The fight against climate change continues to spark innovation across industries, with startups at the forefront of transformative solutions.

From rethinking how we produce energy and fuel to finding creative ways to decarbonize agriculture and heavy industry, these companies are developing scalable, impactful technologies to address the planet’s most pressing challenges. This list highlights 15 climate tech startups to watch in 2025, spanning five continents and diverse sectors, showcasing the ingenuity and determination driving the transition to a sustainable future.

BYD

Founded: 1995

A global leader in electric vehicles, BYD continues to scale rapidly, outselling Tesla in fully battery-powered EVs and accelerating the global transition to sustainable transportation.

LanzaJet

Founded: 2020

CEO: Jimmy Samartzis

This U.S.-based company opened a facility capable of producing nine million gallons of alternative jet fuel annually, a significant step in reducing aviation emissions.

First Solar

Founded: 1999

CEO: Mark Widmar

A key player in solar manufacturing, First Solar launched a $1.1 billion factory in Alabama, with plans for another in Louisiana by 2025, reinforcing domestic solar supply chains.

Sublime Systems

Founded: 2020

Founders: Leah Ellis

This innovative startup is scaling its electrochemical cement production process, offering a lower-emission alternative to conventional cement manufacturing.

Solugen

Founded: 2016

Founders: Gaurab Chakrabarti & Sean Hunt

Operating a bio-based chemical factory in Houston, Solugen produces essential chemicals without fossil fuels, addressing the hidden climate challenges of industrial emissions.

Rumin8

Founded: 2021

CEO: David Messina

This Australian company develops supplements for livestock that significantly reduce methane emissions from cattle, a crucial step in mitigating agricultural greenhouse gases.

Pano AI

Founded: 2019

CEO: Sonia Kastner

Combining AI and camera technology, Pano AI improves early wildfire detection, helping mitigate the increasing threat of climate-driven wildfires.

Charm Industrial

Founded: 2018

CEO: Peter Reinhardt

Collaborating with the U.S. Forest Service, Charm converts forest waste into bio-oil, sequestering carbon by injecting it underground, creating a scalable carbon removal solution.

Pivot Bio

Founded: 2011

CEO: Chris Abbott

This startup replaces synthetic fertilizers with nitrogen-producing microbes, cutting emissions and runoff in agriculture while boosting crop productivity.

Masdar

Founded: 2006

CEO: Mohamed Jameel Al Ramahi

In partnership with Emsteel Group, Masdar leads the UAE’s green hydrogen pilot to produce sustainable steel, paving the way for decarbonized industrial sectors.

ENGIE

Founded: 2008

CEO: Catherine Fiamma MacGregor

By signing a 10-year PPA for the 40.5 MW Dama de Baza wind project in Spain, ENGIE advances renewable energy development and supports Spain’s climate goals.

Nostromo Energy

Founded: 2017

CEO: Yoram Ashery

Backed by a $305.5 million DOE loan guarantee, Nostromo is scaling IceBrick, a thermal energy storage system that enhances grid stability and renewable energy integration.

Oriana Power Ltd

Founded: 2013

Founder: Anirudh Saraswat

Committed to India’s green transition, Oriana Power plans to invest INR 10,000 crores in solar, green hydrogen, and energy storage across six locations in Rajasthan.

BlueOval SK LLC

Founded: 2022

CEO: Michael Adams

Supported by a $9.63 billion DOE loan, this joint venture will establish three EV battery plants, bolstering U.S. manufacturing and job creation in clean energy.

PG&E

Founded: 1905

CEO: Patti Poppe

With a $15 billion U.S. loan, PG&E is upgrading its grid infrastructure and enhancing climate resilience, ensuring energy security amid intensifying climate impacts.

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