What are the latest funding news in the climate tech market? (September 2026)
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This review identified 12 disclosed climate tech financings announced from 29 July to 31 August 2026.
Reported deal values totaled about $2.73B, with large rounds for advanced nuclear, long-duration storage and industrial thermal batteries shaping the period.
And if you want to better understand this new industry, you can download our pitch covering the climate tech market.
Insights
- The three largest climate tech rounds, Valar Atomics, Form Energy and Antora Energy, represented about 84% of the $2.73B reported during this period, showing how capital concentrated in infrastructure-heavy decarbonization technologies.
- Long-duration energy storage attracted about $806M across Form Energy, Ore Energy and Certain Energy, confirming that multi-day grid storage remained a major climate tech funding theme.
- Advanced nuclear and geothermal together brought in $1.18B, indicating strong investor interest in clean firm power that can support electrified industry and data-center demand.
- Four sub-$10M rounds accounted for one-third of the deals but less than 1% of disclosed capital, highlighting the wide gap between climate tech seed funding and later-stage project scale-up.
- Data-center energy demand appeared across Hayzel and Teragen Energy, while storage and firm-power companies also address the same load-growth challenge from different parts of the energy system.
- Industrial decarbonization covered several distinct approaches, including low-carbon ammonia, thermal batteries, sustainable aviation fuel and critical-mineral recovery, rather than one single technology category.
As this chart shows, and as featured in our climate tech market deck, search interest in climate change has continued to rise
Summary table of the latest funding deals in the climate tech market as of September 2026
We define the climate tech market as technologies whose main purpose is to reduce greenhouse gas emissions or help people, assets and ecosystems adapt to the impacts of climate change.
We include solutions across energy, mobility, buildings, industry, food and land use, carbon removal, and the digital and financial tools that directly enable these mitigation or adaptation outcomes.
We exclude broad ESG and sustainability tools, general environmental or social impact solutions without a clear climate focus, and consumer products whose climate impact is indirect, marginal or mainly marketing-driven.
You can also read our detailed analysis to understand how funding activity in the climate tech market has evolved over the last few years.
We also have a quarter-by-quarter analysis of funding activity in the market here.
Finally, you can check our complete list of fundraising deals for the climate tech market (we update this list every quarter) as well as our ranking of the most funded startups.
| Name | When | Amount in $ | Round Type | Category |
|---|---|---|---|---|
| Nexeon | 31 August 2026 | About $133M | Growth equity | Battery Materials & Transport Decarbonization |
| Hayzel | 28 August 2026 | $3.6M | Seed | Energy Efficiency & Data-Center Decarbonization |
| Facet Amtech | 28 August 2026 | About $2.0M | Seed | Industrial Decarbonization & Low-Carbon Ammonia |
| Quaise Energy | 27 August 2026 | $180M | Series B | Geothermal & Clean Firm Power |
| Teragen Energy | 26 August 2026 | $6M | Pre-seed | Distributed Clean Power & Data-Center Decarbonization |
| Certain Energy | 26 August 2026 | About $12.7M | Series A | Long-Duration Energy Storage |
| Form Energy | 12 August 2026 | $750M | Series G | Long-Duration Energy Storage |
| Ore Energy | 4 August 2026 | $43M | Series A | Long-Duration Energy Storage |
| Valar Atomics | 3 August 2026 | $1B | Series B | Advanced Nuclear & Clean Firm Power |
| Antora Energy | 30 July 2026 | $550M | Series C | Industrial Decarbonization & Thermal Energy Storage |
| Lydian | 30 July 2026 | $43M | Series A | Sustainable Aviation Fuel & Industrial Decarbonization |
| FAST Metals | 29 July 2026 | $4.3M | Pre-seed | Critical-Mineral Recovery & Circular Materials |
All the latest funding deals during in the climate tech market as of September 2026
Nexeon raised about $133M in a growth equity round in August 2026.
When was it?
Nexeon announced the financing on 31 August 2026.
Who are they?
Nexeon develops silicon-rich anode materials that can increase lithium-ion battery energy density and reduce material intensity.
Geographical focus?
Nexeon is based in the United Kingdom and serves battery customers with global operations.
Why do we include them in the climate tech market?
Nexeon supports transport and energy-storage decarbonization through lower-impact, higher-performance battery materials.
What is the company stage?
Nexeon is at an industrial scale-up and commercial-growth stage.
How much did they raise?
Nexeon raised about $133M, equivalent to £100M, in this financing.
What round is it?
Nexeon completed a growth equity round.
Why did they raise?
Nexeon raised the capital to scale UK battery-material production and expand commercial supply.
