Sierra Estrella Energy Storage
Battery storage project in Maricopa County, Arizona. 250 MW of nameplate capacity across 1 generator, operated by Sierra Estrella Energy Storage, LLC.
Also known as Sierra Estrella Energy Storage Facility · EIA plant 66334
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 250 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- May 2024First generator online
- Operator
- Sierra Estrella Energy Storage, LLCEIA operator ID 65418
- Grid
- SRPBalancing authority SRP
- Price nodes
- None linkedNo verified ISO node
- Location
- Maricopa County, AZ33.4108, −112.3138
- EIA plant ID
- 66334EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Sierra Estrella Energy Storage produces
Free · EIA-923Net generation, 2025
−42.2 GWh
−42,209 MWh, final
Battery discharge, 2025
365 GWh
Charge 407 GWh
January to July 2026
−21.2 GWh
Provisional
| 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 | −26,249 | Not reported | 8 of 12 |
| 2025 | −42,209 | Not reported | 12 of 12 |
| 2026 (provisional, partial year) | −21,227 | Not reported | 7 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 accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
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 |
|---|---|---|---|
| BESS3 | Batteries | 250.0 | May 2024 |
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 Sierra Estrella Energy Storage, LLC 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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Questions about Sierra Estrella Energy Storage
How much power does Sierra Estrella Energy Storage produce?
Sierra Estrella Energy Storage reported −42,209 MWh (−42.2 GWh) of net generation in 2025. From January to July 2026 it reported −21.2 GWh, which is provisional.
Where is Sierra Estrella Energy Storage?
Sierra Estrella Energy Storage is in Maricopa County, Arizona, at 33.4108, −112.3138. It is in the Salt River Project balancing area (SRP).
Who operates Sierra Estrella Energy Storage?
EIA-860M for August 2026 lists Sierra Estrella Energy Storage, LLC as the operator (EIA operator ID 65418). The operator is not always the owner.
When did Sierra Estrella Energy Storage start operating?
Its first generator began operating in May 2024, according to EIA-860M.
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)
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page