AI Infrastructure Surge Drives Climate Tech Funding Peak

Climate tech venture funding reached its strongest first half since 2022, with startups securing $26.1 billion in the first six months of 2026, according to data from investment tracker Currence reported by The Register. This represents a 55 percent increase year-over-year.

While the headline figures suggest broad growth, the capital is heavily concentrated in the infrastructure required to support the AI boom. Low-carbon datacenter developers accounted for 34 percent of all climate venture funding, a massive jump from 3 percent the previous year. Two specific deals—a $4.5 billion round for DayOne and a $2 billion Series C for Nscale—represented approximately one-quarter of all investment. This shift has pushed the "built environment" category to become the largest investment vertical in climate tech, overtaking "energy."

Currence notes that the nature of climate tech is expanding as datacenters drive demand for advanced nuclear, geothermal power, robotics, and long-duration energy storage. Funding for Earth observation has tripled to support AI training data, and robotics startups focused on simulation and foundational models raised nearly four times more than any other innovation category. Investors are also providing large early-stage checks to nuclear startups well before they are expected to produce electricity.

However, this surge is narrow. The Register reports that overall deal counts fell by 25 percent, and the ten largest rounds made up 42 percent of all investment. In contrast, carbon-related equity funding plummeted 61 percent, marking its weakest first half since 2020. Currence suggests that the concentration of capital into massive energy and datacenter projects is moving climate venture funding closer to the realm of infrastructure finance.