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As heat waves get worse, these fixes will help keep your home cool and energy efficient.
July 2023 will almost certainly be declared the hottest month ever recorded, but it is unlikely to hold that record for long. Climate change is making heat waves more frequent, intense, and longer-lasting across the U.S.
Adapting to this hotter future is often discussed at the scale of a city; measured in early warning systems, green spaces, and cooling centers. But there’s also a lot that individual homeowners can do to help their communities and protect themselves.
While the vast majority of American households — some 88% — use air conditioning for relief, homeowners would be wise to consider a variety of additional, “passive” cooling techniques. These are strategies that can keep your home at a safe temperature during a heat wave if the power goes out, an increasingly likely scenario. They will also save you a bit of money on energy bills. In a sense, adapting your home to extreme heat is just another way of thinking about how to make it more energy efficient.
These retrofits also have wider benefits. Since air conditioners work by transferring heat from inside your house outdoors, these fixes can cool down your neighborhood. They’ll cut carbon emissions and air pollution by lowering demand for electricity. If widely adopted, they’ll also help prevent blackouts and could shrink the amount of renewable energy projects that need to be built to replace fossil fuels, alleviating pressure on conservation.
I spoke with Steve Easley, a building science consultant who specializes in energy efficiency, and Shawn Maurer, technical director of the Smart Energy Design Assistance Center at the University of Illinois, about how homeowners should prioritize their options when it comes to passive cooling.
“I always recommend that people do a home energy audit from a certified HERS rater,” Easley told me, referring to the Home Energy Rating System, a nationally recognized system for inspecting and calculating a home’s energy performance. The auditor will tell you how leaky your house is, and how well your roof insulation, windows, and other parts of your house are working to keep out heat, and help you figure out what to attack first. (Easley also recommends getting at least three quotes for any of these solutions, because different contractors bid this work out very differently.)
Below are five things you can do to improve your home’s resilience to heat. Depending on a number of factors — such as where you live, how your house is constructed, and the condition it's in — the mileage you can get out of each of these measures will vary. The good news is that the federal government and many state governments offer tax credits and rebates for most of these solutions. The Inflation Reduction Act created the Energy Efficient Home Improvement tax credit, which offers homeowners up to $1,200 per year to spend on energy efficiency improvements. As part of that, you can claim $150 simply for getting an energy audit.
Maurer said the very first thing he would do to improve the efficiency of a home is to seal up any cracks where air can get in — for example, along the edges of the floors, around the windows, and in the ceiling around light fixtures. “That carries in moisture, heat, and everything from outdoors into the house. It's going to offset any air conditioned air you got inside the house. So air leakage is usually the place we recommend to start,” he said. “And then from there, it's what your budget can handle as far as adding more insulation to your house.”
Insulation comes in a wide range of materials, such as fiberglass and rock wool, blown cellulose, and rigid foam boards. It can be blown into your walls, installed on the floor of the attic, or underneath your roof deck. It’s a jack-of-all-trades when it comes to energy efficiency, since it keeps heat inside in the winter and blocks it from entering in the summer. That means it’s a great option for those in colder climates that also want to prepare their homes for hotter summers.
A 2021 study by a group of researchers at Lawrence Berkeley National Lab modeled the efficacy of a wide array of passive cooling measures in low-income homes in Fresno, California. It found that roof insulation, along with solar-control window films, which we’ll get to in a moment, were the two most effective ways to keep heat from entering the buildings. However, the authors note that roof insulation is an expensive major retrofit, and recommend that it only be done when the roof needs replacement.
A good first step might be finding out what kind of insulation you already have. The most important metric when it comes to insulation is called “R-value,” and the higher the number, the more effective it is. Older homes may have attic insulation as low as R-13, whereas modern building codes typically require insulation between R-38 and R-60.
The new federal tax credit offers up to 30% of the total cost of a project for air sealing and insulation, maxing out at $1,200 total. (Labor costs are not covered by the credit.)
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Having a light-colored roof and exterior will most certainly keep your home cooler than darker options, but not all light colors are created equal. “Cool” roofs and walls are made with special materials that reflect solar energy back into space, preventing it from being absorbed by the building. They also have high “thermal emittance,” meaning they release a lot of the heat that they do absorb, rather than sending it indoors.
