Under a deal up for approval next month, two power plants in Anne Arundel County would continue to burn coal at least three years longer than planned — potentially costing Marylanders $250 million or more every year. PJM Interconnection, the region’s power grid operator, has asked the Federal Energy Regulatory Commission to issue an order approving its deal with power plant operator Talen Energy by June 18, according to a tariff filing last month.
