In recent months the governments of Beijing and Shanghai started offering subsidies for BYD electric cars. Pictured, a BYD e6 vehicle on display. Reuters Despite being based in one of the world’s biggest and most polluted car markets, Chinese electric-car maker BYD Co. until recently sold few of its hybrid or battery-powered electric cars outside of its home province of Guangdong, thanks to a system of local subsidies. Those rules are now changing under a new effort by China’s central government to push local authorities to treat equally all Chinese car makers when granting green subsidies. This year for the first time, big cities are relaxing subsidy rules that effectively prevented sales of electric and hybrid cars by local manufacturers that weren’t based in their jurisdictions. Such restrictions had been a drag on green-car sales in China, particularly for BYD, a midsize manufacturer of cars, buses and batteries. In […]