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Heat pumps are cool. Neighborhood geothermal might be cooler.
A landmark project with major implications for how Americans could cleanly heat and cool their homes broke ground in Framingham, Massachusetts, on Monday.
Eversource, the largest gas and electric utility in New England, began construction on its first “networked geothermal” system. The company will connect 32 residential and five commercial buildings in a single neighborhood to underground water pipes, which will draw on the steady temperature of the ground beneath the earth’s surface to air condition and heat the buildings without fossil fuels.
Clean energy advocates across the country are looking to the demonstration as a test of the idea that natural gas utilities can remain in business in a decarbonized world by managing a network of pipes filled with water instead of climate-warming gas.
“I would say it's not just being watched nationally, it's being watched globally,” Zeyneb Magavi, the co-executive director of the Massachusetts-based clean energy nonprofit HEET, told me. Magavi and her partner, Audrey Schulman, dreamed up the idea of transforming gas utilities into geothermal utilities several years ago, and were instrumental in getting Eversource to consider the project.
“If they succeed enough, and I have no doubt they will, they're gonna be the founding install of a new utility that's going to be the foundation of our future energy system,” she said. “It's not that often that you get to give birth to a new utility.”
Geothermal heating systems have been around for nearly a century, and are known for being incredibly efficient. You may have heard of air-source heat pumps, commonly referred to simply as heat pumps, which function like an air conditioner in the summer and a furnace in the winter by transferring heat inside and outside the building. Geothermal heat pumps work similarly, but they use the ground as a source and sink for heat, rather than the ambient air. (They are different, but related to geothermal power plants, which tap into much hotter reservoirs underground to generate electricity.) Since the ground is a more stable temperature than the air, geothermal heat pumps require less energy. Networked geothermal systems have the potential to reduce energy use even more.
Many individual homes and buildings run on geothermal heating systems today, but all the drilling and piping translates into big upfront costs. Magavi told me the spark of HEET’s idea for a neighborhood-wide system dates back to 2008, when she wanted to install geothermal at her own home, but couldn’t afford it. Later, when she joined HEET and began thinking about what a future without gas could look like, she and Schulman discovered geothermal projects elsewhere in the country, such as a small town in Iowa, and a college campus in Colorado, where multiple buildings were linked to the same pipes. The systems didn’t seem all that different from the gas distribution networks they were looking to replace.
The project in Framingham involves building a new set of pipelines alongside the gas system. Each participating building will get a service pipe connecting it to a main horizontal line that runs through the neighborhood, which is in turn connected to a series of vertical lines that go about 500 feet deep. Water runs through the system, bringing heat up from the ground and delivering it to heat pumps inside the buildings in the winter, or absorbing heat from the homes and dumping it back underground in the summer.
Illustration of a networked geothermal systemAnara Magavi/HEET
The whole system is expected to be up and running by the fall. Eversource estimates the project will cost $14.7 million, and has received approval from regulators to pay for it with ratepayer funds, spread across its entire customer base. Participants will not pay any additional fees on top of the cost to run the heat pump equipment on their electricity bill. They will retain their existing heating and cooling systems, and will have the option to go back to them after the two-year pilot period.
Residents could see a 20% reduction in energy costs, according to Eversource, and around a 60% decrease in carbon emissions, taking into account the current electricity supply. The company will be gathering data throughout the pilot to confirm the actual cost, energy, and carbon savings of the project. “We also want to make a strong business case for why this should be done by the utility and why it makes sense for us to be building out systems like this,” said Eric Bosworth, the senior program manager for clean technologies at Eversource.
Magavi and Schulman see networked geothermal as an elegant solution to one of the biggest challenges of tackling climate change: avoiding what’s known as the utility death-spiral. If people begin swapping out their natural gas heaters for electric heat pumps, they will drive up costs for remaining gas customers, which will motivate more people to go electric, and inflate gas bills even more.
Geothermal presents a path for utilities to retain their customers. They already have the expertise to build and manage underground pipelines and heating equipment. And Magavi argues that if utilities take on the up front costs, it would give people more equitable access to clean energy. “You can just sign up with the utility — you don't have to have upfront capital, knowledge, or time,” she said. “That equity of access is something that is necessary for a just transition.”
If geothermal heating and cooling were to really take off, it could also help with another major climate challenge — the electric grid. The switch to electric vehicles and heat pumps is going to require a massive expansion of clean electricity resources and transmission and distribution wires. Widespread adoption of geothermal heat pumps could minimize that buildout. Boswoth told me that geothermal networks could be strategically deployed in areas that are electrically constrained.
