In terms of energy accidents , hydroelectric plants were responsible for the most fatalities , but nuclear power plant accidents rank first in terms of their economic cost , accounting for 41 percent of all property damage . Oil and hydroelectric follow at around 25 percent each , followed by natural gas at 9 percent and coal at 2 percent . Excluding Chernobyl and the Shimantan Dam , the three other most expensive accidents involved the Exxon Valdez oil spill ( Alaska ) , the Prestige oil spill ( Spain ) , and the Three Mile Island nuclear accident ( Pennsylvania )
Three Mile Island nuclear accident
Three Mile Island accident
Nuclear and radiation accidents and incidents