Aeromine Technologies builds a motionless, bladeless rooftop wind energy system for commercial and industrial buildings. Its 10-foot units sit along a roof's edge and use vertical airfoils to capture and amplify a building's own airflow, generating electricity silently and without spinning blades. The company says the system can produce up to 50% more energy than a comparable rooftop solar array while using roughly 10% of the roof space, and it is designed to complement, not replace, solar. Founded in 2021 and headquartered in Houston, Aeromine has run pilots with BASF and BMW Group and raised a ~$9M Series A led by Veriten in 2024.
Bedrock Energy is an Austin-based geothermal startup making heating and cooling for commercial buildings cheaper and cleaner. By reengineering oil-and-gas drilling technology with real-time subsurface sensing and simulation software, Bedrock drills geothermal boreholes up to 5x faster, then designs and delivers ground-source heat pump systems that can cut a building's HVAC energy costs in half while slashing related air pollution.
CleanFiber makes high-performance, carbon-negative cellulose building insulation from recycled corrugated cardboard. Using a proprietary wet separation and liquid borate infusion process, it produces a cleaner, lower-dust insulation that performs better than legacy newsprint-based cellulose. Based in Buffalo, New York, the company has scaled rapidly since opening commercial production in 2020 and was named the #1 fastest-growing manufacturing company in America on the 2024 Inc. 5000.
Cortex Building Intelligence (now branded Cortex Sustainability Intelligence) is a New York and Nashville based proptech company that uses machine learning to help commercial real estate owners cut energy waste and carbon emissions. Founded in 2014 by Bryan Bennett, its energy insights platform turns raw building data into specific operational moves, helping office portfolios like Empire State Realty Trust, Silverstein Properties, Savanna, and RXR lower costs and meet decarbonization mandates such as NYC's Local Law 97.
Dandelion Energy is an Alphabet (Google X) spinout that designs, installs, and finances residential and multifamily geothermal heating and cooling systems. By drilling ground loops that tap the earth's stable temperature and pairing them with a proprietary heat pump, Dandelion replaces fossil-fuel furnaces and air conditioners with a single all-electric system that cuts home heating and cooling bills while eliminating on-site emissions. The company has grown into the largest home geothermal provider in the U.S., installing thousands of systems and partnering with the nation's largest production homebuilders and multifamily developers to make geothermal a default option for new construction.
Dioxycle is a French-American climate-tech company building a low-temperature electrolyzer that turns waste CO2, water, and renewable electricity into sustainable ethylene - the world's most-used organic chemical - at a cost competitive with fossil-derived ethylene. Founded in 2021 by electrochemists Sarah Lamaison and David Wakerley, it aims to electrify chemical manufacturing and recycle industrial carbon emissions at gigaton scale.
Fervo Energy is a Houston-based next-generation geothermal company that borrows horizontal drilling and fiber-optic sensing from the oil and gas playbook to make enhanced geothermal systems (EGS) commercially viable. By drilling into hot dry rock almost anywhere - not just rare natural hotspots - Fervo produces around-the-clock, carbon-free firm power. Its flagship Cape Station project in Utah is on track to be the world's largest next-generation geothermal development, and the company has become a go-to supplier of clean baseload electricity for AI data centers and utilities.
Form Energy is an American energy-storage company building iron-air batteries that store electricity for 100 hours - multiple days - at roughly one-tenth the cost of lithium-ion. Founded in 2017 by a group of storage veterans, the company uses 'reversible rusting' of cheap, abundant iron to let renewable grids stay reliable through long stretches of low wind and sun. Its first high-volume factory, Form Factory 1, sits on the site of the former Weirton Steel mill in West Virginia, and its batteries are now being deployed with utilities including Great River Energy, Xcel Energy, Georgia Power and Dominion Energy.
Fourier is a Palo Alto-based clean-energy company building modular, fully automated electrolyzers that produce green hydrogen on-site and on-demand. By borrowing architecture from the data center industry - racks of small, software-managed electrolyzer 'blades' running on reprogrammed mass-produced power supplies - Fourier aims to eliminate the costly, hazardous transportation and storage that inflate hydrogen prices, making clean hydrogen practical for heavy industry, transportation fuel, and distributed energy storage.
Group14 Technologies is a Woodinville, Washington battery materials company that makes SCC55, a silicon-carbon composite anode material that replaces graphite in lithium-ion batteries to deliver higher energy density and faster charging. Spun out of EnerG2 in 2015 by Rick Luebbe and Dr. Rick Costantino, the company operates commercial factories in Washington State and South Korea and supplies more than 100 EV, consumer electronics, and energy-storage cell makers worldwide. It has raised over $1 billion in equity, including a $463M Series D in 2025 led by SK, Inc.
InPipe Energy is a Portland, Oregon cleantech company that turns the wasted pressure inside existing water pipelines into carbon-free electricity. Its flagship HydroXS system pairs micro-hydropower turbines with smart pressure controls that retrofit into municipal, industrial, and community water infrastructure - no dams, no new construction, no environmental harm. Founded in 2016 by Gregg Semler, the company helps water utilities and cities generate reliable baseload power, cut energy costs, and decarbonize aging infrastructure.
