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Money is pouring in — and deadlines are approaching fast.
There’s no quick fix for decarbonizing medium- and long-distance flights. Batteries are typically too heavy, and hydrogen fuel takes up too much space to offer a practical solution, leaving sustainable aviation fuels made from plants and other biomass, recycled carbon, or captured carbon as the primary options. Traditionally, this fuel is much more expensive — and the feedstocks for it much more scarce — than conventional petroleum-based jet fuel. But companies are now racing to overcome these barriers, as recent months have seen backers throw hundreds of millions behind a series of emergent, but promising solutions.
Today, most SAF is made of feedstocks such as used cooking oil and animal fats, from companies such as Neste and Montana Renewables. But this supply is limited by, well, the amount of cooking oil or fats restaurants and food processing facilities generate, and is thus projected to meet only about 10% of total SAF demand by 2050, according to a 2022 report by the Mission Possible Partnership. Beyond that, companies would have to start growing new crops just to make into fuel.
That creates an opportunity for developers of second-generation SAF technologies, which involve making jet fuel out of captured carbon or alternate biomass sources, such as forest waste. These methods are not yet mature enough to make a significant dent in 2030 targets, such as the EU's mandate to use 6% SAF and the U.S. government’s goal of producing 3 billion gallons of SAF per year domestically. But this tech will need to be a big part of the equation in order to meet the aviation sector’s overall goal of net zero emissions by 2050, as well as the EU’s sustainable fuels mandate, which increases to 20% by 2035 and 70% by 2050 for all flights originating in the bloc.
“That’s going to be a massive jump because currently, SAF uptake is about 0.2% of fuel,” Nicole Cerulli, a research associate for transportation and logistics at the market research firm Cleantech Group, told me. The head of the airline industry’s trade association, Willie Walsh, said in December at a media day event, "We’re not making as much progress as we’d hoped for, and we’re certainly not making as much progress as we need.” While global SAF production doubled to 1 million metric tons in 2024, that fell far below the trade group’s projection of 1.5 million metric tons, made at the end of 2023.
Producing SAF requires making hydrocarbons that mirror those used in traditional jet fuel. We know how to do that, but the processes required — electrolysis, gasification, and the series of chemical reactions known as Fischer-Tropsch synthesis — are energy intensive. So finding a way to power all of this sustainably while simultaneously scaling to meet demand is a challenging and expensive task.
Aamir Shams, a senior associate at the energy think tank RMI whose work focuses on driving demand for SAF, told me that while sustainable fuel is undeniably more expensive than traditional fuel, airlines and corporations have so far been willing to pay the premium. “We feel that the lag is happening because we just don’t have the fuel today,” Shams said. “Whatever fuel shows up, it just flies off the shelves.”
Twelve, a Washington-based SAF producer, thinks its e-fuels can help make a dent. The company is looking to produce jet fuel initially by recycling the CO2 emitted from the ethanol, pulp, and paper industries. In September, the company raised $645 million to complete the buildout of its inaugural SAF facility in Washington state, support the development of future plants, and pursue further R&D. The funding includes $400 million in project equity from the impact fund TPG Rise Climate, $200 million in Series C financing led by TPG, Capricorn Investment Group, and Pulse Fund, and $45 million in loans. The company has also previously partnered with the Air Force to explore producing fuel on demand in hard to reach areas.
Nicholas Flanders, Twelve’s CEO, told me that the company is starting with ethanol, pulp, and paper because the CO2 emissions from these facilities are relatively concentrated and thus cheaper to capture. And unlike, say, coal power plants, these industries aren’t going anywhere fast, making them a steady source of carbon. To turn the captured CO2 into sustainable fuel, the company needs just one more input — water. Renewable-powered electrolyzers then break apart the CO2 and H2O into their constituent parts, and the resulting carbon monoxide and hydrogen are combined to create a syngas. That then gets put through a chemical reaction known as “Fischer-Tropsch synthesis,” where the syngas reacts with catalysts to form hydrocarbons, which are then processed into sustainable jet fuel and ultimately blended with conventional fuel.
