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From the source to the registers.

The term “heat pump” refers to any system that can extract heat from a colder space and transfer it to a warmer one. For example, refrigerators use heat pumps to remove heat from inside the fridge and expel it into your kitchen. Air conditioners use heat pumps to remove heat from inside the house and dump it outside. In this guide, the phrase “heat pump” refers specifically to HVAC equipment that is capable of both heating
and cooling the air inside a home. In other words, we’re talking about air conditioners that can also run in reverse, pulling heat from outside on a winter day and pumping it inside.
We’ve created this guide because when it comes to getting off fossil fuels, it does matter what you replace them with. Climate advocates tout electric heat pumps because they can create two to three times more heat per unit of energy than other heating equipment. Electric resistance heating, by contrast, is extremely wasteful, and if people start installing those systems en masse, that could actually increase emissions in the near term and make it more difficult to decarbonize the economy in the long term. By getting a heat pump, you won’t just be cutting emissions, you’ll be reducing the cost of cleaning up the electric grid because we’ll need less electricity overall.
That said, a poorly designed or installed system can negate many of the benefits that heat pumps have to offer. Whether you’re reading because you want to cut emissions, or save money on energy, or take advantage of the steady, quiet comfort heat pumps provide, it’s essential to do your homework and find a good contractor to work with. In this guide, we’ll cover how to know when it’s the right time to get heat pumps, the basics of understanding what your options are, common misconceptions about heat pumps, how to find and vet contractors, and more.
Larry Waters is the founder and president of Electrify My Home, a heating and air conditioning contractor in Northern California that specializes in heat pumps. Waters has worked in the HVAC industry for more than 40 years.
D.R. Richardson is the co-founder of Elephant Energy, a Boulder, Colorado-based startup that helps homeowners in Colorado and Massachusetts electrify by using building science and proprietary software to ensure good system design, and by managing all aspects of the project.
Jake Marin is the senior emerging opportunities manager for VEIC, a clean energy nonprofit that administers Vermont and D.C.’s energy efficiency programs among other decarbonization work across the country. Marin ran VEIC’s HVAC program for nearly 8 years and was recently given a “Champion of Energy Efficiency” award for his pioneering work bringing heat pumps to Vermont.
There are many, many kinds of electric heat pumps used for space heating and cooling. At a high level, there are two main categories that homeowners can typically choose from:
Within each of these are a handful of installation options:
The above designs aren’t mutually exclusive. You can install a system that’s fully ducted, fully ductless, or a combination of both. You can also combine a heat pump system with a fuel-burning furnace or boiler, known as a dual-fuel system. If aesthetics are important to you, there are also companies like Quilt that offer versions that can better integrate into the look of your home.
“Ductwork in unfinished space is easy. Ductwork in finished space is so expensive and hard that we typically don't recommend it,” said Richardson.Heat pumps also come in models with different “speeds” or “stages”:
There are also some technical specifications to be aware of, such as seasonal efficiency ratings:
The highest rated SEER2 device may have a lower HSPF2 rating, while the highest rated HSPF2 device may have a lower SEER2 rating.
Finally, heat pumps also come in many different sizes. Having a properly sized system is one of the most important factors for ensuring your heat pumps run efficiently and last a long time.
A good contractor will be able to walk you through different system designs and equipment options to find the answer that’s best suited to your house, your goals, and your budget.
“There’s a lot of companies out there that offer just what they have in the catalog and their salespeople can’t sell anything outside of that,” Waters told me. “That means the customer is going to get matched with that cookie cutter option if they go with that company. So how to choose a contractor is one of the most important things.”
Many people are used to setting their HVAC systems to different temperatures at different times of day — one temp for the morning and evening, another for when they leave for work, and another for bedtime. This makes sense with many furnaces and air conditioners because they’re usually designed to cycle on, blast hot or cold air at full capacity until they achieve the temperature you want, and then turn off, so turning down the system when you’re not home can save a lot of energy. But the most efficient “variable speed” heat pumps work differently — they use a lot of energy to reach a certain temperature, but once they hit it, they sip small amounts of energy to maintain it. Experts say a “set it and forget it” approach will give you the most efficient performance and the most consistent energy bills.
“Don’t worry about the number,” says Marin. “Just find your comfortable temperature, and then leave it alone, forget it’s even there.”
