Concrete Factory
Produces concrete, which is essential for building construction and also plays an important role in base defense.
Steel Mill
Steel is used for buildings, vehicles, planes, boats, armored trains, and helicopters, which the steel mill provides.
Aluminum Factory
Aluminum is particularly important for air units, but it is also used for vehicles, buildings, armored trains, and boats.
Oil Refinery
Processes crude oil into fuel for all mobile units. While vehicles, boats, trains, helicopters, planes, and airships move, they consume fuel.
Production Rate

The more bases you have on the map, the lower the production efficiency becomes. Formula: Productivity = (Number_of_Bases ^ 0.5) / Number_of_Bases Examples: - 1 Base: → 100% Efficiency - 2 Bases: → 70.7% Efficiency - 4 Bases: → 50% Efficiency - 10 Bases: → 31.6% Efficiency - 25 Bases: → 20% Efficiency - 100 Bases: → 10% Efficiency Example with bases that all have the same steel mill upgrade level: You have 1 base on the map, it produces 1,000 steel/min You have 4 bases on the map, they produce 2,000 steel/min (4,000 * 50% = 2,000)

Storage

↪ Each concrete factory increases the concrete storage limit on the map. ↪ Each steel mill increases the steel storage limit on the map. ↪ Each aluminum factory increases the aluminum storage limit on the map. ↪ Each coal liquefaction plant increases the fuel storage limit on the map. ↪ The storage maximum applies only to the respective map. Example: Factories on Map11 do not increase storage on Map12. ↪ Each additional factory increases the storage maximum slightly less than the previous one. ↪ On the home map, you have an additional storage maximum of 1,000,000 concrete, 500,000 steel, 250,000 aluminum, and 50,000 fuel. ↪ If you have a second base on the home map, the storage maximum on the home map is expanded by 750,000 concrete, 1,000,000 steel, and 500,000 aluminum. ↪ If the storage maximum is reached, all factories stop producing.