Climate tech companies are moving from ambitious pilots to commercial infrastructure. In 2026, the most useful watchlist is not a simple ranking. It is a cross-sector view of businesses solving hard problems in energy, industry, transport, agriculture, carbon removal, and corporate decision-making.
This guide profiles ten companies with credible deployment signals and explains what decision-makers should watch next. The list balances global leaders with an India-based company, and it distinguishes proven scale from projects that remain early. For more context, see GreenCentral’s guides to machine learning for climate technology and agentic AI for climate action.
How we selected these climate tech companies
We looked for more than a bold mission. Each company shows at least one meaningful signal: operating assets, commercial agreements, verified production, repeat customers, or infrastructure under construction. Moreover, the sectors matter. A credible climate portfolio needs technologies that avoid emissions today, improve resilience, and address emissions that are difficult to eliminate.
However, inclusion is not an endorsement or investment recommendation. Many climate technologies remain capital-intensive, policy-sensitive, or dependent on future cost reductions. Buyers and investors should examine unit economics, project execution, lifecycle emissions, and independent verification.
10 climate tech companies to watch in 2026
1Climate tech companies: Redwood Materials
Redwood Materials has expanded beyond battery recycling into critical-materials production and second-life energy storage. In 2025, it launched Redwood Energy and deployed a 12 MW/63 MWh microgrid using repurposed batteries. The company also brought the first phase of its South Carolina recycling operations online and reported 60,000 metric tons of critical-mineral production at its Nevada campus.
Why watch: Redwood connects three markets that are often treated separately: battery recycling, domestic materials supply, and grid storage. The key test is whether its second-life systems can maintain reliability and cost advantages as deployments grow.
2Form Energy
Form Energy is developing iron-air batteries designed to store electricity for up to 100 hours. That duration targets multi-day gaps in wind and solar generation rather than the shorter balancing role served by most lithium-ion systems. In March 2026, the company announced a planned 10 MW/1,000 MWh project in Ireland, its first announced international deployment.
Why watch: Multi-day storage could reduce reliance on fossil-fuel backup and expensive grid overbuilding. Among climate tech companies, Form must now prove manufacturing scale, project delivery, and durable performance across different power markets.
3Climate tech companies: Fervo Energy
Fervo Energy applies horizontal drilling and subsurface sensing methods to enhanced geothermal systems. Its Cape Station project in Utah is intended to deliver round-the-clock clean power, with an initial phase of about 100 MW targeting first power in late 2026 and a larger phase under construction for later delivery.
Why watch: Geothermal power can complement variable renewables because it is available continuously. The commercial question is whether Fervo can repeat its drilling results, control construction costs, and develop projects quickly enough to serve growing power demand.
4Climate tech companies: Climeworks
Climeworks operates direct air capture facilities that remove carbon dioxide from ambient air for permanent storage. Its Mammoth update reported 675 tonnes of net carbon removal in the first half of 2026, up from 119 tonnes in the same period of 2025. The increase is meaningful, but it also shows how early the sector remains relative to global emissions.
Why watch: Climeworks provides unusually transparent operational data in a field filled with projections. Buyers comparing climate tech companies should focus on verified net removal, energy use, cost decline, and operating uptime rather than headline nameplate capacity.
5Heirloom
Heirloom uses limestone-based direct air capture and operates a commercial facility in California. Its first Louisiana facility, designed for 17,000 tonnes of annual removal capacity, is scheduled to come online in 2026. Later phases at the same site are planned to raise capacity substantially.
Why watch: Heirloom offers a different engineering route to direct air capture and is advancing a staged scale-up strategy. Execution at the Louisiana site will provide a practical test of construction timelines, community engagement, removal verification, and cost reduction.
6Twelve
Twelve converts captured carbon dioxide, water, and renewable electricity into fuels and chemical feedstocks. Its AirPlant One facility in Washington is under construction, with the company targeting its first commercial flights using E-Jet fuel in 2026. Partnerships with fuel-logistics and airline groups are intended to connect production with existing aviation infrastructure.
Why watch: Aviation is difficult to electrify at long distances. Among climate tech companies, Twelve has a large opportunity, but the value of e-fuels depends on clean electricity, credible carbon inputs, high plant utilization, and competitive costs.
7Climate tech companies: Varaha
India-based Varaha develops carbon projects with smallholder farmers across biochar, regenerative agriculture, afforestation, and enhanced rock weathering. In addition, its portfolio includes projects in Maharashtra, Madhya Pradesh, the Indo-Gangetic Plains, and other regions. This gives the company a distinctive position at the intersection of rural livelihoods, measurement, and carbon finance.
Why watch: Varaha shows how climate tech companies can adapt monitoring and project design to fragmented agricultural systems. For Indian buyers and investors, the important questions are additionality, farmer income, permanence, and the quality of digital measurement, reporting, and verification.
8ChargerHelp!
ChargerHelp! combines diagnostics, remote resolution, and field maintenance for electric-vehicle charging networks. Its research argues that reported charger uptime can overstate the driver’s actual experience. The company therefore emphasizes first-time charge success and documented root-cause resolution.
Why watch: EV adoption depends on reliable infrastructure, not only charger installation counts. Among climate tech companies, ChargerHelp addresses a less visible operating layer: data integration, fault diagnosis, technician dispatch, and accountability across fragmented networks.
9CarbonCure Technologies
CarbonCure Technologies injects captured carbon dioxide into fresh concrete, where it mineralizes and becomes permanently embedded. The process can also improve cement efficiency. By 2026, the company reported more than 10 million truckloads of concrete produced with its technology across projects in two dozen countries.
Why watch: Concrete is a hard-to-abate material with enormous global demand. CarbonCure stands out among climate tech companies because it deploys through existing plants. However, buyers still need project-specific lifecycle data and transparent credit accounting.
10Climate tech companies: Watershed
Watershed provides software for emissions measurement, reporting, supplier analysis, and decarbonization planning. Meanwhile, its newer product-footprint tools use AI to model upstream materials and processes, while allowing sustainability teams to refine results with primary data. The platform also supports audit-ready reporting workflows.
Why watch: Climate software creates value only when it improves real procurement and operating decisions. Watershed’s test is whether climate tech companies can use automation to produce traceable, decision-grade data rather than faster estimates with hidden assumptions.
What buyers and investors should evaluate
These climate tech companies operate at very different stages, so one scorecard will not fit all of them. For example, infrastructure businesses should be judged on delivered capacity, uptime, cost, safety, and contracted demand. Carbon-removal providers require rigorous additionality, permanence, and lifecycle accounting. Software platforms need traceable methodologies, data controls, and evidence that customers use insights to reduce emissions.
For India, affordability and local operating conditions are especially important. Technologies built around smallholder agriculture, unreliable grids, industrial clusters, and rapidly expanding mobility systems may create more value than solutions imported without adaptation.
Conclusion
The strongest 2026 watchlist is defined by execution, not publicity. Redwood Materials and Form Energy are testing new storage models; Fervo is scaling geothermal power; Climeworks and Heirloom are publishing real-world carbon-removal results; Twelve is moving e-fuels toward commercial aviation; Varaha brings an Indian smallholder lens; ChargerHelp! tackles infrastructure reliability; CarbonCure works inside a hard-to-abate material; and Watershed connects climate data to business decisions.
Together, they show where climate technology is heading: from isolated demonstrations toward systems that must perform reliably, withstand scrutiny, and deliver measurable value.
