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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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On GM eating the tariffs, California’s utility bills, and open-sourcing climate models
Current conditions: U.S. government forecasters are projecting hurricane season to ramp up in the coming weeks, with as many as nine tropical storms forming in the Caribbean by November • Southern Arizona is facing temperatures of up to 114 degrees Fahrenheit • Northeast India is experiencing extremely heavy rainfall of more than 8 inches in 24 hours.
Secretary of Energy Chris Wright said his agency is preparing to rewrite previously published National Climate Assessments, which have already been removed from government websites. In an interview with CNN’s Kaitlan Collins, Wright said the analyses “weren’t fair in broad-based assessments of climate change.” He added: “We’re reviewing them, and we will come out with updated reports on those and with comments on those reports.”
The former chief executive of the fracking company Liberty Energy, Wright once eschewed the outright rejection of climate science that other Trump administration officials espouse. But as the Environmental Protection Agency works to withdraw the legal finding that gave the federal government the right to regulate planet-heating emissions under the Clean Air Act, Wright has ratcheted up his rhetoric. Earlier this week, he claimed that “ceaseless repeating from the media, politicians and activists claiming that climate change is making weather more dangerous and severe is just nonsense.” In response, my colleague Robinson Meyer noted on X: “This is a new and big turn from Secretary Wright. I’ve been pretty careful to never call him a climate change denier because while his claims about the science have been incredibly opinionated, I could see the ‘true’ thing he was trying to say. But this is just brazenly wrong.”
Days after the Department of the Interior revoked a designation opening millions of acres off the United States’ shores to offshore wind, the agency on Thursday launched “a full review of offshore wind energy regulations to ensure alignment” with “America’s energy priorities under President Donald J. Trump.” The review aims to examine “financial assurance requirements and decommissioning cost estimates for offshore wind projects, to ensure federal regulations do not provide preferential treatment to unreliable, foreign-controlled energy sources over dependable, American-made energy,” according to the press release announcing the move.
This is just the latest in a series of actions the administration has taken targeting renewables, particularly wind. For more on Trump’s all-out war against America's biggest source of non-emitting energy, here’s my colleague Jael Holzman.
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The Chevrolet Bolt.Bill Pugliano/Getty Images
General Motors is preparing to import batteries from Chinese giant CATL despite steep tariffs imposed by Trump. The automaker is buying the batteries to power the second-generation Chevrolet Bolt electric vehicle, in what The Wall Street Journal described as “a supply-chain Band-Aid for a company that touts extensive investments in U.S. battery manufacturing.”
The imports are meant to hold GM over for two years until the Detroit giant and its Korean partner LG Energy Solution can complete work on U.S. manufacturing sites to provide a domestic source of lower-cost batteries, according to Journal reporter Christopher Otts. GM’s EV sales surged in July following the introduction of the electric version of the popular Chevrolet Equinox SUV, in one of the brightest spots for the American EV market this summer.
California lawmakers are proposing a radical solution to curb rising electricity rates. Bills moving through the state’s legislature would use money raised from state bonds to help pay for the hugely expensive process of expanding the power grid and upgrading its equipment to better withstand wildfires, Canary Media’s Jeff St. John reported. The legislation would force the state’s big three utilities to accept public financing for a portion of the tens of billions of dollars they plan to spend on the power lines. The proposals come as steep rate hikes across the country become a political hot button ahead of next year’s midterm elections. As Robinson put it, “when you look across the power system, virtually every trend is setting us up for electricity price spikes.”
The sustainability data company Watershed announced a new partnership this morning with the Stanford Sustainable Solutions Lab to preserve the EPA’s model for carbon accounting. Dubbed “Cornerstone,” the project “will be a hub for open access” to software designed to assess Scope 3 emissions, the planet-heating pollution that comes from indirect downstream activities in a supply chain. “By combining the most trusted environmental data models and keeping them open to the world, we hope to help companies and organizations build and maintain momentum on sustainability,” Watershed’s co-founder Christian Anderson said in a statement. Wesley Ingwersen, the former EPA lead and architect behind the federal model, will serve as the initiative’s technical director.
