Clark Public Utilities in Vancouver, Washington, is buying renewable energy for its 155,000 customers through the Bonneville Environmental Foundation (BEF). The agreement calls for BEF to provide the utility with energy from eastern Washington wind and solar projects for three years. Clark says it will sell the power to customers through the utility's Green Lights program for a premium that will initially cost customers more, but the price may go down as participation rates rise. BEF is a non-profit organisation founded in 1998 to buy and sell green power. It develops renewable energy facilities and invests in watershed projects with the revenue it makes from its business activities.