Economist: THE coal-fired power plant that was cancelled in Michigan on May 1st is the 97th to be rejected since 2001, and the ninth this year. The number of planned coal plants across America has plummeted from 150 to 60 in the past five years. Last year 5,465 megawatts (MW) of new electricity were announced, but more than twice that capacity–12,572mw, according to Edison Electric Institute, which represents the electricity industry–was subtracted because of cancellations or delays. The nine coal …