This topic can be divisive among HVAC experts, but in most of the continental U.S., you should be able to find a heat pump solution that will heat your home efficiently on the coldest winter days. The key is that the system has to be sized correctly. Richardson’s company, Elephant Energy, works in Colorado, where he says they’ve had two years in a row with days that got down to -13 degrees Fahrenheit, “and our fleet of hundreds of heat pumps have cranked out heat to keep homes nice and warm on those coldest days.”
There still may be scenarios where you
want to keep your furnace as a back-up, even if it’s not strictly necessary.
If you’re switching from fuel oil, propane, or electric resistance heating, you’re pretty much guaranteed to save money on your bills with heat pumps. But if you’re switching from natural gas, it really depends on where you live.
Richardson says that for a lot of his customers in Colorado, making the switch from gas to inverter heat pumps is cost neutral — they end up paying a bit more for heating in the winter but less for cooling in the summer, since the heat pump is often more efficient than whatever air conditioning they were replacing. At the same time, those who don't have air conditioning to start with could end up paying a bit more year-round.
Do you…
Short answer: Hold off on a heat pump, invest in weatherization.
Long answer: You may have arrived at this guide because you’re interested in decarbonizing your home, but if you have a relatively new heating and/or cooling system, it could actually be worse, emissions-wise, to replace it, due to the embedded carbon that went into manufacturing that equipment. Unless you’re really desperate to replace your existing system for comfort or financial reasons (if you have electric resistance heaters, for example, switching to heat pumps could save you a lot of money, since they use about a third of the electricity), we recommend getting a bit more life out of it first.
In the meantime, put your enthusiasm for decarbonization into making your home more efficient. Insulating and air sealing your home before you get heat pumps will help you save money in the near term and get you the best results from heat pumps later on.
Short answer: Consider a dual fuel system
Long answer: If you really need a new air conditioning system but your heater still has a lot of life left in it, consider installing a heat pump to work alongside your existing furnace or boiler. That way, you’ll get efficient cooling capacity that will save you money in the summer, and you’ll also be able to cut down on your fossil fuel consumption in the winter. You can set the heat pump to warm your home until it gets down to a certain temperature outside, at which point your furnace or boiler will kick in. (Many heat pump models can operate in very cold temperatures, so having a backup heating system like this is not necessary, but it may be a good intermediate step in certain cases.)
Short answer: It’s the perfect time to think about heat pumps!
Long answer: HVAC equipment typically lasts for 15 to 20 years, so 10 years is probably the earliest you would want to start thinking about a replacement. It’s probably safe to wait a few years longer, but you definitely don’t want to wait until your existing system breaks to start your heat pump journey. A heat pump retrofit can be a months-long process, from finding contractors, to evaluating quotes, to refining your plan, to getting permits and scheduling the work. If you’re in an emergency situation where your boiler broke and you really need heat, you could be forced to settle for a less-than-ideal solution. At the very least, start your research now and consider weatherization upgrades.
Short answer: Get a mini-split!
Long answer: Ductless mini-split heat pumps are a no-brainer to provide heating and cooling to a single room or zone. They can be very affordable — and in some cases free — with rebates and tax credits. If you want to retrofit the rest of your home to use heat pumps down the line, this will help you get familiar with the technology and will not preclude you from adding more later — though it is helpful to tell your contractor that now so they can take it into account.
Heat pumps can be a major investment. If you just want to add heating or cooling capacity to one or two rooms, it can cost $5,000 to $7,000 per room, on average, before incentives, Richardson told me. A whole-home solution averages $20,000 to $30,000 before incentives, but depending on the home and the system design can go much higher.
Do you have some rooms that are hotter in the summer or colder in the winter than others and you want to make your home more comfortable overall? Or is your goal to get better air filtration and ventilation? Or do you simply want to get off fossil fuels? It will be helpful to think through what you want to achieve and communicate that to your contractor so they can take that into account when they design your system.
The federal government offers a 30% tax credit for heat pumps, up to $2,000, not including labor, for certain energy efficient models. (Note that you can only get the full tax credit if you have $2,000 or more in tax liability the year you install the heat pumps.) The credit can’t be rolled over to the next tax year, but you can claim it in multiple years. Your state energy office, city, or utility may offer additional tax credits or rebates.
