Colonies use their production income to build Structures for the Colony Center and its Province Sectors. Structures can provide economic and military bonuses for the colony. Colonies can also produce Units, an essential military presence for the Player's empire.
Everything that can be build has a Production cost. The colony's production income is added to the current production project at the end of each turn. When the total production cost is fulfilled, the project is completed, and any remaining production income will overflow to the next project in the Production Queue. Each colony has a single production queue, and can work on one thing at a time.