From the publisher's website:
As the leader of a warring faction, you control the destiny of your people. On the Earth, in the great underwater domed cities beneath the oceans, in orbit, and even on the Moon, you must marshal your forces, send forth your troops, and hire the right commanders to crush your enemies. Build alliances if you dare, but be wary of whom you trust. Energy is the currency of the 23rd century; spend wisely and you just might conquer the world -- and beyond.