Both "worst car accident" contenders here have bigger death tolls than Chernobyl and Fukushima combined: https://history.stackexchange.com/questions/9856/which-

Both "worst car accident" contenders here have bigger death tolls than Chernobyl and Fukushima combined: https://history.stackexchange.com/questions/9856/which-single-car-accident-in-history-caused-the-most-deaths https://history.stackexchange.com/questions/9856/which-singl... This doesn't really matter though since it's a meaningless safety measure to compare "worst accident per machine" between a single car and a power plant serving a million people. By this measure biking is much safer than train riding. Here's some more useful stats and trivia about death tolls and power generation: http://nextbigfuture.com/2011/03/deaths-per-twh-by-energy-source.html http://nextbigfuture.com/2011/03/deaths-per-twh-by-energy-so... http://io9.gizmodo.com/5783526/what-is-the-worst-kind-of-power-plant-disaster-hint-its-not-nuclear http://io9.gizmodo.com/5783526/what-is-the-worst-kind-of-pow... By "death toll per single machine", hydro would be the worst energy source, beating nuclear by 3-4 orders of magnitude.