As debate continues in San Diego County and around the state over how aggressively to conserve water amid a historic drought, a new study finds that cuts in urban water use have saved significant amounts of electricity and reduced greenhouse gas emissions. The analysis, published by UC Davis, capitalized on the unique circumstances created by California’s drought. It culled statistics that electric utilities and water districts statewide were required to submit because of Gov. Jerry Brown’s unprecedented order for residents and businesses to lower water consumption by an average of 25 percent.