69 Best Renewable Energy Startups to Watch in 2025

Caban Systems is a Burlingame, California-based renewable energy and energy storage company developing modular energy storage platforms for critical infrastructure power needs.

Urban Electric Power is a Pearl River, New York-based developer of a zinc manganese dioxide battery technology. The company was spun out of the CUNY Energy Institute in 2013.

Commonwealth Fusion Systems is a Cambridge, Massachusetts-based research and development company developing fusion power systems based on ARC tokamak reactors.

LevelTen Energy provides a clean energy procurement platform for midsize businesses and enterprises.

Blue Origin is an American, privately-funded, aerospace developer and manufacturer that is interested in lowering the cost of spaceflight in order to explore the solar system

Viridos is applying synthetic biology to microalgae for the production of products that address climate change and sustainability. Viridos is focused on producing algal biofuels and other sustainable resources from algae.

Membrion is a Seattle-based clean technology company and developer of flexible ceramic ion exchange membranes capable of being used in wastewater cleaning and in energy storage solutions.

Developer and manufacturer of systems for renewable industrial gas and fuel production.

NEXT Energy Technologies is a Santa Barbara, California-based developer of photovoltaic coatings for window.

Pavegen is a London-based company founded by Laurence Kemball-Cook.

DroneDeploy is a cloud-based software that allows drones to take images and 3D models at any altitude.

Enervee is a company founded in 2010 by Hjalmar Branting, Iker Casillas, Aoife Ní Fhearraigh, Yhonastan Fabian, The Sxplay, Ujiie Naotomo, Robbie Grossman, Ingrid Gfölner, Moisey Uretsky, Don Epperson, Matt Service FBCS and Bhavesh M. Mehta.

An nanotechnology company with focus on developing solar products. It was founded in 2002 and closed in 2013.

iUNU is a Seattle-based agricultural tech startup founded in 2013.

VALOREM is a Bègles-based renewable energy company founded in 1994.

Coreshell Technologies is engineering liquid-deposited nanolayer coatings for Lithium Ion Batteries.

Nori is a company that hosts an open-source, blockchain-based market for purchasing carbon offsets.

Capturing CO2 from the sky and re-selling it for 2x cheaper

A carbon sequestration technology and bioplastics company based in Huntington Beach, California, founded in 2003, that uses their technology to capture carbon from greenhouse emissions for production of bioplastics.

Liquid Light is a developer of technology to convert carbon dioxide to a variety of chemicals, fuels, and other compounds.

Carbon Engineering is building technologies to capture CO2 directly from the atmosphere, and to use that CO2 in the synthesis of clean transportation fuels that displace crude oil.

Carbon Recycling International is a Kópavogur-based carbon capture company producing methanol for use as an alternative fuel source.

DroneSeed is a Seattle-based company that provides automated reforestation services.

All Power Labs is a Berkeley, California-based biogas company developing biogas generators for distributed energy needs.

Zeno Power Systems is an Arlington, Virginia-based developer of a radioisotope power system intended to convert heat from recycled nuclear waste into electricity.

NovaSolix is developing rectifying carbon nanotube antennas that convert light to electricity from the entire solar spectrum as a method of producing clean and inexpensive energy.

BluWave-ai is an Ottawa-based developer of software-as-a-service applications for optimization of sustainable and affordable energy systems and decisions.

ZEG Power is a developer of modular energy generation technology, including hydrogen fuel production with carbon capture and storage systems to produce clean hydrogen with no emissions.

Aurora Solar is a San Francisco-based developer of solar design, proposal, and sales software.

An industrial biotechnology company that produces chemicals from renewable non-food sources

SkySpecs is a company founded in 2012 by Daniel Ellis.

SeeO2 Energy Inc. is a Calgary-based carbon capture and storage company converting capture carbon dioxide into fuels and chemicals.

Juhudi Kilimo provides asset financing, technical assistance, and business training services to farmers and agro businesses in Kenya.

Alliance BioEnergy is a company founded in 2007.

Skeleton Technologies is a Tallinn-based energy storage company developing energy storage technology and solutions.

Pexapark AG is a blockchain company founded in 2017 by Michael Waldner, Florian Müller and Luca Pedretti.

Form Energy develops and commercializes a low-cost battery system that can store wind and solar energy for a long duration.

Oxford PV is a London-based developer of perovskite thin-film solar cells.

Eavor Technologies Inc. is a Calgary-based geothermal technology company.

BrightSource Energy is an Oakland, California-based company founded in 2006 by Arnold Goldman.

Enerkem is a Quebec-based company producing biofuels and renewable chemicals made from non-recyclable waste.

On a mission to stop climate change by making it easy and profitable for building owners to cut carbon emissions caused by wasted energy.

A biotechnology company using microbiology and chemistry to produce consumer goods and industrial products.

Modular and compact unit that provides renewable energy and clean water in remote areas.

Primus Power is an Hayward, California-based zinc bromine flow battery manufacturer.

A technology company developing a tethered electric aircraft to produce energy from the wind.

We make energy fair, smart and green - one flexible monthly plan with no hidden fees, digital-first and 100% renewable energy.

Choose Energy is a Texas-based marketplace company offering clean technology and service to help consumers shopping for electricity and natural gas rates.

Involt is a company developing supercapacitor-based solutions for batteries founded in 2012.

Miasolé is a thin-film solar producer founded in 2004.

R&D lab focused on energy, manufacturing, & innovation.

Echion Technologies is a supplier of niobium-based anode materials founded in 2017 by Jean de La Verpillière, Alex Groombridge, Adam Boies and Michael De Volder.

D.light Design is a Berkeley, California-based company founded in 2007 by Sam Goldman, Ned Tozun and Adrian Bock.

Highview Power is a company that provides CRYOBattery which delivers a clean and long-duration energy storage to enable a 100% renewable energy future.

Enevate Corporation is a developer of energy storage technology for lithium-ion battery ecosystems.

ZOLA Electric designs, manufactures, installs and sells solar backed systems for homes mainly in the rural and off-grid areas in Africa.

Borrego Solar Systems is a El Cajon, California-based developer and operator of commercial, residential, and public sector grid connected solar electric systems.

A company replacing chemical pesticides with plant based products.

Perceptual Robotics is an industrial automation company based in Bristol.

Hive Power is an AI-powered energy optimization software provider founded in 2017 by Gianluca Corbellini, Davide Rivola, Davide Strepparava, Lorenzo Nespoli and Vasco Medici.

Ubiquitous Energy is a Redwood City, California-based company founded in 2011 by Miles Barr.

BladeInsight is a company with the commitment to allying powerful technological solutions with blade expertise for tailored industry-focused solutions.

Virent Energy Systems is a Madison, Wisconsin-based renewable fuel source company.

Tigo Energy builds hardware and software intelligence into solar energy installations, making them more efficient, more manageable, and safer.

Electron is an Entech company that is aiding the transition to Net Zero. Electron offers transformative solutions that are available to all energy market participants.

NexWafe GmbH is a wafer company.

Developer of an energy storage technology designed to fight climate change using carbon dioxide (CO2) to accelerate the transition to renewable energy. The company's technology is based on a thermodynamic transformation of CO2 a closed-loop process to store energy and make renewable power dispatchable.

Sunfolding is a San Francisco-based solar tracking company developing and building infrastructure for solar farms

Aceleron is a clean technology company that aims to empower global communities by increasing access to energy storage solutions for its customers.