Many climate advocates also like the idea because it presents a clear transition opportunity for natural gas workers, like those in the Plumbers and Pipefitters Union that build and maintain gas pipelines. “Networked geothermal systems could be a promising option for providing high road job opportunities to these workers,” Jenna Tatum of the Building Electrification Institute told me.
But that’s one aspect of the promise of networked geothermal that the Framingham project won’t be demonstrating. Eversource hired a third party construction company and hasn’t entered an agreement with any unions yet, although Bosworth said the company was actively engaged with the Pipefitters Union regarding longer-term geothermal plans.
The pilot in Framingham will be the first networked geothermal system operated by a utility, but it definitely won’t be the last. Massachusetts regulators have approved a handful of additional networked geothermal projects to be owned and operated by Eversource and another gas utility, National Grid. New York State is also moving forward on a number of utility-owned pilots. Several other states, like Minnesota, have also passed laws that encourage gas utilities to pursue geothermal.
“We expect that we're going to see a pretty significant pilot proposal in [utility] plans modeled after the work that's been done out East,” Joe Dammel, managing director of buildings for Fresh Energy, a Minnesota-based clean energy nonprofit, told me.
One challenge that’s come up as the idea has taken off is that no one can seem to agree about what it should be called. While the term is “networked geothermal” in Massachusetts, New York is using “thermal energy network.” Magavi said it’s also been referred to as “community geothermal,” a “thermal highway,” an ATL or “ambient temperature loop,” a “heatnet” and a “5G” network. All of this is further complicated by the fact that the terms “geothermal energy,” “heat pumps,” and “district energy,” can all refer to fundamentally different technologies.
“It’s a nightmare,” she told me. She said she’s initiated a campaign with the National Renewable Energy Laboratory and the Department of Energy to set language standards. “There’s a survey currently going out to everyone to ask them what they think about all the different names.”
The Framingham pilot could be significantly expanded if all goes well. HEET collaborated with Eversource to apply for funding from the Department of Energy for a second networked geothermal system in the city that would be connected to the first one, and was recently awarded a $717,000 grant.
Advocates like Magavi hope these projects will turn into a full-on transition strategy for utilities to move away from a business model based on gas or other fuels. At the groundbreaking on Monday, Eversource chairman, president, and CEO Joe Nolan made a bold statement that seemed to support that notion. “As we transition to a carbon-free future, this is going to be the answer for everybody,” he said. “And it’s all starting right here.”
But when I talked to Bosworth, he qualified that at this point the company sees geothermal as one “tool in the proverbial toolbelt.” Like many utilities, Eversource is also exploring the potential to deliver lower-carbon fuels like biogas and hydrogen through its gas lines.
“We want to take a look at any and all potential pathways and really vet them for what is viable, and what works where,” Bosworth told me. “We will use a combined approach to get to our carbon neutrality goals.”
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Amarillo-area residents successfully beat back a $600 million project from Xcel Energy that would have provided useful tax revenue.
Power giant Xcel Energy just suffered a major public relations flap in the Texas Panhandle, scrubbing plans for a solar project amidst harsh backlash from local residents.
On Friday, Xcel Energy withdrew plans to build a $600 million solar project right outside of Rolling Hills, a small, relatively isolated residential neighborhood just north of the city of Amarillo, Texas. The project was part of several solar farms it had proposed to the Texas Public Utilities Commission to meet the load growth created by the state’s AI data center boom. As we’ve covered in The Fight, Texas should’ve been an easier place to do this, and there were few if any legal obstacles standing in the way of the project, dubbed Oneida 2. It was sited on private lands, and Texas counties lack the sort of authority to veto projects you’re used to seeing in, say, Ohio or California.
But a full-on revolt from homeowners and realtors apparently created a public relations crisis.
Mere weeks ago, shortly after word of the project made its way through the small community that is Rolling Hills, more than 60 complaints were filed to the Texas Public Utilities Commission in protest. When Xcel organized a public forum to try and educate the public about the project’s potential benefits, at least 150 residents turned out, overwhelmingly to oppose its construction. This led the Minnesota-based power company to say it would scrap the project entirely.
Xcel has tried to put a happy face on the situation. “We are grateful that so many people from the Rolling Hills neighborhood shared their concerns about this project because it gives us an opportunity to better serve our communities,” the company said in a statement to me. “Moving forward, we will ask for regulatory approval to build more generation sources to meet the needs of our growing economy, but we are taking the lessons from this project seriously.”
But what lessons, exactly, could Xcel have learned? What seems to have happened is that it simply tried to put a solar project in the wrong place, prizing convenience and proximity to an existing electrical grid over the risk of backlash in an area with a conservative, older population that is resistant to change.
