How can existing schools significantly reduce their energy use? With energy costs rising and school budgets shrinking, energy use is a substantial cost that can be reduced through conservation efforts. Using a case study methodology, the authors compare two public high schools from the same school district, one that has achieved moderate energy savings and another that has reduced its electricity use by 50% over several years. Examining the individual and organizational components of both schools; efforts, the authors find that the greater success at one school is the result of integrated efforts at all levels within the organization, from district administrators to individual students. Success is based on structural changes, individual behavioral change, and, most important, the weaving of both into a cohesive organizational culture emphasizing conservation. This study demonstrates the potential of behavioral change and organizational culture to foster environmental education, conservation, and fiscal savings for other public schools. (Contains 1 note, 2 tables, and 4 figures.)