But they do not all have a clear path to success. Each one has already faced challenges, and many of them are likely to face a great number more. We call these the make-or-break energy projects because it's still unclear what the clean energy system of the future is going to look like, but the projects from this list are likely to play a big part in it — if, that is, they get there.
1. Easley
Heatmap Illustration/Getty Images
Type of project: Solar farm
Developer: Intersect Power
Location: Desert Center, Riverside County, California.
Size: 400 megawatts of generation and 650 megawatts of storage
Operation date: Possibly 2025
Cost: $990 million
Why it matters: Facing opposition from local retirees angered by the large number of projects popping up in the area, as well as from conservation-focused groups — such as Basin and Range Watch, which opposes many utility-scale energy projects in desert areas — Easley will be a test of whether California’s reforms to limit the timeframe of appeals to the state’s environmental reviews can actually work in getting a project approved and online faster.
The early signs are promising. A nearby solar project by the same developer, Intersect Power, recently went into operation after getting approved by the Bureau of Land Management in January 2022. Easley could be operational “as early as late 2025,” according to a Plan of Development prepared for Intersect Power.
Easley is also an example of what’s increasingly becoming standard in California, at both the residential and utility-scale level: pairing solar with storage. The California grid increasingly relies on batteries to keep the lights on as solar ramps up and down in the mornings and, especially, the evenings. The state has procured a massive amount of storage and has adjusted how utilities pay for rooftop solar in a way that encourages pairing battery systems with rooftop solar panels. This both stabilizes the grid and helps further decarbonize it, as batteries that are physically close to intermittent renewables are more likely to abate carbon emissions.
2. Cambridge Energy Storage Project
Heatmap Illustration/Form Energy
Type: Energy storage
Developer: Form Energy and Great River Energy
Location: Cambridge, Minnesota
Size: 150 megawatt hours
Operation date: End of 2025
Cost: Unknown; Goal of less than 1/10th cost of utility-scale lithium-ion batteries per megawatt hour
Why it matters: Form Energy first made waves in 2020 when it announced a contract with Great River Energy, a Minnesota electric utility, to build a battery that could store 100 hours’ worth of electricity, which was simply unheard of. Other energy storage companies were just trying to break the 4-hour limitation of lithium-ion, aiming for 8 hours or, at most, 12. Days-long energy storage would be a game changer for maintaining reliability during extreme weather events, storing renewable energy for stretches of cloudy days or windless nights or kicking in when demand peaks. At first, Form’s project was shrouded in mystery. How, exactly, would it do this? But a year later, the company revealed the secret chemistry behind its breakthrough: iron and oxygen. The batteries are filled with iron pellets that, when exposed to oxygen, rust, releasing electrons to the grid. They “charge” by running in reverse, using the electrical current from the grid to convert the rust back to iron.
Since then, the hype has continued to build. Form has raised nearly $1 billion from venture capital and been awarded tens of millions more ingovernment grants. It has signed contracts with six utilities to deploy projects in California, New York, Virginia, Georgia, and Colorado, in addition to Minnesota. All this, despite not having completed a single project yet.
The Great River Energy Project is set to be the first to come online. Originally, the company said it would be operating by the end of 2023; now it’s expected to start construction later this year and begin operating in early 2025, Vice President of Communications Sarah Bray told Heatmap. First, the company has to complete construction of its first factory in Weirton, West Virginia, where it will be producing all of the batteries. Bray said it expects to start high-volume production later this year.
3. SunZia Wind
Heatmap Illustration/Getty Images
Type: Onshore wind
Developer: Pattern Energy
Location: Lincoln, Torrance, and San Miguel Counties, New Mexico, with transmission into Arizona
Size: 3,500 megawatts
Operation date: 2026
Cost: The project’s developer, Pattern Energy, has secured $11 billion in financing for the wind and associated transmission project. The cost of the project is estimated to be $8 billion.
Why it matters: This would be the biggest wind project in the country and a test case for a variety of energy policy objectives at both the state and federal level. For California, it would be a key step in decarbonizing its grid, as the state right now imports a large amount of its power, not all of which is carbon-free. For the federal government, it meets several goals — using public lands for carbon-free energy development, plus long-distance transmission to spur energy development across the country and link clean power resources in rural areas to major load centers.
