Minnesota Public Radio: Xcel Energy is one of five big electric companies targeted last fall by New York Attorney General Andrew Cuomo. Using a New York state law, he subpoenaed them to determine whether their reports to the Securities and Exchange Commission — the agency that regulates Wall Street — were adequate. The government will soon set limits on greenhouse gas emissions, and companies should start taking those limits into account, Cuomo and other investor watchdogs say. Coal-fired power plants …