The planes are designed for short-haul flights of 300 miles or less

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An electric aircraft is an aircraft powered by electric motors. Electricity may be supplied by a variety of methods including; batteries, ground power cables, solar cells, ultracapacitors, fuel cells and even power beaming.
Electrically powered model aircraft have been flown since the 1970s, with one unconfirmed report as early as 1957. They have since developed into small battery-powered unmanned aerial vehicles or drones, which in the twenty-first century have become widely used for many purposes.
Although manned flights in a tethered helicopter go back to 1917 and in airships to the previous century, the first manned free flight by an electrically powered aeroplane was not made until 1973 and most manned electric aircraft today are still only experimental demonstrators. Between 2015 and 2016, Solar Impulse 2 completed a circumnavigation of the Earth…………………………………
Source : wikipedia