That particular version takes the sunlight heat directly to high temperature water/steam, so the cost for overnight power storage would be thermal storage tanks for well insulated high pressure, high temperature water.
Ambient temperature storage of formic acid would be far cheaper and longer lasting for later use as fuel cell power at night to the grid, and could be shipped to vehicle markets.
High pressure storage tanks and insulation get more costly on an exponential curve as the tank diameter increases (hoop stress), so at some point the MVTG-ERC-MRFC energy storage would be more cost effective.
There is another design that uses molten salt storage (instead of water) at ambient pressure at 3000 F to store the heat that has future potential for overnight use.
Wind power has non of those options, they need an MVTG-ERC-MRFC solution badly. I like the thermal solar plants as a source for making vehicle fuel out of waste CO2 using the MVTG-ERC process.
