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No matter where you live, you should be prepared to live without power during extreme heat.
What keeps emergency management officials up at night? Terrorist attacks. The Big One. A direct hit from a Category 5 hurricane.
But when it comes to climate-related disasters, one fear often rises above the rest: a blackout during a heat wave.
According to new research published this spring, a two-day citywide blackout in Phoenix during a heat wave could lead to half the population — some 789,600 people — requiring emergency medical attention in a metropolitan area with just 3,000 available beds. As many as 12,800 people could die, the equivalent of more than nine Hurricane Katrinas.
Power outages can happen during a heat wave for a number of reasons. The most obvious is because of strain on the power grid, as everyone cranks up their air conditioning at the same time. By one estimate, “two-thirds of North America is at risk of energy shortfalls this summer during periods of extreme demand.” Blackouts can be both city- and state-wide, like when 11 million people were without power following a deadly grid failure in Texas in 2021; or rolling, to prevent a more catastrophic failure; or localized, like when a wildfire takes down transmission lines.
Storms can also knock out power, cutting off access to life-saving air conditioning. Excessive heat killed 12 nursing home residents in Florida in the aftermath of a 2017 hurricane, the same year that hundreds died in Puerto Rico after Hurricane Maria lead to a months-long blackout.
There’s another possibility that has been quietly discussed by emergency officials, too: a malicious cyberattack that takes down the grid during a time of extreme heat. “What happens when a cyberattack disables access to electricity for weeks, coordinated with record-breaking heatwaves, which are significant public health concerns in themselves?” a 2021 piece in The American Journal of Medicinemused, only to conclude that “the impact on the health-care system” — including hospitals, which can run on generators but would be quickly overwhelmed — “would be catastrophic.”
So if the power goes out during a heat wave, what do you do?
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No, you’re not psychic: You can’t predict when a power outage will leave you without your AC. But you are an informed person who’s aware that heat waves are becoming more common and intense and that extreme heat is the deadliest weather phenomenon in the United States. Virtually every American can benefit from having a plan in place for how to deal with extreme heat in the absence of AC, since nowhere is climate-proof.
At the most basic, the emergency agencies that informed this article — primarily American Red Cross, Centers for Disease Control and Prevention, and Ready.gov, all of which can be consulted for further resources — say you should have an emergency kit prepared and up to date in your home, and sign up for emergency alerts. (Also prepare a separate emergency kit for your pets if you have any.) This should include directions to your local cooling center in addition to a hospital.
Next, “Take an inventory of your essential electrical needs,” advises the American Red Cross. “Then consider how you would live without them when the power goes out.” That list might include backup batteries for phones, fans, CPAP machines, or any other medical devices.
Also consider buying misting spray bottles (we’ll get to those later) and a cooler where you can stash food if the refrigerator goes down. Battery-operated fans can additionally be useful to have on hand, particularly in humid areas, despite many public health organizations warning against them. Extra gallons of water are a part of every emergency kit, and important to have on hand as well.
Finally, make a habit of checking in on the vulnerable people in your life ahead of time — in particular, older people who live alone — and confirm they have air conditioning units that are working. Of the 72 people who died in Oregon's Multnomah County, which makes up the bulk of the city of Portland, during a heat wave in 2021, only three were found to have a functioning AC unit.
The first thing you want to do if the power goes out during a heat wave, regardless of how severe you anticipate the situation being, is prevent the loss of whatever cool air there still is inside your house. At the most basic, this means covering your windows to keep out sunlight by drawing the blinds.
If you anticipate the power being out for more than a few hours — perhaps because one of the emergency alerts you signed up for warns you the blackout could last for days — take more dramatic measures, like using blackout curtains if you have them, or reflective, foil-covered pieces of cardboard in the windows to bounce heat off your home. The most important thing, though, is to get the windows covered with something; even a towel will do if you don’t have drapes or blinds. If you have a multi-story home and anticipate a long-lasting power outage, begin to shut upstairs doors (hot air rises!) with plans on keeping those rooms closed off for the duration of the blackout. Any particularly drafty doors or windows can be further sealed with a rolled-up towel. In a worst-case-scenario event, you’ll be staying downstairs until your air conditioning turns back on, so keep that in mind as you move through the rooms.
