texas blackouts 2021

Don’t snow on Texas: diving into the 2021 blackouts

Much has already been written about this week’s power outages in Texas, and the devastating impact they’ve had on the millions of people who are left in the dark and the cold. Unfortunately, a large portion of the original reporting about the cause of the blackouts contained misinformation. So we want to join the growing chorus of articles setting the record straight on what actually happened in Texas, as well as to take a look at how to prepare to keep the lights on during severe weather events in the future. 

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So, what happened in Texas?

As a quick recap, beginning Sunday, February 14th, the entire American South–including Texas–was plunged into a deep freeze as arctic conditions managed to escape the polar vortex (remember that?) and head to southern latitudes. In an ironic twist of fate, scientists believe that the arctic blast is at least partially attributable to climate change: abnormally warm conditions above the Arctic weakened the climatic system that typically keeps cold temperatures isolated above the North Pole, allowing them to seep to lower, more populated locations. 

As record low temperatures were set across the region, and within Texas in particular, demand both for electricity and for natural gas for heating increased rapidly but, for a number of reasons that we’ll expand upon below, power plants in Texas couldn’t meet that need, ultimately leaving more than 4 million customers without electricity in the Lone Star State.

What are the main causes of the Texas outages?

While many initial reports looked for one silver bullet that was responsible for leaving millions of Texans in the dark, the real answer is more of a perfect storm of scenarios. There are a few key factors that contributed significantly to the outages:

The Lone Star State has a lonely grid

The first thing to know about electricity in Texas is that the state runs its own electrical grid. This may not sound particularly remarkable–New York has its own grid operator too after all–but the devil’s in the details. Not only does Texas operate it’s grid, the state’s electrical grid is separate from the rest of the country’s electrical system. 

As seen in the image below from the DOE, the entire Eastern part of the country is one interconnected electrical grid, as is the Western part of the country. Texas, meanwhile, has its own “interconnection”, the Electricity Reliability Council of Texas Interconnection (ERCOT). The transmission topology of Texas is important because it means that they’re entirely self reliant–if something goes wrong, they’re largely out of luck, and can’t call on other states for help. In New York, on the other hand, if multiple of the state’s power plants can’t operate, New York can get extra energy from Pennsylvania/New Jersey, New England, or even from Canada. 

north american interconnections map

Texas plans for a summer, not a winter, peak

Every region plans for their “peak” period, i.e., when demand for electricity is the highest across the state. In a state as hot as Texas, the region plans for a summer peak, generating a sophisticated forecast of what demand could be under different weather conditions. For instance, in a hot year, if everyone in the state has their air conditioning units on at the same time of the same day of the year, the peak demand will be higher than if it’s a cooler weather year when people don’t run their air conditioners as frequently. 

The trouble is that Texas didn’t plan for the entire state to be in a winter warning at the same time. (And really, why would they – this was the first time it’s ever happened.) But that meant that the Texas electrical grid wasn’t designed with a winter storm event in mind.

Power plants expected natural gas; it went to homes (or froze) instead

A significant portion of Texas’s electricity generation comes from natural gas power plants: according to a 2020 report from ERCOT, nearly half of the state’s electricity is produced by natural gas. 

During cold snaps, though, natural gas is not only needed by power plants, but also for home-heating needs. The US Energy Information Administration (EIA) says that natural gas is the primary heating fuel for more than a third of households in Texas. So when the temperature drops, like it did this week, natural gas power plants are competing for natural gas supply with home heating needs.

But natural gas contracts (and pipeline regulations) are typically structured to meet home heating needs first, before sending additional natural gas to power plants. By all reports, that’s what happened this week: natural gas was diverted to home heating, and away from power plants, leading to outages at natural gas plants. 

Also, for what it’s worth, some interesting reports indicate that mechanisms that keep natural gas pipelines functional (like compressors) froze, and the temperature was so cold that liquids literally froze inside of pipelines and in wells, which also contributed to its lack of availability. 

