Alectra Utilities says more than 600 customers are still without power in Richmond Hill, while over 900 are affected in Markham.

The Richmond Hill outage has been attributed to equipment failure, while the Markham outage was caused by trees coming into contact with power lines.

The outages come at an inopportune time with temperatures soaring into the mid 30s on Thursday.

Richmond Hill is currently under a heat warning that extends into Friday.

Estimated time of full power restoration is by 10 p.m. in Richmond Hill. No estimate has been given for the Markham outages.

Hydro One is also reporting numerous outages due to storm activity especially in areas around Georgian Bay.

Our crews are working as quickly and safely as possible to assess damage and restore power as thunderstorms move through parts of southern and central Ontario, impacting areas near Georgian Bay. Customers are encouraged to prepare for outages as the weather moves southeast this… pic.twitter.com/uhCiVbPph4

— Hydro One (@HydroOne) July 24, 2025

“Crews are responding to outages as quickly and as safely as possible as thunderstorms move through parts of southern and central Ontario,” a statement on the Hydro One website said.

“Stay clear of any fallen power lines. If you spot a fallen line, keep at least 10 metres back, even if it does not appear to be live. Report it to 911 and call Hydro One at 1-800-434-1235.”