As you’re making your sweep, also snag any medications you have stored, since heat can alter their efficacy. Many meds will become less potent or altered when exposed to high temperatures; aspirin, for example, breaks down into acetic acid and salicylic acid, which can upset the stomach.
Preventatively turn off and disconnect appliances, too, in order to avoid damage from a surge when the power returns (this is generally good advice no matter what the blackout conditions are). Then establish yourself in your darkest, coolest room — it’s likely on the north side of your home or apartment. Generally avoid south-facing rooms, followed by east- and west-facing rooms, since they get the most sunlight. Hunkering down in the basement is also potentially a good option.
Keep your refrigerator closed until about four hours have passed, at which point you should move the contents and stash them in a cooler. A full freezer can stay at a safe temperature for up to 48 hours, but as FoodSafety.gov will remind you, “when in doubt, throw it out.”
We know dangerously little about how indoor heat works. But we know that it kills — studies have found that people are most likely to succumb to heat-related illnesses in their own homes.
As a rule of thumb, if your body is exposed to temperatures of 90 degrees or higher, you are potentially at risk of heat exhaustion, which can lead to heat stroke, the National Weather Service notes. Keep in mind, though, that it can “feel like” 90 degrees when the temperature on the thermometer is as low as 86 degrees, because of humidity. If your home starts to feel hot, pay close attention to both the indoor heat and humidity and consult the NWS’s heat index to understand your risk.
Prolonged exposure to high temperatures increases the strain on your body and the danger of heat illness. While 90 degrees might be technically survivable for a healthy adult, “the temperature needs to drop to at least 80 degrees for” the body to begin to recover from extreme heat, CNN reports — part of why overnight highs can actually be deadlier than daytime highs.
Keep in mind your own vulnerabilities to heat, too: The elderly and the prepubescent are most at risk, but people taking antidepressants, antipsychotics, anticholinergics, diuretics, and ACE inhibitors can all have severe heat intolerance, too, Yale Climate Connection observes. Additionally, the publication notes, certain diabetes medications, including insulin, can be less effective when exposed to high heat. People with heart disease, kidney issues, or diabetes should be especially cautious about their health during heat waves because of the intense strain on these systems.
If the temperature starts to climb inside your home during a power outage, it is imperative to act quickly to stay healthy. Drink lots of water, but do so consistently, not in guzzling bursts; we’re limited in how much water we can absorb by how fast our kidneys can function. In extreme conditions, the body can absorb up to a liter of water per hour, but it’s often much less. It’s more important, then, to sip continually throughout the day.
If you have the option to do so, spend as much time in air-conditioned spaces as possible, particularly in the afternoon — movie theaters, malls, public libraries, community lake or pool, and friends’ and family’s homes in an area with power are all potential options. Cooling centers are also a terrific option since they are free, can be equipped with backup generators, and may have other resources handy to help you beat the heat.
But let’s assume, for whatever reason, these options are unavailable. Many cooling centers, including most of those in Los Angeles, for example, do not have backup generators, and they can quickly become crowded — one study that looked at Atlanta, Detroit, and Phoenix found that at most, 2 percent of the city population could be accommodated by existing cooling facilities.
Water, then, becomes your best friend. The evaporation of water from our skin helps pull heat away, so begin a regime of keeping a sheen of water on your skin, whether that’s by using a handheld mister or by placing cool wet towels on your body (the head and neck, armpits, and groin are the warmest parts of our bodies, so focus your efforts there). This is an especially good technique if you have a battery-powered fan to sit in front of. Though fans get a bad rap for creating “a false sense of comfort,” in the words of Ready.gov, used properly they can absolutely help — just keep in mind they stop working very effectively once it’s above about 95 degrees.
Showers can help keep you cool too, just don’t be tempted to take an especially cold one; as Popular Science explains, you don’t want to reach the point of shivering, a response that counterproductively increases our internal temperature.
Switch into light, airy clothes and avoid physical activity as much as you can. At night, keep an eye on the temperature; if it’s cool enough outside, open all your windows to create a cross-flow of air, but be sure to close your windows up after temperatures begin to climb again in the morning.
Pay attention to how your body is responding and know the symptoms of heat exhaustion and heat stroke (we have a guide for that here). Typically the first signs are cramps, headaches, or dizziness.
