Given our current battery technologies, drones have no choice but to pack light. This means most drones have an operating time of around 1 hour or so, and that's only if they're not struggling to keep afloat with a heavy load. That drastically shortens the travel time and distance of drones unless they find a way to charge en route.
Scientists from the University of Southern Denmark decided to design around a power source that is always there but isn't solar-powered, which would be too slow and too little for the drone's use. Instead, the drones clamp onto power lines, the very same thick cables that deliver power from one pole to another.
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