As the world accelerates its transition to sustainable energy sources, innovative startups are emerging as key players in shaping the future of renewable energy. These companies are pushing the boundaries of technology and business models to address critical challenges in clean energy production, storage, and distribution. From advanced battery technologies to novel approaches in carbon capture and sustainable investing, these are the top renewable energy startups to watch this year.
Top Renewable Energy Companies to Watch
Every year, new startups pull to the forefront of their industry through exciting innovation and industry-disrupting business models. We’ve rounded up the most exciting renewable energy startups of 2025 that startup-lovers, investors, and aspiring entrepreneurs should follow.
Disclaimer: With so many exciting startups launching and growing worldwide, we aren’t able to cover them all. Furthermore, the startups that are listed below aren’t officially ranked and are listed in no particular order.
1. Gaussion
- Location: London, England
- Founder(s): Dr. Thomas Heenan, Dr. Chun Tan
- Founded In: 2017
- Funding: Series A, $15.6 Million
- Investors Include: Autotech Ventures, AlbionVC, BGF
Gaussion is focused on developing advanced battery technology for electric vehicles (EVs) and energy storage systems. The company works on innovative cathode materials and cell designs to improve battery performance, energy density, and charging speeds. Gaussion’s goal is to create batteries that can significantly extend the range of EVs and enhance the efficiency of renewable energy storage, potentially accelerating the global transition to sustainable energy.
2. Heimdall Power
- Location: Oslo, Norway
- Founder(s): Brage Johansen, Marie Højvig, Anders Skånlund
- Founded In: 2016
- Funding: Series B, $53.7 Million
- Investors Include: Orlen, NRP Zero, Sarsia Seed
Heimdall Power provides real-time monitoring and analytics for power grids. The company’s technology uses sensors and artificial intelligence (AI) to optimize grid operations, predict failures, and increase the capacity of existing power lines. By providing grid operators with detailed, real-time insights, Heimdall Power aims to reduce energy waste, prevent outages, and enable more efficient integration of renewable energy sources into the existing power infrastructure.
3. H2GO Power
- Location: London, England
- Founder(s): Dr. Enass Abo-Hamed, Dr. Luke Sperrin, Jonathon Blackburn
- Founded In: 2014
- Funding: Accelerator/Incubator, $3.39 Million
- Investors Include: Urban Future Lab, Innovation Council Fund, Enterprise Hub – Royal Academy of Engineering
H2GO Power is making strides in energy storage — particularly hydrogen. Hydrogen is typically stored in large, high-pressure tanks capable of withstanding up to 10,000 pounds per square inch (PSI). H2GO Power Cofounder Dr. Enass Abo-Hamed discovered a more compact storage solution while studying for her doctorate at Cambridge that’s capable of keeping hydrogen in a lighter, safer space.
4. INTI-TECH
- Location: Santiago, Chile
- Founder(s): Nicolás Correa Ojeda, Camilo Garrido, Camilo Contreras, Mauricio Castillo
- Founded In: 2016
- Funding: Accelerator/Incubator, $1.14 Million
- Investors Include: Lorentzen Investments, Alaya Capital, Albi Investments
INTI-TECH has created a Hardware as a Service (HaaS), high-frequency cleaning solution for photovoltaic (PV) plants. The company’s water-free, autonomous robots are cheaper and more effective than traditional cleaning methods and require less staffing. The technology can clean on-demand and weekly at small-scale power plants while larger-scale plants can get customized solutions. The robots are designed for desert and semidesert areas.
5. C-Zero
- Location: Santa Barbara, California
- Founder(s): Zachary Jones
- Founded In: 2020
- Funding: Series A, $50.6 Million
- Investors Include: AP Ventures, SK Gas, ENGIE New Ventures
C-Zero develops technology to produce clean hydrogen from natural gas without CO2 emissions. The company’s process — called methane pyrolysis — splits methane into hydrogen and solid carbon, potentially offering a more cost-effective and scalable method of hydrogen production compared to electrolysis. This approach could play a crucial role in the transition to a hydrogen economy, providing a bridge between current fossil fuel infrastructure and future renewable energy systems while significantly reducing greenhouse gas emissions.
