Climate tech venture funding hit $26.1 billion in the first half of 2026, up 55% year over year, according to investment tracker Currence. But the surge is not a broad climate rally. Low-carbon datacenter developers alone captured 34% of all climate venture funding, up from just 3% a year earlier, with DayOne and Nscale raising a combined $6.5 billion. The built environment category overtook energy as the largest investment vertical, and Currence has expanded its definition of climate tech to include datacenter developers that rely primarily on clean power or make sustainability central to their business. The ripple effects are pushing money into long duration energy storage, advanced nuclear, geothermal, robotics, and earth observation startups. Early stage nuclear startups are drawing large checks years before they will generate electricity, betting on AI's long term appetite for power. However, carbon related equity funding fell 61% to its weakest first half since 2020, and overall deal count dropped 25% even as total funding surged. The ten largest rounds accounted for 42% of all investment, pushing climate venture funding closer to infrastructure finance. The pattern is clear: money is following AI infrastructure and clean power is the accidental beneficiary.
