AI Infrastructure Surge Drives Climate Tech Funding Spike

Climate tech venture funding reached $26.1 billion in the first six months of 2026, a 55 percent year-over-year increase, according to investment tracker Currence as reported by The Register. While the headline figure suggests broad growth, the capital is heavily concentrated in the infrastructure required to support the AI boom.

Low-carbon datacenter developers now account for 34 percent of all climate venture funding, a massive jump from 3 percent the previous year. Two specific deals—DayOne's $4.5 billion round and Nscale's $2 billion Series C—represented approximately one-quarter of all investment. This shift has caused the "built environment" category to grow more than eightfold, surpassing "energy" as the largest investment vertical in the sector.

Currence notes that the focus has shifted toward the "route to power," with AI's demand driving investment into geothermal power, advanced nuclear, robotics, and long-duration energy storage. Funding for Earth observation tripled to support AI training data, and robotics startups focused on simulation platforms and foundational models raised nearly four times as much as the next largest innovation category. Investors are also providing large early-stage checks to nuclear startups well before they are expected to produce electricity.

However, the surge is not universal. The Register reports that carbon-related equity funding plummeted 61 percent, marking its weakest first half since 2020. Additionally, the overall deal count dropped by 25 percent, with the ten largest rounds making up 42 percent of all investment. Currence suggests this concentration of capital is moving climate venture funding closer to the realm of infrastructure finance.