How The World's Largest Solar Power Tower Field Powers 140,000 Homes

This is a very cool(hot?) project. I am interested to see the long term economics of it and how reliable the whole system will be.

I have heard of similar systems that use salt as the heated fluid in the towers. This allows for the towers to 'trap' heat and continue creating power when the sun is down. Maybe NRG (and the other companies) next build.