It’s important to learn about what’s available in your area before reaching out to contractors because some rebate programs require you to work only with approved partners. Also, the contractors you reach out to might not always be up to date on the latest incentive programs, so it’s a good idea to do some independent research and make sure you find someone who knows how to help you take advantage. There is, unfortunately, not yet any single directory where you can enter your zip code and find out about every possible rebate opportunity everywhere in the country, so it’s best to check multiple sources of information:
As with all home renovation projects, we strongly recommend getting at least three quotes from different contractors.
Heat pumps are common in some parts of the country, but in others it might be difficult to find a contractor who really knows their stuff. Dip your toes in a heat pump Reddit forum and you’ll find scores of homeowners asking what to do after a contractor told them that heat pumps don’t work and they should just stick with gas. Here are a few strategies for finding high quality heat pump contractors, in order of what we recommend:
Finding the right contractor is probably the most important decision you’ll make in this entire process, and it’s not uncommon to get quotes with wildly different recommendations. Here are some questions you can ask to help you get a sense of who really knows what they are talking about and is willing to go the whole nine yards to make sure you get a properly designed system:
Manual J is a formula that helps a contractor identify the right size HVAC system for your home. It requires taking detailed measurements throughout the building, inspecting your home’s insulation and other elements that will affect airflow and heat retention, and performing tests such as the “blower door” to assess how leaky your building’s envelope is. If you’re interested in using your ductwork or installing new ductwork, they should also perform a “Manual D” calculation. Waters told me that despite these calculations being industry standards, very few contractors actually go through the trouble of doing them. “What this does, it tells us exactly what size system I need for heating and cooling, and exactly how much air goes into each room,” he said.
Richards agreed, adding that you may want to ask what technology they use to size the system. “You need somebody who has a technology-driven tool that can actually measure the heating and cooling requirements of your home,” he says. “Are you doing a true Manual J, or are you sort of sticking your finger up in the air?”
If your contractor only works with one brand of equipment, you’re more likely to get a solution that’s convenient for them rather than one that’s custom designed for you.
Waters told me the registers — the vents that release air into a given room — are critical for occupant comfort. If your existing ductwork is designed to distribute air from a furnace, your registers may be designed to push air into the middle of the room. But with heat pumps, you want the air either pushed up toward the ceiling if the vents are down low or across the ceiling if they are up high, so that the house doesn’t feel drafty and you get proper circulation.
If you’re starting with heat pumps but you eventually want to electrify your stove, your clothes dryer, or your car, your home may need an electric panel upgrade or an electric service upgrade from the utility. What you don’t want is to put in heat pumps that eat up the rest of your home’s capacity and then have to deal with pricey upgrades down the line.
The Building Performance Institute and North American Technician Excellence are two organizations that train and certify contractors, auditors, and technicians in the latest building science and best practices. A certification doesn’t guarantee you’ve found the right contractor — it could mean they know a lot about installing heat pumps but still don’t know much about the models that work in the coldest climates, for instance. But it’s a helpful data point that shows they are investing in training.
After you’ve found a contractor or company to work with, settled on a system design, and secured financing, your installer is going to need to secure permits for the work. Then you’ll need to schedule the installation, which, depending on how busy your contractor is, can take several weeks to several months. The actual work should take one to three days, depending on how complicated it is.
Also — talk to your contractor about maintenance. Be sure to clean the filters regularly and do anything else they recommend to get the best performance and longest life out of your equipment.
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A new report shared exclusively with Heatmap documents failures of transparency and governance at the Greenhouse Gas Protocol.
It is something of a miracle that tens of thousands of companies around the world voluntarily report their greenhouse gas emissions each year. In 2025, more than 22,100 businesses, together worth more than half the global stock market, disclosed this data. Unfortunately, it’s an open secret that many of their calculations are far off the mark.
This is not exactly their fault. To aid in the tedious process of tallying up carbon and to encourage a basic level of uniformity in how it’s done, companies rely on standards created by a nonprofit called the Greenhouse Gas Protocol. The group’s central challenge is ensuring that its standards are both credible and feasible — two qualities often in tension in greenhouse gas accounting. The method that produces the most accurate emissions inventory may not always be feasible, while the method that’s easy to implement may produce wildly inaccurate results.
