payments, which are construction-contract figures rather than financing proceeds. — Fluence customer seeking refund for Diablo battery EPC work · confidence: medium
- Timeline: [{"event":"Interconnection agreement executed","date":"2017-11-16","detail":"The WECC progress report identifies November 16, 2017 as the date the Diablo interconnection agreement was executed."},{"event":"Municipal project approval process initiated","date":"2018-02-08","detail":"The City of Pittsburg issued a notice of intent for a battery storage project on an approximately 12-acre vacant site at 701 Willow Pass Road, with up to three buildings proposed."},{"event":"PG&E resource-adequacy contracts executed","date":"2020-05","detail":"PG&E disclosed three 15-year agreements with Diablo Energy Storage, LLC, each for 50 MW, totaling 150 MW; the public filing identified an initial delivery date of 2021-10-01."},{"event":"EPC agreement and expansion option","date":"2020","detail":"Diablo entered a $147.8 million EPC agreement with Fluence Energy for development of the battery facility."},{"event":"Expansion option exercised","date":"2020-11","detail":"The project company exercised an EPC option for Fluence to build an expansion of the Diablo battery storage facility."},{"event":"Asset contribution to REV Renewables","date":"2021-07-20","detail":"The owners contributed their interests in the battery storage facilities to REV Renewables, LLC as part of the formation and capitalization of the REV platform."},{"event":"Initial SK E&S platform investment closed","date":"2021-12-09","detail":"SK E&S's initial $300 million investment in REV closed in exchange for a 10.71% membership interest; the investment related to REV's broader portfolio, which included Diablo."},{"event":"Substantial completion and CAISO participation","date":"2022-04-30","detail":"WECC reported substantial completion and the start of CAISO market participation on April 30, 2022. An EIA-derived plant record separately lists commercial operation as April 1, 2022."},{"event":"EPC litigation began","date":"2023-10","detail":"Fluence filed a complaint concerning the supply and construction of the energy storage facility; Diablo later filed a cross-complaint seeking damages and recovery of amounts paid."},{"event":"Diablo cross-complaint against Fluence","date":"2023-11-10","detail":"Diablo Energy Storage, LLC filed a cross-complaint alleging defects, deficiencies, and failures and seeking at least $25 million in damages plus disgorgement of compensation paid to Fluence."},{"event":"Agreement to acquire remaining REV equity","date":"2025-12-01","detail":"LS Power was reported to have agreed to acquire the remaining REV Renewables equity held by SK Innovation, with Diablo identified among the REV assets. The retrieved record does not establish that the transaction had closed or disclose consideration."},{"event":"Expected final completion","date":"2026-12-31","detail":"WECC listed December 31, 2026 as the expected final-completion date, while noting that final completion had not yet been achieved because of the EPC litigation."}] — Source · confidence: medium
- Timeline: [{"event":"Interconnection agreement executed","date":"2017-11-16","detail":"The WECC progress report identifies November 16, 2017 as the date the Diablo interconnection agreement was executed."},{"event":"Municipal project approval process initiated","date":"2018-02-08","detail":"The City of Pittsburg issued a notice of intent for a battery storage project on an approximately 12-acre vacant site at 701 Willow Pass Road, with up to three buildings proposed."},{"event":"PG&E resource-adequacy contracts executed","date":"2020-05","detail":"PG&E disclosed three 15-year agreements with Diablo Energy Storage, LLC, each for 50 MW, totaling 150 MW; the public filing identified an initial delivery date of 2021-10-01."},{"event":"EPC agreement and expansion option","date":"2020","detail":"Diablo entered a $147.8 million EPC agreement with Fluence Energy for development of the battery facility."},{"event":"Expansion option exercised","date":"2020-11","detail":"The project company exercised an EPC option for Fluence to build an expansion of the Diablo battery storage facility."},{"event":"Asset contribution to REV Renewables","date":"2021-07-20","detail":"The owners contributed their interests in the battery storage facilities to REV Renewables, LLC as part of the formation and capitalization of the REV platform."