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FILE - President Jimmy Carter speaks against a backdrop of solar panels at the White House, June 21, 1979, in Washington. (AP Photo/Harvey Georges, File)

FILE - President Jimmy Carter speaks against a backdrop of solar panels at the White House, June 21, 1979, in Washington. (AP Photo/Harvey Georges, File)

FILE - President Jimmy Carter talks to power plant workers against a backdrop of tall stacks at the Louisville Gas and Electric Company plant in Louisville, Ky., July 31, 1979. (AP Photo, File)

FILE - President Jimmy Carter talks to power plant workers against a backdrop of tall stacks at the Louisville Gas and Electric Company plant in Louisville, Ky., July 31, 1979. (AP Photo, File)

FILE - Lillian Carter, mother of Jimmy Carter, displays her "Jimmy Won!" T-shirt at a train station after Carter was declared the winner in the presidential election, Nov. 3, 1976, in Plains, Ga. (AP Photo, File)

FILE - Lillian Carter, mother of Jimmy Carter, displays her "Jimmy Won!" T-shirt at a train station after Carter was declared the winner in the presidential election, Nov. 3, 1976, in Plains, Ga. (AP Photo, File)

FILE - President Jimmy Carter speaks to executives of gas-using businesses at the White House in Washington, Aug. 31, 1978, before the passage of a natural gas compromise bill. (AP Photo/Jeff Taylor, File)

FILE - President Jimmy Carter speaks to executives of gas-using businesses at the White House in Washington, Aug. 31, 1978, before the passage of a natural gas compromise bill. (AP Photo/Jeff Taylor, File)

FILE - Former President Jimmy Carter, center, sits with his grandson Jason Carter, left, and George Mori, executive vice president at SolAmerica Energy during a ribbon cutting ceremony for a solar panel project on Jimmy Carter's farmland in his hometown of Plains, Ga., Feb. 8, 2017. (AP Photo/David Goldman, File)

FILE - Former President Jimmy Carter, center, sits with his grandson Jason Carter, left, and George Mori, executive vice president at SolAmerica Energy during a ribbon cutting ceremony for a solar panel project on Jimmy Carter's farmland in his hometown of Plains, Ga., Feb. 8, 2017. (AP Photo/David Goldman, File)