Twelve says its proprietary CO2 electrolyzer can break apart CO2 at much lower temperatures than would typically be required for this molecule, which simplifies the whole process, making it easier to ramp the electrolyzers up and down to match the output of intermittent renewables. (How does it do this? The company didn’t respond when I asked.) Twelve’s first plant, which sources carbon from a nearby ethanol facility, is set to come online next year, producing 50,000 gallons of SAF annually once it’s fully scaled, with electrolyzers that will run on hydropower.
While Europe may have stricter, actually enforceable SAF requirements than the U.S., Flanders told me there’s a lot of promise in domestic production. “I think the U.S. has an exciting combination of relatively low-cost green electricity, lots of biogenic CO2 sources, a lot of demand for the product we’re making, and then the inflation Reduction Act and state level incentives can further enhance the economics.” Currently, the IRA provides SAF producers with a baseline $1.25 tax credit per gallon produced, which gradually increases the greener the fuel gets. Of course, whether or not the next Congress will rescind this is anybody’s guess.
Down the line, incentives and mandates will end up mattering a whole lot. Making SAF simply costs a whole lot more than producing jet fuel the standard way, by refining crude oil. But in the meantime, Twelve is setting up cost-sharing partnerships between airlines that want to reduce their direct emissions (scope 1) and large corporations that want to reduce their indirect emissions (scope 3), which include employee business travel.
For example, Twelve has offtake agreements with Seattle-based Alaska Airlines and Microsoft for the fuel produced at its initial Washington plant. Microsoft, which aims to reduce emissions from its employees’ flights, will essentially cover the cost premium associated with Twelve’s more expensive SAF fuel, making it cost-effective for Alaska to use in its fleet. Twelve has a similar agreement with Boston Consulting Group and an unnamed airline
Eventually, Flanders told me, the company expects to source carbon via direct air capture, but doing so today would be prohibitively expensive. “If there were a customer who wanted to pay the additional amount to use DAC today, we'd be very happy to do that,” Flanders said. “But our perspective is it will maybe be another decade before that cost starts to converge.”
No sustainable fuel is even close to cost parity yet — Cerulli told me that it generally comes with a “roughly 250% to over 800%” cost premium over conventional jet fuel. So while voluntary uptake by companies such as Microsoft and BCG are helping drive the emergent market today, that won’t be near enough to decarbonize the industry. “At the simplest level, the cost of not using SAF has to be higher than using it,” Cerulli told me.
Pathway Energy thinks that by incorporating carbon sequestration into its process, it can help the world get there. The sustainable fuels company, which emerged from stealth just last month, is pursuing what CEO Steve Roberts told me is “probably the most cost-efficient long-term pathway from a decarbonization perspective.” The company is building a $2 billion SAF plant in Port Arthur, Texas designed to produce about 30 million gallons of jet fuel annually — enough to power about 5,000 carbon-neutral 10-hour flights — while also permanently sequestering more than 1.9 million tons of CO2.
Pathway, a subsidiary of the investment and advisory firm Nexus Holdings, has partnered with the UK-based renewable energy company Drax, which will supply the company with 1 million metric tons of wood pellets, to be turned into fuel using a series of well-established technologies. The first step is to gasify the biomass by heating the pellets to high temperatures in the absence of oxygen to produce a syngas. Then, just as Twelve does, it puts the syngas through the Fischer-Tropsch process to form the hydrocarbons that become SAF.
The competitive advantage here is capturing the emissions from the fuel production process itself and storing them permanently underground. Since Pathway is burying CO2 that’s already been captured by the trees from which the wood pellets come, that would make Pathway’s SAF carbon-negative, in theory, while the best Twelve and similar companies can hope for is carbon neutrality, assuming all of their captured carbon is used to produce fuel.
The choice of Drax as a feedstock partner is not without controversy, however, as the BBC revealed that the company sources much of its wood from rare old-growth forests. Though this is technically legal, it’s also ecologically disruptive. Roberts told me Drax’s sourcing methodologies have been verified by third parties, and Pathway isn’t concerned. “I don't think any of that controversy has yielded any actually significant changes to their sourcing program at all, because we believe that they're compliant,” Roberts told me. “We are 100% certain that they’re meeting all the standards and expectations.”