},{"event":"Initial SK E&S platform investment closed","date":"2021-12-09","detail":"SK E&S's initial $300 million investment in REV closed in exchange for a 10.71% membership interest; the investment related to REV's broader portfolio, which included Diablo."},{"event":"Substantial completion and CAISO participation","date":"2022-04-30","detail":"WECC reported substantial completion and the start of CAISO market participation on April 30, 2022. An EIA-derived plant record separately lists commercial operation as April 1, 2022."},{"event":"EPC litigation began","date":"2023-10","detail":"Fluence filed a complaint concerning the supply and construction of the energy storage facility; Diablo later filed a cross-complaint seeking damages and recovery of amounts paid."},{"event":"Diablo cross-complaint against Fluence","date":"2023-11-10","detail":"Diablo Energy Storage, LLC filed a cross-complaint alleging defects, deficiencies, and failures and seeking at least $25 million in damages plus disgorgement of compensation paid to Fluence."},{"event":"Agreement to acquire remaining REV equity","date":"2025-12-01","detail":"LS Power was reported to have agreed to acquire the remaining REV Renewables equity held by SK Innovation, with Diablo identified among the REV assets. The retrieved record does not establish that the transaction had closed or disclose consideration."},{"event":"Expected final completion","date":"2026-12-31","detail":"WECC listed December 31, 2026 as the expected final-completion date, while noting that final completion had not yet been achieved because of the EPC litigation."}] — Diablo Energy Storage - Notice of Intent | News | City of Pittsburg · confidence: medium
- Timeline: [{"event":"Interconnection agreement executed","date":"2017-11-16","detail":"The WECC progress report identifies November 16, 2017 as the date the Diablo interconnection agreement was executed."},{"event":"Municipal project approval process initiated","date":"2018-02-08","detail":"The City of Pittsburg issued a notice of intent for a battery storage project on an approximately 12-acre vacant site at 701 Willow Pass Road, with up to three buildings proposed."},{"event":"PG&E resource-adequacy contracts executed","date":"2020-05","detail":"PG&E disclosed three 15-year agreements with Diablo Energy Storage, LLC, each for 50 MW, totaling 150 MW; the public filing identified an initial delivery date of 2021-10-01."},{"event":"EPC agreement and expansion option","date":"2020","detail":"Diablo entered a $147.8 million EPC agreement with Fluence Energy for development of the battery facility."},{"event":"Expansion option exercised","date":"2020-11","detail":"The project company exercised an EPC option for Fluence to build an expansion of the Diablo battery storage facility."},{"event":"Asset contribution to REV Renewables","date":"2021-07-20","detail":"The owners contributed their interests in the battery storage facilities to REV Renewables, LLC as part of the formation and capitalization of the REV platform."},{"event":"Initial SK E&S platform investment closed","date":"2021-12-09","detail":"SK E&S's initial $300 million investment in REV closed in exchange for a 10.71% membership interest; the investment related to REV's broader portfolio, which included Diablo."},{"event":"Substantial completion and CAISO participation","date":"2022-04-30","detail":"WECC reported substantial completion and the start of CAISO market participation on April 30, 2022. An EIA-derived plant record separately lists commercial operation as April 1, 2022."},{"event":"EPC litigation began","date":"2023-10","detail":"Fluence filed a complaint concerning the supply and construction of the energy storage facility; Diablo later filed a cross-complaint seeking damages and recovery of amounts paid."},{"event":"Diablo cross-complaint against Fluence","date":"2023-11-10","detail":"Diablo Energy Storage, LLC filed a cross-complaint alleging defects, deficiencies, and failures and seeking at least $25 million in damages plus disgorgement of compensation paid to Fluence."},{"event":"Agreement to acquire remaining REV equity","date":"2025-12-01","detail":"LS Power was reported to have agreed to acquire the remaining REV Renewables equity held by SK Innovation, with Diablo identified among the REV assets. The retrieved record does not establish that the transaction had closed or disclose consideration."},{"event":"Expected final completion","date":"2026-12-31","detail":"WECC listed December 31, 2026 as the expected final-completion date, while noting that final completion had not yet been achieved because of the EPC litigation."}] — Fluence customer seeking refund for Diablo battery EPC work · confidence: medium
