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Five findings from an extremely thorough study by the National Renewable Energy Lab.
Some Americans install heat pumps because they care about climate change. But most people aren’t going to make the switch until it makes sense economically. Pinpointing where and for whom heat pumps are a good investment is surprisingly tricky because U.S. housing is so diverse, with a wide range of building sizes and ages, situated in different local climates with different utility rates.
But for the first time, researchers at the National Renewable Energy Lab have sorted through much of this complexity to get deeper to the truth about the costs, benefits, and challenges of deploying heat pumps in the U.S.
Ultimately, they found that heat pumps are a cost-effective choice in roughly 65 million U.S. homes, or about 60% of the country — and that’s before taking into account available subsidies. But there are substantial economic barriers to widespread adoption.
It’s hard to overstate how detailed the study is. The authors started with a model of 550,000 statistically representative households — basically housing archetypes that typify different combinations of building size, age, occupancy level, local climate, heating usage patterns, and existing heating systems. Each one represents about 242 real-world households. Then the authors looked at how switching to a heat pump would affect greenhouse gas emissions and energy bills across all of these different homes in a wide range of scenarios. They considered heat pumps with lower and higher efficiency ratings, and whether or not the building owner pursued insulation upgrades. They looked at different scenarios for how quickly the grid would decarbonize, how sensitive the results were to energy prices, and how subsidies from the Inflation Reduction Act affect the economics.
The paper has many interesting findings beyond the top-line result. Here are five things that stood out.
Eric Wilson, a senior research engineer at NREL and the study’s lead author, told me one of his motivations was to try to settle the question of whether heat pumps reduce emissions.
“I see a lot of people saying, well, the grid is still dirty in this state, and maybe it makes sense to wait five years to put in a heat pump because it could increase emissions,” he said.
But he found that in each of the 48 contiguous U.S. states, switching to a heat pump reduces emissions today, even if that heat pump is one of the cheaper, less-efficient models. Heat pumps are just so much more efficient than other options that they still reduce emissions despite today’s relatively dirty grid.
On average, each home could cut between 2.5 to 4.4 tons of carbon over the approximately 16 years the equipment lasts, meaning widespread adoption could result in a 5% to 9% drop in national economy-wide emissions. The effect is much more pronounced in some states, like those in the Northeast, where a lot of homes currently use fossil fuels for heating. A household in Maine that installs a high efficiency model, combined with completing insulation upgrades, would reduce emissions by an average of 11 tons per year — or about the equivalent of taking two cars off the road for a year.
The study breaks down the costs of switching to a heat pump in a few different ways.
First, there’s the up-front costs of upgrading to a heat pump, which are relatively high. A lower-rated, less efficient heat pump system may be a cheaper option than a new furnace or boiler for about 43% of households. But a higher-performing heat pump is almost always more expensive, costing an extra $8,000 to $13,000 before government subsidies (more on them later). That alone might keep heat pumps out of reach for many households.
Next, there's the potential for bill savings — which is significant. Using state average electricity and gas rates in the winter of 2021 to 2022, the study found that 86% of households can save money on their utility bills by switching to a medium-efficiency heat pump, and a whopping 95% of households will see their bills go down if they install the highest efficiency system.
So in theory, if homeowners do have the extra cash to put down, there’s a chance they could make up for high up-front costs in bill savings over time. But how good a chance?
Putting this all together, the authors looked at what percentage of households that upgraded to heat pumps would see a positive cash flow, calculated as the “net present value,” from the initial investment. Here, the results were less rosy. In many cases, high up-front costs cancel out potential savings. For example, despite the near-certain bill savings from buying one of the most efficient heat pump models, only 21% of households would see an overall economic benefit from the switch.
Still, more than half of all homes would see a positive cash flow by switching to a cheaper, minimum-efficiency heat pump.