The British government’s decision in May to hand back sovereignty over the Chagos Island to Mauritius more than two centuries after seizing the Indian Ocean archipelago and forcing out its residents to make way for a military base created a political uproar in the United Kingdom earlier this year. But British rule over the island chain yielded at least one major benefit beyond military defense. A new study found that the supersized Marine Protected Area the U.K. established in 2010 protected large ocean animals throughout much of their lifecycle. Scientists tracked sea turtles, manta rays and seabirds in the nearly 250,000-square-mile sanctuary. In total, 95% of tracking locations showed the area “is large enough to protect these wandering animals” which travel far to forage, breed and migrate. By contrast, the study from Exeter and Heriot-Watt universities found that seabirds in marine areas with smaller than 40,000 square miles “would be less well protected.”
Congressional Democrats will have to trust the administration to allow renewables projects through. That may be too big an ask.
How do you do a bipartisan permitting deal if the Republicans running the government don’t want to permit anything Democrats like?
The typical model for a run at permitting reform is that a handful of Republicans and Democrats come together and draw up a plan that would benefit renewable developers, transmission developers, and the fossil fuel industry by placing some kind of limit on the scope and extent of federally-mandated environmental reviews. Last year’s Energy Permitting Reform Act, for instance, co-sponsored by Republican John Barrasso and Independent Joe Manchin, included time limits on environmental reviews, mandatory oil and gas lease sales, siting authority for interstate transmission, and legal clarity for mining projects. That passed through the Senate Energy and Natural Resources Committee but got no further.
During a House hearing in July, California Representative Scott Peters, a Democrat, bragged that a bill he’d introduced with Republican Dusty Johnson to help digitize permitting had won support from both the Natural Resources Defense Council and the American Petroleum Institute — two advocacy groups not typically speaking in harmony. (He’s not the only one taking a crack at permitting reform, though: Another bipartisan House effort sponsored by House Natural Resources Committee chairman Bruce Westerman and moderate Maine Democrat Jared Golden would limit when National Environmental Policy Act-mandated reviews happen, install time limits for making claims, and restrict judicial oversight of the NEPA process.)
But unless Democrats trust the Trump administration to actually allow renewables projects to go forward, his proposal could be dead on arrival. Since the signing of the One Big Beautiful Bill Act on July 4, the executive branch has been on the warpath against renewables, especially wind. With the Trump administration’s blessing, OBBBA restricted tax credits for renewable projects, both by accelerating the phaseout timeline for the credits (projects have until July of next year to start construction, or until the end of 2027 to be placed in service) and by imposing harsh new restrictions on developers’ business relationships with China or Chinese companies. Mere days after he signed the final bill into law, Trump directed the Internal Revenue Service to write tougher guidance governing what it means to start construction, potentially narrowing the window to qualify still further.
“I think all of this fuzz coming out of the Trump administration makes trust among Democrats a lot harder to achieve,” Peters told me this week.
In recent weeks, Trump’s Department of the Interior has issued memos calling for political reviews of effectively all new renewables permits and instituting strict new land use requirements that will be all but impossible for wind developments to meet. His Department of Transportation, meanwhile, insinuated that the department under the previous administration had ignored safety concerns related to radio frequencies while instituting onerous new setback requirements for renewables development near roadways.
Peters acknowledged that bipartisan permitting reform may be a heavy lift for his fellow Democrats — “a lot of Democrats didn’t come to Congress to make permitting oil and gas easier,” he told me — but that considering the high proportion of planned projects that are non-emitting, it would still be worth it to make all projects move faster.
That said, he conceded that his argument “loses a lot of force” if none of those planned non-emitting projects that happen to be solar or wind can get their federal permits approved. “How can I even make a deal on energy unless I get some assurance that will be honored by the President?” Peters told me.
Other energy and climate experts broadly supportive of investment-led approaches to combatting climate change still think that Democrats should push on with a permitting deal.
“All of this raises the importance of a bipartisan Congressional permitting reform bill that contains executive branch discretion to deny routine permits for American energy resources,” Princeton professor and Heatmap contributor Jesse Jenkins posted on X. “Seems like there's a lot of reasons for both sides to ensure America's approach to siting energy resources doesn't keep ping-ponging back and forth every four years.”
