Melrose BESS
San Diego Gas & Electric CompanySan Diego County
Overview
- Project power / energy
- 20 MW / 80 MWh
- 4-hour project design reported by the utility or supplier; power is MW and stored energy is MWh.
- Registry anchor
- Plant 66281
- plant-66281
Infrastructure record
- Mapped facility footprint
- Mapped infrastructure footprint
Mapped infrastructure geometry associated with this asset.
- In service
- 2024-03
Profile
- SDG&E role
- Utility owner and operator, rather than only a power purchaser or transmission neighbor.
Structured profile
- Technology
- Batteries
- Operator
- San Diego Gas & Electric Company
- Operating status
- Operating
Generation and physical site
EIA plant 66281 · Inventory for Aug 2026.
Reported operating nameplate by technology
- Battery storage
- 20 MW
Generator records (2)
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| 1 | Batteries | Operating | 10 | 10 |
| 2 | Batteries | Operating | 10 | 10 |
- Physical map location · OpenStreetMap
- 33.20708, -117.25290
- Filed location · EIA
- 33.20723, -117.25280
Sources and observation dates
Questions answered by the public record
Is Melrose BESS the same as the nearby Vista battery project?
Melrose is the SDG&E-owned 20 MW project at its Melrose Substation, with two 10 MW units. The 40 MW Vista battery described separately in the regulatory record is a different project.
When did Melrose BESS enter operation?
EIA’s August 2026 preliminary inventory records March 2024 for both Melrose generators. The CPUC’s February 2022 approval listed January 29, 2023 as a prospective project date; that earlier target is distinct from EIA’s later operating record.
Source: www.eia.gov exact-project record · as of 2026-08
Related assets
Similar plants ranked by technology, capacity, and distance.
Units and generators
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| 1 | 10 MW 10 MW summer | Batteries Electricity used for energy storage · BA | Mar 2024 | Operating |
| 2 | 10 MW 10 MW summer | Batteries Electricity used for energy storage · BA | Mar 2024 | Operating |
Performance
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Peer context
- Technology capacity
- 20 MW
- Batteries
- National rank
- #407
- of 1,061 operating peers
- CA rank
- #137
- of 272 operating peers
Monthly generation
Download CSVLatest 12 months
10.6 GWh
Reported gross generation
Latest report
Dec 2024
EIA-923 monthly filing
2024 net exchange
-2.4 GWh
Generation less station charging
Grid and market context
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Market registration
CAISO resource registrySettlement point
Commercial, land, and environmental record
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Transactions and agreements
Procurement Filing
Dec 14, 2021
SDG&E requested CPUC approval of two EPC contracts and one BOT contract for a total of 161 MW of utility-owned energy storage projects, including the 20 MW Melrose EPC contract with Fluence.
San Diego Gas & Electric Company
Regulatory Approval
Feb 10, 2022
The California Public Utilities Commission approved SDG&E's three utility-owned energy storage contracts totaling 161 MW, including the 20 MW, four-hour Melrose BESS EPC contract with Fluence.
California Public Utilities Commission · San Diego Gas & Electric Company · Fluence Energy, LLC
Project Notice
Aug 5, 2022
SDG&E notified residents of the Melrose Substation BESS project, describing the 20 MW / 80 MWh lithium iron phosphate storage system comprising 126 battery cubes and nodes, with expected construction from the end of August 2022 through summer 2023.
San Diego Gas & Electric Company
Related parties and identifiers
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
Relationship graph
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AssetOwner / operatorContractorMarket / regulatorRelated asset
Timeline and sources
Project milestones and public references behind the asset profile.
Project timeline
- SDG&E files Advice Letter 3913-E for utility-owned energy storage…docs.cpuc.c...
SDG&E requested CPUC approval of two EPC contracts and one BOT contract for a total of 161 MW of utility-owned energy storage projects, including the 20 MW Melrose EPC contract with Fluence.