- Timeline: [{"event":"Interconnection agreement executed","date":"2017-11-16","detail":"The WECC progress report identifies November 16, 2017 as the date the Diablo interconnection agreement was executed."},{"event":"Municipal project approval process initiated","date":"2018-02-08","detail":"The City of Pittsburg issued a notice of intent for a battery storage project on an approximately 12-acre vacant site at 701 Willow Pass Road, with up to three buildings proposed."},{"event":"PG&E resource-adequacy contracts executed","date":"2020-05","detail":"PG&E disclosed three 15-year agreements with Diablo Energy Storage, LLC, each for 50 MW, totaling 150 MW; the public filing identified an initial delivery date of 2021-10-01."},{"event":"EPC agreement and expansion option","date":"2020","detail":"Diablo entered a $147.8 million EPC agreement with Fluence Energy for development of the battery facility."},{"event":"Expansion option exercised","date":"2020-11","detail":"The project company exercised an EPC option for Fluence to build an expansion of the Diablo battery storage facility."},{"event":"Asset contribution to REV Renewables","date":"2021-07-20","detail":"The owners contributed their interests in the battery storage facilities to REV Renewables, LLC as part of the formation and capitalization of the REV platform."},{"event":"Initial SK E&S platform investment closed","date":"2021-12-09","detail":"SK E&S's initial $300 million investment in REV closed in exchange for a 10.71% membership interest; the investment related to REV's broader portfolio, which included Diablo."},{"event":"Substantial completion and CAISO participation","date":"2022-04-30","detail":"WECC reported substantial completion and the start of CAISO market participation on April 30, 2022. An EIA-derived plant record separately lists commercial operation as April 1, 2022."},{"event":"EPC litigation began","date":"2023-10","detail":"Fluence filed a complaint concerning the supply and construction of the energy storage facility; Diablo later filed a cross-complaint seeking damages and recovery of amounts paid."},{"event":"Diablo cross-complaint against Fluence","date":"2023-11-10","detail":"Diablo Energy Storage, LLC filed a cross-complaint alleging defects, deficiencies, and failures and seeking at least $25 million in damages plus disgorgement of compensation paid to Fluence."},{"event":"Agreement to acquire remaining REV equity","date":"2025-12-01","detail":"LS Power was reported to have agreed to acquire the remaining REV Renewables equity held by SK Innovation, with Diablo identified among the REV assets. The retrieved record does not establish that the transaction had closed or disclose consideration."},{"event":"Expected final completion","date":"2026-12-31","detail":"WECC listed December 31, 2026 as the expected final-completion date, while noting that final completion had not yet been achieved because of the EPC litigation."}] — LS Power agrees to acquire remainder of REV Renewables... · confidence: medium
- Timeline.0: {"event":"Interconnection agreement executed","date":"2017-11-16","detail":"The WECC progress report identifies November 16, 2017 as the date the Diablo interconnection agreement was executed."} — Source · confidence: high
- Timeline.1: {"event":"Municipal project approval process initiated","date":"2018-02-08","detail":"The City of Pittsburg issued a notice of intent for a battery storage project on an approximately 12-acre vacant site at 701 Willow Pass Road, with up to three buildings proposed."} — Diablo Energy Storage - Notice of Intent | News | City of Pittsburg · confidence: high
- Timeline.3: {"event":"EPC agreement and expansion option","date":"2020","detail":"Diablo entered a $147.8 million EPC agreement with Fluence Energy for development of the battery facility."} — Source · confidence: high
- Timeline.4: {"event":"Expansion option exercised","date":"2020-11","detail":"The project company exercised an EPC option for Fluence to build an expansion of the Diablo battery storage facility."} — Source · confidence: high
- Timeline.5: {"event":"Asset contribution to REV Renewables","date":"2021-07-20","detail":"The owners contributed their interests in the battery storage facilities to REV Renewables, LLC as part of the formation and capitalization of the REV platform."} — Source · confidence: medium
