From carbon-negative biogas plants to freight rail decarbonization, these 10 climate tech and sustainability startups are among the most enterprise-ready on SwitchPitch. Ranked by IRL score, early-stage VC backing, and enterprise traction, they represent the clean energy and ESG solutions that large organizations are actively piloting in 2026.

  1. 1
    Gigaton IRL 10/10Series A$33M raised

    Gigaton is a climate technology company developing artificial intelligence to decarbonize energy-intensive industries.

    Backed by 2150, Blue Impact Ventures, Cambridge Enterprise Ventures📍 London, United Kingdom
    79
    SP Score
  2. 2
    Reverion IRL 9/10Series B$256M raised

    Reverion develops reversible and carbon-negative power plants using patented biogas technology for renewable energy.

    Backed by Allianz, European Innovation Council, SpinLab - The HHL Accelerator📍 Eresing, Germany
    77
    SP Score
  3. 3
    Optera IRL 9/10Series A$26M raised

    Optera is a leading carbon emissions management SaaS solution for organizations around the world.

    Backed by AngelList, Engage, Mucker Capital📍 Boulder, United States
    75
    SP Score
  4. 4
    Gravity IRL 9/10Series A$13M raised

    Gravity Climate offers a carbon management software platform for industrial businesses and their supply chains.

    Backed by Eclipse Ventures, Ansa Capital, Buoyant Ventures📍 San Francisco, United States
    74
    SP Score
  5. 5
    Storm4 IRL 9/10Series A$3M raised

    Storm4 is a specialist GreenTech recruitment marketplace, connecting organizations with the senior talent to drive their mission.

    Backed by Puffin Point📍 London, United Kingdom
    70
    SP Score
  6. 6
    Fair Supply IRL 8/10Series A$4M raised

    Fair Supply provides supply chain ESG risk analytics, modern slavery due diligence, and Scope 3 insights for companies and investors.

    Backed by Airtree Ventures, Tidal Ventures, Five V Capital📍 Sydney, Australia
    68
    SP Score
  7. 7
    Prozeal Infra IRL 8/10Series A$4M raised

    Prozeal Infra creates sustainable & pro-environment energy solutions for future generations.

    Backed by Alchemie Ventures, Spectrum Impact📍 Ahmedabad, India
    68
    SP Score
  8. 8
    CarbonEthics IRL 9/10Seed$2M raised

    CarbonEthics is an Indonesia-based developer of technology-enabled natural climate solutions.

    Backed by Spiral Ventures, Ecoxyztem, Intudo Ventures📍 Jakarta, Indonesia
    67
    SP Score
  9. 9
    Progressture Solar IRL 8/10Series A

    Cleantech Energy Solutions Provider specialising in solar energy

    📍 Kuala Lumpur, Malaysia
    63
    SP Score
  10. 10
    Massachusetts Clean Energy Center IRL 8/10Seed

    Massachusetts Clean Energy Center offers energy development and implementation services for cleantech businesses.

    Backed by Business Growth Center, Greentown Labs, North Shore InnoVentures📍 Boston, United States
    63
    SP Score

Methodology: Rankings are generated monthly from SwitchPitch's startup database using a composite 100-point score: IRL Score (35%) — SwitchPitch's Innovation Readiness Level measuring real enterprise adoption; Funding Stage (20%) — weighted toward Seed and Series A/B; Total Raised (15%) — log-scaled to reward meaningful early capital; Enterprise Client Traction (15%) — based on documented client counts; Tier-1 VC Backing (15%) — presence of top-decile investors. Last updated: November 2026.

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