For those of you who are as frustrated as I am running around in a dark as fuck police station for an hour. Here's what you need to do to turn on the power.
Warning: If you turn on the power before talking to the prisoner, you'll lose out on 2 corruption points, because his cell door will open when the power is restored & he'll be gone. This is potentially a problem for completing future side quests that have a high Corruption requirement
To find the Prisoner, start at Police reception area (the first room when you enter the police station). Go right, and you'll find a room with a row of cells. The Prisoner is in the last cell
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You first need to find a clue for where the staff key is. From the Police station reception room, you need to go north 3 times until you reach the Garage. Kill the zombies. Inspect the Red Switch to read a note that tells you the Staff Key is located in a flowerpot.
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You need a Staff Key found under a flowerpot. Go back to the previous room you came from. The flowerpot is in the top left corner, as you can "clearly see" in my screencap. And no, you can't loot it prior to reading the clue, because why?
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Go back to the red switch in the garage to unlock it. Apparently, this red switch is the Junction Box. Who knew? But you can't switch it on because you lack a fuse. Don't know how she knows that when she can't see
Luckily the Fuse is found to the right of the red switch (Junction Box). And again, for some reason you can't loot it early for reasons that I can't fathom. Inspect the Junction Box again to turn on the power
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Locked Locker code: 666, located to the south east of the Gym
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The Screwdriver for the Armory is here in the Gym. There's no visible marker
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The Sherrif's Safe code (as inspected on the Sherrif's Key): 0912