Hayzel raised $3.6M in a seed round in August 2026.
When was it?
Hayzel announced the seed round on 28 August 2026.
Who are they?
Hayzel builds a turbine-generator that replaces a chiller expansion valve and recovers cooling energy otherwise lost in data centers.
Geographical focus?
Hayzel is focused on the United States, beginning with data-center cooling systems.
Why do we include them in the climate tech market?
Hayzel improves data-center energy efficiency by converting wasted cooling-system energy into usable power.
What is the company stage?
Hayzel is a seed-stage company moving toward early commercial pilots.
How much did they raise?
Hayzel raised $3.6M in this round.
What round is it?
Hayzel completed a seed round.
Why did they raise?
Hayzel raised the capital to commercialize its Liquid-Vapor Expander and deploy it with data-center cooling systems.
This chart, featured in our climate tech market deck, compares the main business model options for carbon management platforms
Facet Amtech raised about $2.0M in a seed round in August 2026.
When was it?
Facet Amtech announced the seed round on 28 August 2026.
Who are they?
Facet Amtech is developing a catalyst and process to make ammonia from nitrogen and water without a separate hydrogen-production step.
Geographical focus?
Facet Amtech is based in Australia and is building technology for global ammonia markets.
Why do we include them in the climate tech market?
Facet Amtech aims to reduce emissions from ammonia production, an important industrial feedstock and potential energy carrier.
What is the company stage?
Facet Amtech is at a pre-pilot deep-tech scale-up stage.
How much did they raise?
Facet Amtech raised about $2.0M, equivalent to A$3M, in this financing.
What round is it?
Facet Amtech completed a seed round.
Why did they raise?
Facet Amtech raised the funding to hire technical talent, build its first pilot plant and secure independent validation.
Quaise Energy raised $180M in a Series B round in August 2026.
When was it?
Quaise Energy announced the Series B round on 27 August 2026.
Who are they?
Quaise Energy develops millimeter-wave drilling technology designed to reach superhot geothermal resources for clean baseload power.
Geographical focus?
Quaise Energy is headquartered in the United States, while its geothermal opportunity is global.
Why do we include them in the climate tech market?
Quaise Energy can enable zero-carbon firm power by making deeper and hotter geothermal resources accessible.
What is the company stage?
Quaise Energy is moving from demonstration work toward commercialization.
How much did they raise?
Quaise Energy raised $180M, including a $35M strategic investment from Nabors Industries.
What round is it?
Quaise Energy completed a Series B round.
Why did they raise?
Quaise Energy raised the capital to fund Project Obsidian and continue developing its drilling system.
This chart, featured in our climate tech market deck, looks at First Solar’s strategy in climate tech
Teragen Energy raised $6M in a pre-seed round in August 2026.
When was it?
Teragen Energy announced the oversubscribed pre-seed round on 26 August 2026.
Who are they?
Teragen Energy develops modular solid-oxide fuel-cell systems for lower-carbon onsite power at industrial sites, utilities and data centers.
Geographical focus?
Teragen Energy is focused on the United States and has an Asia-linked strategic investor base.
Why do we include them in the climate tech market?
Teragen Energy addresses distributed clean power needs for hard-to-electrify industrial and data-center customers.
What is the company stage?
Teragen Energy is at a pre-seed, prototype-to-pilot stage.
How much did they raise?
Teragen Energy raised $6M in this financing.
What round is it?
Teragen Energy completed a pre-seed round.
Why did they raise?
Teragen Energy raised the capital to move its fuel-cell platform from prototypes toward first commercial pilots.
Certain Energy raised about $12.7M in a Series A round in August 2026.
When was it?
Certain Energy announced the Series A financing on 26 August 2026.
Who are they?
Certain Energy develops manganese flow batteries designed to provide long-duration energy storage for electricity grids.
Geographical focus?
Certain Energy is based in the United Kingdom and targets grid markets globally.
Why do we include them in the climate tech market?
Certain Energy supports renewable-power integration with long-duration grid storage.
What is the company stage?
Certain Energy is a Series A company at the commercialization stage.
How much did they raise?
Certain Energy raised about $12.7M, equivalent to £10M, in this financing.
What round is it?
Certain Energy completed a Series A round.
Why did they raise?
Certain Energy raised the capital to commercialize its battery technology and prepare for grid deployments at volume.
In our climate tech market deck, we identify pain points entrepreneurs should prioritize
Form Energy raised $750M in a Series G round in August 2026.
When was it?
Form Energy announced the Series G financing on 12 August 2026.
Who are they?
