The Energy Crystal is a structure that spawns around each map in The Conquerors. It is used to build Power Plants and Nuclear plants, which in turn provide cash. Only one Power Plant or Nuclear Plant can be placed at an Energy Crystal for each player.
A Power Plant is a structure that can be built for $65 in The Conquerors. It is used to generate cash. For each Power Plant that a player controls, they will earn an extra $10 p/m. To build a Power Plant, a player must have a unit or building close enough to it and the Power plant site must be close enough to the Energy Crystal.
A Nuclear Plant is an upgraded version of the Power Plant that can be built for $140 in The Conquerors. The Nuclear Plant generates an extra $14 p/m for the builder. To build a Nuclear Silo, the player needs at least 2 Nuclear Plants. To build a Nuclear Plant, there are the same requirements for the Power Plant; a player must have a unit or building close enough to it and the Power plant site must be close enough to the Energy Crystal.