Accelerator · United States
A nonprofit accelerator for cleantech startups that runs regional programmes across the US over five months. Teams pay a participation fee; regional and national winners share cash prizes and investment.
Status unknown
Verified 18 October 2026 · From the programme's own pages
Five-month programme of workshops, boot camps and webinars; the national academy, regional showcases and the global forum are in person and required. The 2026 programme ran 31 May to 25 August, with national finals in Boston on 20 to 22 October 2026.
Dates not published. Applications for the 2027 accelerator are not yet open. In 2026 the deadline was 6 April, with an early-bird deadline on 28 February.
Usual timing: Applications for the 2027 accelerator are not yet open. In 2026 the deadline was 6 April, with an early-bird deadline on 28 February.
Other accelerators that share a sector with Cleantech Open or run in the United States.
A climate investor and accelerator with offices in Honolulu, New York, Washington DC and San Francisco. Its Strategy Track serves pre-seed and seed teams; its Project Track funds first-of-a-kind projects for Series A and later.
Funding not published · equity not published
SOSV's hard tech programme in Newark, New Jersey, for pre-seed and seed hardware startups, with engineering labs and staff on site. SOSV invests up to US$550k on a pre-seed SAFE.
Funding not published · equity not published
An Anchorage nonprofit's eight-month deployment accelerator that pairs market-ready energy, transportation and industrial technology startups with Alaska industry experts and community partners to deploy in Alaska.
Funding not published · equity not published
Creative HQ's 12-week climate tech accelerator in Wellington for New Zealand startups, with a 2026 focus on clean and scalable energy; cohort 6 begins in October 2026.
Funding not published · equity not published
Pre-seed fund and accelerator for African climate adaptation and resilience startups, investing US$150,000 in cash plus US$50,000 in venture-building support, with follow-on at seed and Series A.
US$150k invested · equity not published
Amsterdam-headquartered investor and accelerator for purpose-driven founders in agrifood, energy and emerging tech, co-investing from early stage up to Series B. The AgriFood programme takes applications year-round.
Funding not published · equity not published
Send us your next dates and terms and we will update the listing from your own pages, free.