Duke Energy may stop using NINGDE Era storage batteries, industry insiders say supply will be severely restricted. Recently, Duke Energy, a US utility company, said under pressure from the US Congress, it plans to stop using storage batteries produced by the Chinese manufacturer NINGDE Era at the largest Marine Corps base in the US, Camp Lejeune, and will gradually stop using NINGDE Era's battery products in civilian energy storage projects. Some industry insiders in the US have said that any attempt to avoid using Chinese storage batteries could severely restrict the supply of US utility operators.