- Timeline.7: {"event":"Substantial completion and CAISO participation","date":"2022-04-30","detail":"WECC reported substantial completion and the start of CAISO market participation on April 30, 2022. An EIA-derived plant record separately lists commercial operation as April 1, 2022."} — Source · confidence: medium
- Timeline.8: {"event":"EPC litigation began","date":"2023-10","detail":"Fluence filed a complaint concerning the supply and construction of the energy storage facility; Diablo later filed a cross-complaint seeking damages and recovery of amounts paid."} — Fluence customer seeking refund for Diablo battery EPC work · confidence: high
- Timeline.9: {"event":"Diablo cross-complaint against Fluence","date":"2023-11-10","detail":"Diablo Energy Storage, LLC filed a cross-complaint alleging defects, deficiencies, and failures and seeking at least $25 million in damages plus disgorgement of compensation paid to Fluence."} — LS Power agrees to acquire remainder of REV Renewables... · confidence: medium
- Timeline.10: {"event":"Agreement to acquire remaining REV equity","date":"2025-12-01","detail":"LS Power was reported to have agreed to acquire the remaining REV Renewables equity held by SK Innovation, with Diablo identified among the REV assets. The retrieved record does not establish that the transaction had closed or disclose consideration."} — Source · confidence: high
- Commercial parties.0: {"relationship":"Owner/developer and REV platform sponsor","name":"LS Power","detail":"LS Power formed REV Renewables and is identified as the owner/developer associated with Diablo Energy Storage.","official_url":"https://www.lspower.com/"} — Current Facilities - REV | Renewables & Energy Storage · confidence: medium
- Commercial parties.0: {"relationship":"Owner/developer and REV platform sponsor","name":"LS Power","detail":"LS Power formed REV Renewables and is identified as the owner/developer associated with Diablo Energy Storage.","official_url":"https://www.lspower.com/"} — Powering the future. · confidence: medium
- Commercial parties.1: {"relationship":"Asset platform owner","name":"REV Renewables","detail":"REV's facilities listing identifies Diablo in Pittsburg as a 100%-owned REV asset with 200 MW of net capacity.","official_url":"https://www.revrenewables.com/"} — Current Facilities - REV | Renewables & Energy Storage · confidence: high
- Commercial parties.2: {"relationship":"Operator and registered market participant","name":"Diablo Energy Storage, LLC","detail":"Diablo Energy Storage, LLC operates the facility and participates in the CAISO market; no separate official corporate website was identified.","official_url":null} — Source · confidence: medium
- Commercial parties.3: {"relationship":"EPC/general contractor","name":"Fluence Energy","detail":"Fluence entered the Diablo EPC agreement covering design, engineering, procurement, installation, commissioning, and related project services.","official_url":"https://fluenceenergy.com/"} — LS Power Diablo BESS • Sargent Electric Company · confidence: high
- Commercial parties.3: {"relationship":"EPC/general contractor","name":"Fluence Energy","detail":"Fluence entered the Diablo EPC agreement covering design, engineering, procurement, installation, commissioning, and related project services.","official_url":"https://fluenceenergy.com/"} — Source · confidence: high
- Commercial parties.4: {"relationship":"Prime electrical contractor","name":"Sargent Electric Company","detail":"Sargent Electric performed the prime electrical work, including 34.5 kV underground construction, battery-cube assembly, DC power systems, auxiliary power, and fiber-optic communications.","official_url":"https://sargentelectric.com/"} — LS Power Diablo BESS • Sargent Electric Company · confidence: high
- Commercial parties.7: {"relationship":"Reported seller of remaining REV equity","name":"SK Innovation","detail":"A December 2025 report identified SK Innovation as the seller of the remaining REV Renewables equity that LS Power agreed to acquire; the retrieved record does not establish closing or consideration.","official_url":"https://www.skinnovation.com/"} — LS Power agrees to acquire remainder of REV Renewables... · confidence: medium

## Timeline

- 2017-11-16 — Interconnection agreement executed
  The WECC progress report identifies November 16, 2017 as the date the Diablo interconnection agreement was executed.