All kinds of materials have been developed with these properties. For roofs, there are tiles, shingles, membranes, liquid coatings, and products made of slate, wood, and metal.
Cool roofs don’t necessarily have to be white, although the color does work very well. According to a database maintained by the Cool Roof Ratings Council, the most effective products tend to be bright white coatings, but there are also gray, green, blue, brown, and tan products that are rated highly.
For reflective walls, the most effective products similarly come in white and other light-colored paints, which can reflect 60 to 90 percent of sunlight when new. An extensive 2019 study of reflective wall paints by the same group at Lawrence Berkeley National Lab found that cool walls can reduce annual energy use in single-family homes in warmer U.S. climates by 2% to 8.5%.
Easley said it’s worth considering a cool roof if you have a central air conditioning system in your attic. Otherwise, attics in places like Arizona can get upwards of 130 degrees, taxing the equipment and forcing it to work harder. If your attic isn’t home to your AC, it may only make financial sense to do this kind of retrofit if your house is already in need of a new paint job or your roof needs work.
But it’s probably not worth considering a cool roof if you live in a colder climate, like the Northeast and upper Midwest, since cool roofs can actually make it colder inside in the winter.
There’s no federal incentives for cool roofs, but several states and utilities offer rebates.
This is a big category, and it’s easy to get overwhelmed by the options. Starting with those that will likely cost the most to the least, you can:
• Replace your windows altogether.
• Add storm windows to the interior or exterior of your existing glass.
• Purchase films that can be applied to the existing glass to increase its reflectivity.
• Install external shutters or awnings that block the sun.
• Install interior blinds and curtains that block the sun.
Here’s a rundown of each option.
New windows: Replacing your windows can cost tens of thousands of dollars, so unless they are already in need of repair, you may want to hold off on that option. But when the day does come around, you’ll want to look for “Low-E” windows, which stands for low emissivity. The inside of the glass is coated with microscopic layers of silver that reflect heat while still allowing light to pass through.
Within that category, you’ll also want to look for windows that have what’s called a low “solar heat gain coefficient.” This measures how much heat is absorbed by the glass and transferred inside. It’s rated on a scale of 0 to 1. If you live somewhere that’s sunny year round like Arizona, you ideally want one rated 0.25 or lower.
Through 2032, homeowners can claim up to $600 in federal tax credits for purchasing Energy Star rated windows.
Storm windows: Rather than replacing your windows entirely, it’s far cheaper to install storm windows with Low-E glass, which basically involves bolting another window to the outside of your house. Storm windows have an added benefit of improving air sealing, eliminating drafts.
Film: An even lower-cost option is to look into films with low solar heat gain coefficients that can be applied to existing windows. However, Easeley warned that many manufacturers will void your warranty if you add films to your windows.
Shutters, awnings, blinds, and curtains: Exterior shutters and overhangs that block the sun from ever reaching your windows will generally be more effective than interior shades or blinds, but all of these measures can help. “Window blinds and curtains are really dirt cheap ways to control energy,” said Maurer. “It’s not a very good buffer, but it’s something.”
The Berkeley study on passive cooling measures notes that blinds moderately improve how much heat from the sun enters your home, but they can feel more effective by reducing the sensation of sunlight streaming into your house.
If you still have any incandescent lights, they can also be a significant source of heat. They should be replaced with LED lights.
Planting trees, climbing ivy, and other vegetation can also passively cool your house by shading both your house and any surrounding pavement. However, if you have solar panels, or plan to get them in the future, do not plant trees on the south side of your home as it may reduce the solar system’s effectiveness.
Maurer cautioned that if you do a bunch of work in your home to reduce your cooling needs, you’ll want to keep that in mind if you ever have to replace your air conditioner. He advised having a contractor come in to re-measure what size system you need, since doing a like-for-like replacement will probably be overkill and could result in it malfunctioning.
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It would have delivered a gargantuan 6.2 gigawatts of power.
The Bureau of Land Management says the largest solar project in Nevada has been canceled amidst the Trump administration’s federal permitting freeze.