Pathway has big growth plans, which depend on the legitimacy of its sustainability cred. Beyond the Port Arthur facility, which Roberts told me will begin production by the end of 2029 or early 2030, the company has a pipeline of additional facilities along the Gulf Coast in the works. It also has global ambitions. “When you have a fuel that is this negative, it really opens up a global market, because you can transport fuel out of Texas, whether that be into the EU, Africa, Asia, wherever it may be,” Roberts said, explaining that even substantial transportation-related emissions would be offset by the carbon-negativity of the fuel.
But alternative feedstocks such as forestry biomass are finite resources, too. That’s why many experts think that within the SAF sector, e-fuels such as Twelve’s that could one day source carbon via direct air capture and then electrolyze it have the greatest potential for growth. “It’s extremely dependent on getting sustainable CO2 and cheap electricity prices so that you can make cheap green hydrogen,” Shams told me. “But theoretically, it is unlimited in terms of what your total cap on production would be.”
In the meantime, airlines are focused on making their planes and engines more aerodynamic and efficient so that they don’t consume as much fuel in the first place. They’re also exploring other technical pathways to decarbonization — because after all, SAF will only be a portion of the solution, as many short and medium-length flights could likely be powered by batteries or hydrogen fuel. RMI forecasts that by 2050, 45% of global emissions reduction in the aviation sector will come from improvements in fuel efficiency, 37% will be due to SAF deployment, 7% will come from hydrogen, and 3.5% will come from electrification.
If you did the mental math, you’ll notice these numbers add up to 92.5% — not 100%. “What we have done is, let's look at what we are actually doing today and for the past three, four, five years, and let's see if we get to net zero or not. And the answer is, no. We don't get to net zero by 2050,” Shams told me. And while getting to 92.5% is nothing to scoff at, that means that the aviation sector would still be emitting about 700 million metric tons of CO2 equivalent by that time.
So what’s to be done? “The financing sector needs to step up its game and take a little bit more of a risk than they are used to,” Shams told me, noting that one of RMI’s partners, the Mission Possible Partnership, estimates that getting the aviation sector to net zero will require an investment of around $170 billion per year, a total of about $4.5 trillion by 2050. These numbers take a variety of factors into account beyond strictly SAF production, such as airport infrastructure for new fuels, building out direct air capture plants, etc.
But any way you cut it, it’s a boatload of money that certainly puts Pathway’s $2 billion SAF facility and Twelve’s $645 million funding round in perspective. And it’s far from certain that we can get there. “Increasingly, that goal of the 2050 net-zero target looks really difficult to achieve,” Shams put it simply. “Commitments are always going up, but more can be done.”
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Any household savings will barely make a dent in the added costs from Trump’s many tariffs.
Donald Trump’s tariffs — the “fentanyl” levies on Canada, China, and Mexico, the “reciprocal” tariffs on nearly every country (and some uninhabited islands), and the global 10% tariff — will almost certainly cause consumer goods on average to get more expensive. The Yale Budget Lab estimates that in combination, the tariffs Trump has announced so far in his second term will cause prices to rise 2.3%, reducing purchasing power by $3,800 per year per household.
But there’s one very important consumer good that seems due to decline in price.
Trump administration officials — including the president himself — have touted cheaper oil to suggest that the economic response to the tariffs hasn’t been all bad. On Sunday, Secretary of the Treasury Scott Bessent told NBC, “Oil prices went down almost 15% in two days, which impacts working Americans much more than the stock market does.”
Trump picked up this line on Truth Social Monday morning. “Oil prices are down, interest rates are down (the slow moving Fed should cut rates!), food prices are down, there is NO INFLATION,” he wrote. He then spent the day posting quotes from Fox Business commentators echoing that idea, first Maria Bartiromo (“Rates are plummeting, oil prices are plummeting, deregulation is happening. President Trump is not going to bend”) then Charles Payne (“What we’re not talking about is, oil was $76, now it’s $65. Gasoline prices are going to plummet”).