6. Cloover
- Location: Stockholm, Sweden
- Founder(s): Peder Broms, Jodok Betschart, Valentin Gönzcy, Tony Kirmo
- Founded In: 2022
- Funding: Seed, $121 Million
- Investors Include: Broadhaven Ventures, Lowercarbon Capital, 9900 Capital
Cloover partners with renewable energy professionals to deliver affordable, sustainable home enhancements. By embedding finance options, more homeowners are able to switch to renewable energy sources like solar power and heat pumps with a lower barrier of entry financially.
7. Torus
- Location: Salt Lake City, Utah
- Founder(s): Nate Walkingshaw, Gilbert Lee
- Founded In: 2021
- Funding: Series A, $67 Million
- Investors Include: ICONIQ Capital, Convoi Ventures, EPIC Ventures
Torus manufactures and sells hybrid battery systems that are more powerful and longer lasting than chemical batteries or backup generators. The Torus system includes the company’s innovative battery as well as software with real-time monitoring, smart storage features, and cost-saving predictions to ensure customers receive the maximum benefit from their system.
8. Climatize
- Location: Santa Cruz, California
- Founder(s): Will Wiseman, Alba Forns
- Founded In: 2019
- Funding: Pre-Seed, $1.75 Million
- Investors Include: Techstars, Myriad Venture Partners, Climate Capital
Climatize offers a mobile app designed to help individuals take action against climate change while potentially earning returns on their investments. The app allows users to invest directly in local solar projects and energy efficiency upgrades for multi-tenant buildings as well as a broader range of climate solutions. Unlike traditional carbon credits, Climatize provides greater transparency about project locations, community impacts, and potential environmental benefits. By combining climate action with investment opportunities, Climatize aims to empower individuals experiencing climate anxiety to make tangible contributions to sustainability efforts while also potentially benefiting financially.
9. Exeger
- Location: Stockholm, Sweden
- Founder(s): Giovanni Fili
- Founded In: 2009
- Funding: Debt Financing, $249 Million
- Investors Include: SoftBank Group, Qualcomm Ventures, 3T Invest
Exeger manufactures flexible solar cell technology that converts all forms of light into energy. The technology can then be used to power small gadgets, such as wireless headphones or a self-charging bike helmet with light. The company’s goal is to produce items that billions of people can use in everyday life within the next decade.
10. Peak Energy
- Location: Denver, Colorado
- Founder(s): Landon Mossburg, Liam O’Connor, Cameron Dales
- Founded In: 2023
- Funding: Series A, $65 Million
- Investors Include: TDK Ventures, Eclipse, Doral Tech Ventures
Peak Energy develops innovative energy storage solutions to address the intermittency challenges of renewable energy sources. The company aims to industrialize sodium-ion in an effort to lower energy storage costs and accelerate grid decarbonization. Peak Energy’s solutions aim to enable greater integration of renewable energy into power grids by providing reliable storage capacity during peak demand periods.
11. 3V Infrastructure
- Location: Tottenham, Canada
- Founder(s): Aubrey Gunnels, Benjamin Kanner
- Founded In: 2008
- Funding: Private Equity, $40 Million
- Investors Include: Greenbacker Capital Management
3V Infrastructure specializes in financing, owning, and operating Level 2 EV chargers for various types of properties. The company’s business model focuses on partnering with property owners of multifamily housing complexes, hotels, medical facilities, and other similar establishments to provide EV charging solutions. By taking on the financial and operational responsibilities of EV chargers, 3V Infrastructure enables property owners to offer this amenity to their tenants, guests, or customers without the associated costs and management burdens.