opportunities to reduce energy expense and carbon footprints. (3) Electric utility The term electric utility means any company, person, cooperative, State, or Indian tribe agency that delivers or sells electric energy at retail, including nonregulated utilities, utilities that are subject to State or Indian tribe rate regulation, and Federal power marketing administrations. (4) Federal rebate processing system The term Federal Rebate Processing System means the Federal Rebate Processing System established under section 32103(b). (5) Home The term home means a residential dwelling unit in a building with no more than 4 dwelling units that— (A) is located in the United States