Power Efficiency and Resiliency Act or the POWER Act

Amends the Internal Revenue Code to: (1) allow a 30% energy tax credit for combined heat and power system property and increase the capacity limitations for such property, (2) extend until December 31, 2018, the placed-in-service deadline for such property, and (3) allow a 30% energy tax credit for waste heat to power property (property comprising a system generating electricity through the recovery of a qualified waste heat resource) placed in service before January 1, 2019.

Includes within the definition of "qualified waste heat resource": (1) exhaust heat or flared gas from any industrial process; (2) waste gas or industrial tail gas that would otherwise be flared, incinerated, or vented; and (3) a pressure drop in any gas for an industrial or commercial process. Excludes from such definition any heat resource from a process the primary purpose of which is the generation of electricity utilizing a fossil fuel or nuclear energy.