XINING, June 12 (Xinhua) -- Northwest China's Qinghai Province started a 15-day all clean energy power supply project following a successful nine-day trail last year, the State Grid Qinghai Electric Power Company announced on Wednesday.

The province plans to only use green energy sources to generate electricity from June 9 to 23 to promote the use of clean energy.

Qinghai is the source of China's three major rivers, the Yellow, Yangtze and Lancang, and has strong hydro and solar-power facilities to serve the province's 5.8 million people.

"This year, Qinghai's electric grid will be expanded, with an installed capacity of 2.4 million kilowatts, up 50 percent from last year's trail," said Qi Taiyuan, general manager of the company.

Last year, from June 20 to 28, the province ran entirely on renewable energy, using wind, solar, and hydropower.

According to the provincial 13th five-year plan, Qinghai will expand its solar and wind capacity to 35 million kilowatts by 2020 and supply 110 billion kilowatt hours of clean electricity every year to central and eastern parts of China, preventing the burning of 50 million tonnes of coal.

China's enthusiasm for clean energy is pushing the world to transition toward a low-carbon future, with plans to invest 2.5 trillion yuan (370 billion U.S. dollars) in renewable energy by 2020, creating more than 13 million jobs, according to the National Energy Administration.