The Office of Energy Efficiency and Renewable Energy includes several research, development, and deployment programs that focus on energy efficiency and sustainable vehicles. For more information, see the websites for the programs:
Advanced Manufacturing Office 
The Advanced Manufacturing Office focused on energy efficiency at the industrial and manufacturing fields.
Buildings
The Building Technologies Program supports building energy efficiency for residential and commercial buildings.
Federal Energy Management
The Federal Energy Management Program (FEMP) provides services, tools, and expertise to federal agencies to help them achieve their legislated and executive-ordered energy, greenhouse gas, and water goals.
Vehicles
The Vehicle Technologies Program helps transition alternative fuels and vehicles into the marketplace.
Weatherization and Intergovernmental
The Weatherization and Intergovernmental Program provides grants, technical assistance, and information tools to states, local governments, community action agencies, utilities, Indian tribes, and overseas U.S. territories for their energy programs.