APR Energy filed a notice with state officials saying it will permanently lay off 50 of its 150 workers at its Jacksonville headquarters at 3600 Port Jacksonville Parkway.
The letter sent July 29 under the Worker Adjustment and Retraining Notification Act said the layoffs will begin on or about Sept. 28.
APR provides power plants on a fast-track basis around the world.
The company was publicly traded before a buyout by a group of private equity firms in 2016.
APR was sold again in February 2020 for $750 million to Atlas Corp., a Hong Kong-based holding company.
Publicly traded Atlas said in its second-quarter earnings report this week that APR produced revenue of $75.9 million and net income of $6.4 million from Feb. 29, after it was acquired by Atlas, through the end of the second quarter.