Tesoro Corp. said its Kapolei refinery is operating normally after a power drop that caused the plant to report an equipment failure.

“Operations are currently running as normal,” Tina Barbee, a Tesoro spokeswoman at the company’s headquarters in San Antonio, said in an e-mailed statement. “This did not have any impact upon Tesoro’s ability to fulfill its regional product supply commitments.”

The 95,000-barrel-a-day Kapolei refinery reported an equipment failure at 12:05 p.m. local time Tuesday following a “power dip,” according to a filing with the National Response Center. Sulfur dioxide was released from a flare, the filing showed.

U.S. companies must notify the response center if they release hazardous substances in excess of reportable quantities according to the Comprehensive Environmental Response, Compensation and Liability Act, commonly known as Superfund.

Tesoro said Jan. 10 that it is seeking a buyer for the Kapolei refinery and selling 32 retail stations in Hawaii.