"United States." . . "Renewable energy sources United States." . . "Research." . . "Energy development Research." . . "Energy conservation United States." . . "Research and development projects." . . "Renewable energy sources." . . . . "A decade of discovery"@en . . . "Accomplishments of the Department of Energy's seventeen national laboratories, including development of biofuels, solar power, fusion energy, the power grid, and nuclear deterrents."@en . . . "Discovery"@en . . . . . . . . "Accomplishments of the government-founded National Laboratories, including development of biofuels, solar power, fusion energy, the power grid, and nuclear deterrents."@en . . . . . . . . . . . . . . . . "United States. Department of Energy." . . "United States. Department of Energy" . "Energy conservation." . . . .