An Arctic blast that’s sweeping through North America is heightening the risk of blackouts. With more cold still in the forecast, electric grids from Texas to Alberta will continue to be under strain.

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(Bloomberg) — An Arctic blast that’s sweeping through North America is heightening the risk of blackouts. With more cold still in the forecast, electric grids from Texas to Alberta will continue to be under strain. 

In Texas, which is facing one of its biggest grid tests since deadly winter blackouts in 2021, power demand on Sunday from homes and businesses is expected to hit a winter record of more than 78 gigawatts — and then later in the week possibly set an all-time record. Still, state officials have said they aren’t anticipating a grid emergency.

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In Washington State and Alberta — where more than 1 million people saw Calgary temperatures at noon local time below minus 20F (-29C) — utilities and grid operators have been making pleas for consumers to conserve energy.

Already, more than 300,000 US homes and businesses were without power Sunday, with outages concentrated in Oregon, Michigan and Pennsylvania, according to PowerOutage.us, a website that tracks utility outages. In Texas, there were more than 15,000 customers without power as of 1:52 p.m. Dallas time. 

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Cold can hobble electric grids in two ways. First, the teeth-chattering temperatures prompt people to crank up their heat, sparking a demand surge. At the same time, the extreme conditions can also mean that energy supplies get disrupted as freezing weather can cause temporary shut downs or production curbs.

A natural-gas storage facility that can serve 25% of the peak energy needs of the Pacific Northwest shut down unexpectedly on Saturday, triggering conservation alerts from local utilities. The facility was in the process of coming back online Sunday, according to a notice.

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On Friday, US natural gas futures settled at the highest in more than two months amid the weather concerns. One bright note is that US inventories are well stocked as demand for the heating fuel had been dampened by relatively mild winter weather until now.

Texas is a particular focus because the current blast is one of the few freezes to hit the state since an extremely cold system in February 2021 killed more than 200 people and left millions blacked out for days amid failures in the state’s power and natural gas infrastructure.

The Electric Reliability Council of Texas, or Ercot as the state’s main grid operator is known, had previously set a wintertime demand record of 74.5 gigawatts during a cold snap in December 2022. It recorded an all-time high of 85.5 gigawatts in August, which will likely be challenged by this week’s freeze.

The Texas grid will be most strained on Monday and Tuesday mornings, when recent estimates showed demand exceeding supplies starting around 7 a.m. These forecasts are volatile. Power usage is currently expected to climb to almost 83.6 gigawatts on Jan. 15 and then to an all-time high of 85.9 gigawatts the next day. 

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Texas, known for its blazing hot summers, has never set an all-time demand record in winter.

“Anytime we get these cold shots in Texas, the electric grid is going to be in heightened alert,” said Tyler Roys, a senior meteorologist at AccuWeather Inc. “What makes it trickier this week is there’s going to be ice across central and eastern Texas.” He expects the ice to start Sunday afternoon and extend into at least midday Monday.

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Texans awoke Sunday to freezing temperatures that promises to drive up power demand through at least Tuesday. The Dallas area is projected to see highs of about 20F on Sunday, 25F on Monday and 27F on Tuesday, before rebounding to 44F on Wednesday, according to the US National Weather Service.

Ahead of winter, Texas Governor Greg Abbott and Ercot Chief Executive Officer Pablo Vegas said reforms in the aftermath of the 2021 freeze would ensure sufficient electric supply. But some critics of the operator have contended the reforms tacked on billions of dollars in costs without meaningfully boosting reliability.

Power generators “have never been as prepared for a winter event as they are today, including having a secondary source of fuel available,” Abbott said on Friday. 

—With assistance from Elizabeth Elkin, Ruth Liao and Mark Chediak.

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