Alberta’s electrical grid stood at the brink of blackouts Jan. 13, before pulling back in the nick of time

Second evening in a row Alberta sees “grid alert” issued, but this time, it was a much closer-run thing

Alberta’s electrical grid was in such peril of falling into rotating blackouts on Saturday night, the provincial government urged people to even turn off their bathroom fans, among other things.

Turning off kitchen or bathroom ventilation fans, washers, dryers and dishwashers, charging electric vehicles and/or plugging in block heaters, even using a laptop instead of a desktop computer were all suggested to relieve the pressure on the grid. And beyond unplugging vehicle block heaters, the government suggested delaying charging electric vehicles, years before the province sees the deployment of millions of electric vehicles, which the federal government intends on forcing upon Canadians by 2035.

With temperatures again well below -30 C in areas of the province (as well as its neighbours in Saskatchewan and Montana), the Alberta Electric System Operator (AESO) issued its second “grid alert” in two days at 3:30 p.m., Saturday, Jan. 13.

At 4:14 pm., the AESO posted on X, “The AESO has declared a Grid Alert due to extreme cold, high demand and low imports. Please reduce your electricity use to only essential needs, to lower demand and minimize the potential for rolling outages this evening.”

Three hours earlier, they posted on X, “It’s still a chilly one out there! Our System Controllers remain on top of it, managing Alberta’s electricity network 24/7 to keep the power flowing. We also thank our industry partners for working to keep the lights on. You can help, too, by conserving power 4-7 p.m.”

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Natural gas and a bit of coal kept the lights on

The vast bulk of Alberta’s power generation was coming from natural gas and some coal, with nearly every fossil fuel-fired generating unit running flat out. A notable exception was H.R. Milner, which was producing only around one tenth to one quarter of its 300 megawatt capacity. That was the unit whose lack of operation the day before was one of the reasons Alberta had a grid alert on Jan. 12. Other reasons included the bitter cold driving demand and near total lack of wind and solar generation.

Wind power throughout the supper hour remained around the 90 to 130 megawatt range, or two to three percent of installed capacity. Only eight of Alberta’s 45 wind farms were producing any power at 5:54 p.m. Most were shut down because temperatures below – 30 C run the risk of cold brittle behaviour of materials, meaning components could shatter.

However, a those few wind farms producing power by 9 p.m. were doing so despite the -34 C ambient temperatures. Blackspring Ridge, near Lethbridge, was one of the last to shut down on Jan. 11 as temperatures fell below -30 C, but was one of the few wind farms to produce power on Jan. 13.  It, Sterling Wind and Whitla 1 produced most of the wind power that evening, while most of the rest of the fleet had zeros.

Solar was producing no power, as the sun was over New Zealand while supper was being served in Edmonton.

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Contingency reserve razor thin

Generally speaking, power needs to be consumed at the instant its produced. There is very little in the way of grid-scale storage in the Canadian electrical grid, although Alberta has built 10 grid-scale batteries totaling 190 megawatts capacity. All of that capacity would come into play Saturday evening.

Grid operators must maintain a small amount of excess capacity at all times, known as a “dispatched contingency reserve” (DCR) The North American Electric Reliability Corporation (NERC) standard is to maintain at least 4 per cent DCR. That’s because if the DCR runs out, all sorts of bad things happen, with voltage drops and frequency variance which then can lead to cascading brownouts, including additional power generating units tripping off and whole areas going without power.

With demand hovering around 11,800 megawatts, four per cent would have been around 472 megawatts DRC. Instead, for the better part of an hour, the DCR was 20 megawatts, or 0.1 per cent.

As the supper hour went on, and contingency reserves flatlined, nine of Alberta’s 10 grid-scale batteries were called into service. Three had been providing low levels of output – four or five megawatts each, for the 6 o’clock hour, the pattern they had been exhibiting since Dec. 20. But the other six 20 megawatt batteries were put online as well, an exceptionally rare occurrence.

This is a main part of their purpose. Usually they are listed on the dispatched contingency reserve, but rarely called upon, even when wind and solar power flatline. This time, it was all but one of the batteries on deck. They were at times providing 126 megawatts of power to the grid. And the tenth was called upon right after that. Even with nine batteries being drawn upon, there  was still were only 20 megawatts of contingency reserve left on the board, from the strained natural gas generation.

 

At this time, hydro capacity was running full out. Alberta almost always keeps at least 100 megawatts of hydro capacity in reserve. But at 5:54 p.m., all 401 megawatts of hydro available were producing to the grid. (While Alberta has a theoretical maximum capacity of 894 megawatts of hydro, that depends on all dams being full, and southern Alberta has been experience pronounced dry conditions of late.)

Past performance has shown these batteries typically only output full power for about an hour. With no hydro left and as that hour drew to a close around 6:20 p.m., and the contingency reserve remained at 20 megawatts of gas, the AESO was in the process of taking things up a notch.

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Alert system activated

A call went out from the Alberta Electric System Operator and the Government of Alberta to conserve power immediately.

Around that time, an emergency alert was pushed to all cellphones in the province, as well as on TV screens. It stated:

“EMERGENCY ALERT/ALERTE D’UGENCE

“This is an Alberta Emergency Alert issued by the AEMA. This alert is in effect for AB. Extreme cold resulting in high power demand has placed the Alberta grid at a high risk of rotating power outages this evening. Albertans are asked to immediately limit their electricity use to essential needs only. Turn off unnecessary lights and electrical appliances. Minimize the use of space heaters. Delay use of major power appliances. Delay charging electrical vehicles and plugging in block heaters. Cook with microwave instead of stove. For more info vising the Alberta Electric System Operator website.”

