China’s utilities will be required to buy all the power produced by wind farms and other renewable sources under a new law meant to promote the industry and reduce heavy reliance on coal.

Legislators approved the measure Saturday as an amendment to China’s 2006 renewable energy law, Xinhua news agency said.

Beijing has set ambitious goals for wind, solar and other renewable energy in an effort to clean up its environment and curb surging demand for imported oil and gas, which communist leaders see as a strategic weakness.

The measure also could help Beijing fulfill promises to restrain growth in emissions of carbon dioxide and other gases blamed for changing the climate.

“The legislation on improving the consumption of clean energy contributes to the global fight on climate change,” said Wang Zhongying (王仲穎), director of the renewable energy development center of the Cabinet’s main planning agency, Xinhua said.

Other countries such as Germany and Spain also promote solar, wind and other renewable power sources by requiring utilities to buy it and to pay higher prices than for electricity from coal and other traditional sources.

Xinhua gave no details of pricing but said companies that operate China’s power grid could be fined if they refuse to buy renewable power, which suggested the cost might be higher. It said grid operators would be required to improve their technology and capacity to absorb power from renewable sources.

China is one of the biggest users of wind power and the government is trying to promote use of solar by promising to pay up to 70 percent of the cost of new systems.

China faces the challenge that its windiest areas are far from populous cities, requiring costly transmission lines that in many areas have yet to be built. Wind farm construction has raced ahead so fast that 25 percent are not connected to the national power grid.

Government goals issued in 2005 call for at least 15 percent of China’s power to come from wind, solar and hydropower by 2020, up from 9 percent now. Officials say that target may be raised to 20 percent because the industry is developing so fast.

Meanwhile, South Korea, Asia’s fourth-biggest polluter, said it would blend more biodiesel next year as part of efforts to diversify fuel sources, cope with climate change and promote agricultural production.

The blending ratio for biodiesel, made from materials such as used cooking oil and animal fats, into diesel will rise to 2 percent next year from 1.5 percent now, the Ministry of Knowledge Economy said in an e-mailed statement yesterday.