Purchasing Low-Emission Vehicles for Use in Government (PLUG) Act - Amends the Energy Policy Act of 1992 to instruct the Secretary of Energy to ensure that the federal government acquires not fewer than 50,000 plug-in hybrid electric vehicles manufactured in the United States by U.S. entities.
Defines a plug-in hybrid electric vehicle as a light duty vehicle propelled by an internal combustion engine or heat engine using: (1) a combustible fuel; (2) an on-board, rechargeable storage device; and (3) a device that collects electricity from an off-board source.