But according to Neil Dutta, head of economic research at Renaissance Macro Research, pointing to falling oil prices as a stimulus is just another example of the “4D chess” theory, under which some market participants attribute motives to Trump’s trade policy beyond his stated goal of reducing trade deficits to as near zero (or surplus!) as possible.
Instead, oil markets are primarily “responding to the recession risk that comes from the tariff and the trade war,” Dutta told me. “That is the main story.” In short, oil markets see less global trade and less global production, and therefore falling demand for oil. The effect on household consumption, he said, was a “second order effect.”
It is true that falling oil prices will help “stabilize consumption,” Dutta told me (although they could also devastate America’s own oil industry). “It helps. It’ll provide some lift to real income growth for consumers, because they’re not spending as much on gasoline.” But “to fully offset the trade war effects, you basically need to get oil down to zero.”
That’s confirmed by some simple and extremely back of the envelope math. In 2023, households on average consumed about 700 gallons of gasoline per year, based on Energy Information Administration calculations that the average gasoline price in 2023 was $3.52, while the Bureau of Labor Statistics put average household gasoline expenditures at about $2,450.
Let’s generously assume that due to the tariffs and Trump’s regulatory and diplomatic efforts, gas prices drop from the $3.26 they were at on Monday, according to AAA, to $2.60, the average price in 2019. (GasBuddy petroleum analyst Patrick De Haanwrote Monday that the tariffs combined with OPEC+ production hikes could lead gas prices “to fall below $3 per gallon.”)
Let’s also assume that this drop in gas prices does not cause people to drive more or buy less fuel-efficient vehicles. In that case, those same 700 gallons cost the average American $1,820, which would generate annual savings of $630 on average per household. If we went to the lowest price since the Russian invasion of Ukraine, about $3 per gallon, total consumption of 700 gallons would cost a household about $2,100, saving $350 per household per year.
That being said, $1,820 is a pretty low level for annual gasoline consumption. In 2021, as the economy was recovering from the Covid recession and before gas prices popped, annual gasoline expenditures only got as low as $1,948; in 2020 — when oil prices dropped to literally negative dollars per barrel and gas prices got down to $1.85 a gallon — annual expenditures were just over $1,500.
In any case, if you remember the opening paragraphs of this story, even the most generous estimated savings would go nowhere near surmounting the overall rise in prices forecast by the Yale Budget Lab. $630 is less than $3,800! (JPMorgan has forecast a more mild increase in prices of 1% to 1.5%, but agrees that prices will likely rise and purchasing power will decline.)
But maybe look at it this way: You might be able to drive a little more than you expected to, even as your costs elsewhere are going up. Just please be careful! You don’t want to get into a bad accident and have to replace your car: New car prices are expected to rise by several thousand dollars due to Trump’s tariffs.
With cars about to get more expensive, it might be time to start tinkering.
More than a decade ago, when I was a young editor at Popular Mechanics, we got a Nissan Leaf. It was a big deal. The magazine had always kept long-term test cars to give readers a full report of how they drove over weeks and months. A true test of the first true production electric vehicle from a major car company felt like a watershed moment: The future was finally beginning. They even installed a destination charger in the basement of the Hearst Corporation’s Manhattan skyscraper.
That Leaf was a bit of a lump, aesthetically and mechanically. It looked like a potato, got about 100 miles of range, and delivered only 110 horsepower or so via its electric motors. This made the O.G. Leaf a scapegoat for Top Gear-style car enthusiasts eager to slander EVs as low-testosterone automobiles of the meek, forced upon an unwilling population of drivers. Once the rise of Tesla in the 2010s had smashed that paradigm and led lots of people to see electric vehicles as sexy and powerful, the original Leaf faded from the public imagination, a relic of the earliest days of the new EV revolution.
Yet lots of those cars are still around. I see a few prowling my workplace parking garage or roaming the streets of Los Angeles. With the faded performance of their old batteries, these long-running EVs aren’t good for much but short-distance city driving. Ignore the outdated battery pack for a second, though, and what surrounds that unit is a perfectly serviceable EV.
