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The city now mandates the incorporation of solar panels in all new buildings, and oversees the construction process to ensure the panels are correctly installed.[2] The effort to install solar water heaters began in 1992. As of 2007, 99 percent of households in the central districts use solar water heaters, and most of the lighting and traffic signals are powered with photovoltaic solar power. In 2007 the city had over a half-milion square meters of solar water heating panels, equivalent to .5 megawatts of electric water heaters. The city has been designated as the Environmental Protection Model City by China's SEPA, and is consistently listed in the top 10 cities for air quality in China.[1]
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