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Climate and Deeptech Capital Flows

Climate tech equity rebounded 53% in 2025 while venture funding specifically fell. The divergence tells you where in the stack capital is actually going.

Key findings

  • Climate tech raised $77.3bn in private and public equity in 2025, up 53% — the first growth after three years of decline.
  • BNEF put climate-tech venture capital specifically at around $25bn, down from $31.7bn.
  • Early-stage investors' share of total funding fell from about 20% in 2021 to under 8%.
  • Global energy transition investment reached a record $2.3 trillion, up 8%.

A rebound that skipped early stage

Climate tech companies raised $77.3bn in private and public equity in 2025, up 53% year on year and ending three consecutive years of decline. On that measure the sector recovered decisively.

Venture capital specifically moved the other way. BloombergNEF put climate-tech VC at around $25bn for the year, down from $31.7bn. The recovery was concentrated in later-stage and public-market capital, not in the money that funds new companies.

The early-stage picture is starker still. Sightline data shows early-stage investors' share of total climate funding fell from roughly 20% in 2021 to under 8% — a structural shift rather than a cyclical dip. Average fund size also contracted, from $174m in 2024 to $160m in 2025.

Deployment versus invention

The wider context is that global energy transition investment reached a record $2.3 trillion in 2025, up 8%. Capital is flowing into the transition at unprecedented scale — but overwhelmingly into deploying technologies that already work, rather than into inventing new ones.

That distinction matters for founders. A market can be simultaneously the largest capital story of the decade and a difficult place to raise a seed round, because those two facts describe different parts of the stack.

One widely reported driver is competition for attention: several accounts attribute the early-stage climate pullback partly to investor focus shifting toward AI. That is a plausible reading of a correlation rather than a demonstrated cause, and it is worth holding loosely.

  • Climate tech equity, all sources: $77.3bn, up 53%
  • Climate tech venture capital: around $25bn, down from $31.7bn
  • Early-stage share of total: from ~20% in 2021 to under 8%
  • Global energy transition investment: $2.3 trillion, up 8%

What it implies for founders in the sector

The capital that grew is later-stage and infrastructure-shaped: it wants proven technology, contracted revenue and a deployment path. The capital that shrank is the kind that funds technical risk.

For early-stage climate and deeptech founders, that argues for taking non-dilutive and strategic sources seriously — grants, corporate partnerships, government programmes — not as a fallback but as a primary route through the stage where pure venture supply has genuinely contracted.

It also raises the evidentiary bar. When early-stage capital is scarce, the companies that raise are disproportionately those that can show a credible path to the later-stage capital that is abundant.

Sources

Photo: Unsplash.