Here's a bit more about the methodology from Bloomberg:
The accounting firm compared regulations, access to capital, availability of land, planning barriers, subsidies and access to the power-delivery grid when determining the ranking, which started in 2003.
“China has all the benefits of capital, government will, and it’s a massive market,” Ben Warren, Ernst & Young’s environment and energy infrastructure advisory leader, said in a telephone interview. “We would expect to see China retaining a dominant position.”
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Passing a comprehensive energy bill (apparently a lost hope for 2010) would have helped, and still could.
Image: Solar panels in Kunming (cc) by Flickr user Matthijs Koster