California-based eSolar Inc. will provide Shandong Penglai Electric Power Equipment Manufacturing Co. with the technology and information to build the concentrated solar thermal power farms with a capacity totaling 2,000 megawatts.
The $5 billion investment would be the largest such project in China, though the companies didn't say who would be investing how much.
"This is a huge jump for China," said Deborah Seligsohn, director of the China climate program for the U.S-based World Resources Institute. "That amount suggests a number of commercial plants."
Interest in China as a solar energy market is growing quickly as the government looks for alternatives to coal. Saturday's deal comes four months after the largest solar panel maker in the U.S., First Solar, struck a tentative deal to build a massive solar field in China.
The eSolar deal is for concentrated solar thermal power - not the traditional image of vast farms of solar panels, but a system of taking what essentially are mirrors and focusing them to heat water to create steam to power a generator.
"There's room in the world for both systems, and we need both," Seligsohn said.
China is moving much faster than the U.S. in solar power development, eSolar officials said.
"This is an excellent example of what we all must do to fight climate change," Merrick Kerr, eSolar's chief financial officer, told a news conference Saturday in Beijing.
The first solar plant under the deal will be in Yulin city in the central province of Shaanxi.