Critics have long faulted the Protocol for allowing companies to look far better on paper than they do to the atmosphere. In 2022, the group began in earnest to try and fix this, starting with an overhaul of its governance. It created a new Independent Standards Board that would oversee and approve updates to each of its accounting rules, and later convened a series of technical working groups to develop the substance of those updates. One such group was updating the method for how companies should account for their electricity use. Another was focused on supply chain emissions.
The working groups would meet regularly to put together proposals and then submit those proposals to the Independent Standards Board for approval. A separate steering committee would then review the board’s decision to ensure that the Protocol’s overall principles had been followed throughout the process and make the final call.
The new structure was meant to “further bolster the credibility and integrity of these standards,” the Protocol wrote. The overhaul was especially timely as governments around the world, including those of the European Union and the state of California, were taking steps to adopt the Protocol’s standards in their own mandatory climate disclosure rules.
But what started as a laudable effort to improve transparency and accountability has turned rancid, some of the participants told me. Scientists are being pitted against industry representatives. Proposals, voting records, and other key documents are being kept from the public eye. Decisions made behind closed doors are going undocumented and undisclosed, kept secret even from the working group members who have devoted significant unpaid time to the cause of developing stronger standards.
These issues are broadly illustrated by the experience of Kate Dooley, a member of the GHG Protocol’s technical working group on forest carbon accounting. Dooley is a political scientist and lecturer at the University of Melbourne’s School of Geography, Earth and Atmospheric Sciences who has worked on issues related to forest carbon accounting for roughly two decades. She joined the 17-person working group in December 2024; the group’s assignment was to resolve a contentious debate over how companies that own or control forests or use forestry products in their supply chains should account for carbon emissions related to their harvesting, land management, and wood product purchases. The group included academics like Dooley, industry representatives from companies such as IKEA, and experts from non-profits including the Natural Resources Defense Council and the American Forest Foundation.
After six months of meetings, however, the members could not reach a consensus. One of the key reasons forest carbon accounting is difficult is that forests can both emit carbon and remove it from the atmosphere. Determining what proportion of those removals are a result of human activity versus what would happen naturally gets complicated quickly. The stakes were high, because even though the GHG Protocol standards are portrayed as neutral accounting exercises, small decisions about how this accounting is performed can create big shifts in incentives for how companies operate.
The forestry group considered two main approaches. One is called the “managed land proxy,” or MLP, and it is the method countries use to report their emissions to the United Nations. This method would allow companies to include all of the carbon that’s being sequestered on their lands in their greenhouse gas inventory. A timber company that cuts down trees, for instance, would count both the emissions released from logging as well as the carbon sequestered by the remaining tree stands and calculate a net result.
The major criticism of this approach is that it’s easy to game and leads to unintuitive results, where forest product companies come out looking like they are removing far more carbon than they are releasing. The method would also enable companies to use the average emissions and removals of an entire region in their calculations, rather than the specific logging and forest management practices of their supply source. Another risk is that companies could simply buy up additional forest land to reduce their emissions on paper while changing nothing about their business practices.
Proponents of this method put forward what they framed as a compromise, called “MLP+,” which attempted to put some guardrails around these issues. Regardless, the scientists in the group argued that it was scientifically incorrect to attribute all forest carbon sequestration that happens within a given tract of land to a company when that carbon removal may be the result of unrelated factors such as elevated CO2 in the air from climate change, or that a previous owner had cut down trees that were now growing back.
The alternative method that the scientists, including Dooley, put forward is called “activities-based accounting.” Rather than take credit for all forest growth, this method would require landowners to account for the growth that would have occurred without human interference and subtract it from their estimate of carbon removals. This method would be more difficult and require further work to fine-tune. It would also have the effect of making corporate forest emissions look much higher on paper.
In a final vote between two proposals, the members split 8 to 7 in favor of MLP+, with two sitting out the vote. The group delivered both proposals to the Independent Standards Board for consideration last spring, but the board could not reach a consensus, either. Ultimately, the organization decided to finalize the land sector standard in January 2026 without any guidance for forest carbon accounting, advising companies to go with whatever method they wanted as long as they disclosed how they did it. It noted that it would soon issue a request for information to gather more stakeholder input on the issue.
