About 100 Waterloo North Hydro customers are without power in Elmira. The utility aims to restore power by 6:30.

Elmira residents face rolling blackouts Monday because a damaged Hydro One transformer is limiting power available to Waterloo North Hydro.

The utility asks customers to conserve power.

"We ask all customers in the town of Elmira to curtail any discretionary load," said Dave Wilkinson, the vice president of operations with Waterloo North Hydro.

"We're going to have one-hour outages and rotate that block around until we get the transmission back," Wilkinson said.

The utility blames a blown Hydro One transformer station that feeds power to Elmira.