SK On completes UL 9540A ESS safety certification with large fire test

SK On said its energy storage systems passed the UL 9540A evaluation, including the Large Scale Fire Test under stricter requirements in effect since March. A fire in one container did not trigger thermal runaway in adjacent containers.

• UL 9540A certification confirmed with the Large Scale Fire Test
• Fire-spread requirements were tightened in March 2026
• In August SK On signed an LFP battery supply deal with NeoVolta Power
• SK On won 284 MW of 565 MW in Korea's central contract market