Esmeralda 7 was supposed to produce a gargantuan 6.2 gigawatts of power – equal to nearly all the power supplied to southern Nevada by the state’s primary public utility. It would do so with a sprawling web of solar panels and batteries across the western Nevada desert. Backed by NextEra Energy, Invenergy, ConnectGen and other renewables developers, the project was moving forward at a relatively smooth pace under the Biden administration, albeit with significant concerns raised by environmentalists about its impacts on wildlife and fauna. And Esmeralda 7 even received a rare procedural win in the early days of the Trump administration when the Bureau of Land Management released the draft environmental impact statement for the project.
When Esmeralda 7’s environmental review was released, BLM said the record of decision would arrive in July. But that never happened. Instead, Donald Trump issued an executive order as part of a deal with conservative hardliners in Congress to pass his tax megabill, which also effectively repealed the Inflation Reduction Act’s renewable electricity tax credits. This led to subsequent actions by Interior Secretary Doug Burgum to freeze all federal permitting decisions for solar energy.
Flash forward to today, when BLM quietly updated its website for Esmeralda 7 permitting to explicitly say the project’s status is “cancelled.” Normally when the agency says this, it means developers pulled the plug.
I’ve reached out to some of the companies behind Esmeralda 7 but was unable to reach them in time for publication. If I hear from them confirming the project is canceled – or that BLM is wrong in some way – I will let you know.
It’s not perfect, but pretty soon, it’ll be available for under $30,000.
Here’s what you need to know about the rejuvenated Chevrolet Bolt: It’s back, it’s better, and it starts at under $30,000.
Although the revived 2027 Bolt doesn’t officially hit the market until January 2026, GM revealed the new version of the iconic affordable EV at a Wednesday evening event at the Universal Studios backlot in Los Angeles. The assembled Bolt owners and media members drove the new cars past Amity Island from Jaws and around the Old West and New York sets that have served as the backdrops of so many television shows and movies. It was star treatment for a car that, like its predecessor, isn’t the fanciest EV around. But given the giveaway patches that read “Chevy Bolt: Back by popular demand,” it’s clear that GM heard the cries of people who missed having the plucky electric hatchback on the market.
The Bolt died at the height of its powers. The original Bolt EV and Bolt EUV sold in big numbers in the late 2010s and early 2020s, powered by a surprisingly affordable price compared to competitor EVs and an interior that didn’t feel cramped despite its size as a smallish hatchback. In 2023, the year Chevy stopped selling it, the Bolt was the third-best-selling EV in America after Tesla’s top two models.
Yet the original had a few major deficiencies that reflected the previous era of EVs. The most egregious of which was its charging speed that topped out at around 50 kilowatts. Given that today’s high-speed chargers can reach 250 to 350 kilowatts — and an even faster future could be on the way — the Bolt’s pit stops on a road trip were a slog that didn’t live up to its peppy name.
Thankfully, Chevy fixed it. Charging speed now reaches 150 kilowatts. While that figure isn’t anywhere near the 350 kilowatts that’s possible in something like the Hyundai Ioniq 9, it’s a threefold improvement for the Bolt that lets it go from 10% to 80% charged in a respectable 26 minutes. The engineers said they drove a quartet of the new cars down old Route 66 from the Kansas City area, where the Bolt is made, to Los Angeles to demonstrate that the EV was finally ready for such an adventure.
From the outside, the 2027 Bolt is virtually indistinguishable from the old car, but what’s inside is a welcome leap forward. New Bolt has a lithium-ion-phosphate, or LFP battery that holds 65 kilowatt-hours of energy, but still delivers 255 miles of max range because of the EV’s relatively light weight. Whereas older EVs encourage drivers to stop refueling at around 80%, the LFP battery can be charged to 100% regularly without the worry of long-term damage to the battery.
The Bolt is GM’s first EV with the NACS charging standard, the former Tesla proprietary plug, which would allow the little Chevy to visit Tesla Superchargers without an adapter (though its port placement on the front of the driver’s side is backwards from the way older Supercharger stations are built). Now built on GM’s Ultium platform, the Bolt shares its 210-horsepower electric motor with the Chevy Equinox EV and gets vehicle-to-load capability, meaning you’ll be able to tap into its battery energy for other uses such as powering your home.
