JAKARTA — China is starting to build its largest offshore wind-power facility in the latest move in an accelerating shift in Asia away from solar to wind and other renewable energy sources. Work began in late October on the facility off Nanpeng Isle in China’s southern Guangdong Province. The project has a planned capacity of 400,000 kilowatts, and its developer, China General Nuclear Power Corporation, expects it to generate about 1.46 billion kilowatt hours of power annually when it goes on stream in 2020 Wood Mackenzie, an energy consultancy, sees wind-generated capacity in the region growing by a factor of 20 over the next decade, powered by Beijing’s plans for a 15-fold expansion. Guangdong plans to build 23 offshore wind farms by 2030, according to China’s official Xinhua News Agency. Meanwhile, Asia’s solar-powered electricity capacity is set to fall this year for the first time since 2001, as countries such as China cut subsidies.