Form Energy builds iron-air batteries designed to store electricity for roughly 100 hours.
Geographical focus?
Form Energy is focused on the United States grid market.
Why do we include them in the climate tech market?
Form Energy helps grids use more renewable electricity through multi-day energy storage.
What is the company stage?
Form Energy is at a late-growth stage, with factory and project deployment scaling underway.
How much did they raise?
Form Energy raised $750M in this round.
What round is it?
Form Energy completed a Series G round.
Why did they raise?
Form Energy raised the capital to expand manufacturing capacity and deploy more 100-hour grid batteries.
Ore Energy raised $43M in a Series A round in August 2026.
When was it?
Ore Energy announced the Series A financing on 4 August 2026.
Who are they?
Ore Energy develops iron-air energy-storage systems for power-grid applications.
Geographical focus?
Ore Energy is focused on European energy markets.
Why do we include them in the climate tech market?
Ore Energy enables higher renewable-energy penetration through long-duration grid storage.
What is the company stage?
Ore Energy is a Series A company at an early commercial stage.
How much did they raise?
Ore Energy raised $43M in this financing.
What round is it?
Ore Energy completed a Series A round.
Why did they raise?
Ore Energy raised the capital to scale manufacturing and commercial deployments.
This market map, featured in our climate tech market deck, highlights top companies and startups in the climate tech market
Valar Atomics raised $1B in a Series B round in August 2026.
When was it?
Valar Atomics announced the Series B financing on 3 August 2026.
Who are they?
Valar Atomics develops advanced nuclear reactors intended to provide abundant low-carbon electricity.
Geographical focus?
Valar Atomics is focused on the United States.
Why do we include them in the climate tech market?
Valar Atomics is developing clean firm power that can support a deeply decarbonized electricity system.
What is the company stage?
Valar Atomics is at a growth-stage reactor-development and manufacturing scale-up phase.
How much did they raise?
Valar Atomics raised $1B in this financing.
What round is it?
Valar Atomics completed a Series B round.
Why did they raise?
Valar Atomics raised the capital to accelerate reactor development, demonstration and manufacturing.
Antora Energy raised $550M in a Series C round in July 2026.
When was it?
Antora Energy announced the Series C financing on 30 July 2026.
Who are they?
Antora Energy stores renewable electricity as very high-temperature heat for industrial customers.
Geographical focus?
Antora Energy is based in the United States and serves industrial customers globally.
Why do we include them in the climate tech market?
Antora Energy decarbonizes industrial heat with thermal batteries that can use renewable electricity.
What is the company stage?
Antora Energy is at a growth stage with commercial deployments underway.
How much did they raise?
Antora Energy raised $550M in this financing.
What round is it?
Antora Energy completed a Series C round.
Why did they raise?
Antora Energy raised the capital to expand thermal-battery manufacturing and industrial projects.
This chart, featured in our climate tech market deck, illustrates yearly funding for climate tech startups
Lydian raised $43M in a Series A round in July 2026.
When was it?
Lydian announced the Series A financing on 30 July 2026.
Who are they?
Lydian uses captured carbon dioxide and clean energy to make sustainable aviation fuel and other low-carbon hydrocarbons.
Geographical focus?
Lydian is focused on the United States and the global aviation-fuel market.
Why do we include them in the climate tech market?
Lydian supports aviation decarbonization by producing lower-carbon fuels from captured carbon dioxide and clean energy.
What is the company stage?
Lydian is a Series A company progressing from pilot operations toward commercial production.
How much did they raise?
Lydian raised $43M in this financing.
What round is it?
Lydian completed a Series A round.
Why did they raise?
Lydian raised the capital to scale its technology toward commercial fuel production.
FAST Metals raised $4.3M in a pre-seed round in July 2026.
When was it?
FAST Metals announced the pre-seed financing on 29 July 2026.
Who are they?
FAST Metals recovers critical minerals from waste and low-grade material streams.
Geographical focus?
FAST Metals is focused on the United States.
Why do we include them in the climate tech market?
FAST Metals supports circular climate materials by reducing dependence on virgin extraction for critical minerals.
What is the company stage?
FAST Metals is at a pre-seed stage and is validating its process through pilot work.
How much did they raise?
FAST Metals raised $4.3M in this financing.
What round is it?
FAST Metals completed a pre-seed round.
Why did they raise?
FAST Metals raised the capital to validate and scale its recovery process and pilot projects.
Related blog posts
- The evolution of funding activity in climate tech
- The main fundraising trends in climate tech
- How strong is fundraising in the climate tech market right now?
- What are the top startups in the climate tech market?
