Chris Sacca’s VC firm is raising a second nuclear fusion fund 

Chris Sacca’s venture capital firm, Lowercarbon Capital, is raising a second fund dedicated to investing in nuclear fusion energy startups. This follows their initial $250 million fusion-focused fund launched in 2022. The firm has already backed prominent fusion companies such as Commonwealth Fusion Systems and Pacific Fusion. The renewed fundraising effort reflects ongoing optimism among climate-focused investors, including notable figures like Vinod Khosla, who believe that a commercial breakthrough in nuclear fusion is imminent due to recent technological advances. Despite the promise, building fusion reactors remains capital-intensive. For example, Commonwealth Fusion Systems raised $863 million earlier in 2025, following a $1.8 billion Series B round four years prior. Other fusion startups have also secured over $100 million in funding. While Sacca did not disclose the size of the new fund, sources indicate it is expected to surpass the first fund in scale, signaling continued strong investor interest in the potential of fusion energy.