By the end of the working group process, the internal dynamics had grown combative. Dooley and other scientists in the group had presented certain scientific papers to support their rebuke of MLP, but another member, Nathan Truitt, the executive vice president of climate funding at the American Forest Foundation, began arguing that the same papers made the opposite point.
“It was this weird, Kafka-eque development,” Dooley said. She responded to the entire group with a long email detailing the last 20 years of debate on the subject, she told me. “I think in that email I accused [Truitt] of industry bias, because there was no other explanation for what he was doing,” she said.
The American Forest Foundation works with private landowners to support sustainable forest product markets. Truitt, for his part, characterized the atmosphere in the working group as toxic. He told me that the scientists did not adequately explain to him why they thought he was interpreting the papers incorrectly. He noted that the foundation is a mission-based nonprofit, and less than 5% of its revenues comes from the forest products industry, but the organization does believe in supporting healthy forest markets. “If landowners can’t generate revenue from appropriate forest management, there won’t be forest there very long,” he said.
But Dooley’s concerns were bigger than just interpersonal challenges. She didn’t understand why none of the explanatory memos or official proposals produced by the working group had been published to the Protocol’s website, when similar documents produced by the other working groups had been made public. (Truitt also was not aware of this until I reached out to him, and was surprised to learn it.)
Initially, the scientists’ full memo on their approach was not even shown to the Independent Standards Board; Dooley told me she had to write to the head of the board and ask that it be shared. It was also odd to her that there was no follow-up from the Independent Standards Board after the proposals had been submitted.
Perhaps one of the strangest elements of the process was that the Greenhouse Gas Protocol had conducted a real-world pilot program of MLP prior to the formation of the working group. There was public documentation of the pilot’s existence, but the outcomes were not published, nor were they shared with the group. Dooley said that someone who had viewed the results told her they decidedly proved the problems with MLP. Her understanding was that almost all of the forest product companies that participated reported huge amounts of net carbon removals, making them appear to have a beneficial impact on the climate, contributing nothing to global emissions. “To me, it’s inexplicable why that pilot study wasn’t shown,” she said.
Months later, in January 2026, Dooley received a document that reframed her experience. It was a formal complaint made by Truitt the previous April that challenged the scientists’ expertise and impartiality, she told me. She also learned that following the complaint, the Independent Standards Board solicited opinions from additional outside scientists on the two proposals. She was shocked that she had been kept in the dark as this was going on.
Dooley emailed the head of the board and other leaders at the Protocol to ask why she and the other scientists weren’t told about the complaint or given a chance to respond. “We write to express concern that this complaint was not initially communicated to those concerned, and to request clarification regarding its handling and any subsequent developments,” the email said. She also inquired about the unpublished proposals and lack of follow-up from the board. She sent the email on January 23. She has yet to receive a response, she said.
“It strikes me as a very bizarre process,” she told me. “It’s unacceptable.”
When I spoke to Truitt about the complaint, he told me he did not mean to suggest that Dooley and the other scientists’ perspective was invalid. On the contrary, Truitt was concerned that there weren’t more experts in the working group, or at least more of the right experts. In 2024, the Intergovernmental Panel on Climate Change had hosted a three-day meeting in Italy specifically about the issues with forest carbon accounting, albeit at the national level. Truitt read the final report that came out of that meeting and didn’t understand why none of the scientists involved were on the Protocol’s technical working group.
Initially he wanted to share this concern with the working group directly, he said, but third-party consultants hired to facilitate the group’s progress advised him to bring it to the Protocol’s staff. He did that, and again asked to share it with his colleagues so that it would at least be in the group’s records, but was instructed not to, he said.
Truitt told me his complaint urged the Protocol to invite some of the experts from the IPCC meeting to join the working group. He said that the head of the Independent Standards Board later told him there was not enough time, but that the board would consult with some of those experts once it had the proposals.
The GHG Protocol did not answer detailed questions I sent them for this story. “We are in the process of addressing, through an independent review, a few concerns relating to work within one of our Technical Working Groups,” a spokesperson told me in an email. “As this is an internal ongoing matter, we cannot comment further but we are committed to addressing any findings appropriately.”