Yes, some wind turbines froze, but don’t blame wind

All energy sources were adversely impacted by the deep freeze in Texas. However, a number of the first headlines about the outages–including from major outlets, like the Wall Street Journal–placed the blame for the outages solely on wind turbines. This is a red herring and a misdirection.

Yes, some wind turbines froze. But wind actually produced more electricity than it is expected to this time of year, according to ERCOT as per Bloomberg

Some observers have pointed out that despite having nearly 30 megawatts of wind resources in Texas (more than any other state!), the operator only expects about a quarter of that to be operating in the winter. There is definitely a discussion to be had about how to design an electric grid that takes advantage of the seasonal perks of different types of electricity as we continue to move towards a cleaner grid, but that’s not ultimately the cause (or even a major contributing factor) to what happened here: ERCOT planned for a certain amount of wind production, and got most of it, but was primarily let down by coal and natural gas units.

Can what happened to Texas happen elsewhere in the US? 

It already has! But the regions where this type of event has happened in the past learned from the outage event and adapted the grid so that it wouldn’t happen again (or would at least be less likely to occur in the future). 

The best example is up here in New England: in 1965, a November snow storm plunged much of the region into darkness. (Don’t take my word for it, I wasn’t there.) In response, the region created a power pool to share resources with a central power dispatcher. Ultimately, that meant that in 2003, when blackouts hit much of the eastern part of the country, the Northeast was largely spared from the blackout (ISO-NE’s words, not mine). So it is possible to learn from what happened and build a more resilient grid to better withstand extreme weather events like the arctic cold snap in Texas this week. 

For those energy wonks out there, there’s a certain level of risk that grid operators have deemed acceptable. In most places in the country, the grid is designed to a “one-day-in-ten” standard. This means they plan on having system-wide outages no more frequently than one day out of every ten years. If you planned more conservatively than this, the cost to the system would be unacceptably high. All of which is to say that blackouts aren’t common, but it’s expected under common grid planning practices that they will occur about once a decade.

How to avoid blackouts

There’s one clear way to ensure your home has electricity even when the rest of the grid doesn’t: installing a solar plus storage system. When you pair a solar plus storage system, whatever electricity from your solar panels you don’t use during daylight hours goes towards charging your battery, which then powers your home through the night until the sun rises and the process repeats the following day. Most batteries provide more than enough power to keep your essentials running–think lights, refrigerators, wifi, and chargers–for multiple days, while some of the larger systems can power more of your home for longer (at a higher cost). 

Now you may think, “Hold on…if the solar panels are covered in snow, they won’t work, right?” This is true, but only to a certain extent: solar panels won’t operate when they’re still covered in snow, but they shed that snow faster than your roof typically would, meaning the snow will slide off your glass panels pretty soon after the storm, especially if the sun is up. As a solar owner in a snowy climate, I can attest to this–it’s sometimes a bit frightening to hear the mini-avalanche slide off the panels on my roof, but it’s reassuring to know how quickly they are back to powering my home.

Get peace of mind with solar + storage

If you’re looking for the peace of mind of knowing that you’ll have power even when the grid goes dark, you can take the first steps towards improved resiliency for your home today by registering for an account on EnergySage. We do the hard work of screening installers in your area and of gathering you quotes, so you can compare your options all from the comfort of your couch without ever picking up the phone. Sign up for a free account today to see what solar and storage  can do for you.

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About Spencer Fields

Spencer is the Technology & Product Alliance Strategic Lead at EnergySage, where he wears many hats. A 10-year industry veteran (and a solar owner himself!), Spencer spent five years at Synapse Energy Economics before joining EnergySage, providing environmental, economic, and policy analysis for public interest groups. These days, he leads market and consumer intel and research for EnergySage. Spencer has degrees in Environmental Studies and Hispanic Studies from Brown University.