But permitting reform supporters are aware of the awkward situation the president’s unilateral actions against renewables puts the whole enterprise in.
“The administration’s recent measures are suboptimal policy and no doubt worsen the odds of enacting a technology-neutral permitting reform deal,” Pavan Venkatakrishnan, an infrastructure fellow at the Institute for Progress, told me.
At the same time, he argued that Democrats should still try to seek a deal, pointing to the high demand for electrons of any type. Not even the Trump administration can entirely choke off demand for renewables, so permitting reform could still be worth doing to ensure that as much as can evade the administration’s booby traps can eventually get built.
“Projects remain at the mercy of a burdensome regulatory regime,” Venkatakrishnan said. “Democrats should remain committed to an ambitious permitting deal — the best way to reduce deployment timelines and costs for all technologies, including solar-and-storage.”
Venkatakrishnan also suggested that Democrats could, in a bipartisan deal, seek to roll back some of the executive branch actions, including the Interior memo subjecting wind and solar to heightened review or the executive order on the definition of “begin construction.” There would be a precedent for such an action — the 2024 Manchin-Barrasso permitting reform bill attempted to scrap the pause on liquified natural gas approvals that the Biden administration had implemented. But then of course, that didn’t ever become law. (Manchin and congressional Republicans were able to clear the way to permitting a specific project, the Mountain Valley Pipeline in a larger bipartisan deal.)
What could unlock a deal, Yogin Kothari, a former congressional staffer and the chief strategy officer of the SEMA Coalition, a domestic solar manufacturing group, told me, would be the Trump administration getting actively involved. “The administration is probably going to have to lead,” Kothari said. “It’s going to be up to folks in the administration to go to the Hill and say, We do need this, and this is what it’s going to mean, and we’re going to implement this in good faith.”
This would require a delicate balancing act — the Trump administration would have to think there’s enough in a deal for their favored energy and infrastructure projects to make it worth perhaps rolling back some of their anti-renewables campaign.
“The administration is going to have to convince Democrats that it’s not permitting reform just for a subset of industries,” i.e. oil, gas, and coal, “but it is really technology neutral permanent reform,” Kothari said. “On the Senate side, it comes down to whether seven Senate Democrats feel like they can trust the admin to actually implement things in a way that is helpful across the board for energy dominance.”
One reason the administration itself may have to make commitments is because Congressional Democrats may not trust Republicans to stand behind legislation they support and vote for, Peters told me.
“Obviously we’d have to get some face-to-face understanding that if we make a deal, they’re going to live by the deal,” he said.
Peters pointed to the handful of Republicans who successfully negotiated for a longer runway for renewable tax credits, only to see Trump move almost immediately to tighten up eligibility for those tax credits as reason enough for skepticism. He also cited the cuts to previously agreed-upon spending that the Trump administration pushed through Congress on a party line vote as evidence that existing law and deals aren’t necessarily stable in Trump’s Washington.
“If we do a deal — Republicans and Democrats in Congress, the House and Senate, get together and make an agreement — we have to have assurance that the President will back us,” Peters told me.
No bipartisan deal is ever easy to come by, but then historically, “everybody lives by it,” he said. “I think that may be changing under this administration, and I think it makes everything tougher.”
And more of the week’s most important conflicts around renewable energy.
1. Sussex County, Delaware – The Trump administration has confirmed it will revisit permitting decisions for the MarWin offshore wind project off the coast of Maryland, potentially putting the proposal in jeopardy unless blue states and the courts intervene.
2. Northwest Iowa – Locals fighting a wind project spanning multiple counties in northern Iowa are opposing legislation that purports to make renewable development easier in the state.
3. Pima County, Arizona – Down goes another solar-powered data center, this time in Arizona.
4. San Diego County, California – A battery storage developer has withdrawn plans to build in the southern California city of La Mesa amidst a broadening post-Moss Landing backlash over fire concerns.
5. Logan and McIntosh Counties, North Dakota – These days, it’s worth noting when a wind project even gets approved.
6. Hamilton County, Indiana – This county is now denying an Aypa battery storage facility north of Indianapolis despite growing power concerns in the region.