Right now renewables and storage are cheaper than most new fossil fuel types of generation. The cheapest new fossil fuel generation, gas, is bottlenecked by limited capacity to build new turbines currently.

So if you look at new resources being added to the grid, it's all solar, wind, storage, and a tiny bit of new fossil gas generation.

The biggest impediment to more renewables is no longer cost, it's politics and regulations. We have a president that has torpedoes one of the best new sources of wind, offshore wind, just as it's becoming super economical, and all the rest of the world is going to get the benefit of that cheap energy while the US falls behind. Floating offshore wind in the Pacific, based on the same type of tech as floating oil platforms, could provide a hugely beneficial amount of electricity at night and in winter, to balance out solar with less storage and less overbuilding.

Meanwhile on land, transmission line are a huge bottleneck towards more solar and wind, and the interconnection queue for the grid is backed out to hell in most places.

The technology and economics are there, but the humans and their bureaucracy is not ready to fully jump on board.