Coal stocks are critically low at three power stations supplying half of Guangdong's electricity, and further power rationing is looming. An official of Guangdong Power, the company operating the plants in Zhuhai, Huangpu and Shajiao, blamed a fall in production, a rise in prices and transport problems. The central government ordered the closure of all small coal mines after a string of accidents in Shanxi province in August killed more than 90 people. Only half have been allowed to reopen. The railways are overburdened and shipowners, rather than running scheduled services, are waiting until ships are fully laden. In Dongguan, which has a heavy concentration of Taiwanese investment, demand for power has exceeded supply by 30 per cent all year, and most factories have experienced rolling blackouts for one day, or part of one day, a week. Guangdong has generating capacity of around 215,000 megawatts, and industry sources say 5,000 megawatts should have been added in the past two years. Meanwhile, Hangzhou, the capital of Zhejiang province, expects power shortages of 400 to 600 megawatts a day this winter, and officials say next year will be worse.