Dark Sky Energy Center
Battery storage project in San Diego County, California. 7.3 MW of nameplate capacity across 1 generator, operated by San Diego Gas & Electric Co.
Also known as EIA plant 66599
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 7.3 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- July 2025First generator online
- Operator
- San Diego Gas & Electric CoEIA operator ID 16609
- Grid
- CAISOBalancing authority CISO
- Price nodes
- 1 CAISO nodeResource nodes with prices
- Location
- San Diego County, CA33.2705, −116.3470
- EIA plant ID
- 66599EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Dark Sky produces
Free · EIA-923Net generation, 2025
−224 MWh
−224 MWh, final
Battery discharge, 2025
1.37 GWh
Charge 1.60 GWh
January to July 2026
Not reported
Provisional. 0 of 7 months reported
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | Not reported | Not reported | 0 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | Not reported | Not reported | 0 of 12 |
| 2010 | Not reported | Not reported | 0 of 12 |
| 2011 | Not reported | Not reported | 0 of 12 |
| 2012 | Not reported | Not reported | 0 of 12 |
| 2013 | Not reported | Not reported | 0 of 12 |
| 2014 | Not reported | Not reported | 0 of 12 |
| 2015 | Not reported | Not reported | 0 of 12 |
| 2016 | Not reported | Not reported | 0 of 12 |
| 2017 | Not reported | Not reported | 0 of 12 |
| 2018 | Not reported | Not reported | 0 of 12 |
| 2019 | Not reported | Not reported | 0 of 12 |
| 2020 | Not reported | Not reported | 0 of 12 |
| 2021 | Not reported | Not reported | 0 of 12 |
| 2022 | Not reported | Not reported | 0 of 12 |
| 2023 | Not reported | Not reported | 0 of 12 |
| 2024 | Not reported | Not reported | 0 of 12 |
| 2025 | −224 | Not reported | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Battery plants can report negative net generation, when charging uses more energy than they discharge.
Power prices and basis
Free account · CAISOEmissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1 | Batteries | 7.3 | July 2025 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists San Diego Gas & Electric Co as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Power plants near Dark Sky
More plants operated by San Diego Gas & Electric Co
Questions about Dark Sky
How much power does Dark Sky Energy Center produce?
Dark Sky Energy Center reported −224 MWh (−224 MWh) of net generation in 2025.
Where is Dark Sky Energy Center?
Dark Sky Energy Center is in San Diego County, California, at 33.2705, −116.3470. It is in the California Independent System Operator balancing area (CISO).
Who operates Dark Sky Energy Center?
EIA-860M for August 2026 lists San Diego Gas & Electric Co as the operator (EIA operator ID 16609). The operator is not always the owner.
When did Dark Sky Energy Center start operating?
Its first generator began operating in July 2025, according to EIA-860M.
Does InfraMap have power prices for Dark Sky Energy Center?
Yes. InfraMap has CAISO day-ahead and real-time prices at 1 price node linked to Dark Sky Energy Center, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- CAISO day-ahead and real-time prices; node and hub assignments as of 2026-10-05
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page