Climate Tech Startup Funding 2025-2026

What are all the funding deals in the climate tech market from August 2025 to September 2026?

The table below lists the 42 high-confidence disclosed equity financings identified for pure-play climate tech companies from August 2025 through September 2, 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 digital or financial tools that directly enable mitigation or adaptation outcomes. For a wider view of the companies, funding patterns and opportunities in this market, see our Climate Tech market report.

How active has fundraising been in the climate tech market?

As of September 2026, fundraising in the climate tech market has been active but highly uneven over the requested 12 months. The dataset contains 42 disclosed equity financings totaling approximately $7.04B across 41 unique companies.

Deal flow averages about 3.0 transactions per calendar month in the dataset, with a median of 3.0. That suggests financing activity itself is fairly steady even though the dollar value attached to those financings changes dramatically.

Average capital raised per month is approximately $502.9M, while the median monthly total is about $344.5M. The difference matters because single infrastructure-scale rounds can change the apparent condition of the climate tech market without producing any corresponding increase in company count.

The average round size is approximately $167.6M, but the median is $54.5M. The median is therefore the better starting point for understanding a visible financing, although even it is elevated by the unusually high number of $50M-plus rounds.

For a deeper view of where funding activity is clustering, see our climate tech funding and market report.

How concentrated has fundraising been in the climate tech market?

As of September 2026, fundraising in the climate tech market is extremely concentrated over the requested 12 months. The largest deal represents 14.2% of disclosed capital, the top three reach 39.1%, and the top five absorb 56.8%.

The five largest financings are Commonwealth Fusion Systems at $1.0B, Base Power at $1.0B, Form Energy at $750M, X-energy at $700M and Antora Energy at $550M. Together, those five transactions account for more than half of all capital in the dataset.

The top 10 deals account for 78.2% of disclosed climate tech capital. That means aggregate market totals are primarily measuring conviction around a small group of perceived infrastructure winners rather than the financing experience of the average startup.

This concentration makes deal count an important counterweight to capital totals. A billion-dollar increase in climate tech funding can be caused by one transaction without any material broadening in the number of companies able to raise.

How much of the climate tech funding signal is driven by outliers?

As of September 2026, most of the dollar signal in the climate tech market is driven by outliers over the requested 12 months. Removing rounds strictly above $50M leaves only approximately $427.3M, or 6.1% of total disclosed funding.

Twenty-two of the 42 transactions are strictly above $50M, meaning megarounds represent 52.4% of deal count. Fourteen deals are strictly above $100M, or one-third of all disclosed transactions.

The average round of $167.6M should therefore not be read as typical. Even the $54.5M median sits inside a dataset where 23 of 42 transactions are at least $50M.

The strongest stress test is simple: look at the market without its largest financings. Because the top five remove 56.8% of capital and the top 10 remove 78.2%, the headline $7.04B figure is fundamentally a concentrated-winner statistic.

Is the climate tech market broad with many targets, or narrow with few fundable companies?

As of September 2026, the climate tech market is broad in technical approaches but narrow in where large amounts of private capital actually land over the requested 12 months. The sample contains 41 companies across six categories, yet one category captures almost nine-tenths of all dollars.

Clean Energy Systems contains 23 deals, but the remaining 19 transactions are spread across adaptation, carbon removal, mobility, industrial climate tech and building decarbonization. This shows genuine breadth in company formation even when capital concentration is severe.

Series A is the modal stage with 15 deals, followed by Series B with 10. That pattern indicates an active pipeline of companies beyond the very large late-stage infrastructure financings dominating the dollar totals.

The better interpretation is therefore not that climate tech has few fundable companies. It is that the climate tech market has many fundable technical ideas but only a small number of companies currently receiving infrastructure-scale financial commitments.

Is climate tech mostly an early-stage formation market or a late-stage scaling market?

As of September 2026, the climate tech market combines an early-stage formation pipeline with a late-stage capital market over the requested 12 months. Seed through Series B account for roughly 69% of disclosed transactions but only 20.9% of disclosed capital.

Early-stage rounds raised approximately $1.47B in total. Late-stage financings, defined as Series C, Series D+ and Growth Equity, raised approximately $5.42B, or 77.0% of all capital.

On classified capital alone, late-stage companies attracted about 3.68 times as much funding as early-stage companies. The imbalance reflects both normal stage progression and several unusually large deployment-oriented financings between $500M and $1B.

Seed is especially small in dollar terms. Four seed rounds contribute approximately $32.7M, or less than 0.5% of total funding, while Series A is much broader with 15 deals and approximately $742.6M.

For more context on how capital intensity changes across climate technologies, see our deeper analysis of the climate tech market.

Which categories attract the most investor attention in climate tech?

As of September 2026, Clean Energy Systems attracts by far the most investor attention in the climate tech market over the requested 12 months. The category accounts for 23 of 42 transactions and approximately $6.26B of the $7.04B total.

Climate Adaptation Solutions ranks second by deal count with 7 transactions, followed by Carbon Removal Platforms with 5 and Low Carbon Mobility with 4. Industrial Climate Tech produced 2 deals, while Building Decarbonization Tech produced just 1.

