"The real issue is that this will require investment in research and that means not making a profit in the next 3 years, which is about the duration of how far a CXO looks."
Ahh... No.
1. There is not enough hydro resources in the US. The US has actually exploited a lot of them already. They US already gets 7% from hydro and has been using it for decades.
2. "And there is dessert enough available to put a LOT of sun collectors." And no effective way to store it for use at night and the evenings. Solar only produces power for around 8 hours a day. Less in the winter. Storage is now and has been a problem forever. Lots of money is being out into battery tech but nothing is shipping yet. Solar production also does not match peak demand. It comes close in summer but still drops to near zero while peak hours are still in effect. Also most desserts in the US are in the south. They have shorter days than areas in the north of the US in summer and much higher temperatures which means lots of AC.
Even Germany which people like to show as Solar working is really not a working system. They are going to massive coal plants for base load.
http://www.businessinsider.com...
Costa Rica is a small mountainous nation that has huge amounts of rain forests. Frankly it was dumb for them to ever use fossil fuels for electricity except as a back up. In many ways they are like Iceland in that regard. The US has a lot of hydro resources and is using them but it is not enough to power the entire US.