Zimbabwe’s plan to refurbish two idled coal-fired power stations has been thrown into disarray by China’s decision to ban investment in plants burning the dirtiest fossil fuel outside its borders. Zimbabwe was depending on China to help get the Bulawayo Power Station, which has a design capacity of 90 megawatts, and Munyati Power Station, meant to generate 100 megawatts, to produce electricity to fill a chronic shortfall in the southern African country.