Distribution of energy bill savings, upgrade costs, and unsubsidized net present value, relative to a reference equipment replacement scenario, using energy prices from winter 2021 to 2022 Courtesy NREL / Wilson et al., Heat pumps for all? Distributions of the costs and benefits of residential air-source heat pumps in the United States, Joule (2024), https://doi.org/10.1016/j.joule.2024.01.022
These findings underscore the importance of bringing down the cost of more efficient heat pump models, which are out of reach for many Americans but can provide significant energy bill savings. The authors suggest that policymakers can help by deploying incentives more strategically and pursuing research on “lower-cost, higher performance, and easier to install equipment.” There also may be opportunities for bulk purchasing and aggregating installations across an apartment building or neighborhood.
When it comes to bill savings, the study found that those who have systems that run on propane, fuel oil, or electric resistance heaters will pretty much always lower their bills by switching to a heat pump, no matter how efficient it is. But those who use natural gas are far more likely to lower their bills if they can afford to switch to one of the pricier, better-performing heat pumps — which cuts into the value proposition.
The following maps show the percentage of homes in each state that would see a positive cash flow from switching to a heat pump, looking at those switching from natural gas, electric resistance, or fuel oil and propane, illustrating how the value proposition is most challenging for those using natural gas.
Percentage of homes that currently have air conditioning that will see a positive cash flow from switching to a heat pump from natural gas, electricity, and fuel oil and propane. Courtesy NREL / Wilson et al. 2024
The authors also note that fixed charges on natural gas bills can play a significant role in the economics of switching to a heat pump. Most natural gas utilities charge customers a fixed amount each month, regardless of how much gas they use. If a homeowner switches to heat pumps but continues using gas for cooking, they’ll still have to pay the full fee, which can be as high as $34 a month, whereas homes that fully electrify can avoid these fees.
The results I described in the previous two sections include homes both with and without existing air conditioning systems of some kind. (With the exception of the maps, which only consider homes that have air conditioning already.)
But since heat pumps provide both heating and cooling, the economics are actually quite different for those households who already have air conditioners versus those who don't. If a household already has A/C, heat pumps appear more favorable, because a family would be able to replace two systems — an air conditioner and a furnace — with just one. If there is no pre-existing air conditioner, the heat pump will not only have higher up-front costs, but it’s more likely to increase energy bills, since the family might start using the heat pump for cooling in addition to heating.
Here are the same maps included in the previous section, but looking just at homes that do not have air conditioning.
Percentage of homes that do not have air conditioning that will see a positive cash flow from switching to a heat pump. The first column is homes that currently use natural gas, the second column is those that us electricity, and the third is those that use fuel oil and propane. Courtesy NREL / Wilson et al. 2024
There are basically zero cases where a house with natural gas heating, and no A/C, will save by switching to a heat pump. However, that result doesn’t take into account the benefits of getting air conditioning for the first time.
“They didn't include the new value that someone has, especially in a warming world and a world with more heat waves, of now having an air conditioner in your home,” Kevin Kircher, an assistant professor of mechanical engineering at Purdue University, told me. “So if you add that in, I think the economics look better.”
None of the results in the previous sections take into account the various subsidies that states and the federal government offer for heat pumps. For example, the Inflation Reduction Act included a $2,000 tax credit for heat pumps and an additional $11,500 in rebates for low- and moderate-income households. Both will increase the percentage of households for whom the investment will pencil out.
The study also doesn’t take into account the potential for homes to use smart controls that optimize their systems, or the opportunity for households to participate in demand response programs which will pay them to turn down their thermostats by a few degrees when the grid is taxed. Kircher, the Purdue professor, recently published a study of a real-world house in a cold climate where smart controls reduced heating energy costs by 23-34%.
Finally, one big takeaway from the study was that the results are very sensitive to the price ratio between natural gas rates and electricity rates, and there are reasons to believe that may become more favorable. For example, as more renewable energy is deployed, electricity could become more affordable. Meanwhile, if the U.S. increases exports of liquified natural gas, the cost of domestic natural gas could go up. The study cites a 2022 survey of oil and gas executives which found that 69% expect ‘‘the age of inexpensive U.S. natural gas to end by year-end 2025.”
