The Electric Fence is the same as a Fence, but is blue and when you are trying to cut it, it will electrocute you. (You will take 20 damage, and be sent to infirmary if knocked out.) They also extend downward a floor, posing an obstacle to digging escapes.
You can cut it safely if you disable the Generator. It was used in Stalag Flucht, San Pancho, Jungle Compound,HMP-Irongate and in some prisons of The Escapists 2.
In The Escapists 2, electric fences bear electric sparks and shock you if you get too near.