It would also mean an ambitious project could overcome long and concerted opposition. The project was first proposed in 2006, and its transmission line cleared environmental review back in 2015, but it has been mired in lawsuit after lawsuit. Most recently, a coalition of conservation groups and Indian tribes sued to halt construction on the power line portion of the project in Arizona’s San Pedro Valley, claiming that their cultural rights had not been adequately respected. In April, a judge allowed construction to continue, ruling that those claims were barred by the existing federal approvals, which had taken years to attain.
4. Empire Wind
Heatmap Illustration/Getty Images
Type: Offshore wind
Developer: Equinor
Location: South of Long Island, New York
Size: 810 megawatts
Operation date: 2026
Cost: Not available, but an earlier estimate for developing two wind farms was $3 billion. Costs have since risen, but the second farm, Empire Wind 2, is no longer under contract.
Why it matters: The Northeast, and especially New York State, have aggressive aims for decarbonization, with a goal of 70% of the state’s electricity coming from renewables by 2030. The Biden administration also has a specific goal for 30 gigawatts of offshore wind capacity by 2030, and New York has a goal of 9 gigawatts by 2035. These types of high-capacity projects will be essential for the Northeast to decarbonize. The windy coast of the Atlantic Ocean is the most potent large-scale renewable resource in the region, and many of the region’s large load centers, such as New York City and Boston, are on the coast.
Offshore wind, while expensive, can present less permitting hassle and local opposition than onshore wind or utility-scale solar. Empire Wind 1 (along with Sunrise Wind) matters tremendously for New York’s offshore wind program, which has been in development for years but has faced escalating costs and project cancellations. Only one offshore wind project is actually operational in the state, South Fork Wind, which was contracted outside the NYSERDA process and has around 130 megawatts of capacity. If Empire manages to get steel in the water and electrons flowing to the coast, it will be a sign that the Northeast’s — and thus the country’s — decarbonization goals are at least somewhat attainable.
5. Champlain Hudson Power Express
Heatmap Illustration/Getty Images
Type: Transmission
Developers: Transmission Developers, which is owned by the Blackstone Group
Size: 339 miles / 1,250 megawatts
Operation date: 2026
Cost: $6 billion
Why it matters: The Champlain Hudson Power Express, often referred to as CHPE (affectionately pronounced “chippy”) will deliver 1,250 megawatts of hydropower from Quebec into the New York City grid, which is currently about 90% powered by fossil fuels. It is “the most powerful project you’ll never see,” according to its developers, as it is the largest transmission line in the country to be installed entirely underground and underwater.
The project is essential to New York’s goal to build a zero-emission electricity system by 2040. The line will supply an always-available source of clean power to supplement intermittent wind and solar generation and maintain a reliable grid. It has already overcome a number of barriers, including nearly a decade of environmental reviews, uncertainty over whether New York would buy its power, and opposition from conservation advocates concerned about the negative impacts of hydroelectric dams on the environment and on Native communities in Canada.
When it begins operating, New Yorkers won’t just get cleaner power — they should also see air quality benefits almost immediately. The new line is expected to cut air pollution equivalent to that released by 15 of the city’s 16 fossil fuel-fired peaker plants.
6. Cape Station
Heatmap Illustration/Fervo
Developer: Fervo
Type: Geothermal
Location: Beaver County, Utah
Size: 400 megawatts
Operation date: 2026, although the project isn’t expected to be finished until 2028
Cost: Not disclosed, but Fervo raised $244 million and said that the cash “will support Fervo’s continued operations at Cape Station.”
Why it matters: This enhanced geothermal project is not the first one for Fervo. The company’s Nevada site, Project Red, began providing power for Google data centers in Nevada in November 2023. This planned site, however, will be far bigger: Fervo currently has authorization from the Bureau of Land Management for up to 29 exploratory wells, while the Project Red site had just two. Cape Station broke ground in September 2023, and in the first six months of drilling, Fervo said it reduced costs from drilling by 70% compared to its Project Red wells.
