But a new report prepared by consulting firm Analysis Group concludes that the evidence does not support these claims. The addition of new natural gas-fired units and renewable energy capacity are increasing the nation’s electric reliability, not jeopardizing it, the report says. The report, titled “Electricity Markets, Reliability and the Evolving U.S. Power System,” was released only days before Department of Energy staff members are scheduled to deliver a report on the impact of renewables on the nation’s power grid. In April, Energy Secretary Rick Perry directed his staff to put together the report, which environmentalists and renewable energy advocates have worried will be tilted in favor of the coal industry. Perry ordered the grid study to be completed in 60 days.The Analysis Group report concludes many advanced energy technologies such as efficient natural gas-fired generation and renewables provide reliability benefits by increasing the diversity of the electric system. As wind and solar energy become more prominent in certain regions, the trend in reliability performance in these areas is increasing rather than decreasing, the report says.