http://www.energystar.gov/index.cfm?fuseaction=pt_awards.showAwardDetails&esa_id=http://www.energystar.gov/index.cfm?fuseaction=pt_awards.showAwardDetails&esa_id=5606 2014 Corporate Social Responsibility Report 20 Renewable Energy Certificates The purchase of Renewable Energy Certificates (RECs) in the United States helps support the development of renewable energy sources.