  Source: Source (https://www.wecc.org/sites/default/files/documents/progress_report/2026/Diablo%20Energy%20Storage%202026%20APR.pdf)
- 2018-02-08 — Municipal project approval process initiated
  The City of Pittsburg issued a notice of intent for a battery storage project on an approximately 12-acre vacant site at 701 Willow Pass Road, with up to three buildings proposed.
  Source: Diablo Energy Storage - Notice of Intent | News | City of Pittsburg (https://www.pittsburgca.gov/Home/Components/News/News/2028/)
- 2020-05 — PG&E resource-adequacy contracts executed
  PG&E disclosed three 15-year agreements with Diablo Energy Storage, LLC, each for 50 MW, totaling 150 MW; the public filing identified an initial delivery date of October 1, 2021.
  Source: May 18, 2020 Advice 5826-E Public Utilities Commission of the State of California Subject: System Reliability Contracts Resulting from PG&E’s (https://www.pge.com/tariffs/assets/pdf/adviceletter/ELEC_5826-E.pdf)
- 2021-07-20 — Asset contribution to REV Renewables
  The owners contributed their interests in the battery storage facilities to REV Renewables, LLC as part of the formation and capitalization of the REV platform.
  Source: Source (https://www.sec.gov/Archives/edgar/data/1891367/000119312522009952/d170629ds1.htm)
- 2022-04-01 — Commercial operation
  Diablo Energy Storage entered commercial operation.
  Source: Source (https://www.panc.org/wp-content/uploads/2022/07/2022-07-11-PANC-Diablo-Storage-tour.pdf)
- 2023-10 — EPC litigation began
  Fluence filed a complaint concerning the supply and construction of the energy storage facility; Diablo later filed a cross-complaint seeking damages and recovery of amounts paid.
  Source: Fluence customer seeking refund for Diablo battery EPC work (https://www.energy-storage.news/fluence-customer-seeking-refund-for-diablo-bess-epc-contract-citing-defects-and-chronic-failures/)
- 2023-11-10 — Diablo cross-complaint against Fluence
  Diablo Energy Storage, LLC filed a cross-complaint alleging defects, deficiencies, and failures and seeking at least $25 million in damages plus disgorgement of compensation paid to Fluence.
  Source: Fluence customer seeking refund for Diablo battery EPC work (https://www.energy-storage.news/fluence-customer-seeking-refund-for-diablo-bess-epc-contract-citing-defects-and-chronic-failures/)
- 2026-12-31 — Expected final completion
  WECC listed December 31, 2026 as the expected final-completion date, while noting that final completion had not yet been achieved because of the EPC litigation.
