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Commercial batteryFortress Power

Fortress Power FP-Mega-Sxxx-O

261.2–418 kWh · 130.6–209 kW · Lithium Ion · 4 configurations

UL 1973CEC listed · Sep 21, 2026
  • Nameplate energy261.2–418 kWh
  • Continuous power130.6–209 kW
  • ChemistryLithium Ion

Overview

CEC Battery List

FP-Mega-Sxxx-O: 261.2–418 kWh nameplate energy; 130.6–209 kW continuous; lithium ion.

Models & configurations

CEC Battery List · 4 listings
ModelEnergyPowerGrid voltageRound tripCEC listed
FP-Mega-S260-O261.2 kWh———Sep 21, 2026
FP-Mega-S312-O313.5 kWh———Sep 21, 2026
FP-Mega-S364-O365.7 kWh———Sep 21, 2026
FP-Mega-S416-O418 kWh———Sep 21, 2026

Capacity & power

CEC Battery List

Safety listings

CEC Battery List

Sources

  1. California Energy Commission — Energy Storage System List, data as of Oct 7, 2026. Manufacturer-reported values confirmed by CEC against certificates.
  2. California Energy Commission — Battery List, data as of Oct 7, 2026.