The spokesperson also emphasized that robust debate was central to the standard-setting process, and that the organization is “committed to ensuring that all discussions are conducted in a respectful, transparent and well-facilitated manner, with clear governance structures in place to support balanced and evidence-based outcomes. We value all inputs and feedback on how to improve our multistakeholder processes.”
While Truitt and Dooley vehemently disagree on forest carbon accounting and what went wrong in the working group, they are on the same page about one thing — the Protocol has issues with transparency. A new paper published Wednesday argues that the issues Dooley described are systemic, and warns that the Protocol seems to be moving further away from its commitment to accountability.
The paper’s author is Danny Cullenward, an economist and lawyer focused on the scientific integrity of climate policy, who is currently a senior fellow at the University of Pennsylvania’s Kleinman Center for Energy Policy. Cullenward also sits on the Protocol’s Independent Standards Board and is restricted by a non-disclosure agreement from describing what he has witnessed in the role. His paper draws on publicly available information in an effort not to violate his NDA. (Cullenward has also contributed to Heatmap.)
Part of what drove Cullenward to write the piece were concerns outlined in a complaint he and another board member filed jointly to the Protocol. While Cullenward could not discuss the substance of the complaint, his paper notes that it alleges “violations of the Board’s terms of reference,” and that the violations “undermined the scientific integrity of the Board’s deliberations” over the land sector standard.
“I do not have any confidence that we are going to end up in a place where there is public disclosure about what occurred,” he told me, “and that is concerning.”
His paper critiques the Protocol’s formal complaints process more generally, noting that it does not describe how complaints should be adjudicated. Because the Independent Standards Board is bound by an NDA, filing a complaint is the only means by which members can flag malfeasance. If these complaints are then adjudicated in private, there is no “external mechanism to ensure that the Protocol’s overall governance rules are being followed in practice,” Cullenward writes.
He further highlights two overarching failings at the Protocol. The first is that the group’s two key decisionmaking bodies — the Independent Standards Board and the Steering Committee — are imbalanced. The former has members from industry, academia, and government, but no one from environmental non-governmental organizations. More than half the members on the latter are from the business and financial world, and the Steering Committee does not have a single member from the research community.
Not only does the nonprofit community not have a voice on the board, Cullenward writes, but the absence of those voices “risks politicizing the work of scientist Board members.” While the Protocol’s official decision-making hierarchy deems scientific integrity as its top priority, in practice, scientists are left to defend the science to the business community. If and when contentious scientific issues do arise and the board’s decisions are elevated to the Steering Committee, there is no one on that committee with the training to evaluate the disagreement.
Cullenward also criticizes the Protocol for not publishing records from the Independent Standards Board’s meetings, despite the fact that the board’s governance documents explicitly require the publication of meeting minutes. The board’s votes are done by secret ballot, the report says, so members themselves cannot even see how each other voted. Cullenward calls for this rule to be lifted, for votes to be public, and for board members not to be restricted by NDAs. “A well-functioning organization that follows its own rules does not need to restrict Board members’ legal ability to speak about their experiences,” he writes.
Lastly, Cullenward warns that the Protocol seems to be heading down a path of increasing opacity. Last fall, the group announced that it was planning to harmonize its standards with the International Organization for Standardization, or ISO, a separate, much larger group that writes voluntary standards for all kinds of industries. (To date it has written more than 26,000 standards, applying to everything from screw threads and paper sizes to food safety and electrical grids.) The GHG Protocol published new rules governing this joint work, which, unlike the technical working group rules, do not require members’ names be public or a balanced representation of stakeholders.
One of these joint working groups has already been convened, and while the GHG Protocol published the names of the members it nominated to the group on its website, the ISO-nominated members are not listed, and the total group size is unclear. It’s also unclear what this harmonization process will look like, and whether it will involve another overhaul of all of the standards the Protocol has spent the past several years revising.
I reached out to a few other carbon accounting experts for their thoughts on Cullenward’s paper. Michael Gillenwater, the executive director of the Greenhouse Gas Institute, who is in one of the other technical working groups, told me the concerns raised about bias go back to the origins of corporate climate accounting. The focus has long been on “what companies want to report and claim versus what is technically fit for the evolving range of purposes that the GHG Protocol has been and is newly being used for,” he said.
