Introduction

The MIT Technology Review's annual Climate Tech Companies to Watch list returns for 2026, casting a spotlight on the most promising firms advancing climate and energy innovation. From wind giants to next-generation batteries, the selection reflects where the sector is headed.

What Happened

This year's list features companies across China, the United States, and beyond, spotlighting wind and solar scaling, advanced battery chemistry, next-generation geothermal and nuclear projects, and grid-scale storage solutions. Notable entries include Envision Energy's massive wind and storage footprint, WeLion New Energy's ultra-high-density lab results, Fervo Energy's geothermal push, and X-energy's small modular reactor development.

Why This Matters

With energy demand surging driven by AI data centers and industrial decarbonization, these companies represent the frontlines of the transition away from fossil fuels. Their technologies aim to make clean energy more reliable, affordable, and scalable, directly supporting global climate goals.

Key Takeaways

  • China's renewable surge: Envision Energy has installed over 100 gigawatts of wind power worldwide and is expanding into Germany, Brazil, and Australia.
  • Next-gen batteries: WeLion New Energy achieved over 800 watt-hours per kilogram in lab tests, pushing solid-state and semi-solid-state development forward.
  • Next-generation geothermal: Fervo Energy is using horizontal drilling and hydraulic fracturing to bring clean firm power to more regions, with a goal of a gigawatt of plants by 2030.
  • Small modular nuclear: X-energy is building helium-cooled reactors in collaboration with Amazon, with a 320-megawatt cluster planned for Richland, Washington.
  • Grid-scale storage: Form Energy's iron-air batteries aim for a 30 gigawatt-hour project to power a Google data center, while Energy Dome's compressed CO2 storage offers longer-duration, lower-cost alternatives.
  • Second-life EV batteries: Moment Energy repurposes used electric vehicle batteries for backup power in Vancouver, British Columbia.

Conclusion

The 2026 climate tech watchlist demonstrates that innovation is accelerating across multiple fronts. While challenges remain, the featured companies show tangible progress toward a cleaner, more resilient energy future, making them worth watching in the years ahead.