It&#x27;s not made clear why they don&#x27;t just add solar to the general grid and power the plants from whatever the grid is providing. Presumably that would be solar during the day, maybe some CSP after sunset, maybe some wind at night, but if they really need to burn some oil during the night then it&#x27;s not the end of the world. Better than giving up because they can&#x27;t figure out how to run the machinary from one particular power source.