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Used other than figuratively or idiomatically: seepower, supply.
The utility will invest in power plants and transmission lines to ensure a stable power supply.
1961 December, “Planning the London Midland main-line electrification”, in Trains Illustrated, page 722:
The track-sectioning cabins house not only switchgear for the traction current, but also transformers to provide power supplies to the signalling equipment.