Hydroelectric power is the original form of solar power, and it has the ability to store energy for later use. I live near the Mc Nary dam that’s on the Columbia river on Oregon, and for about a 100ft. drop in elevation, they can generate close to a gigawatt of power, including spillover and operating the locks and fish ladders. Oh, and this dam was built in the 1950’s. Smaller dams, all tied to the grid and controlled remotely, could easily beat anything windmills can turn out.