'Traveling Wave Reactor' I suspect it's very hard to make this work in practice. More significant in my view is Westinghouse's new design for a small modular reactor with "built-in" safety features. http://www.westinghousenuclear.com/smr/index.htm And on the solar front, German solar plants produced 20 gigawatts last week - on one of the weekend days this was 50% of the power consumed. http://www.guardian.co.uk/environment/2012/may/28/solar-power-world-record-germany?newsfeed=true Peter