danlb_2000
Premium Member
Generating electricity costs money. Doesn't matter who owns the generator.
But the cost calculation is different when you own the power plant. When you are buying from someone else you pay for what you use, so if you turn on a light you are now paying slightly more from the supplier. But if your power is coming from your own power plant, turning on that same light doesn't suddenly cause the power plant to use a little bit more fuel, power generation doesn't adjust dynamically like that.