Suncor says oil sands base plant returning to operations after power outage
* Suncor Energy experienced process upset at oil sands base plant in northern Alberta due to temporary power loss – company spokeswoman
* Suncor spokeswoman says power was restored on Wednesday night and company is currently focused on a safe return to operations
* Suncor did not comment on production impact at the 350,000-barrel-per-day mining and upgrading site
(Reporting by Nia Williams; Editing by Sandra Maler)