Screenshots of this alert soon flooded Albertans’ social media.

On X, the AESO suggested Albertans read their press release on their website, AESO.ca, and then the website crashed shortly thereafter, and did not appear online again until after the alert was over. It posted, “Albertans are asked to immediately reduce their electricity use to minimize the potential for rotating outages across the province. See our media release: Albertans Asked to Conserve Power to Minimize Potential for Rotating Outages  » AESO”

The AESO press release said:

“Currently, the AESO projects the Alberta grid will face a 100 to 200 MW shortfall of electricity during peak evening hours. Immediate power conservation could make a significant difference in reducing overall system demand, currently at approximately 12,000 MW. To put these numbers into perspective, tonight the City of Calgary will be drawing approximately 1,650 MW of electricity, and, if rotating outages are implemented, will need to reduce power by approximately 50 MW.

“Rotating outages mean that some power will be temporarily out in different parts of the province until sufficient generation returns to the grid or power demand declines enough that the AESO can rebalance supply and demand.

“In the event of a rotating outage, the AESO directs Distribution Facility Owners (DFOs), such as municipalities, to reduce power on a pro-rata basis across the province. Outages will occur simultaneously across Alberta. Critical facilities such as hospitals, fire, police and first responders are not included in rotating outages. Each DFO manages rotating outages at their level. Each rotating outage is expected to last approximately 30 minutes at a time and could be implemented shortly.”

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Alberta Premier Danielle Smith put out the following statement via various social media at 6:46 p.m.:

Minister of Affordability and Utilities Nathan Neudorf issued the following statement in response to an electrical grid alert from the Alberta Electrical Systems Operator:

We are calling on all Albertans to reduce their electric demand immediately to essentials only. Extreme cold resulting in high power demand has put the province’s electricity grid at high risk of rotating outages tonight.

On top of high demand of our own energy generation, Alberta’s grid receives electricity from neighbouring provinces. Extreme weather in Saskatchewan and British Columbia is impacting electricity sharing, which is also a contributing factor to tonight’s grid alert. The Alberta Electric System Operator has activated its emergency grid management plan to work with local distribution utilities to avoid potential rolling brownouts.

Here are some easy ways to conserve electricity this evening and into the night:

• Turn off unnecessary lights and electrical appliances;
• Minimize the use of space heaters;
• Delay the use of major power-consuming appliances such as washers, dryers and dishwashers;
• Delay charging electric vehicles and/or plugging in block heaters;
• Cook with your microwave, crockpot or toaster oven instead of an electric stove or oven;
• Limit the use of kitchen or bathroom ventilation fans;
• Work on a laptop instead of a desktop computer (laptops are more energy-efficient than desktop units);
• Unplug electric appliances when not in use, as they continue to drain energy even if they’re off (or use a power bar to cut power to multiple appliances with a single button);
• Close your curtains/shades/blinds to cover drafty windows.

Albertans have a history of pulling together in times of emergency. If we all make small changes like those listed above, we can keep each other safe through another extremely cold evening.

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At that point, Saskatchewan was already giving Alberta all it could, with SaskPower sending 153 megawatts, pretty much the maximum Saskatchewan ever supplies Alberta, from over a year of observations.

On various social media, Saskatchewan Premier Scott Moe posted a screenshot of the Alberta alert that went out to cellphones in that province, saying, “SaskPower is providing 153 MW of electricity to AB this evening to assist them through this shortage. That power will be coming from natural gas and coal-fired plants, the ones the Trudeau government is telling us to shut down (which we won’t).”

While Saskatchewan was contributing its maximum, the same could not be said of British Columbia and Montana, both of which were in the deep freeze as well. Throughout the evening, the flow between Alberta and Montana hovered close to zero. British Columbia was contributing 226 megawatts, which may seem like a lot except that over the past year at times over 700 megawatts have flowed either direction over the Rockies.

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The emergency alert worked

In the half hour after the alert went out, power production did not rise, but the load dropped by roughly 400 megawatts. Those 400 megawatts showed up on the beleaguered dispatched contingency reserve, which rose to around 405 megawatts. That, in turn, put the province close to its required 4 per cent.

It wasn’t so much production increased as demand dropped as the populace responded to the alert.

At 7:57 p.m. Smith posted on X: “Albertans are amazing! I want to thank everyone who is helping by reducing your electricity use during this time. Please continue to help by watching your power usage over these next couple of days.”

 

Five hours and 10 minutes after it the grid alert was declared, it ended, at 8:40, according to the AESO’s event log. Soon afterward, the AESO posted as much on X.  A few minutes earlier, they posted, “Thank you, Alberta! Your conservation efforts quickly reduced electricity demand and the risk of rotating outages. A special shout out to our System Controllers, industry partners and the Government of Alberta for keeping the power flowing and all Albertans safe and warm tonight.”

 

Later that night, the AESO put out a press release thanking Albertans. “The province-wide response to the call for energy conservation was tremendous,” said Mike Law, president and CEO of the AESO. “On behalf of the AESO, I would like to extend my thanks to all Albertans who responded to the call for action, which ensured we didn’t have to progress to rotating outages, keeping our grid up and running for all Albertans.”

And while Alberta endured grid alerts two days in a row, it’s not over. The release ended, “With extremely cold temperatures forecast through tomorrow, the AESO requests that Albertans continue to conserve energy during the peak demand period from 4 p.m. to 7 p.m.”

 

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