Last Energy is a US-based developer of factory-built micro modular nuclear power plants. Its flagship PWR-20 is a 20-megawatt pressurized water reactor assembled from truck-shippable modules and delivered as a turnkey, build-own-operate service. Rather than selling reactors, Last Energy sells electricity and heat under long-term power purchase agreements, targeting data centers and energy-intensive industries that need reliable, carbon-free baseload power without financing or operating a plant themselves.
Bret Kugelmass is the founder and CEO of Last Energy, an Austin-based company building factory-made 20-megawatt nuclear power plants designed to be shipped, assembled, and switched on like industrial equipment rather than built on-site like cathedrals. A Stanford-trained roboticist who once helped build a lunar rover control device at NASA, he sold a drone startup, then interviewed more than 800 nuclear experts on his Titans of Nuclear podcast before concluding that the technology was never the problem - the cost of slow, custom construction was. Last Energy has raised about $164 million, closing an oversubscribed $100 million Series C in December 2025, and is racing to plug a pilot reactor into the Texas A&M-RELLIS grid by mid-2026.
Colin South is a New Zealand-born biotechnology executive and the founding leader of ArkeaBio, a Boston climate-tech company building the world's first vaccine to cut methane emissions from cattle. He grew up on a 1,000-head sheep farm, earned a PhD in bioprocess engineering from Dartmouth, and spent 25-plus years turning microbes into commercial products across the food, fuel, and energy industries. He launched ArkeaBio in 2021, ran it as CEO from January 2022, and in September 2025 stepped into the Chief Business Officer seat as the company brought in a new CEO and pushed toward field trials.
Dan Yates is the CEO and Chairman of Dandelion Energy, the largest residential geothermal company in the United States, a startup spun out of Google X that drills backyard boreholes to heat and cool homes with the steady temperature of the earth. Before geothermal, he co-founded Opower, the energy-efficiency software company he took public in a billion-dollar-plus 2014 IPO and sold to Oracle in 2016. A Harvard computer scientist turned climate operator, Yates describes his own superpower as being 'a terrible loser' and is doggedly betting that 'lukewarm' geothermal becomes a mainstream pillar of the clean-energy transition.
Novoloop is a California-based circular materials company that chemically upcycles hard-to-recycle plastic waste - the grocery bags, food films and mailers that mechanical recycling can't handle - into virgin-quality, high-performance polyols and thermoplastic polyurethane (TPU). Using its proprietary Accelerated Thermal Oxidative Decomposition (ATOD) process and Lifecycling platform, the company turns post-consumer polyethylene into materials used in footwear, electronics and automotive goods, with a substantially lower carbon footprint than fossil-based equivalents. Founded in 2015 by childhood friends Miranda Wang and Jeanny Yao, Novoloop has raised over $50 million and counts On's Cloudprime sneaker among its first commercial showcases.
Odys Aviation is a Long Beach, California deep-tech aerospace company building long-range, hybrid-electric vertical takeoff and landing (VTOL) aircraft. Its blown-wing design lets aircraft lift off and land anywhere - no runway needed - while flying farther and carrying more than battery-only eVTOLs. With two platforms, the Laila tactical cargo drone and the larger Alta regional aircraft, Odys targets defense, logistics and passenger markets, and has amassed more than $11 billion in signed letters of intent.
Planet FWD is a San Francisco climate management platform that helps consumer brands measure, reduce and neutralize their carbon footprint. Founded in 2019 by Zume co-founder Julia Collins, the company pairs an AI-powered life-cycle assessment engine and a database built on 16+ years of research with Scope 1, 2 and 3 corporate inventories aligned to the GHG Protocol and the Science Based Targets initiative. The result: brands like Patagonia Provisions, Kashi, Just Salad and Numi Organic Tea can put an auditable carbon number on the products people actually buy - and get a roadmap to shrink it, on average by about 35% per product.
Project Canary is a Denver-based climate-tech public-benefit corporation that turns methane and emissions data into operational intelligence for energy companies. It pairs high-fidelity continuous monitoring hardware (the EPA-approved Canary X sensor) with a cloud platform (SENSE) and independent well-level ESG ratings (TrustWell), helping oil & gas producers and natural gas utilities detect leaks, cut emissions, meet regulations, and prove the climate attributes of their gas.
Remora is a Detroit-area climate-tech company that bolts carbon capture onto the things already burning fuel - semi-trucks and freight locomotives - instead of building giant plants to pull CO2 back out of the sky. Its zero-backpressure device threads exhaust through proprietary adsorbents, captures up to 90% of the CO2, reduces soot and NOx to Tier 4 levels, then liquefies the gas to be sold into a supply-constrained industrial CO2 market. Operators share the revenue, so cutting emissions becomes a line item that pays rather than one that costs.
