[nine_k]

Let's calculate a bit.

> Most flow battery companies have $100 / kwh capital cost as a target

With typical power plants generating e.g. 500 MW 24 hours long, the storage is going to be 100000 $/MWh * 500 MW = 50M/hour. If we assume that a solar plant generates power for 12 hours, and the batteries feed the consumers for 12 more hours, it's going to be 600M for storage alone. The solar power plant with a peak power well above 500MW (to feed the day load + charge the batteries for the night) will cost you extra.

I still think that a Thorium molten salt reactor is a strong contender in a price landscape like this. (It also has a nice ability to burn our current stockpiles of radioactive waste from Uranium reactors.)