In Dying Light 2, the hero needs to get to the safe zone. There is a safe zone in the house next to the Tower Antenna. The hero needs to get to the Tower Antenna first, and then search for a place to sleep, and that is the safe zone. Then come out and defeat enemies.
After defeating the enemies, the hero will be able to approach the garage. On the xbox 1, press A many times to open the garage and get to the generator. Then turn on the power.