The US doesn't have a free market in either health care or electricity generation. An actual free market in solar power would probably result in more or less what we are seeing with the actual highly regulated market in electricity, namely extremely cheap prices for additonal solar energy in the middle of the day when the sun is shining, higher prices for additonal solar energy in the evening when demand is high and the sun has gone down, and some fixed cost to pay for physical electric grid infrastructure that needs maintenance regardless of whether it is being used at any particular moment.

Oil and gas don't buy polticians more than any other industry does, but voters do get particularly angry at politicians when the price they pay for energy suddenly spikes.