  Source: Source (https://www.wecc.org/sites/default/files/documents/progress_report/2026/Diablo%20Energy%20Storage%202026%20APR.pdf)

## Sources

- [LS Power Diablo BESS • Sargent Electric Company](https://sargentelectric.com/project/ls-power-diablo-bess/) — sargentelectric.com · tier other
- [LS Power Energizes Largest Battery Storage Project in the World: the 250 MW Gateway Project in California - LS Power](https://www.lspower.com/news/ls-power-energizes-largest-battery-storage-project-in-the-world-the-250-mw-gateway-project-in-california-2/) — lspower.com · tier other
- [Federal Register :: Diablo Energy Storage, LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization](https://www.federalregister.gov/documents/2021/03/30/2021-06506/diablo-energy-storage-llc-supplemental-notice-that-initial-market-based-rate-filing-includes-request) — federalregister.gov · tier regulatory
- [Source](https://www.wecc.org/sites/default/files/documents/progress_report/2026/Diablo%20Energy%20Storage%202026%20APR.pdf) — wecc.org · tier other
- [Fluence Stands by its Work on the Diablo Plant, and Will Vigorously Pursue the Payments it is Owed for its Work and Dispute the Allegations in the Counterclaim Filed by the Operator of the Plant | Fluence](https://ir.fluenceenergy.com/news-releases/news-release-details/fluence-stands-its-work-diablo-plant-and-will-vigorously-pursue) — ir.fluenceenergy.com · tier other
- [Diablo Energy Storage - Notice of Intent | News | City of Pittsburg](https://www.pittsburgca.gov/Home/Components/News/News/2028/) — pittsburgca.gov · tier regulatory
- [Battery Storage presentation for Power ...](https://www.panc.org/wp-content/uploads/2022/07/2022-07-11-PANC-Diablo-Storage-tour.pdf) — panc.org · tier other
- [Case 1:25-cv-00634 Document 1 Filed 04/15/25 Page 1 of 41 PageID# 1](https://www.rgrdlaw.com/media/cases/1080_complaint.pdf) — rgrdlaw.com · tier other
- [Fluence Gridstack](https://info.fluenceenergy.com/hubfs/Collateral/Gen6/Gridstack%20Tech%20Spec.pdf) — info.fluenceenergy.com · tier other
- [PowerPoint Presentation](https://panc.org/wp-content/uploads/2022/07/2022-07-11-PANC-Diablo-Storage-tour.pdf) — panc.org · tier other
- [Current Facilities - REV | Renewables & Energy Storage](https://www.revrenewables.com/facilities/) — revrenewables.com · tier other
- [PCSK & Multi PCSK](https://power-electronics.com/en/storage/pcsk-&-multi-pcsk) — power-electronics.com · tier other
- [LS Power Diablo BESS • Sargent Electric Company](https://www.sargentelectric.com/project/ls-power-diablo-bess/) — sargentelectric.com · tier other
- [May 18, 2020 Advice 5826-E Public Utilities Commission of the State of California Subject: System Reliability Contracts Resulting from PG&E’s](https://www.pge.com/tariffs/assets/pdf/adviceletter/ELEC_5826-E.pdf) — pge.com · tier other
- [Source](https://www.sec.gov/Archives/edgar/data/1891367/000119312522009952/d170629ds1.htm) — sec.gov · tier regulatory
- [LS Power agrees to acquire remainder of REV Renewables ...](https://newprojectmedia.com/ls-power-agrees-to-acquire-remainder-of-rev-renewables-from-sk/) — newprojectmedia.com · tier other
- [Fluence customer seeking refund for Diablo battery EPC work](https://www.energy-storage.news/fluence-customer-seeking-refund-for-diablo-bess-epc-contract-citing-defects-and-chronic-failures/) — energy-storage.news · tier other
- [Powering the future.](https://www.lspower.com/wp-content/uploads/2024-LS-Power-Annual-Report.pdf) — lspower.com · tier other

## Data quality

- The disclosed $300 million initial SK E&S investment and up-to-$400 million commitment were investments in the REV Renewables platform, not disclosed Diablo-specific sale consideration or project debt. The December 2025 agreement was reported as LS Power agreeing to acquire SK Innovation's remaining REV equity; the retrieved record does not establish the closing date or purchase consideration, so it should not be treated as a completed project sale. April 2022 is the consistent month-level conclusion. PG&E's public contracts cover 150 MW of the 200 MW facility, rather than the full plant capacity. WECC reported that final completion had not been achieved as of February 9, 2026 because the site was in litigation with the EPC, with expected final completion listed as December 31, 2026.

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