It's cheaper and they're all subsidized. Solar is subsidized, oil and gas is subsidized, nuclear is subsidized. Fracking recieved significant subsidies to develop the market initially. Right now, solar/wind is cheaper than fossil fuels by a lot, which is why it's the largest percentage of newly added energy capacity worldwide. Cheaper, faster, and after installation, the power plant doesn't need to keep getting fed with a consumable (incredibly low variable costs are causing issues where markets are getting messed up and going into 0/negative prices since power plants are competing to dump energy it doesn't cost them anything to generate)