FirstEnergy and another Ohio company have been fined more than $200,000 by federal officials for an August gas leak that killed two workers and injured four others at the utility’s Bruce Mansfield plant in Shippingport, Pa.

Akron-based FirstEnergy was fined $77,605 by the Occupational Health and Safety Administration, the Pittsburgh Post-Gazette reported. Cincinnati contractor EnerFab was fined $206,945. The facility along the Ohio River is FirstEnergy’s largest coal-fired power plant.

An EnerFab crew was performing maintenance at the time of the accident. OSHA found that FirstEnergy failed to properly communicate to Enerfab the dangers that the workers faced in the vault. It found that Enerfab failed to provide the proper respiratory protection for the workers.

The companies have until March 20 to appeal In a statement, FirstEnergy said it is reviewing the citations.