Wiktionary
power off
vb. (context transitive English) to turn off, to cut the power to
Usage examples of "power off".
When overloaded, they would simply shunt the excess power off as visible light.
They had kicked all Earthly power off Mars, it had been a long campaign, capped by a burst of furious action following the great flood on Terra.
When Anthony had turned the power off and on, the valve had reset itself, although it could fail again at any time and would have to be replaced, the technician explained.