A hydro worker was killed Wednesday in southwestern Ontario while working on a power line damaged by superstorm Sandy.

The worker, whose name has not been released, was electrocuted while tending to a downed power line in Sarnia, said the Ontario Labour Ministry.

The ministry is investigating the incident, which occurred around 11 a.m.

Bluewater Power CEO Janice McMichael Dennis told Sarnia radio station Blackburn News that it is an "unbelievable" shock.

"As you can imagine his family is grieving and we are grieving here as his family," she said. "It is an unspeakable tragedy."

Provincial Energy Minister Chris Bentley took to Twitter to extend his condolences to the worker's family.

"Thoughts and prayers with family of Hydro worker killed in Sarnia," Bentley wrote.

It's the second known death in Canada related to Sandy. A Toronto woman was killed by a fallen sign on Monday.

Southern Ontario was hit hard Monday and Tuesday by strong gusts of wind from Sandy. The wind warnings continued in Sarnia after they were cancelled in the rest of the province.

The region experienced winds of up to 100 kilometres per hour throughout Tuesday.