⚠ Summarised by AI based on an external source. Last updated: 15 May 2026. Starthubs is not liable for any inaccuracies. Always consult the official challenge information.
Third Derivative (D3) is a global climate tech accelerator founded by RMI and New Energy Nexus, with a portfolio that has collectively raised over a billion dollars since 2020. Its virtual, 18-month programme connects world-changing climate tech startups with a curated network of investors, corporate partners, mentors and the 700+ energy professionals at RMI. The programme is light-touch by design, with a dedicated Account Manager and tailored support — no equity is taken and exclusivity is not required. Applications are reviewed year-round, with multiple intakes.
What is Third Derivative looking for?
D3 backs hardtech climate innovations across a wide spectrum: efficient building cooling, heating and envelopes; lighting and appliances; advanced construction; batteries (new chemistry, BMS, manufacturing); electric transportation; vehicle efficiency; long-duration energy storage; renewable power generation; low-carbon grid hardware; carbon capture, utilisation and markets; methane capture; green hydrogen; renewable process heat; biofuels, synfuels and low-carbon chemicals; low-carbon steel and cement; computing efficiency; enabling software for grid and building energy management; and financing or project development innovations that unlock faster adoption. Founders working in adjacent areas are explicitly encouraged to apply. Selection focuses on climate impact, techno-economic pathway, ability to raise capital, fit for corporate partnerships and team strength. Full eligibility details are on the official Third Derivative website.
Who is this for?
- For-profit climate tech startups with a working prototype at TRL 4 or above
- Minimum of 2 full-time employees, no upper limit
- Open globally — Dutch and other European founders welcome
- English-language programme; professional proficiency required
- Both early and later-stage startups (Series A and beyond) considered — support is tailored per stage
- No basic science risk: technologies must be past lab-feasibility
The admissions process takes about three months from application to decision, with an initial review followed by two interviews including ecosystem and partner input.
What's in it for you?
- An 18-month virtual accelerator with flexible, tailored programming that meets the startup's current stage
- A dedicated Account Manager from day one, acting as a bridge to the D3 network
- Direct introductions to D3's corporate partners actively scouting for commercial pilots and deals
- Capital connections through D3's investor network — supporting fundraising readiness and follow-on rounds
- Access to RMI's 700+ energy professionals working across power, transport, buildings and industry on six continents
- Techno-economic analysis and market expertise to sharpen the path to commercialisation
- Alumni status after the 18 months, with continued access to most programming, network and resources
- No equity taken, no exclusivity required — founders are free to work with other accelerators, investors or partners