The Electric Fence is (as far as I know) only featured in Stalag Flucht, the second prison (not counting the tutorial) in the game. It always has a power source located somewhere in the prison and it is the Generator. If the power source isn't disabled by left-clicking the generator, when the player tries to cut or file the fence, they will be knocked out and sent to the infirmary after a few cut attempts, not to mention also losing all their contraband.

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