That’s exactly what a new brand of EV restorers see. Last week, car site The Autopiancovered DIYers who are scooping up cheap old Leafs, some costing as little as $3,000, and swapping in affordable Chinese-made 62 kilowatt-hour battery units in place of the original 24 kilowatt-hour units to instantly boost the car’s range to about 250 miles. One restorer bought a new battery on the Chinese site Alibaba for $6,000 ($4,500, plus $1,500 to ship that beast across the sea).
The possibility of the (relatively) simple battery swap is a longtime EV owner’s daydream. In the earlier days of the electrification race, many manufacturers and drivers saw simple and quick battery exchange as the solution for EV road-tripping. Instead of waiting half an hour for a battery to recharge, you’d swap your depleted unit for a fully charged one and be on your way. Even Tesla tested this approach last decade before settling for good on the Supercharger network of fast-charging stations.
There are still companies experimenting with battery swaps, but this technology lost. Other EV startups and legacy car companies that followed Nissan and Tesla into making production EVs embraced the rechargeable lithium-ion battery that is meant to be refilled at a fast-charging station and is not designed to be easily removed from the vehicle. Buy an electric vehicle and you’re buying a big battery with a long warranty but no clear plan for replacement. The companies imagine their EVs as something like a smartphone: It’s far from impossible to replace the battery and give the car a new life, but most people won’t bother and will simply move on to a new car when they can’t take the limitations of their old one anymore.
I think about this impasse a lot. My 2019 Tesla Model 3 began its life with a nominal 240 miles of range. Now that the vehicle has nearly six years and 70,000 miles on it, its maximum range is down to just 200, while its functional range at highway speed is much less than that. I don’t want to sink money into another vehicle, which means living with an EV’s range that diminishes as the years go by.
But what if, one day, I replaced its battery? Even if it costs thousands of dollars to achieve, a big range boost via a new battery would make an older EV feel new again, and at a cost that’s still far less than financing a whole new car. The thought is even more compelling in the age of Trump-imposed tariffs that will raise already-expensive new vehicles to a place that’s simply out of reach for many people (though new battery units will be heavily tariffed, too).
This is no simple weekend task. Car enthusiasts have been swapping parts and modifying gas-burning vehicles since the dawn of the automotive age, but modern EVs aren’t exactly made with the garage mechanic in mind. Because so few EVs are on the road, there is a dearth of qualified mechanics and not a huge population of people with the savvy to conduct major surgery on an electric car without electrocuting themselves. A battery-replacing owner would need to acquire not only the correct pack but also potentially adapters and other equipment necessary to make the new battery play nice with the older car. Some Nissan Leaf modifiers are finding their replacement packs aren’t exactly the same size, shape or weight, The Autopian says, meaning they need things like spacers to make the battery sit in just the right place.
A new battery isn’t a fix-all either. The motors and other electrical components wear down and will need to be replaced eventually, too. A man in Norway who drove his Tesla more than a million miles has replaced at least four battery packs and 14 motors, turning his EV into a sort of car of Theseus.
Crucially, though, EVs are much simpler, mechanically, than combustion-powered cars, what with the latter’s belts and spark plugs and thousands of moving parts. The car that surrounds a depleted battery pack might be in perfectly good shape to keep on running for thousands of miles to come if the owner were to install a new unit, one that could potentially give the EV more driving range than it had when it was new.
The battery swap is still the domain of serious top-tier DIYers, and not for the mildly interested or faint of heart. But it is a sign of things to come. A market for very affordable used Teslas is booming as owners ditch their cars at any cost to distance themselves from Elon Musk. Old Leafs, Chevy Bolts and other EVs from the 2010s can be had for cheap. The generation of early vehicles that came with an unacceptably low 100 to 150 miles of range would look a lot more enticing if you imagine today’s battery packs swapped into them. The possibility of a like-new old EV will look more and more promising, especially as millions of Americans realize they can no longer afford a new car.
On the shifting energy mix, tariff impacts, and carbon capture
Current conditions: Europe just experienced its warmest March since record-keeping began 47 years ago • It’s 105 degrees Fahrenheit in India’s capital Delhi where heat warnings are in effect • The risk of severe flooding remains high across much of the Mississippi and Ohio Valleys.
