"The world's largest solar energy office building opened on November 27 in Dezhou, Shangdong Province in northwest China. The building, which has a total area of 75,000 square meters, features exhibition centers, scientific research facilities, meeting and training facilities, and a hotel.
The design of the building is based on the sun dial and underlines the urgency of seeking renewable energy sources to replace fossil fuels. The design also features the Chinese characters for sun "日" and moon "月", and the color white predominates, symbolizing clean energy. ". Read more at http://www.china.org.cn/environment/2009-11/30/content_18979869.htm