capstone is a member of the u.s. environmental protection agency's combined heat and power partnership, which is committed to improving the efficiency of the nation's energy infrastructure and reducing emissions of pollutants and greenhouse gases. a dqs-certified iso 9001:2015 and iso 14001:2015 certified company, capstone is headquartered in the los angeles area with sales and/or service centers in the united states, latin america, europe, middle east and asia.