They need to make sure the equipment is fully functional and clean, as well as making sure it is connected to the automobile's main power source. (jobdescriptionandresumeexamples.com)
One of the two main power supply cables for the laboratory was damaged by the fire. (newscientist.com)
It looks like this character uses ice as main power, and it will be interesting to know more about him / her. (segmentnext.com)