Matthew Brander, a professor of carbon accounting at the University of Edinburgh who also serves on a technical working group, told me he agrees that commercial interests are overrepresented among the working groups — not just in terms of numbers, but also in the amount of time and resources they can spend to engage and lobby for their preferred outcomes. Despite the Protocol’s claim of being “science-led,” he told me, scientific research is often ignored. Brander was also frustrated with the complaints procedure, telling me that a complaint he submitted did not get a substantive response.
“I don’t think there is ever a perfect way of managing/governing standard-setting processes,” he said in an email, “and commercial interests will very often hold sway.”
While Cullenward told me he thought improving transparency and representation would help alleviate many of his concerns, Dooley was less sure.
“The idea that science speaks as an independent, authoritative voice is a myth,” she said. “It’s actually what my research is about. Lots of science is politicized and can be used to support any side of the debate generally. But the way the process was set up very much leant into that and allowed that to happen, rather than mitigated against that.”
Just as demand for batteries is intensifying.
The energy impacts of the continued crisis in the Persian Gulf are obvious. Countries that rely on the natural gas and oil from the region are dealing with higher prices, and in some cases are trying to tamp down their demand for fuel and electricity to keep prices under control, not to mention maintain basic energy availability.
But it’s not just gas-fired power plants and internal combustion engines that are feeling the pinch.
The consequences of the effective closure of the Strait of Hormuz go well beyond the set of energy commodities typically associated with the Persian Gulf, including a vast array of minerals and petrochemicals, including many necessary to produce clean energy. We’ve already covered aluminum, a key component of solar panels, cars, and batteries, which requires so much energy for processing that almost 10% of it is produced in the Middle East, where fuel is abundant.
Now another chemical essential to the battery supply chain is seeing price hikes and supply reductions: sulfuric acid.
Sulfuric acid is used in refining and processing several metals and minerals key to the energy transition, including copper, cobalt, nickel, and lithium. Copper is used throughout EVs and other clean technologies, while nickel and cobalt are used in cathodes in lithium-ion batteries — which, of course, also contain lithium. Shortages or higher prices of sulfuric acid could lead to shortages or higher prices for batteries and electric vehicles, just as consumers flock to them to help mitigate the impacts of rising fossil fuel costs.
Sulfur is a byproduct of oil and natural gas refining, hence about half of seaborne sulfur comes from the Middle East, according to Argus Media, but only a handful of sulfur-bearing vessels have transited the Strait of Hormuz since the war began. In response to the disruption, China, the world’s top exporter of sulfuric acid, began restricting shipments abroad, according to S&P.
Sulfuric acid “is an irreplaceable input in the manufacture of renewable energy materials, such as silicon wafers in solar panels; the nickel, cobalt, and rare earths in wind turbine magnets and electric vehicle (EV) motors; and the copper wiring in every grid connection and transformer,” wrote Atlantic Council fellow Alvin Camba in an analysis for the think tank.
“Most elemental sulfur comes from the Middle East,” Camba told me, “and it goes to places like Indonesia,” where metals are processed to “produce the batteries for a lot of vehicles for companies like Tesla, BYD, and Honda.”
Shortages of sulfuric acid will likely hit Indonesia especially hard. The country produces about 60% of the world’s nickel, but has only about a month’s inventory of sulfur, according to a team of Morgan Stanley analysts. “We believe the energy shock is reverberating and will sustain beyond the reopening of the Strait of Hormuz,” the analysts wrote of China’s export restrictions. “It will keep fuel markets tighter, lift the cost curve for Indonesian nickel, and raise refining margins in Asia. Higher energy prices will show up in food, tech and battery supply chains.”
Already, according to Morgan Stanley, “several” Indonesian nickel producers have reduced their output by at least 10% from last month. In the Democratic Republic of Congo, copper and cobalt miners are reducing their use of chemicals in their operations and considering cutting output.
Battery manufacturers are already seeing higher costs for their materials. The Chinese battery giant (and Tesla supplier) CATL saw its profit margins decline quarter-over-quarter revenue growth due to “cost pressure,” Morningstar analyst Vincent Sun wrote last week in a note to clients — and that’s despite greater sales volumes as consumers attempt to escape fossil fuel-dependency. As sulfuric acid rises in price, the battery companies will also be competing with agribusiness, who use sulfuric acid to produce phosphate fertilizers, Camba told me.
