Regulators in Washington state have fined TransAlta more than $331,000 for alleged air pollution violations at its coal-fired power plant in Centralia.
The Southwest Clean Air Agency says the facility exceeded federal standards for mercury emissions and did not fully operate equipment to control emissions of nitrogen oxides.
The Columbian newspaper says the plant reported the higher mercury emissions, while an engineer at the Clean Air Agency discovered that the plant's pollution control equipment was under performing.
TransAlta's Stacey Hatcher said Thursday that the company disagrees with the penalties assessed and will appeal the decision.
Hatcher noted that the facility experienced technical difficulties while converting to a new mercury monitoring system and reported excess mercury emissions as soon as it became aware of the issue. She also said the company believes it is in compliance with the pollution control equipment.