Opower is an energy efficiency company that provides utilities with a customer engagement platform to help households save energy. It was founded in 2007 and has grown to over 200 employees. Opower works with over 50 utilities to deliver personalized energy reports, online tools, and alerts to over 10 million households. This has helped households save an average of 3-5% on their energy bills, totaling over $450 million in savings. A California utility saw continued higher savings each year working with Opower by integrating it with their systems to easily transfer usage data. Key to Opower's success is that its reports are opt-out rather than opt-in, and it has good relationships with utilities.