“Big modeling like this entails a lot of assumptions about the future that are really hard to pin down with any real precision,” said Kircher. “But I think there's cause for optimism there.”
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Ecolectro, a maker of electrolyzers, has a new manufacturing deal with Re:Build.
By all outward appearances, the green hydrogen industry is in a state of arrested development. The hype cycle of project announcements stemming from Biden-era policies crashed after those policies took too long to implement. A number of high profile clean hydrogen projects have fallen apart since the start of the year, and deep uncertainty remains about whether the Trump administration will go to bat for the industry or further cripple it.
The picture may not be as bleak as it seems, however. On Wednesday, the green hydrogen startup Ecolectro, which has been quietly developing its technology for more than a decade, came out with a new plan to bring the tech to market. The company announced a partnership with Re:Build Manufacturing, a sort of manufacturing incubator that helps startups optimize their products for U.S. fabrication, to build their first units, design their assembly lines, and eventually begin producing at a commercial scale in a Re:Build-owned factory.
“It is a lot for a startup to create a massive manufacturing facility that’s going to cost hundreds of millions of dollars when they’re pre-revenue,” Jon Gordon, Ecolectro’s chief commercial officer, told me. This contract manufacturing partnership with Re:Build is “massive,” he said, because it means Ecolectro doesn’t have to take on lots of debt to scale. (The companies did not disclose the size of the contract.)
The company expects to begin producing its first electrolyzer units — devices that split water into hydrogen and oxygen using electricity — at Re:Build’s industrial design and fabrication site in Rochester, New York, later this year. If all goes well, it will move production to Re:Build’s high-volume manufacturing facility in New Kensington, Pennsylvania next year.
The number one obstacle to scaling up the production and use of cleaner hydrogen, which could help cut emissions from fertilizer, aviation, steelmaking, and other heavy industries, is the high cost of producing it. Under the Biden administration, Congress passed a suite of policies designed to kick-start the industry, including an $8 billion grant program and a lucrative new tax credit. But Biden only got a small fraction of the grant money out the door, and did not finalize the rules for claiming the tax credit until January. Now, the Trump administration is considering terminating its agreements with some of the grant recipients, and Republicans in Congress might change or kill the tax credit.
Since the start of the year, a $500 million fuel plant in upstate New York, a $400 million manufacturing facility in Michigan, and a $500 million green steel factory in Mississippi, have been cancelled or indefinitely delayed.
The outlook is particularly bad for hydrogen made from water and electricity, often called “green” hydrogen, according to a recent BloombergNEF analysis. Trump’s tariffs could increase the cost of green hydrogen by 14%, or $1 per kilogram, based on tariff announcements as of April 8. More than 70% of the clean hydrogen volumes coming online between now and 2030 are what’s known as “blue” hydrogen, made using natural gas, with carbon capture to eliminate climate pollution. “Blue hydrogen has more demand than green hydrogen, not just because it’s cheaper to produce, but also because there’s a lot less uncertainty around it,” BloombergNEF analyst Payal Kaur said during a presentation at the research firm’s recent summit in New York City. Blue hydrogen companies can take advantage of a tax credit for carbon capture, which Congress is much less likely to scrap than the hydrogen tax credit.
Gordon is intimately familiar with hydrogen’s cost impediments. He came to Ecolectro after four years as co-founder of Universal Hydrogen, a startup building hydrogen-powered planes that shut down last summer after burning through its cash and failing to raise more. By the end, Gordon had become a hydrogen skeptic, he told me. The company had customers interested in its planes, but clean hydrogen fuel was too expensive at $15 to $20 per kilogram. It needed to come in under $2.50 to compete with jet fuel. “Regional aviation customers weren’t going to spend 10 times the ticket price just to fly zero emissions,” he said. “It wasn’t clear to me, and I don’t think it was clear to our prospective investors, how the cost of hydrogen was going to be reduced.” Now, he’s convinced that Ecolectro’s new chemistry is the answer.
