When residents in De Luz were forced to evacuate about 100 homes during the Rock Fire in July, an emergency generator installed by the Fallbrook Public Utility District proved its value by providing water to help firefighters extinguish the blaze. The generator was installed about a year ago at the Donnil Pump Station at a cost of about $140,000. Since then, several fires have sparked in the hilly backcountry community north of Fallbrook.