But it’s the price that’s the real wow factor. Bolt will launch with an RS version that gets the fancier visual accents and starts at $32,000. The Bolt LT that will be available a little later will eventually start as low as $28,995, a figure that includes the destination charge that’s typically slapped on top of a car’s price, to the tune of an extra $1,000 to $2,000 on delivery. Perhaps it’s no surprise that GM revealed this car just a week after the end of the $7,500 federal tax credit for EV purchases (and just a day after Tesla announced its budget versions of the Model Y and Model 3). Bringing in a pretty decent EV at under $30,000 without the help of a big tax break is a pretty big deal.
The car is not without compromises. Plenty of Bolt fans are aghast that Chevy abandoned the Apple CarPlay and Android Auto integrations that worked with the first Bolt in favor of GM’s own built-in infotainment system as the only option. Although the new Bolt was based on the longer, “EUV” version of the original, this is still a pretty compact car without a ton of storage space behind the back seats. Still, for those who truly need a bigger vehicle, there’s the Chevy Equinox EV.
For as much time as I’ve spent clamoring for truly affordable EVs that could compete with entry-level gas cars on prices, the Bolt’s faults are minor. At $29,000 for an electric vehicle in the U.S., there is practically zero competition until the new Nissan Leaf arrives. The biggest threats to the Bolt are America’s aversion to small cars and the rapid rates of depreciation that could allow someone to buy a much larger, gently used EV for the price of the new Chevy. But the original Bolt found a steady footing among drivers who wanted that somewhat counter-cultural car — and this one is a lot better.
“Old economy” companies like Caterpillar and Williams are cashing in by selling smaller, less-efficient turbines to impatient developers.
From the perspective of the stock market, you’re either in the AI business or you’re not. If you build the large language models pushing out the frontiers of artificial intelligence, investors love it. If you rent out the chips the large language models train on, investors love it. If you supply the servers that go in the data centers that power the large language models, investors love it. And, of course, if you design the chips themselves, investors love it.
But companies far from the software and semiconductor industry are profiting from this boom as well. One example that’s caught the market’s fancy is Caterpillar, better known for its scale-defying mining and construction equipment, which has become a “secular winner” in the AI boom, writes Bloomberg’s Joe Weisenthal.
Typically construction businesses do well when the overall economy is doing well — that is, they don’t typically take off with a major technological shift like AI. Now, however, Caterpillar has joined the ranks of the “picks and shovels” businesses capitalizing on the AI boom thanks to its gas turbine business, which is helping power OpenAI’s Stargate data center project in Abilene, Texas.
Just one link up the chain is another classic “old economy” business: Williams Companies, the natural gas infrastructure company that controls or has an interest in over 33,000 miles of pipeline and has been around in some form or another since the early 20th century.
Gas pipeline companies are not supposed to be particularly exciting, either. They build large-scale infrastructure. Their ratemaking is overseen by federal regulators. They pay dividends. The last gas pipeline company that got really into digital technology, well, uh, it was Enron.
But Williams’ shares are up around 28% in the past year — more than Caterpillar. That’s in part, due to its investing billions in powering data centers with behind the meter natural gas.
Last week, Williams announced that it would funnel over $3 billion into two data center projects, bringing its total investments in powering AI to $5 billion. This latest bet, the company said, is “to continue to deliver speed-to-market solutions in grid-constrained markets.”
If we stipulate that the turbines made by Caterpillar are powering the AI boom in a way analogous to the chips designed by Nvidia or AMD and fabricated by TSMC, then Williams, by developing behind the meter gas-fired power plants, is something more like a cloud computing provider or data center developer like CoreWeave, except that its facilities house gas turbines, not semiconductors.
The company has “seen the rapid emergence of the need for speed with respect to energy,” Williams Chief Executive Chad Zamarin said on an August earnings call.
And while Williams is not a traditional power plant developer or utility, it knows its way around natural gas. “We understand pipeline capacity,” Zamarin said on a May earnings call. “We obviously build a lot of pipeline and turbine facilities. And so, bringing all the different pieces together into a solution that is ready-made for a customer, I think, has been truly a differentiator.”
Williams is already behind the Socrates project for Meta in Ohio, described in a securities filing as a $1.6 billion project that will provide 400 megawatts of gas-fired power. That project has been “upsized” to $2 billion and 750 megawatts, according to Morgan Stanley analysts.