Ecolectro started in a lab at Cornell University, where its cofounder and chief science officer Kristina Hugar was doing her PhD research. Hugar developed a new material, a polymer “anion exchange membrane,” that had potential to significantly lower the cost of electrolyzers. Many of the companies making electrolyzers use designs that require expensive and supply-constrained metals like iridium and titanium. Hugar’s membrane makes it possible to use low-cost nickel and steel instead.
The company’s “stack,” the sandwich of an anode, membrane, and cathode that makes up the core of the electrolyzer, costs at least 50% less than the “proton exchange membrane” versions on the market today, according to Gordon. In lab tests, it has achieved more than 70% efficiency, meaning that more than 70% of the electrical energy going into the system is converted into usable chemical energy stored in hydrogen. The industry average is around 61%, according to the Department of Energy.
In addition to using cheaper materials, the company is focused on building electrolyzers that customers can install on-site to eliminate the cost of transporting the fuel. Its first customer was Liberty New York Gas, a natural gas company in Massena, New York, which installed a small, 10-kilowatt electrolyzer in a shipping container directly outside its office as part of a pilot project. Like many natural gas companies, Liberty is testing blending small amounts of hydrogen into its system — in this case, directly into the heating systems it uses in the office building — to evaluate it as an option for lowering emissions across its customer base. The equipment draws electricity from the local electric grid, which, in that region, mostly comes from low-cost hydroelectric power plants.
Taking into account the expected manufacturing cost for a commercial-scale electrolyzer, Ecolectro says that a project paying the same low price for water and power as Liberty would be able to produce hydrogen for less than $2.50 per kilogram — even without subsidies. Through its partnership with Re:Build, the company will produce electrolyzers in the 250- to 500-kilowatt range, as well as in the 1- to 5-megawatt range. It will be announcing a larger 250-kilowatt pilot project later this year, Gordon said.
All of this sounded promising, but what I really wanted to know is who Ecolectro thought its customers were going to be. Demand for clean hydrogen, or the lack thereof, is perhaps the biggest challenge the industry faces to scaling, after cost. Of the roughly 13 million to 15 million tons of clean hydrogen production announced to come online between now and 2030, companies only have offtake agreements for about 2.5 million tons, according to Kaur of BNEF. Most of those agreements are also non-binding, meaning they may not even happen.
Gordon tied companies’ struggle with offtake to their business models of building big, expensive, facilities in remote areas, meaning the hydrogen has to be transported long distances to customers. He said that when he was with Universal Hydrogen, he tried negotiating offtake agreements with some of these big projects, but they were asking customers to commit to 20-year contracts — and to figure out the delivery on their own.
“Right now, where we see the industry is that people want less hydrogen than that,” he said. “So we make it much easier for the customer to adopt by leasing them this unit. They don’t have to pay some enormous capex, and then it’s on site and it’s producing a fair amount of hydrogen for them to engage in pilot studies of blending, or refining, or whatever they’re going to use it for.”
He expects most of the demand to come from industrial customers that already use hydrogen, like fertilizer companies and refineries, that want to switch to a cleaner version of the fuel, or hydrogen-curious companies that want to experiment with blending it into their natural gas burners to reduce their emissions. Demand will also be geographically-limited to places like New York, Washington State, and Texas, that have low-cost electricity available, he said. “I think the opportunity is big, and it’s here, but only if you’re using a product like ours.”
On coal mines, Energy Star, and the EV tax credit
Current conditions: Storms continue to roll through North Texas today, where a home caught fire from a lightning strike earlier this week • Warm, dry days ahead may hinder hotshot crews’ attempts to contain the 1,500-acre Sawlog fire, burning about 40 miles west of Butte, Montana• Severe thunderstorms could move through Rome today on the first day of the papal conclave.
