GRID-CONNECTED UNIDIRECTIONAL POWER SUPPLY

A power system connectable to an electric utility grid includes a local bus connected to at least one non-grid source of electrical energy; an electrical connection between the local bus and an electric utility grid; and a unidirectional AC-to-DC power supply electrically interposed between the electric utility grid and the local bus, the power supply having an AC side and a DC side, wherein the power supply is configured to allow energy flow only from the AC side to the DC side.