# Elkhorn Battery Energy Storage System

CAISO asset profile · https://askthegrid.com/assets/facilities/elkhorn-battery-energy-storage-system

PG&E's 256-Megapack battery on Monterey Bay

Elkhorn is PG&E's 182.5 MW / 730 MWh four-hour battery at Moss Landing, built with 256 Tesla Megapacks. EIA listed the generator as out of service in June 2026; an April 2026 CPUC proposed decision said it had been offline since June 2, 2025, with no definitive return date reported by PG&E as of February 27, 2026.

## Profile

- **Operating status:** EIA coded the plant OA (out of service, expected to return) in June 2026. An April 2026 CPUC proposed decision said it had been offline since June 2, 2025, and PG&E had not reported a definitive return date as of February 27, 2026.

## Metrics

- **Storage:** 182.5 MW / 730 MWh — Four-hour EIA basis.
- **Megapacks:** 256 — PG&E exact-asset fire report.
- **Site:** ~4.5 acres — Project footprint.

## Facts

- **Owner / operator:** Pacific Gas and Electric
- **Equipment / construction:** Tesla
- **EIA June 2026 status:** OA — out of service, expected to return

## Related parties

- **Designer / constructor / supplier:** Tesla — PG&E exact-asset record ([source](https://www.pge.com/assets/pge/currents/safety/esrg-elkhorn-fire-report-09.2022.pdf))

## Sources

- [Elkhorn fire report](https://www.pge.com/assets/pge/currents/safety/esrg-elkhorn-fire-report-09.2022.pdf) — PG&E · official owner report — Exact equipment, site, role, milestone, and incident details.
- [April 2026 proposed decision](https://docs.cpuc.ca.gov/PublishedDocs/Published/G000/M604/K525/604525374.PDF) — CPUC · authoritative proposed decision — April 2026 outage status and the absence of a definitive return date.

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Canonical page: https://askthegrid.com/assets/facilities/elkhorn-battery-energy-storage-system
Website: [Pacific Gas and Electric Company](https://www.pge.com/)

Source: Ask the Grid — https://askthegrid.com/