In a press release, the company blamed "Sustained low wholesale power prices, an oversupplied renewable generation market, and low natural gas prices, along with other factors."
But these closures came at a surprising time: the Trump administration has been pushing some of the most aggressive policies aimed at helping out coal plants that we've seen yet.
The US Environmental Protection Agency (EPA) moved to roll back the Clean Power Plan just last week, and, in late September, the Department of Energy proposed a rule that would increase compensation for facilities that can store 90 days of fuel onsite (i.e., coal and nuclear energy).
Industry watchers expected the proposed lifelines would forestall exits from coal generation.
The Electric Reliability Council of Texas (ERCOT) announced in September that it expected to have a record-breaking winter, hitting 61,000MW of power demand.
The council added that approximately 3,000MW of new generation capacity had been added between May and September 2017, including "two gas-fired combined-cycle units totaling 2,200MW."