The introduction starts off with a power failure, followed by your boss yelling at you to fix the power.
When you stand up, the radio is located behind you. Answer it, and once done, head to the vehicle outside.
To enter the building, you will need to fix at least one transformer before continuing to the left to enter. Head into the side entrance on the left and down the corridor.
When you reach the double doors, pass through them to enter the reactor. Head through the east door and repair the box to restore power.
In a short cutscene, you will see one of your workers having trouble with some monsters. Return to the corridor and head right. Collect the pistol after you proceed down the path. Collect any other supplies and enter storage room to the side to find your co-worker.
As soon as you see the body, you will receive a distress call from the Water Treatment Facility. Continue through the warehouse to the exit.