If you begin to feel too hot or sick, it’s time to evacuate your home. Heat illness can go from “uncomfortable” to deadly within 90 minutes, so it’s better to act decisively and get to safety rather than wait and get sicker, when your decision-making abilities begin to erode.
Check what heat relief options exist in your area. Many cities now have programs designed to protect people during extreme heat events, such as the Heat Relief Network in Phoenix, which offers everything from hydration sites to air-conditioned respite centers. Urban areas frequently offer free air-conditioned bus rides to cooling centers, too. But because some of these sites might be unavailable during a major power outage, check local government websites for information.
Before leaving your home, collect any medications and important documents you might need. Also bring any animals you have at home — as the Red Cross emphasizes, “If it’s not safe for you to stay behind then it’s not safe to leave pets behind either.”
If you believe you have the symptoms of heat exhaustion, seek medical attention immediately. But keep in mind, hospitals will likely be overwhelmed during a major power outage — it’s better to have a plan for dealing with the heat long before you ever get sick, rather than try to deal with illness after it’s already set in.
Read more about heat waves:
This Is How You Die of Extreme Heat
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The nonprofit laid off 36 employees, or 28% of its headcount.
The Trump administration’s funding freeze has hit the leading electrification nonprofit Rewiring America, which announced Thursday that it will be cutting its workforce by 28%, or 36 employees. In a letter to the team, the organization’s cofounder and CEO Ari Matusiak placed the blame squarely on the Trump administration’s attempts to claw back billions in funding allocated through the Greenhouse Gas Reduction Fund.
“The volatility we face is not something we created: it is being directed at us,” Matusiak wrote in his public letter to employees. Along with a group of four other housing, climate, and community organizations, collectively known as Power Forward Communities, Rewiring America was the recipient of a $2 billion GGRF grant last April to help decarbonize American homes.
Now, the future of that funding is being held up in court. GGRF funds have been frozen since mid-February as Lee Zeldin’s Environmental Protection Agency has tried to rescind $20 billion of the program’s $27 billion total funding, an effort that a federal judge blocked in March. While that judge, Tanya S. Chutkan, called the EPA’s actions “arbitrary and capricious,” for now the money remains locked up in a Citibank account. This has wreaked havoc on organizations such as Rewiring America, which structured projects and staffing decisions around the grants.
“Since February, we have been unable to access our competitively and lawfully awarded grant dollars,” Matusiak wrote in a LinkedIn post on Thursday. “We have been the subject of baseless and defamatory attacks. We are facing purposeful volatility designed to prevent us from fulfilling our obligations and from delivering lower energy costs and cheaper electricity to millions of American households across the country.”
Matusiak wrote that while “Rewiring America is not going anywhere,” the organization is planning to address said volatility by tightening its focus on working with states to lower electricity costs, building a digital marketplace for households to access electric upgrades, and courting investment from third parties such as hyperscale cloud service providers, utilities, and manufacturers. Matusiak also said Rewiring America will be restructured “into a tighter formation,” such that it can continue to operate even if the GGRF funding never comes through.
Power Forward Communities is also continuing to fight for its money in court. Right there with it are the Climate United Fund and the Coalition for Green Capital, which were awarded nearly $7 billion and $5 billion, respectively, through the GGRF.
What specific teams within Rewiring America are being hit by these layoffs isn’t yet clear, though presumably everyone let go has already been notified. As the announcement went live Thursday afternoon, it stated that employees “will receive an email within the next few minutes informing you of whether your role has been impacted.”
“These are volatile and challenging times,” Matusiak wrote on LinkedIn. “It remains on all of us to create a better world we can all share. More so than ever.”
A battle ostensibly over endangered shrimp in Kentucky
A national park is fighting a large-scale solar farm over potential impacts to an endangered shrimp – what appears to be the first real instance of a federal entity fighting a solar project under the Trump administration.
At issue is Geenex Solar’s 100-megawatt Wood Duck solar project in Barren County, Kentucky, which would be sited in the watershed of Mammoth Cave National Park. In a letter sent to Kentucky power regulators in April, park superintendent Barclay Trimble claimed the National Park Service is opposing the project because Geenex did not sufficiently answer questions about “irreversible harm” it could potentially pose to an endangered shrimp that lives in “cave streams fed by surface water from this solar project.”
