Coal-fired power plants and mines in Texas have been closing for the past few years.
Early last year, electricity generator Luminant cut about 600 jobs as it closed three coal-fired power plants and a mine in the state. That included about 200 people who had been employed at a plant near Mount Pleasant in East Texas.
The layoffs occurred as Luminant shuttered its Monticello, Big Brown and Sandow power plants.
The company said it was closing the power plants because of competition from inexpensive natural gas, low wholesale power prices and an increase in renewable generation.
Such moves have been ongoing for the past few years. At the end of 2016, Luminant laid off 132 workers as it shuttered its Oak Hill lignite mine near Tatum.
It still operates its Martin Lake unit southwest of Tatum in Rusk County.
AEP Southwestern Electric Power Co. also operates coal-fired plants in the region: the Henry W. Pirkey Power Plant near Hallsville and the J. Robert Welsh Power Plant northwest of Pittsburg.