Big Rock Solar Farm
Gore Street Energy Storage Fund plcImperial County
Big Rock Solar Farm is a battery energy storage facility with 200 MW of EIA-reported operating capacity and 400 MWh of reported energy capacity in Imperial County, California, registered as EIA Plant ID 64636. Gore Street Energy Storage Fund plc is the current owner; Big Rock ESS Assets, LLC is the registered plant entity or operator. The facility uses LS Energy Solutions AiON-ESS Energy Series and AiON-SIS equipment; public project records list 137 battery containers.
Mapped infrastructure geometry associated with this asset.
Batteries
2-hour storage duration
Big Rock Solar Farm is operating.
230 kV · Imperial Irrigation District (IID)
EIA plant 64636 · Inventory for Sep 2026.
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| 92JTB | Batteries | Operating | 200 | 200 |
| 92JT8 | Solar Photovoltaic | canceled_or_postponed | 200 | Unknown |
The Laurel Cluster water-supply assessment described multiple transmission alternatives, including IID’s Fern Substation and SDG&E’s Imperial Valley Substation. An alternative in an early planning document is not confirmation of the final battery project’s interconnection or power buyer.
Similar plants ranked by technology, capacity, and distance.
Current generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| 92JTB | 200 MW 200 MW summer | Batteries BA | May 2025 | Operating |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
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Project milestones and public references behind the asset profile.
Gore Street Energy Storage Fund plc announced that it had agreed to acquire the 200 MW/400 MWh Big Rock project in Imperial County from Avantus, formerly 8minute. The announcement characterized the project acquisition costs, including capex around closing, development fees, and milestone payments, as approximately $110 million.
CAISO
CAISO · Imperial County
EIA-923 reports gross generation and net grid exchange for storage plants. Gross generation is shown as a discharge proxy; it is not a cycle count or conventional capacity factor.
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
LS Energy Solutions announced that Big Rock would use 137 AiON-ESS units, with LS-ES providing commissioning support and operational services. Construction was expected to begin shortly, with commercial operation then expected in the second half of 2024.
EIA-860 lists generator 92JTB with this operating date.
LS Energy Solutions announced that commercial operations had commenced at Big Rock in Imperial County. The project was providing resource adequacy and ancillary services for CAISO, with 137 AiON-ESS containers and 100 MW of deliverability used to supply 400 MWh under the four-hour RA requirement.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
The Laurel Cluster water-supply assessment described multiple transmission alternatives, including IID’s Fern Substation and SDG&E’s Imperial Valley Substation. An alternative in an early planning document is not confirmation of the final battery project’s interconnection or power buyer.
Big Rock Solar Farm reports 200 MW battery storage of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Sep 2026.
Big Rock Solar Farm is a batteries facility in Imperial County, CA, participating in the CAISO market.
Big Rock Solar Farm is in Imperial County, CA, inside the CAISO balancing area.
Big Rock Solar Farm is operated by Big Rock ESS Assets, LLC according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Big Rock Solar Farm reported 140.7 GWh over the twelve months to 2026-07. For a storage plant this is reported gross generation — a discharge proxy, not a cycle count or a conventional capacity factor.
Big Rock Solar Farm interconnects at Imperial Valley Substation, on the Imperial Irrigation District (IID) system.
By capacity, Big Rock Solar Farm ranks #58 of 1,061 operating plants of the same technology nationally. It ranks #15 of 272 in CA.
Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.