Meta CEO Mark Zuckerberg has said that “energy constraints” are a more pressing issue for artificial intelligence development than whether the marginal dollar invested is worth it. In other words, Zuckerberg expects to run out of energy before he runs out of projects that are worth pursuing.
That’s great news for anyone in the business of providing power to data centers quickly. The fact that developers seem to have found their answer in the Williamses and Caterpillars of the world, however, calls into question a key pillar of the renewable industry’s case for itself in a time of energy scarcity — that the fastest and cheapest way to get power for data centers is a mix of solar and batteries.
Just about every renewable developer or clean energy expert I’ve spoken to in the past year has pointed to renewables’ fast timeline and low cost to deploy compared to building new gas-fired, grid-scale generation as a reason why utilities and data centers should prefer them, even absent any concerns around greenhouse gas emissions.
“Renewables and battery storage are the lowest-cost form of power generation and capacity,” Next Era chief executive John Ketchum said on an April earnings call. “We can build these projects and get new electrons on the grid in 12 to 18 months.” Ketchum also said that the price of a gas-fired power plant had tripled, meanwhile lead times for turbines are stretching to the early 2030s.
The gas turbine shortage, however, is most severe for large turbines that are built into combined cycle systems for new power plants that serve the grid.
GE Vernova is discussing delivering turbines in 2029 and 2030. While one manufacturer of gas turbines, Mitsubishi Heavy Industries, has announced that it plans to expand its capacity, the industry overall remains capacity constrained.
But according to Morgan Stanley, Williams can set up behind the meter power plants in 18 months. xAI’s Colossus data center in Memphis, which was initially powered by on-site gas turbines, went from signing a lease to training a large language model in about six months.
These behind the meter plants often rely on cheaper, smaller, simple cycle turbines, which generate electricity just from the burning of natural gas, compared to combined cycle systems, which use the waste heat from the gas turbines to run steam turbines and generate more energy. The GE Vernova 7HA combined cycle turbines that utility Duke Energy buys, for instance, range in output from 290 to 430 megawatts. The simple cycle turbines being placed in Ohio for the Meta data center range in output from about 14 megawatts to 23 megawatts.
Simple cycle turbines also tend to be less efficient than the large combined cycle system used for grid-scale natural gas, according to energy analysts at BloombergNEF. The BNEF analysts put the emissions difference at almost 1,400 pounds of carbon per megawatt-hour for the single turbines, compared to just over 800 pounds for combined cycle.
Overall, Williams is under contract to install 6 gigawatts of behind-the-meter power, to be completed by the first half of 2027, Morgan Stanley analysts write. By comparison, a joint venture between GE Vernova, the independent power producer NRG, and the construction company Kiewit to develop combined cycle gas-fired power plants has a timeline that could stretch into 2032.
The Williams projects will pencil out on their own, the company says, but they have an obvious auxiliary benefit: more demand for natural gas.
Williams’ former chief executive, Alan Armstrong, told investors in a May earnings call that he was “encouraged” by the “indirect business we are seeing on our gas transmission systems,” i.e. how increased natural gas consumption benefits the company’s traditional pipeline business.
Wall Street has duly rewarded Williams for its aggressive moves.
Morgan Stanley analysts boosted their price target for the stock from $70 to $83 after last week’s $3 billion announcement, saying in a note to clients that the company has “shifted from an underappreciated value (impaired terminal value of existing assets) to underappreciated growth (accelerating project pipeline) story.” Mizuho Securities also boosted its price target from $67 to $72, with analyst Gabriel Moreen telling clients that Williams “continues to raise the bar on the scope and potential benefits.”
But at the same time, Moreen notes, “the announcement also likely enhances some investor skepticism around WMB pushing further into direct power generation and, to a lesser extent, prioritizing growth (and growth capex) at the expense of near-term free cash flow and balance sheet.”
In other words, the pipeline business is just like everyone else — torn between prudence in a time of vertiginous economic shifts and wanting to go all-in on the AI boom.
Williams seems to have decided on the latter. “We will be a big beneficiary of the fast rising data center power load,” Armstrong said.