Once inside, you'll find a power box missing fuses. Collect the hidden around the room: one is behind a loose brick (use the crowbar), and another is in a toolbox.
Pick up the from the ground and use it to pry open the wooden crate. File: DID_Adventure_Escape_From_The_Abandoned_F...
Retrieve the inside the crate to unlock the main door. The Power Grid Puzzle : Once inside, you'll find a power box missing fuses