Environmental groups are pleased with an Iowa Utilities Board ruling that requires MidAmerican Energy to make planning studies public for its Iowa Wind PRIME project. The massive green energy project is expected to add more than 2,000 megawatts of wind energy and 50 megawatts of solar energy to the power grid. But some groups say the public should be able to see the background studies, including what MidAmerican might do with its coal plants. ...