Runwise is a New York-based smart-building company that retrofits aging heating, cooling, water, and electrical systems with proprietary wireless hardware, sensors, and cloud software. Its platform learns each building's behavior and automatically runs core systems at the minimum needed, cutting fuel use 20-25%, lowering carbon emissions, and helping owners comply with climate laws like NYC's Local Law 97. Used in over 10,000 buildings across the U.S., Runwise has saved customers more than $100 million in energy costs and positions itself as the operating system for buildings still running on 1960s technology.
Seurat Technologies is a Massachusetts-based contract metal manufacturer built around Area Printing, a laser powder bed fusion process invented at Lawrence Livermore National Laboratory. Instead of melting metal powder one point at a time, Seurat uses millions of tiny laser points to print entire areas at once, decoupling resolution from speed. The company doesn't sell printers; it runs its own clean-energy print factories and sells finished parts at costs meant to rival casting, forging, and machining, with the goal of reshoring high-volume metal manufacturing and cutting its carbon footprint.
Gregg Semler is the founder and CEO of InPipe Energy, a Portland-based company that generates clean, around-the-clock electricity from the water already flowing through municipal pipelines. A serial clean-energy entrepreneur since 2000, he previously led PolyFuel, ClearEdge Power, and Lucid Energy, and spent years as a venture investor in the sustainable economy. His pitch is contrarian: instead of covering the planet with solar panels and batteries, harvest the predictable, weather-proof energy hiding in the millions of miles of pressurized pipe that move our drinking water.
James DeMuth is the co-founder and CEO of Seurat Technologies, a Wilmington, Massachusetts metal additive manufacturing company chasing a single audacious goal: printing metal parts fast and cheap enough to compete with mass production, then planting factories next to the customers who need them. He co-invented Seurat's Area Printing technology while working on laser fusion research at Lawrence Livermore National Laboratory, holds a hand in roughly 145 patents, and has raised more than $181 million to reshore manufacturing and cut carbon out of how metal gets made.
Jeffrey Carleton is the co-founder and CEO of Runwise, a New York-based smart-building company that pairs proprietary wireless sensors with cloud software to cut the energy that boilers, cooling, electric and water systems waste. Drawing on seven years spent running 150 New York apartment buildings, he turned a hands-on operator's frustration with 1960s heating controls into a platform now deployed in more than 10,000 buildings, serving roughly 1,000 customers and saving over $100 million in energy costs. In June 2025 Runwise raised a $55 million Series B led by Menlo Ventures, bringing total funding to $79 million, around a thesis Carleton states bluntly: every building needs to be rebuilt with software, not bricks.
SYSO Technologies is a Boston-based market operations partner for renewable energy and battery storage assets. The company acts as the market operator for solar, wind, and energy storage projects, handling registration, forecasting, bidding, scheduling, real-time dispatch, and settlement across every major North American ISO/RTO market. Its cloud-based, AI-enabled Energy Management Platform turns passive renewable generators into active market participants, and by 2026 SYSO managed more than 4.5 GW across 300+ sites.
Joselyn Lai is the co-founder and CEO of Bedrock Energy, an Austin-based climate-tech company drilling deep, autonomous geothermal wells to heat and cool large commercial buildings for a fraction of conventional cost and land. After a decade across sustainable agriculture, transportation, and consulting, she paired up with oil-and-gas drilling scientist Silviu Livescu to repurpose upstream drilling techniques for the half-kilometer of free thermal energy sitting beneath every building. In January 2025 the company raised a $12M Series A led by Titanium Ventures to scale projects across Texas and the Mountain West.
Josh Browne is the co-founder and CEO of M2X Energy, a Rockledge, Florida climate-tech company that converts wasted methane from flares and landfills into low-carbon methanol using modular, truck-transportable gas-to-liquids systems built around repurposed internal-combustion engines. M2X grew out of his Columbia PhD dissertation, was founded in 2020 by Breakthrough Energy Ventures, and raised a $40 million Series B in 2024 (about $62.5 million total). Before M2X, Browne founded a data-science firm, Rho AI, that was acquired by General Motors. He started as the company's CTO and now runs it as CEO.
Julia Collins is the founder and CEO of Planet FWD, a San Francisco climate-intelligence software company that helps consumer brands measure and cut the carbon footprint of their products. She is the first Black woman to co-found a unicorn (Zume Pizza, valued at $2.25B), a three-time food-industry founder, and the creator of Moonshot Snacks, the climate-friendly cracker brand acquired by Patagonia Provisions in 2023. Planet FWD turns life-cycle assessments and Scope 1/2/3 inventories into decarbonization roadmaps for brands from Cava to Everlane.
Kevin Bush is the co-founder and CEO of Molten Industries, an Oakland-based deep tech company using methane pyrolysis to crack natural gas into clean hydrogen and battery-grade synthetic graphite. A Stanford-trained materials scientist who set perovskite solar efficiency records before co-founding Swift Solar, Bush is a Breakthrough Energy Fellow and Forbes 30 Under 30 honoree. He started Molten in a Stanford garage in 2021 and raised a $25M Series A in 2024 to build its first modular commercial reactor.