California school district keeps finding new ways to save energy and other costs Nestled at the base of Mt. Diablo in the suburban East San Francisco Bay Area, Mt. Diablo Unified School District (MDUSD) is among California’s largest school districts. It consists of over 56 school sites and programs spread out over 150 square miles, including the cities of Concord, Pleasant Hill and Clayton, as well as portions of Walnut Creek and Martinez.

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