You can tell solar+storage is cheaper than anything else except conditionally wind at least in the US because people have stopped building new generation capacity for anything else.
[0] https://www.woodmac.com/press-releases/chinas-solar-producti...
[1] https://www.eia.gov/analysis/requests/subsidy/
Solar + Storage is cheaper than a gas peaker plant, but it is not cost competitive with a base load gas plant.
You can tell solar+storage is cheaper than anything else except conditionally wind at least in the US because people have stopped building new generation capacity for anything else.