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
    Boom Supersonic IRL 9/10Series B$732M raised

    Boom Supersonic is a commercial airplane manufacturer that builds supersonic airliners designed for speed, safety, and sustainability.

    Backed by 8VC, American Express Ventures, Angel Collective Opportunity Fund📍 Centennial, United States
    94
    SP Score
  2. 2
    Accelerate Wind IRL 9/10Seed$2M raised

    Accelerate Wind provides wind energy generation for the commercial and industrial spaces.

    Backed by National Science Foundation, Techstars, Third Derivative📍 St Louis, United States
    84
    SP Score
  3. 3
    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
  4. 4
    illuminem IRL 9/10Seed$2M raised

    illuminem is the world's leading source of sustainability & energy information

    Backed by BlackWood Ventures, Spin Ventures, Techstars📍 London, United Kingdom
    77
    SP Score
  5. 5
    Reverion IRL 9/10Series A$81M raised

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

    Backed by European Innovation Council, SpinLab - The HHL Accelerator, Unternehmertum Venture Capital Partners📍 Eresing, Germany
    76
    SP Score
  6. 6
    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
  7. 7
    Palmer Energy Technology IRL 9/10Series A$7M raised

    Palmer Energy Technology manufactures Battery Energy Storage Systems automotive-grade concepts to stationary energy storage applications.

    Backed by Barclays Climate Ventures, FirstGroup, FirstGroup Energy📍 London, United Kingdom
    69
    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
    Sublime Systems IRL 9/10Venture$202M raised

    Sublime Systems develops technology to decarbonize cement-making.

    Backed by CRH Ventures, PRIME Coalition, US Department of Energy📍 Somerville, United States
    61
    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: August 2026.

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