A federal judge on [January 19] blocked Vermont from forcing the Vermont Yankee nuclear reactor to shut down when its license expires in March, saying that the state is trying to regulate nuclear safety, which only the federal government can do. The judge [said] in his ruling that ... state lawmakers and witnesses made clear that their effort to close the plant was grounded in radiological safety concerns" - the province of the federal Nuclear Regulatory Commission. The commission has already granted Vermont Yankee a 20-year license extension. The ruling is almost certain to be appealed by the state and an array of private groups that want the plant shut down because of leaks of radioactive tritium and other issues. Since Entergy bought Vermont Yankee 10 years ago, public opinion has turned sharply against the plant. After several plants around the country suffered leaks of radioactive water into the soil, state officials asked Vermont Yankee executives in 2009 whether their plant might be susceptible to that problem. The executives said that Vermont Yankee had no underground pipes carrying radioactive material. But it did - and the pipes leaked. The State Senate voted 26 to 4 in 2010 not to authorize the needed certificate.