HEFEI – October 21, 2026 -- Sungrow's PowerTitan 3.0 battery energy storage system contained a thermal runaway event that reached 1259.8°C without spreading to adjacent containers or a medium-voltage substation, becoming the first stacked-cell BESS with an AC-block design to complete a large-scale fire test under UL 9540A: 2026 and CSA/ANSI C800-2025.

UL Solutions conducted the test. Fire Risk Alliance witnessed it and Jensen Hughes observed it. All three PowerTitan generations, 1.0 through 3.0, passed their large-scale fire tests on the first attempt.