A Minnesota energy company says it will contest the $21,000 in fines leveled against it by the state’s OSHA for an incident at the company’s Becker power plant that left three workers with severe burns over large portions of their bodies.

The workers were injured by an arc flash and electrical explosion which occurred while they were investigating a breaker failure. They were rushed to a local hospital, where they were treated in its burn unit.

Xcel Energy was cited for three serious safety violations in connection with the incident. The company is the state’s largest utility.