Salt Lake fire and hazardous materials crews Friday night extinguished a fire that began in a Utah Power & Light Co. transformer.

"Something blew up. We have no idea what caused it and we'll have no idea until we can get in there and tear it apart," said Rick Heal, a lineman with the utility company.The fire began at 11:45 p.m. and it took crews about 30 minutes to extinguish the blaze, said Battalion Chief Dick Kleine.

The "oil-cooled transformer, at least 1,000 gallons of oil in it" was located at about Second South and 16th West, Kleine said.

Kleine said crews poured dry powder on the transformer, but the metal on the transformer was so hot that the fire flared up again. A special foam was then poured on, which put out the flames and cooled the metal.

"I probably imagine it's going to steam and smoke the rest of the night," he said.

The fire bumped power along North Temple from about Fourth West to 15th West. Among the blacked-out buildings was the Rose Park fire station. Power was restored about 45 minutes after the blaze began.