Just ask John Coffee, one of the commissioners for Potter County, which includes Amarillo, Rolling Hills, and a lot of characteristically barren Texas landscape. As he told me over the phone this week, this solar farm would’ve been the first utility-scale project in the county. For years, he said, renewable energy developers have explored potentially building a project in the area. He’s entertained those conversations for two big reasons – the potential tax revenue benefits he’s seen elsewhere in Texas; and because ordinarily, a project like Oneida 2 would’ve been welcomed in any of the pockets of brush and plain where people don’t actually live.
“We’re struggling with tax rates and increases and stuff. In the proper location, it would be well-received,” he told me. “The issue is, it’s right next to a residential area.”
Indeed, Oneida 2 would’ve been smack dab up against Rolling Hills, occupying what project maps show would be the land surrounding the neighborhood’s southeast perimeter – truly the sort of encompassing adjacency that anti-solar advocates like to describe as a bogeyman.
Cotton also told me he wasn’t notified about the project’s existence until a few weeks ago, at the same time resident complaints began to reach a fever pitch. He recalled hearing from homeowners who were worried that they’d no longer be able to sell their properties. When I asked him if there was any data backing up the solar farm’s potential damage to home prices, he said he didn’t have hard numbers, but that the concerns he heard directly from the head of Amarillo’s Realtors Association should be evidence enough.
Many of the complaints against Oneida 2 were the sort of stuff we’re used to at The Fight, including fears of fires and stormwater runoff. But Cotton said it really boiled down to property values – and the likelihood that the solar farm would change the cultural fabric in Rolling Hills.
“This is a rural area. There are about 300 homes out there. Everybody sitting out there has half an acre, an acre, two acres, and they like to enjoy the quiet, look out their windows and doors, and see some distance,” he said.
Ironically, Cotton opposed the project on the urging of his constituents, but is now publicly asking Xcel to continue to develop solar in the county. “Hopefully they’ll look at other areas in Potter County,” he told me, adding that at least one resident has already come to him with potential properties the company could acquire. “We could really use the tax money from it. But you just can’t harm a community for tax dollars. That’s not what I’m about.”
I asked Xcel how all this happened and what their plans are next. A spokesperson repeatedly denied my requests to discuss Oneida 2 in any capacity. In a statement, the company told me it “will provide updates if the project is moved to another site,” and that “the company will continue to evaluate whether there is another location within Potter County, or elsewhere, to locate the solar project.”
Meanwhile, Amarillo may be about to welcome data center development because of course, and there’s speculation the first AI Stargate facility may be sited near Amarillo, as well.
City officials will decide in the coming weeks on whether to finalize a key water agreement with a 5,600-acre private “hypergrid” project from Fermi America, a new company cofounded by former Texas governor Rick Perry, says will provide upwards of 11 gigawatts to help fuel artificial intelligence services. Fermi claims that at least 1 gigawatt of power will be available by the end of next year – a lot of power.
The company promises that its “hypergrid” AI campus will use on-site gas and nuclear generation, as well as contracted gas and solar capacity. One thing’s for sure – it definitely won’t be benefiting from a large solar farm nearby anytime soon.
And more of the most important news about renewable projects fighting it out this week.
1. Racine County, Wisconsin – Microsoft is scrapping plans for a data center after fierce opposition from a host community in Wisconsin.
2. Rockingham County, Virginia – Another day, another chokepoint in Dominion Energy’s effort to build more solar energy to power surging load growth in the state, this time in the quaint town of Timberville.
3. Clark County, Ohio – This county is one step closer to its first utility-scale solar project, despite the local government restricting development of new projects.
4. Coles County, Illinois – Speaking of good news, this county reaffirmed the special use permit for Earthrise Energy’s Glacier Moraine solar project, rebuffing loud criticisms from surrounding households.
5. Lee County, Mississippi – It’s full steam ahead for the Jugfork solar project in Mississippi, a Competitive Power Ventures proposal that is expected to feed electricity to the Tennessee Valley Authority.
A conversation with Enchanted Rock’s Joel Yu.
This week’s chat was with Joel Yu, senior vice president for policy and external affairs at the data center micro-grid services company Enchanted Rock. Now, Enchanted Rock does work I usually don’t elevate in The Fight – gas-power tracking – but I wanted to talk to him about how conflicts over renewable energy are affecting his business, too. You see, when you talk to solar or wind developers about the potential downsides in this difficult economic environment, they’re willing to be candid … but only to a certain extent. As I expected, someone like Yu who is separated enough from the heartburn that is the Trump administration’s anti-renewables agenda was able to give me a sober truth: Land use and conflicts over siting are going to advantage fossil fuels in at least some cases.
