There are various energy constructions in the game. They generate different amount of energy points and you can choose whether to buy a number of cheap units or one expansive. As all the buildings in your country need energy points, you can remove some of them to get energy. To learn your energy status check the special yellow bar in the upper right corner of the game window. Note, that these types of constructions give you energy points only once when you buy them. For example, when you purchase Windmill your current amount of energy points increases by 26 points.
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