The category ranking by dollars is even more concentrated. Clean Energy Systems takes 89.0% of disclosed capital, compared with 5.2% for mobility, 3.8% for adaptation and only 1.3% for carbon removal.

The distinction between attention and capital matters. Adaptation and carbon removal generate a meaningful number of financings, but investors are still sizing those bets far below nuclear, fusion, grid and storage transactions.

Which categories attract disproportionately large checks in the climate tech market?

As of September 2026, Clean Energy Systems is the only climate tech category attracting disproportionately large checks over the requested 12 months. Its 89.0% capital share divided by its 54.8% deal share produces a capital-share-to-deal-share ratio of 1.62x.

Every other category is below parity. Low Carbon Mobility sits at 0.54x, Climate Adaptation Solutions at 0.23x, Building Decarbonization Tech at 0.12x, and both Carbon Removal Platforms and Industrial Climate Tech at roughly 0.11x.

Median round sizes reinforce the same conclusion. Clean Energy Systems has a $100M median round, compared with approximately $92M for mobility, $15M for adaptation and $11.6M for carbon removal.

This is one of the clearest signals in the dataset: investors are not distributing infrastructure-scale checks evenly across climate technologies. They are concentrating them around power generation, storage, nuclear, fusion, geothermal and grid systems.

Which geographies matter most for fundraising in the climate tech market?

As of September 2026, North America matters most for fundraising in the climate tech market over the requested 12 months. It accounts for 31 of 42 disclosed transactions and approximately $6.50B, or 92.3% of total capital.

Europe produced 9 transactions, equal to 21.4% of the dataset, but raised only about $487.2M, or 6.9% of capital. Its average round size is approximately $54.1M and its median is $24M.

North America's average round is approximately $209.6M and its median is $71M. The gap with Europe reflects the large US and Canadian financings supporting nuclear, fusion, batteries, geothermal and grid infrastructure.

Asia-Pacific contributed only 2 qualifying rounds and $54.5M in this strict sample. That is too little evidence to conclude that APAC lacks climate innovation; it mainly shows that the publicly disclosed pure-play dataset captures much less qualifying growth capital there.

For a broader geographic view of companies and capital flows, explore our Climate Tech market report by region and category.

Is the climate tech opportunity set broad or concentrated in one geographic hub?

As of September 2026, the disclosed climate tech opportunity set is geographically concentrated around North America over the requested 12 months. The region captures 73.8% of deals but 92.3% of disclosed capital.

Europe has meaningful company-level breadth with more than one-fifth of transactions, yet its capital share remains below 7%. The region therefore appears in the dataset as an active formation market but a much smaller source of growth-scale private financing.

Asia-Pacific represents 4.8% of disclosed deals and less than 1% of capital. Latin America, the Middle East and Africa have no qualifying verified transaction in the assembled dataset.

Those zeroes should not be interpreted as zero climate activity. Under strict pure-play, minimum-size and authoritative-source requirements, they are better treated as a visibility warning about what appears in publicly disclosed private-financing data.

Is climate tech a market of small experiments or scaled financings?

As of September 2026, the visible climate tech market is increasingly a market of scaled financings over the requested 12 months. Twenty-three of the 42 disclosed rounds are at least $50M, and the median transaction is approximately $54.5M.

No qualifying round falls below $5M. Eleven deals sit from $5M to below $20M, eight fall from $20M to below $50M, and 23 are $50M or larger.

The large-check pattern becomes more striking at the top. Twenty-two rounds are strictly above $50M and 14 are strictly above $100M, meaning one-third of all transactions clear the $100M threshold.

That does not mean the average climate startup can raise hundreds of millions. The $167.6M average is heavily distorted by billion-dollar and several-hundred-million-dollar financings, so company-specific capital intensity matters far more than the market-wide mean.

If you want more detail on round sizes, stages and the companies driving them, see our full climate tech funding report.

Who are the investors that appear the most in climate tech fundraising?

As of September 2026, repeat investors in the climate tech market cluster around energy, storage, grid infrastructure and scalable physical assets over the requested 12 months. Lowercarbon Capital appears in at least four qualifying financings, the highest minimum count in the reviewed source material.

B Capital, Energy Impact Partners, Activate Capital and Gigascale Capital each appear in at least three qualifying deals. Prelude Ventures, Breakthrough Energy Ventures, StepStone Group, Kibo Invest, Galvanize, Thrive Capital, Lightspeed Venture Partners, Coatue and BoxGroup each appear at least twice.

The portfolio pattern matters as much as the raw counts. Many repeat investors show up around storage, generation, grid infrastructure or closely related hard-tech systems rather than spreading evenly across all six climate tech categories.

Investor counts should be treated as minimums because several announcements do not publish complete syndicate lists. Round announcements also rarely disclose individual investor check sizes, so participation frequency is more reliable than trying to estimate dollars personally committed by each fund.

For more detail on the companies and investment themes behind these repeat appearances, see our climate tech investor and market analysis.

Who is the author of this content?

NEW MARKET PITCH TEAM

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