The International Energy Agency published its annual Global Methane Tracker report on Wednesday morning, finding that over 120 million tons of the potent greenhouse gas were emitted by oil, gas, and coal in 2024, close to the record high in 2019. In particular, the research found that coal mines were the second-largest energy sector methane emitter after oil, at 40 million tons — about equivalent to India’s annual carbon dioxide emissions. Abandoned coal mines alone emitted nearly 5 million tons of methane, more than abandoned oil and gas wells at 3 million tons.
“Coal, one of the biggest methane culprits, is still being ignored,” Sabina Assan, the methane analyst at the energy think tank Ember, said in a statement. “There are cost-effective technologies available today, so this is a low-hanging fruit of tackling methane.” Per the IEA report, about 70% of all annual methane emissions from the energy sector “could be avoided with existing technologies,” and “a significant share of abatement measures could pay for themselves within a year.” Around 35 million tons of total methane emissions from fossil fuels “could be avoided at no net cost, based on average energy prices in 2024,” the report goes on. Read the full findings here.
Opportunities to reduce methane emissions in the energy sector, 2024
IEA
The Environmental Protection Agency told staff this week that the division that oversees the Energy Star efficiency certification program for home appliances will be eliminated as part of the Trump administration’s ongoing cuts and reorganization, The Washington Post reports. The Energy Star program, which was created under President George H.W. Bush, has, in the past three decades, helped Americans save more than $500 billion in energy costs by directing them to more efficient appliances, as well as prevented an estimated 4 billion metric tons of greenhouse gas from entering the atmosphere since 1992, according to the government’s numbers. Almost 90% of Americans recognize its blue logo on sight, per The New York Times.
President Trump, however, has taken a personal interest in what he believes are poorly performing shower heads, dishwashers, and other appliances (although, as we’ve fact-checked here at Heatmap, many of his opinions on the issue are outdated or misplaced). In a letter on Tuesday, a large coalition of industry groups including the Air-Conditioning, Heating, and Refrigeration Institute, the Association of Home Appliance Manufacturers, and the U.S. Chamber of Commerce wrote to EPA Administrator Lee Zeldin in defense of Energy Star, arguing it is “an example of an effective non-regulatory program and partnership between the government and the private sector. Eliminating it will not serve the American people.”
House Speaker Mike Johnson suggested that the electric vehicle tax credit may be on its last legs, according to an interview he gave Bloomberg on Tuesday. “I think there is a better chance we kill it than save it,” Johnson said. “But we’ll see how it comes out.” He estimated that House Republicans would reveal their plan for the tax credits later this week. Still, as Bloomberg notes, a potential hangup may be that “many EV factories have been built or are under construction in GOP districts.”
As we’ve covered at Heatmap, President Trump flirted with ending the $7,500 tax credit for EVs throughout his campaign, a move that would mark “a significant setback to the American auto industry’s attempts to make the transition to electric vehicles,” my colleague Robinson Meyer writes. That holds true for all EV makers, including Tesla, the world’s most valuable auto company. However, its CEO, Elon Musk — who holds an influential position within the government — has said he supports the end of the tax credit “because Tesla has more experience building EVs than any other company, [and] it would suffer least from the subsidy’s disappearance.”
Constellation Energy Corp. held its quarterly earnings call on Tuesday, announcing that its operating revenue rose more than 10% in the first three months of the year compared to 2024, beating expectations. Shares climbed 12% after the call, with Chief Executive Officer Joe Dominguez confirming that Constellation’s pending purchase of natural gas and geothermal energy firm Calpine is on track to be completed by the end of the year, and that the nuclear power utility is “working hard to meet the power needs of customers nationwide, including powering the new AI products that Americans increasingly are using in their daily lives and that businesses and government are using to provide better products and services.”
