COLLEGE STATION, Texas Power crews say it could take weeks to find out exactly what caused a current transformer to blow, knocking out power to thousands of customers in College Station.
It all happened early Thursday night at the Greens Prairie sub station.
"We had a current transformer that failed last night in the field and it caught fire," said Paul Buckner with Bryan Texas Utilities. "It contains oil, and the oil caught fire and caused that smoke ring."
The smoke ring was seen for miles around town.
"Just sounded like a big pop. And we came out a couple of seconds later and found like a big ring of smoke," said Sid Backstrom, who lives in the area.
Buckner said even though College Station felt the sting of the failed transformer, the city of Bryan owns and runs it. A safety shut off was the reason power was cut to College Station customers.
Crews were able to act fast and managed to get power back on in about an hour.
Buckner said the transformer was tested about two months ago by both BTU and the Texas Municipal Power Agency.
Power officials are investigating the cause of the failure, but said it could take a couple of weeks to figure things out.
No one was at the sub station at the time of the fire.