Trimble wrote these frustrations boiled after “multiple attempts to have a dialogue” with Geenex “over the past several months” about whether battery storage would exist at the site, what sorts of batteries would be used, and to what extent leak prevention would be considered in development of the Wood Duck project.
“The NPS is choosing to speak out in opposition of this project and requesting the board to consider environmental protection of these endangered species when debating the merits of this project,” stated the letter. “We look forward to working with the Board to ensure clean water in our national park for the safety of protection of endangered species.”
On first blush, this letter looks like normal government environmental stewardship. It’s true the cave shrimp’s population decline is likely the result of pollution into these streams, according to NPS data. And it was written by career officials at the National Park Service, not political personnel.
But there’s a few things that are odd about this situation and there’s reason to believe this may be the start of a shift in federal policy direction towards a more critical view of solar energy’s environmental impacts.
First off, Geenex has told local media that batteries are not part of the project and that “several voicemails have been exchanged” between the company and representatives of the national park, a sign that the company and the park have not directly spoken on this matter. That’s nothing like the sort of communication breakdown described in the letter. Then there’s a few things about this letter that ring strange, including the fact Fish and Wildlife Service – not the Park Service – ordinarily weighs in on endangered species impacts, and there’s a contradiction in referencing the Endangered Species Act at a time when the Trump administration is trying to significantly pare back application of the statute in the name of a faster permitting process. All of this reminds me of the Trump administration’s attempts to supposedly protect endangered whales by stopping offshore wind projects.
I don’t know whether this solar farm’s construction will indeed impact wildlife in the surrounding area. Perhaps it may. But the letter strikes me as fascinating regardless, given the myriad other ways federal agencies – including the Park Service – are standing down from stringent environmental protection enforcement under Trump 2.0.
Notably, I reviewed the other public comments filed against the project and they cite a litany of other reasons – but also state that because the county itself has no local zoning ordinance, there’s no way for local residents or municipalities opposed to the project to really stop it. Heatmap Pro predicts that local residents would be particularly sensitive to projects taking up farmland and — you guessed it — harming wildlife.
Barren County is in the process of developing a restrictive ordinance in the wake of this project, but it won’t apply to Wood Duck. So opponents’ best shot at stopping this project – which will otherwise be online as soon as next year – might be relying on the Park Service to intervene.
And more on the week’s most important conflicts around renewable energy.
1. Dukes County, Massachusetts – The Supreme Court for the second time declined to take up a legal challenge to the Vineyard Wind offshore project, indicating that anti-wind activists' efforts to go directly to the high court have run aground.
2. Brooklyn/Staten Island, New York – The battery backlash in the NYC boroughs is getting louder – and stranger – by the day.
3. Baltimore County, Maryland – It’s Ben Carson vs. the farmer near Baltimore, as a solar project proposed on the former Housing and Urban Development secretary’s land is coming under fire from his neighbors.
4. Mecklenburg County, Virginia – Landowners in this part of Virginia have reportedly received fake “good neighbor agreement” letters claiming to be from solar developer Longroad Energy, offering large sums of cash to people neighboring the potential project.
5. York County, South Carolina – Silfab Solar is now in a bitter public brawl with researchers at the University of South Carolina after they released a report claiming that a proposed solar manufacturing plant poses a significant public risk in the event of a chemical emissions release.
6. Jefferson Davis County, Mississippi – Apex Clean Energy’s Bluestone Solar project was just approved by the Mississippi Public Service Commission with no objections against the project.
7. Plaquemine Parish, Louisiana – NextEra’s Coastal Prairie solar project got an earful from locals in this parish that sits within the Baton Rouge metro area, indicating little has changed since the project was first proposed two years ago.
8. Huntington County, Indiana – Well it turns out Heatmap’s Most At-Risk Projects of the Energy Transition has been right again: the Paddlefish solar project has now been indefinitely blocked by this county under a new moratorium on the project area in tandem with a new restrictive land use ordinance on solar development overall.
9. Albany County, Wyoming – The Rail Tie wind farm is back in the news again, as county regulators say landowners feel misled by Repsol, the project’s developer.
10. Klickitat County, Washington – Cypress Creek Renewables is on a lucky streak with a solar project near Goldendale, Washington, getting to bypass local opposition from the nearby Yakama Nation.
11. Pinal County, Arizona – A large utility-scale NextEra solar farm has been rejected by this county’s Board of Supervisors.