The following conversation was lightly edited for clarity.
Help me understand where, from your perspective, the generation for new data centers is going to come from. I know there are gas turbine shortages, but also that solar and wind are dealing with headwinds in the United States given cuts to the Inflation Reduction Act.
There are a lot of stories out there about certain technologies coming out to the forefront to solve the problem, whether it’s gas generation or something else. But the scale and the scope of this stuff … I don’t think there is a silver bullet where it’s all going to come from one place.
The Energy Department put out a request for information looking for ways to get to 3 gigawatts quickly, but I don’t think there is any way to do that quickly in the United States. It’s going to take work from generation developers, batteries, thermal generation, emerging storage technologies, and transmission. Reality is, whether it is supply chain issues or technology readiness or the grid’s readiness to accept that load generation profile, none of it is ready. We need investment and innovation on all fronts.
How do conflicts over siting play into solving the data center power problem? Like, how much of the generation that we need for data center development is being held back by those fights?
I do have an intuitive sense that the local siting and permitting concerns around data centers are expanding in scope from the normal noise and water considerations to include impacts to energy affordability and reliability, as well as the selection of certain generation technologies. We’ve seen diesel generation, for example, come into the spotlight. It’s had to do with data center permitting in certain jurisdictions, in places like Maryland and Minnesota. Folks are realizing that a data center comes with a big power plant – their diesel generation. When other power sources fall short, they’ll rely on their diesel more frequently, so folks are raising red flags there. Then, with respect to gas turbines or large cycle units, there’s concerns about viewsheds, noise and cooling requirements, on top of water usage.
How many data center projects are getting their generation on-site versus through the grid today?
Very few are using on-site generation today. There’s a lot of talk about it and interest, but in order to serve our traditional cloud services data center or AI-type loads, they’re looking for really high availability rates. That’s really costly and really difficult to do if you’re off the grid and being serviced by on-site generation.
In the context of policy discussions, co-location has primarily meant baseload resources on sites that are serving the data centers 24/7 – the big stories behind Three Mile Island and the Susquehanna nuclear plant. But to be fair, most data centers operational today have on-site generation. That’s their diesel backup, what backstops the grid reliability.
I think where you’re seeing innovation is modular gas storage technologies and battery storage technologies that try to come in and take the space of the diesel generation that is the standard today, increasing the capability of data centers in terms of on-site power relative to status quo. Renewable power for data centers at scale – talking about hundreds of megawatts at a time – I think land is constraining.
If a data center is looking to scale up and play a balancing act of competing capacity versus land for energy production, the competing capacity is extremely valuable. They’re going to prioritize that first and pack as much as they can into whatever land they have to develop. Data centers trying to procure zero-carbon energy are primarily focused on getting that energy over wires. Grid connection, transmission service for large-scale renewables that can match the scale of natural gas, there’s still very strong demand to stay connected to the grid for reliability and sustainability.
Have you seen the state of conflict around renewable energy development impact data center development?
Not necessarily. There is an opportunity for data center development to coincide with renewable project development from a siting perspective, if they’re going to be co-located or near to each other in remote areas. For some of these multi-gigawatt data centers, the reason they’re out in the middle of nowhere is a combination of favorable permitting and siting conditions for thousands of acres of data center building, substations and transmission –
Sorry, but even for projects not siting generation, if megawatts – if not gigawatts – are held up from coming to the grid over local conflicts, do you think that’s going to impact data center development at all? The affordability conversions? The environmental ones?
Oh yeah, I think so. In the big picture, the concern is if you can integrate large loads reliably and affordably. Governors, state lawmakers are thinking about this, and it’s bubbling up to the federal level. You need a broad set of resources on the grid to provide that adequacy. To the extent you hold up any grid resources, renewable or otherwise, you’re going to be staring down some serious challenges in serving the load. Virginia’s a good example, where local groups have held up large-scale renewable projects in the state, and Dominion’s trying to build a gas peaker plant that’s being debated, too. But in the meantime, it is Data Center Alley, and there are gigawatts of data centers that continue to want to get in and get online as quickly as possible. But the resources to serve that load are not coming online in time.
The push toward co-location probably does favor thermal generation and battery storage technologies over straight renewable energy resources. But a battery can’t cover 24/7 use cases for a data center, and neither will our unit. We’re positioned to be a bridge resource for 24/7 use for a few years until they can get more power to the market, and then we can be a flexible backup resource – not a replacement for the large-scale and transmission-connected baseload power resources, like solar and wind. Texas has benefited from huge deployments of solar and wind. That has trickled down to lower electricity costs. Those resources can’t do it alone, and there’s thermal to balance the system, but you need it all to meet the load growth.