Seems a "comeback" for coal in the US is unlikely...
In fact, many coal-fired power plants announced their closure in 2017. The timeline is below:
February 13, 2017: Navajo Generating Station in Arizona announced the closure of all three units (3×803 MW) in 2019 when its lease expires.
March 16, 2017: The 282-MW Unit, of the Elmer Smith power plant in Owensboro in Western Kentucky, is closed.
March 16, 2017: San Juan Generating Station in Waterflow, New Mexico prepares to close two units of 924 MW by 2022.
March 17, 2017: St. Johns River Power Park, a 1,252 MW coal-fired electric generating plant, is announced to close in early 2018.
March 20, 2017: All four units of the 2,440 MW J.M. Stuart Generating Station near Aberdeen, Ohio will retire.
March 20, 2017: The 666 MW Killen Generating Station near Manchester, Ohio announces its retirement.
May 2, 2017: The two-unit, 115-MW Edgecombe Genco coal-fired power plant, located in Rocky Mount, North Carolina, will close in 2020 as announced by its owner.
May 4, 2017: Idaho Power Company announced the closure of its two units of 521 MW, at Nevada’s North Valmy Generating Station. Unit 1 (254 MW) will close in 2019 and Unit 2 (267 MW) in 2025.
May 16, 2017: Detroit, Michigan based DTE Energy Co (NYSE:DTE) announced the closure its eight generating units at four plants with a combined capacity of 3,355 MW by 2050. These include:
All four units at Monroe (4x850MW),
Two units at Belle River (2×697.5MW),
One unit at Marysville (1x150MW), and
One unit at Harbor Beach (1x121MW).
May 28, 2017: James River Power Station shut down its five units. Unit 1 (22 MW), Unit 2 (22 MW), and Unit 3 (44 MW) permanently closed in December 2017, while Unit 4 (60 MW) and Unit 5 (105 MW) will shut down within two years.
June 2, 2017: Kansas City Power & Light Company announced the closure of its six generating units at the company’s Montrose, Lake Road, and Sibley Stations, with a combined capacity of 900 MW
July 5, 2017: Idaho Power decides to shut down Units 1 and 2 at the Jim Bridger in 2032 and 2028, respectively.
August 23, 2017: The Lansing Board of Water and Light will close its 155 MW coal-fired Erickson Generating Station by December 2025.
October 8, 2017: Luminant, a subsidiary of Vistra Energy Corp (NYSE:VST), announced closure of its 1,800 MW Monticello power plant on January 4. 2018.
October 13, 2017: Luminant announced the closure of its two-unit Sandow Power Plant in Milam County, Central Texas. Unit four with, a capacity of 591 MW, and Unit 5, with a capacity 581 MW, will close in early 2018.
October 13, 2017: Luminant announced the closure of its two-unit Big Brown Power Plant in Freestone County, Texas. Units 1 and 2, both with a capacity 595 MW, will close in early 2018.
November 14, 2017: Kentucky Utilities announced about the closure of Unit 1 (114 MW) and Unit 2 (180 MW) located at the E.W. Brown coal plant near Herrington Lake in Harrodsburg, Kentucky.
November 15, 2017: Rocky Mountain Power announces its decision to close the 116 MW Hardin Generating Station in early 2018.
November 28, 2017: Milwaukee-based WEC Energy Group Inc (NYSE:WEC) announced to close the Pleasant Prairie coal-fired power plant (2 units, 595 MW each) permanently in the second quarter of 2018.
November 28, 2017: Wisconsin Public Service decided to close the last two units–Unit 7 (81.6 MW) and Unit 8 (149.6 MW)–at its J.P. Pulliam plant in Green Bay, WI between late 2018 and early 2019.
December 1, 2017: Willmar Municipal Utilities announced the closure of its 22 MW coal-fired plant.
December 7, 2017: The owners of Colver Power Plant announced the closure of its only unit (Unit 1, 118 MW) in September of 2020.
The dramatic reduction in the prices of renewable energy resources and natural gas has led to the decline in coal consumption, resulting in the U.S. coal industry decline. This will continue in the future, too, as coal is not in demand anymore.
And this was under the first full year of the Trump adminstration, an administration that couldn't have been more supportive (publicly) of coal-fired generation. And yet all these plants were announced for closure. That is a staggering amount of baseload power coming off the grid in years to come.