Energy

Hundreds of thousands of Hydro One customers still without power after massive storm slams Ontario

This past weekend, a major winter storm system hammered the Canadian province of Ontario, impacting nearly 1 million customers across Hydro One territory. Hydro One Limited, through its wholly-owned subsidiaries, is Ontario’s largest electricity transmission and distribution provider, boasting approximately 1.5 million customers, meaning roughly two-thirds felt the brunt of the storm. The utility says the damage is “the most devastating and widespread” since the Great Ice Storm of 1998.

Since the start of the storm on March 28 at about 11 pm ET, Hydro One estimates crews have restored power to more than 83% of customers, up from 80% as of Wednesday night, when about 192,000 were still in the dark. However, significant damage continues to be discovered as crews continue restoration. To date, at least 1,707 broken poles have been identified, and more than 1,100 have been replaced. Due to the nature of this storm, damage accumulated on power equipment over several days, and on some lines, crews have identified multiple types of repair work that need to be handled before power can be restored.

More than 115,000 customers in neighboring Michigan are still without power, down from more than 300,000 a few days ago. In some areas, particularly in rural northern Michigan, entire communities have been without electricity since Saturday.

Wednesday’s high winds, freezing rain, and thunderstorms made matters worse, affecting 9,000 Hydro One customers in southwest Ontario and another 21,000 in the central part of the province. The utility notes this most recent system also slowed restoration efforts and grounded helicopters. Today’s weather seems like it will cooperate, though, allowing restoration work to resume as planned. Hydro One anticipates having as many as four helicopters providing air support once the fog in the region dissipates.

As crews finish restoration in areas, they are being redeployed to support the hardest hit areas, which are Peterborough and the surrounding area, Orillia and the surrounding area, and Fenelon Falls.

A map of Hydro One’s service territory. Courtesy: Hydro One

Restoration in the hardest hit areas will continue in the coming days, according to Hydro One, which expects to have most customers back online by the weekend. In remote areas, particularly for customers who can only be reached by water, restoration may take longer. Road access continues to be a challenge in the most impacted areas, along with safety concerns of tree branches and limbs coming down.

Hydro One recommends that its customers turn off their stoves or any elements that may have been in use when the power went out. Since some areas are starting to be affected by flooding, customers should call 1-800-434-1235 to have power safely turned off if water starts to reach electrical outlets, baseboard heaters, or a furnace. Do not enter any flooded areas, such as the basement, until power is disconnected.

Outages as of Thursday morning

Regional breakdown of Ontario power outages per Hydro One on the morning of April 3, 2025
Operations centre  Restored outages  Number of customers restored (approximate) Active outages Number of customers without power (approximate)  Percentage of customers restored (approximate)
Fenelon Falls 179 57,333 521 33,218 63%
Peterborough (surrounding area)  172 60,501 497 33,164 64%
Ashburnham (Peterborough proper) 121 78,660 131 10,966 87%
Orillia (surrounding area) 60 30,669 407 19,484 61%
Couchiching (Orillia proper) 37 32,274 106 7,061 82%
Bracebridge 89 29,615 151 13,788 68%
Penetang 132 49,888 121 9,569 84%
Tweed 303 64,897 312 7,827 89%
Minden 72 36,998 153 7,982 82%
Barrie 144 45,730 218 9,177 83%
Bancroft 161 31,066 97 6,742 82%
Parry Sound 104 56,143 50 3,408 94%
Alliston  150 23,693 101 3,215 88%
Owen Sound 163 34,648 54 1,543 96%
Newmarket  266 40,974 169 880 98%
Kingston 312 36,906 7 286 99%
Bowmanville 176 17,278 14 1,760 91%
Walkerton 32 4,164 35 768 84%
Trenton 299 40,648 2 17 99%
Manitoulin 42 7,840 3 58 99%
Essex (active outages as a result of Wednesday’s weather) 11 487 4 382 56%
Huntsville 45 17,405 1 5 99%
Perth 30 2,527 3 207 92%
Winchester 18 2,327 1 1 99%
Brockville 96 19,004 5 191 99%
Orangeville 224 16,910 17 556 97%

Hydro One notes that the areas listed above do not align with conventional municipal boundaries since they are broken down by the utility’s operations centres.

Sending in Support

Hydro One is a member of the Ontario Mutual Assistance Group (OnMAG). OnMAG offers emergency coordination and best-practice sharing between the member Ontario electrical utility companies to bolster capabilities within the province.

Hydro One made a formal request for storm assistance through OnMAG and accepted Toronto Hydro’s storm assistance proposal, which will support restoration efforts in central and eastern Ontario by lending over 70 members of the Toronto Hydro skilled worker community.

“This weekend’s ice storm heavily impacted our neighbours in eastern and central Ontario, and we’re proud to offer our skilled workers to support power restoration efforts. Our crews are assisting Hydro One in restoring service to Ontarians as quickly as possible,” said Lauren Harris of Toronto Hydro.

Ontario’s chief utility and its subsidiary anticipate additional resources joining restoration efforts Thursday through OnMAG agreements, bringing its total to 3,800 Hydro One team members, contractors, and other resources on the ground. At least 18 Local Distribution Companies (LDCs) are providing mutual assistance, including: Alectra, Bluewater Power, CNP Fort Erie, Enwin, Entergus, Epcor, Essex Power, ERTH, Grand Bridge Energy, Hydro Ottawa, Kingston PUC, Lakefront Utilities, London Hydro, Milton Hydro, Niagara Peninsula Energy, Oshawa PUC, Renfrew Hydro, and Toronto Hydro.

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