The first satellite, Sputnik 1, had been launched by the Soviet Union in 1957. The first American satellite followed in 1958, but Vanguard 1, the first to be powered by solar energy, represented a significant innovation.
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The main energy storage method in the EU is by far 'pumped storage hydropower', which works by pumping water into reservoirs when there is an electricity surplus in the grid - for example on a sunny or windy day - and releasing it when more energy is needed.