SHANGHAI—China disclosed new, multiyear subsidies and other inducements to get government officials and agencies to buy energy-efficient vehicles in a boost for plug-in electric and hybrid auto makers.

Under the new rules, which will be phased in over the next two years, battery-powered cars, gasoline-electric hybrids other new non-polluting vehicles must account for no less than 30% of all new cars bought for official use each year, according to a notice from the country's main economic planning agency, the Finance Ministry and three other government agencies.

Sunday's notice said subsidies will be offered to government and public agencies for purchases of vehicles that cost less than 180,000 yuan ($29,186), subsidies included. Local governments would be asked to build charging stations and other needed infrastructure, said the notice, which was posted on the government's website.

The Chinese government has been trying to promote use of new energy vehicles for the past five years, seeing them as a way to reduce pollution and as an emerging market that Chinese businesses might be able to conquer.

The government previously set a goal of having 500,000 plug-in hybrid and electric vehicles on the road by next year and five million by 2020, though it is far from meeting those targets. Sales of new energy vehicles reached 17,642 units last year, up around 38% year-over-year, according to the China Association of Automobile Manufacturers. By contrast, around 18 million passenger cars were sold in China last year.