Even Ivanhoe Mines chief executive and metal and mining mega-bull Robert Friedland said in a statement last week, “If the closure of the Straits of Hormuz continues … second-derivative effect will be on global copper production due to the shortage of the world’s most important industrial chemical, sulfuric acid.” Friedland described the market for sulfur and sulfuric acid as “extremely tight.”
That also spells bad news for lithium, the namesake mineral used in EV batteries. Around half of global lithium production comes from spodumene, a hard rock mined largely in Western Australia. Refining that rock requires a “shitload’ of sulfuric acid, Nathaniel Horadam, the founder and president of Full Tilt Strategies, told me, through an energy intensive process known as “acid baking.”
Australian mines were already suffering from high diesel prices and shortages due to the conflict in Iran, according to Argus Media. The high price of sulfuric acid could put a squeeze on margins for lithium refining, which largely occurs in China.
“If their production costs go up, that’s going to be factoring into their market pricing,” Horadam said. “I would expect all those prices to go up in the short to medium term until this stuff kind of settles.”
The other major threat to battery makers specifically, Horadam said, was shortages of petrochemicals like ethylene, which is used in the production of plastics, and polyethylene, a polymer often used in plastic bags.
Ethylene is often made from ethane, a natural gas liquid, or naphtha, a refined petroleum product and production in the Persian Gulf has been severely disrupted by the Hormuz crisis. As of March, Asian petrochemical producers had already reduced their output in anticipation of shortages.
Polyethylene is also a crucial component in lithium-ion batteries, where it’s often used in the “separator,” which physically divides the cathode from the anode. Even the Trump administration has thrown its support behind polyethylene in battery manufacturing A $1.3 billion loan from the Department of Energy’s in-house bank to finance a separator manufacturing facility in Indiana survived the Trump administration’s gutting of that office, with $77 million getting disbursed last September. (Notably, the Trump-era announcement dropped a reference to electric vehicles and instead enumerated separators’ uses in “data centers, energy storage, and consumer electronics.”)
Over 40% of lithium-ion separators are produced in China with the “bulk” of them produced in Asia, according to the DOE, which makes support for domestic production paramount to maintaining international competitiveness and domestic supply chains.
“We’re relying on the Chinese and Japanese to produce all our separators and electrolytes and such,” Horadam said. “This sulfuric stuff is getting all the attention because it’s pretty obvious in terms of visible, salient minerals that are directly impacted, but I wouldn’t sleep on separators and binding agents.”
The opinion covered a host of actions the administration has taken to slow or halt renewables development.
A federal court seems to have struck down a swath of Trump administration moves to paralyze solar and wind permits.
U.S. District Judge Denise Casper on Tuesday enjoined a raft of actions by the Trump administration that delayed federal renewable energy permits, granting a request submitted by regional trade groups. The plaintiffs argued that tactics employed by various executive branch agencies to stall permits violated the Administrative Procedures Act. Casper — an Obama appointee — agreed in a 73-page opinion, asserting that the APA challenge was likely to succeed on the merits.
The ruling is a potentially fatal blow to five key methods the Trump administration has used to stymie federal renewable energy permitting. It appears to strike down the Interior Department memo requiring sign-off from Interior Secretary Doug Burgum on all major approvals, as well as instructions that the Interior and the Army Corps of Engineers prioritize “energy dense” projects in ways likely to benefit fossil fuels. Also struck down: a ban on access to a Fish and Wildlife Service species database and an Interior legal opinion targeting offshore wind leases.
Casper found a litany of reasons the five actions may have violated the Administrative Procedures Act. For example, the memo mandating political reviews was “a significant departure from [Interior] precedent,” and therefore “required a ‘more detailed justification’ than that needed for merely implementing a new policy.” The “energy density” permitting rubric, meanwhile, “conflicts” with federal laws governing federal energy leases so it likely violated the APA, the judge wrote.
What’s next is anyone’s guess. Some cynical readers may wonder whether the Supreme Court will just lift the preliminary injunction at the administration’s request. It’s worth noting Casper had the High Court’s penchant for neutralizing preliminary injunctions in mind, writing in her opinion, “The Court concludes that the scope of this requested injunctive relief is appropriate and consistent with the Supreme Court’s limitations on nationwide injunctions.”