In recent years, when extreme summer heat has seen electricity demand peak, manufacturers in southern China’s Guangdong province have asked the same question: will power shortages return?In 2021 and 2022, China’s small and medium-sized manufacturers were hit by power shortages that triggered production curbs and factory shutdowns, disrupting supply chains in sectors ranging from electronics to metals. Tight coal supply and surging overseas orders all contributed to the shortages.This summer,...