Cleantech funding hits $8B in Q2 2026, highest in two years; Stegra green steel leads with $1.6B
Cleantech and sustainability-focused startups attracted $8 billion in funding during Q2 2026, the highest quarterly total since 2024, according to Crunchbase data. For H1 2026, cleantech and EV categories received $15 billion across seed through growth-stage rounds, putting full-year funding on track to slightly exceed 2025 totals—which were the lowest in several years. Despite gains, cleantech funding remains far below its 2021–2022 peak and now accounts for a smaller share of total venture investment as AI dominates the landscape.
The largest 2026 roundsinclude Stockholm-based green steel producer Stegra's $1.6 billion Series round led by Swedish asset manager Wallenberg Investments, and Jeff Bezos-backed Slate Auto's $650 million Series C for an electric pickup starting at $25,000. Fusion companies secured major checks: Helion Energy raised $465 million at a $15.5 billion post-money valuation, and Inertia Fusion nabbed $450 million for developing grid-scale fusion. Exit activity is picking up: Fervo Energy went public in May at $1.9 billion raised, and X-energy raised $1 billion in its April IPO.
For builders, the sector looks underfunded relative to the scale of opportunity: the IEA forecasts renewables and nuclear will reach 50% of global power mix by 2030, with power demand growing 3.5% annually. The architectural takeaway is threefold: (1) fusion and advanced nuclear remain venture-scale but increasingly credible capital recipients, (2) electrification capex decisions in enterprise tech now correlate with AI data center cooling and power costs, and (3) the venture bar for cleantech remains higher than AI despite greater structural demand growth.