The Reactor is a base game unit that increases your energy generation.

• Requires 28 Energy to construct.
• Fits in a box of 10 by 10 terrain pixels.
• Increases its production linearly from 0 to 0.9 over 4 minutes.
• Must be attached to a 2×2 box of solid terrain, the Reactor will self destruct if the terrain it is attached to is destroyed.

The reactor is your primary method of increasing your energy generation in a mission; without them you are stuck with the Apex Ships maximum 3.00 energy generation. You usually want to build these early to ensure you have a strong economy for the mid and late game. You want to keep your Reactors in a very defensible location, Reactors can't be moved and losing them can cripple your economy.

By default your Apex ship spawns with 200 energy, enough to build 7 reactors; it is advised to not build more than this at the start unless you have access to Kirkium. This is the highest economy start and if you do not need ships immediately this is rarely a bad choice for what to start building.

Each Reactor takes about 2 minutes to pay for itself and do not come equipped with any weapons. If a map is being put in a losing or disadvantageous position in that time, it might be worth it to build ships instead of getting all of your reactors up immediately.