SAN FRANCISCO - Duke Energy Corp has signed a clean energy technology agreement with China's ENN Group, adding to a deal it struck last month with the country's top power provider in Duke's push to cut carbon emissions.

The deal between Duke and ENN, a private Chinese energy company, includes potential U.S. solar projects and joint technology developments in areas such as biofuels, coal-based clean energy and efficiency, the companies said on Wednesday.

Duke, the third-largest U.S. electricity company by power sales, said China led the world in clean energy investment.

We must move at 'China speed' to combat global warming, Duke Chief Executive Jim Rogers said in a statement. Rogers had talked last week of developing more technology with Chinese companies.

ENN Chairman Wang Yusuo said his group was one of China's largest natural gas suppliers and had growing subsidiaries around the world involved in renewable energy and zero-emission coal-based power and carbon-capture technology.

China and the United States lead the world in greenhouse gas emissions.

Duke, which is also the third-largest U.S. generator of electricity from coal, agreed last month to work with utility China Huaneng Group to explore technologies for cleaner emissions by coal-fired plants.

(Reporting by Braden Reddall, Editing by Maureen Bavdek)

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