lets look at renewable energy then, page-23

zzzedzz,

I didn't say it was widely used at present, it hasn't been needed with all the cheap fossil fuels to burn.
It is however, simple technology that a child would understand and certainly viable.
The Germans used liquid salt technology in WW2.

The CSIRO have developed a brilliant home sized solar thermal system using salt to power a stirling heat engine.

http://www.ecosmagazine.com/?paper=EC124p28

Other links to salt as a heat battery.


http://www.reuk.co.uk/Molten-Salt-for-Heat-Storage.htm

http://www.alternative-energy-news.info/molten-salt-solar-plant/

http://www.hotonearth.co.uk/news/39060/molten_salt_as_solar_heat_battery/