The severe weather outbreak that has brought tornadoes, extreme rainfall, hail, and flash flooding to states across the central U.S. over the past week has already caused between $80 billion and $90 billion in damages and economic losses, according to a preliminary estimate from AccuWeather. The true toll is likely to be costlier because some areas have yet to report their damages, and the flooding is ongoing. “A rare atmospheric river continually resupplying a firehose of deep tropical moisture into the central U.S., combined with a series of storms traversing the same area in rapid succession, created a ‘perfect storm’ for catastrophic flooding and devastating tornadoes,” said AccuWeather’s chief meteorologist Jonathan Porter. The estimate takes into account damages to buildings and infrastructure, as well as secondary effects like supply chain and shipping disruptions, extended power outages, and travel delays. So far 23 people are known to have died in the storms. “This is the third preliminary estimate for total damage and economic loss that AccuWeather experts have issued so far this year,” the outlet noted in a release, “outpacing the frequency of major, costly weather disasters since AccuWeather began issuing estimates in 2017.”
AccuWeather
Low-emission energy sources accounted for 41% of global electricity generation in 2024, up from 39.4% in 2023, according to energy think tank Ember’s annual Global Electricity Review. That includes renewables as well as nuclear. If nuclear is left out of the equation, renewables alone made up 32% of power generation last year. Overall, renewables added a record 858 terawatt hours, nearly 50% more than the previous record set in 2022. Hydro was the largest source of low-carbon power, followed by nuclear. But wind and solar combined overtook hydro last year, while nuclear’s share of the energy mix reached a 45-year low. More solar capacity was installed in 2024 than in any other single year.
Ember
The report notes that demand for electricity rose thanks to heat waves and air conditioning use. This resulted in a slight, 1.4% annual increase in fossil-fuel power generation and pushed power-sector emissions to a new all-time high of 14.5 billion metric tons. “Clean electricity generation met 96% of the demand growth not caused by hotter temperatures,” the report said.
President Trump’s new tariffs will have a “limited” effect on the amount of solar components the U.S. imports from Asia because the U.S. already imposes tariffs on these products, according to a report from research firm BMI. That said, the U.S. still relies heavily on imported solar cells, and the new fees are likely to raise costs for domestic manufacturers and developers, which will ultimately be passed on to buyers and could slow solar growth. “Since the U.S.’s manufacturing capacity is insufficient to meet demand for solar, wind, and grid components, we do expect that costs will increase for developers due to the tariffs which will now be imposed upon these components,” BMI wrote.
In other tariff news, the British government is adjusting its 2030 target of ending the sale of new internal combustion engine cars to ease some of the pain from President Trump’s new 25% auto tariffs. Under the U.K.’s new EV mandate, carmakers will be able to sell new hybrids through 2035 (whereas the previous version of the rules banned them by 2030), and gas and diesel vans can also be sold through 2035. The changes also carve out exemptions for luxury supercar brands like McLaren and Aston Martin, which will be allowed to keep selling new ICE vehicles beyond 2030 because, the government says, they produce so few. The goal is to “help ease the transition and give industry more time to prepare.” British Transport Secretary Heidi Alexander insisted the changes have been “carefully calibrated” and their impact on carbon emissions is “negligible.” As The New York Timesnoted, the U.S. is the largest single-country export market for British cars.
The Environmental Protection Agency has approved Occidental Petroleum’s application to capture and sequester carbon dioxide at its direct air capture facility in Texas, and issued permits that will allow the company to drill and inject the gas more than one mile underground. The Stratos DAC plant is being developed by Occidental subsidiary 1PointFive. As Heatmap’s Katie Brigham has reported, Stratos is designed to remove up to 500,000 metric tons of CO2 annually and set to come online later this year. Its success (or failure) could shape the future of DAC investment at a time when the Trump administration is hollowing out the Department of Energy’s nascent Carbon Dioxide Removal team and casting doubt over the future of the DOE’s $3.5 billion Regional Direct Air Capture Hubs program. While Stratos is not a part of the hubs program, it will use the same technology as Occidental’s South Texas DAC hub.
The Bezos Earth Fund and the Global Methane Hub are launching a $27 million effort to fund research into selectively breeding cattle that emit less methane.