UPDATE 2-Three Utah refineries restart after power outage

* Silver Eagle refinery blast triggered brief power outage

* Chevron, Holly, Flying J refineries restarting

* Tesoro refinery operating normally

(Updates with further Tesoro statement, Holly output)

HOUSTON, Nov 4 (Reuters) - The Chevron Corp (CVX.N), Holly Corp (HOC.N) and Flying J refineries near Salt Lake City, Utah, were restarting units after a brief power outage knocked all or parts of the plants offline on Wednesday morning, the companies said.

The power outage occurred after an explosion at the Silver Eagle refinery in Woods Cross, Utah, about 10 miles (16 km) north of Salt Lake City. No one was injured. [ID:nN0426833]

Only Tesoro Corp's (TSO.N) 60,000 barrel-per-day (bpd) refinery in Salt Lake City experienced no interruptions.

"We have had no operational issues at the refinery," said Tesoro spokesman Lynn Westfall.

Chevron Corp's 45,000-bpd Salt Lake City refinery "did have some units go offline," said refinery manager Mark Sullivan, who declined to identify the units. The refinery was restarting using normal procedures.

The 29,400-bpd Flying J refinery "had a few pumps go down" and was restarting, said spokesman Joel Elstein. There was no material impact to production.

All units at the 25,050-bpd Holly refinery in Woods Cross were shut by the power blip, said spokesman Mike Astin. At least two of the units had restarted by late morning.

The blast at the Silver Eagle refinery knocked nearby houses of their foundations and was heard for miles away, said Jeff Bassett, deputy fire chief of the South Davis Metro Fire Department.

The explosion occurred when liquid containing diesel and hydrogen that had been released from a pipe flowed along the ground to furnace, which ignited the mixture, according to a preliminary investigation, Bassett said..

"The power outage, which was a blip or a bump, was a secondary effect of the explosion," he said. (Reporting by Erwin Seba; Editing by Lisa Shumaker)