TA-DA! The park will come to life and you can head to the North East Area of the map to use the workstation in the Red Rocket Settlement. Once completed, you’ll be pointed towards the Nuka-World Power Plant on the west side of the map, climbing to the top of the Power Plant and you’ll find a security cage and inside all you’ll need to do is hit the big red button. By starting the mission “Open Season” which is given to you by Mackinzie Bridgeman in Nuka Town USA you will be quested to kill the three leaders of the gangs. Going down the good route means turning on the three gangs in Nuka World and killing all the raiders. Knowing how to turn on the power in Nuka-World can be done in two different ways and you don’t need the power plant key. This stops you from being able to use the workshop in the Red Rocket Settlement and build your own slice of entertainment in the park.
In Nuka-World as you walk around you’ll will start to notice that most of the power in the park and various zones is turned off. Fallout 4’s Nuka-World DLC is the last of the six different DLC packages to come out for the game.