The re-ignition of about 1,200 charged, inaccessible modules at Vistra's Moss Landing 300 BESS on 18 September 2026 is usually reported as a late flare-up. This article treats it as a stranded-energy problem: once the electrical discharge path is destroyed, stored energy leaves only by combustion, chemical neutralisation or physical removal. Using LG Energy Solution and US EPA figures, it estimates average module energy (~12 kWh), the nameplate energy of the modules that ignited (~14.5 MWh), and the effective de-energising rate since removal began (~58 kW against a 300 MW rating). A simple removal-time model shows the tail is set by compartment size, access time and removal rate — design and contract parameters rather than chemistry. The article closes on procurement specifications for South Africa's BESIPPPP.
Sources
- US EPA news releases: 23 Jul 2025 (ASAOC with Vistra); 29 Sep 2025 (removal oversight begins); 8 Sep 2026 (final phase; nearly 40,000 intact modules removed; mid-2027 completion). EPA fact sheet, Moss Landing Vistra Battery Fire Cleanup, July 2026
- Vistra, mosslandingresponse.com (approximately 1,200 intact modules remaining, September 2026)
- LG Energy Solution, TR1300 Operational at World's Largest Utility-Scale Battery Energy Storage Project, 16 Jun 2021
- NTSB Safety Report SR-20/01, Safety Risks to Emergency Responders from Lithium-Ion Battery Fires in Electric Vehicles (2020)
- EPRI, PNNL and TWAICE, analysis of the EPRI BESS Failure Incident Database (May 2024)
- City of La Verne, Metropolitan Water District Weymouth plant battery incident updates, 22–25 Sep 2026
- Department of Electricity and Energy / DBSA, BESIPPPP Bid Window 3 preferred bidders, 30 May 2025; BW1 (Nov 2023) and BW2 (Dec 2024) announcements