I'm not saying this is an answer, I just like the engineering and science. Its a good story of overcoming problems.
I support the government sponsoring this type of engineering.
"In the ugly-but-effective power tower at Newcastle, McNaughton's team reticulate 100 kilograms of CO2 through the receiver. It is heated to 720 degrees and runs a fridge‑sized turbine which has produced enough power to run a small town."
http://www.copyright link/lifestyle...a-future-of-sustainable-power-20160401-gnwlcu
"When you have 170 heliostats pointing at one 4.5‑metre hole, the problem isn't generating the heat," McNaughton says. "The challenge is not melting everything."
"McNaughton's team will have a prototype plant operating by the end of 2016, and he expects it to run for at least two years before the big banks and super funds consider it to be sufficiently low risk to be worth investing in. One risk they don't have to worry about is fossil fuel price volatility, a fact McNaughton says will see financiers backing the technology. "
