Development of high-temperature superconducting wire will transmit more electric current, making power plants more efficient, smaller and less costly to operate. Electric lightbulbs are invented and marketed. 1930's - Aerogels are invented, but are difficult to produce. Fluorescent lights and electric heat pumps are developed. New higher-voltage transmission lines carry power from generating plants to urban centers.
Nuclear power is available commercially.
1970's - The Mideast oil embargo causes the price of oil to quadruple, and illustrates that energy can be used as a political weapon. Research into alternative energy sources begin to receive more funding. Solar energy cells are first used on spacecraft. The Three Mile Island nuclear accident raises concerns about the safety of nuclear energy. Research enables more efficient lighting ballasts and window coatings that conserve heat.