As the grid decarbonizes and major power consumers like technology companies insist on having clean power for their operations, there will be massive and growing demand for so-called “clean firm” power, carbon-free power that is available all the time. Conventional wind and solar is intermittent, and existing battery technology only allows for limited output over time. Fervo’s “enhanced geothermal” technology uses techniques borrowed from the oil and gas industry to be able to produce geothermal power essentially anywhere where there are hot enough rocks underneath the surface of the Earth, as opposed to conventional geothermal, which depends on locating hot enough fluid or stream.
If Fervo can demonstrate that it can produce power at scale at costs comparable to existing conventional geothermal projects, it can expect a massive market for it and demand for more projects.
7. Natrium Reactor
Heatmap Illustration/TerraPower
Type: Nuclear
Developer: TerraPower
Location: Kemmerrer, Wyoming
Size: 345 megawatts
Operation date: Not available, but the company said in 2021 that it plans to be operational “in the next seven years.” Updated to the 2024 application, that would put it on track for a 2030 completion date.
Cost: Not available, but TerraPower has raised around $1 billion and the federal government has pledged around $2 billion to support the project, which TerraPower has said it will “match … dollar for dollar.”
Why it matters: TerraPower is just one of many companies flogging designs for advanced nuclear reactors, which are smaller and promise to be cheaper to build than America’s existing light-water nuclear reactor fleet. The construction permit application the company submitted in March was a first for a commercial advanced reactor. TerraPower matters as much for the Nuclear Regulatory Commission as it does for anyone else, as it’s a test of whether the NRC can meet Congress and the White House’s preference for a more accelerated approval process for advanced nuclear power.
TerraPower’s design, if successful, would be a landmark for the American nuclear industry. The reactor design calls for cooling with liquid sodium instead of the standard water-cooling of American nuclear plants. This technique promises eventual lower construction costs because it requires less pressure than water (meaning less need for expensive safety systems) and can also store heat, turning the reactor into both a generator and an energy storage system.
While there are a number of existing advanced nuclear designs, several of which involve liquid sodium, Natrium could potentially play well with a renewable-heavy grid by providing steady, unchanging output like a current nuclear reactor as well as discharging stored energy in response to renewables falling off the grid.
8. Mississippi Clean Hydrogen Hub
Heatmap Illustration/Hy Stor
Type: Hydrogen
Developer:Hy Stor
Location: Project components located throughout Mississippi, with some in Eastern Louisiana
Size: Goal of 340,000 metric tons per year (phase one)
Operation date: 2027
Cost: Initially reported as $3 billion; recently reported as more than $10 billion. (In response to an inquiry from Heatmap, the company replied that it “will be in the multiple billions of dollars.”
Why it matters: Truly carbon-free hydrogen could unlock big emissions reductions across the economy, from fertilizer production, to steelmaking, to marine shipping. But few companies are going to the lengths that Hy Stor is gto ensure its product is really clean. The company is building the first off-grid hydrogen production facility powered entirely by wind and solar. That means Hy Stor will have no problem claiming the new hydrogen production tax credit, which requires companies to match their operations with clean energy sources by the hour — a provision that’s been contested by large portions of the hydrogen industry.
For a company that has never built anything before, the scale of Hy Stor’s Mississippi project is ambitious. The company has acquired about 70,000 acres across Mississippi and Louisiana, along with 10 underground salt domes — mounds of salt buried beneath the Earth’s surface that can be dissolved to form cavernous, skyscraper-sized storage facilities for hydrogen. Those salt domes are the key to Hy Stor’s approach, and what enables the company to rely on intermittent renewables. By storing vast amounts of hydrogen, the company will be able to deliver a steady supply to customers and will also have a backup source of energy for its own operations when wind and solar are less available.
Chief Commercial Officer Claire Behar told Heatmap the company has obtained many of the necessary permits, including for its salt caverns and the plant’s water use. It plans to begin construction at the beginning of 2025, and to have the first phase of the project “in service at scale” by 2027. Hy Stor recently announced a deal to purchase its electrolyzers, devices that split water molecules into hydrogen and oxygen, from a Norwegian company called Nel Hydrogen. It has also signed up a few customers, including a local port and a green steel company.
