The Acter Nuclear Power Plant is a nuclear power plant in the Acter Industrial Park, Alderney City in the State of Alderney featured in Grand Theft Auto IV.
It is identical to the Hatch Nuclear Power Plant in Georgia, USA and has two boiling water reactors in one reactor complex. To cool the two reactors there are two cooling towers that are higher than 100m and that can be seen from Plumbers Skyway and even from parts of Algonquin. The reactor is located near the sea next to another power plant. In the area around the nuclear power plant there is also a large oil refinery and another power plant with a cooling tower.
To protect the plant there are a few security guards and policemen in the area. This is important because of the high crime rate in some districts nearby. Also the Acter NPP has a protective fence, but you can reach the plant by car too, it is easy to get to it. There are also stairs leading to the roof of the reactor. To protect the area against flood, there a protective wall was built. It is not known wether the plant is protected against meltdown or not.
The plant likely generates it's own power as well as feeding through the power lines into the national power grid. A special feature is that there is a person on the top of one cooling tower who seems to be a worker. On internet forums he is also known as "Gilbert".
If the player attempts to go into one of the cooling towers (by driving a helicopter in one or jumping into one via helicopter), the game will freeze for an unknown reason (Confirmed on the Xbox 360, uncomformined on PC).