Solar powered photo-voltaic (PV) cells are assembled by workers at a factory owned by the Himin Group, the worlds largest manufacturer of solar thermal water heaters, which is based in Dezhou, Shandong Province, China. Dezhou, a city of 5.5 million people, is known as China's 'Solar Valley'. More than 90% of all households in the city use solar thermal water heaters. Ten cities in China have made it compulsory, or offered subsidies, for under twelve storey civil-use buildings, including residential, restaurants, and hotels to install solar thermal water heaters..
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