Without enough Energy Units you will not be able to build any structures. Every structure requires a certain amount of Energy Units to function properly. When expanding your Island, you will soon use up the Energy Units you have build so far.
The table below gives an overview of the costs to produce Energy Units. There are three different types of Energy Unit production facilities: Windmills, Generators and Solar power plants. They all vary in size and costs, so depending on your Energy Unit needs and the available space on your Island you might want to make a well-advised choise which Energy Unit production facility to build.
| Facility | Measurements | Available | Initial production | Costs per Energy Unit per tile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Windmill | 1x1 | Level 1 | 35 | $ 21.4 | |||||||||||
| Generator | 2x2 | 90 | $ 27.8 | ||||||||||||
| Solar power plant | 5x5 | 210 | $ 11.4 |