9. Project Cypress
Heatmap Illustration/Project Cypress
Type: Carbon removal
Developers: Climeworks, Heirloom, and Battelle
Location: Calcasieu Parish, Louisiana
Size: Goal of capturing 1 million metric tons per year
Operation date: About 2030
Cost: Total project cost unknown; eligible for up to $600 million from the Department of Energy for its Regional Direct Air Capture Hubs Program.
Why it matters: Project Cypress might be the most ambitious project to remove carbon from the atmosphere under development in the world. It is a collaboration by two leading direct air capture companies, Heirloom Carbon Technologies and Climeworks, which were among the first to demonstrate their ability to capture carbon directly from the air and store it at commercial scale. Now, the two will be attempting to scale up exponentially, from capturing a few thousands tons per year to a combined million.
Last August, the Department of Energy selected Project Cypress to be one of four direct air capture hubs it will support with $3.5 billion from the Bipartisan Infrastructure Law. In March, the project was awarded its first infusion of $50 million, but the developers will have to do extensive community engagement to continue receiving funding. Battelle, the project developer, told Heatmap the project has also received an additional $31 million in private investment.
Between financing, permitting challenges, renewable energy sourcing, and community opposition, the project is sure to face a bumpy road ahead. The project and its developers have no ties to the oil and gas industry, but that hasn’t done much to win over the support of environmental justice advocates, who see the project as a dangerous distraction from cutting emissions and pollution in Louisiana. But if Project Cypress is successful, it will show the world what direct air capture looks like at climate-relevant scales.
10. Project Permian
Heatmap Illustration/NET Power
Type: Carbon capture
Developer: NET Power
Location: Ector County, Texas
Size: 300 megawatts
Operation date: Late 2027 or early 2028
Cost: About$1 billion
Why it matters: Oil and gas CEOs love to say that the problem is not fossil fuels, the problem is emissions. NET Power’s technology — a natural gas power plant with zero emissions, carbon or otherwise — could prove to be the ultimate vindication of that statement. In short, NET Power’s system recycles most of the CO2 it produces and uses it to generate more energy. It also utilizes pure oxygen, unlike typical natural gas plants that take in regular air, which is mostly nitrogen. This means that any remaining CO2 not recycled in the plant is relatively pure and easy to capture.
NET Power opened a 50 megawatt demonstration plant in La Porte, Texas, in 2018, and is developing a 300 megawatt commercial plant in Ector County, Texas, in partnership with Occidental Petroleum, Baker Hughes, and Constellation Energy. On a recent earnings call, CEO Danny Rice said the project was “expected to have a lower levelized cost per kilowatt hour than new nuclear, new geothermal, and new hydro.”
The company generated a lot of excitement among energy experts in the fall of 2021 when it announced that its La Porte project had successfully delivered power to the Texas grid. It also raised a lot of money when it went public last summer. But things have been somewhat rocky since. During a December earnings call, NET Power’s president told investors that its first commercial plant would be delayed by at least a year due to supply chain challenges. According to filings with the Securities and Exchange Commission, the company also applied for funding from the Department of Energy’s Office of Clean Energy Demonstrations last year, but was not selected. It has not yet found any third parties to license its technology or offtakers to buy energy from the Ector County plant, and noted in its recent filings that while the La Porte pilot project delivered electricity to the grid, it did not, in fact, deliver “net” power — meaning that it used more power than it generated.
A spokesperson for the company told Heatmap the La Porte facility was solely intended to “prove the technical viability of the NET Power Cycle” and not intended to produce net power. So everything’s now riding on Project Permian.
World Bank/Recipe for a Livable Planet report
A flooded hospital entrance in Porto Alegre Max Peixoto/Getty Images
Cypress Creek Renewables
Heatmap Illustration/Getty Images
Heatmap Illustration/Form Energy
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Heatmap Illustration/Fervo
Heatmap Illustration/TerraPower
Heatmap Illustration/Hy Stor
Heatmap Illustration/Project Cypress
Heatmap Illustration/NET Power