# Moss Landing Energy Storage Facility

**URL:** https://thecodex.expert/energy/storage/moss-landing/
**Codex:** The Energy Codex · Publisher: The Codex (Let Us Do It For U), Mumbai, India
**Section:** Enablers — Energy Storage
**Last verified:** June 2026
**Entry type:** asset · **Confidence:** high

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## Canonical definition

Moss Landing Energy Storage Facility is a large lithium-ion battery energy storage system (BESS) in Monterey County, California, USA, at GPS 36.8044° N, 121.7836° W, on the site of the former Moss Landing natural gas power plant. For several years after opening it was the largest battery storage facility in the world. The main facility is owned and operated by Vistra Corp at approximately 750 MW / 3,000 MWh, built in phases from 2020. A separate co-located system at the same site is owned by PG&E and uses Tesla Megapack batteries (~182.5 MW / 730 MWh). It stores electricity — typically charging from midday solar and discharging during the evening peak — to balance California's high-renewables grid. A major fire occurred in the Vistra building in January 2025, after smaller overheating events in 2021 and 2022.

## Key facts

- **Vistra capacity:** ~750 MW / ~3,000 MWh
- **PG&E/Tesla Megapack system:** ~182.5 MW / ~730 MWh
- **Duration:** ~4 hours
- **Chemistry:** Lithium-ion
- **First phase online:** December 2020
- **Site:** Former Moss Landing natural gas power plant (interconnection reused)
- **Operators:** Vistra Corp (main); PG&E with Tesla Megapack (co-located)

## Why it exists — the duck curve

California produces surplus solar at midday and faces a steep demand ramp at sunset. Moss Landing charges on cheap midday solar and discharges across the evening peak, reducing reliance on gas peaker plants and solar curtailment.

## How it works

Bidirectional inverters convert grid AC to battery DC to charge, and reverse to discharge. A Battery Management System monitors voltage, temperature and charge across thousands of modules; thermal management keeps cells safe. Response is sub-second, useful for both energy shifting and grid stability. Round-trip efficiency is roughly 85–90%.

## The fires

Smaller overheating events occurred in 2021 and 2022; a major fire in the Vistra building in January 2025 destroyed much of the structure and prompted local evacuations. These events became a defining safety case study, accelerating adoption of NFPA 855, wider unit spacing, and modular outdoor enclosures across the storage industry.

## India relevance

India is deploying utility-scale BESS to manage its rapid solar growth and evening peak, using the same ~4-hour model. The Central Electricity Authority projects substantial storage needs by 2030. Moss Landing is both the scale benchmark and a safety cautionary tale, arguing for strict fire codes in Indian projects from the outset.

## Risks

- **Fire / thermal runaway** — the defining Moss Landing concern.
- **Critical minerals** — lithium, nickel, cobalt sourcing.
- **Degradation & recycling** — finite cell life requiring augmentation and recycling.
- **Siting** — proximity to homes and the Elkhorn Slough estuary.

## Sources

- Vistra Corp (vistracorp.com) — owner/operator
- PG&E (pge.com) — co-located Elkhorn battery
- Tesla (tesla.com/megapack) — Megapack technology
- California Energy Commission (energy.ca.gov), US EIA (eia.gov) — capacity, location
- California ISO (caiso.com) — grid operations
- Monterey County (montereycountyca.gov) — incidents
- NFPA 855 — storage safety standard
- CEA (cea.nic.in), MNRE (mnre.gov.in) — India context

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*This page documents what named institutional sources record about Moss Landing. It is a record of documentation, not a recommendation. Figures are rounded and were last verified June 2026. Not engineering, financial, or policy advice. Verify at the linked primary source before relying on any number.*