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Ground-level power supply, also known as surface current collection or, in French, alimentation par le sol ("feeding via the ground"), is a concept and group of technologies that enable electric vehicles to collect electric power at ground level instead of the more common overhead lines.
Ground-level power supply systems date to the beginning of electric tramways. Often they were implemented where the public expressed an aesthetic desire to avoid overhead lines. Some of the earliest systems used conduit current collection. Systems in the 21st century, such as Alstom APS, Ansaldo Tramwave, CAF ACR, and Elways, were developed to modern standards of safety and reliability, and added the ability to supply power to electric buses, trucks, and cars.
Some ground-level power supply systems use efficient, energy-dense capacitors and batteries to power portions of an electric transit system—for example, enabling buses and trains to charge their batteries during station stops.