Then why is it more expensive when I opt to use renewable (including solar) energy with the electric company?

Oh wait, that’s because none of them actually want people to use it because they make less from it and/or are already so invested in fossil fuels that they don’t want to lose money on their investments so they jack up the costs intentionally to dissuade people from using it.

That’s just my opinion on the matter, I don’t have the data to back it up outside of the electric company here giving you the option to enroll in renewable energy at a higher cost.