A report by Analysis Group suggests that low natural gas prices and other factors have influenced the market for coal power more than renewable energy and related subsidies, the American Wind Energy Association and the Advanced Energy Economy reported. Energy Secretary Rick Perry had launched a 60-day review of grid reliability on April 14, suggesting the move to more wind and solar power may have undermined the finances of coal and nuclear plants. "Recently, some have raised concerns that current electric market conditions may be undermining the financial viability of certain conventional power plant technologies (like existing coal and nuclear units) and thus jeopardizing electric system reliability. In addition, some point to federal and state policies supporting renewable energy as a primary cause of such impacts," the report contends. "The evidence does not support this view." The consultants contend that market forces and aging resources are more of a factor.