The New Orleans-based company, which owns utilities in Arkansas, Louisiana, Mississippi and Texas, and sells power on the wholesale market, has been pressured by low U.S. natural-gas prices that have pushed wholesale power prices lower. In its news release Tuesday, Entergy said the exact timing, which depends on several factors, including discussions with regulators, would be decided during the first half of next year. Entergy said current and forecast power prices have fallen about $10 per megawatt hour, representing an annual loss of more than $40 million in revenue for the Pilgrim plant, located in Plymouth, Mass. The plant had been expected to post net operating losses ranging from roughly $10 million to $30 million for this year, next year and 2017—before accounting for additional costs related to the decision to close the plant and any potential write-downs. Once the plant is shut down, Pilgrim will transition to decommissioning. […]