Government spokesman Barrie Harrison says the man who died Sunday was a 27-year-old Suncor electrician who was working near electrical panels on the worksite.
His identity and the official cause of his death have not been released.
Suncor has said the man was severely injured and was pronounced dead in hospital in Fort McMurray.
Investigators have issued a stop-use order for the electrical panels as they try to determine what happened.
They will be looking to see if there was an equipment failure, and are reviewing what the man was doing, the company's work rules and what kind of training he had.
"We will be looking at every possible angle," Harrison said.
"We owe that not just to this worker, but to his co-workers and his family and friends. We want to find out what happened in this circumstance so it doesn't happen again."
This is the second death of a Suncor employee at the worksite this year.
In January, tailings operator Jerry Cooper's body was found submerged in a sand dump at the worksite.
Suncor officials were not available for comment Monday.