But as my colleague Matthew Zeitlin reported, Dominguez also threw some “lukewarm water on the most aggressive load growth projections,” telling investors that “it’s not hard to conclude that the headlines are inflated.” As Matthew points out, Dominguez also has some reason to downplay expectations, including that “there needs to be massive investment in new power plants,” which could affect the value of Constellation’s existing generation fleet.
The Rockefeller Foundation aims to phase out 60 coal-fired power plants by 2030 by using revenue from carbon credits to cover the costs of closures, the Financial Times reports. The team working on the initiative has identified 1,000 plants in developing countries that would be eligible for the program under its methodology.
Rob and Jesse go deep on the electricity machine.
Last week, more than 50 million people across mainland Spain and Portugal suffered a blackout that lasted more than 10 hours and shuttered stores, halted trains, and dealt more than $1 billion in economic damage. At least eight deaths have been attributed to the power outage.
Almost immediately, some commentators blamed the blackout on the large share of renewables on the Iberian peninsula’s power grid. Are they right? How does the number of big, heavy, spinning objects on the grid affect grid operators’ ability to keep the lights on?
On this week’s episode of Shift Key, Jesse and Rob dive into what may have caused the Iberian blackout — as well as how grid operators manage supply and demand, voltage and frequency, and renewables and thermal resources, and operate the continent-spanning machine that is the power grid. Shift Key is hosted by Robinson Meyer, the founding executive editor of Heatmap, and Jesse Jenkins, a professor of energy systems engineering at Princeton University.
Subscribe to “Shift Key” and find this episode on Apple Podcasts, Spotify, Amazon, or wherever you get your podcasts.
You can also add the show’s RSS feed to your podcast app to follow us directly.
Here is an excerpt from our conversation:
Robinson Meyer: So a number of people started saying, oh, this was actually caused because there wasn’t enough inertia on the grid — that Spain kind of flew too close to the sun, let’s say, and had too many instantaneous resources that are metered by inverters and not by these large mechanical generators attached to its grid. Some issue happened and it wasn’t able to maintain the frequency of its grid as needed. How likely do you think that is?
Jesse Jenkins: So I don’t think it’s plausible as the precipitating event, the initial thing that started to drive the grid towards collapse. I would say it did contribute once the Iberian grid disconnected from France.
So let me break that down: When Spain and Portugal are connected to the rest of the continental European grid, there’s an enormous amount of inertia in that system because it doesn’t actually matter what’s going on just in Spain. They’re connected to this continen- scale grid, and so as the frequency drops there, it drops a little bit in France, and it drops a little bit in Latvia and all the generators across Europe are contributing to that balance. So there was a surplus of inertia across Europe at the time.
Once the system in Iberia disconnected from France, though, now it’s operating on its own as an actual island, and there it has very little inertia because the system operator only scheduled a couple thousand megawatts of conventional thermal units of gas power plants and nuclear. And so it had a very high penetration on the peninsula of non-inertia-based resources like solar and wind. And so whatever is happening up to that point, once the grid disconnected, it certainly lacked enough inertia to recover at that point from the kind of cascading events. But it doesn’t seem like a lack of inertia contributed to the initial precipitating event.
Something — we don’t know what yet — caused two generators to simultaneously disconnect. And we know that we’ve observed oscillation in the frequency, meaning something happened to disturb the frequency in Spain before all this happened. And we don’t know exactly what that disturbance was.
There could have been a lot of different things. It could have been a sudden surge of wind or solar generation. That’s possible. It could have been something going wrong with the control system that manages the automatic response to changes in frequency — they were measuring the wrong thing, and they started to speed up or slow down, or something went wrong. That happened in the past, in the case of a generator in Florida that turned on and tried to synchronize with the grid and got its controls wrong, and that causes caused oscillations of the frequency that propagated all through the Eastern Interconnection — as far away as North Dakota, which is like 2,000 miles away, you know? So these things happen. Sometimes thermal generators screw up.
Music for Shift Key is by Adam Kromelow.