Top Clean Energy Startups in 2026

Aurora Solar develops cloud-based software that enables sophisticated solar PV engineering design, provides workflow management functionality, and facilitates sales and customer acquisition for solar installers and financiers. Our software is used to create over 200,000 solar projects a month across the US and around the world.

Oklo is a California-based company developing clean energy plants to provide emission-free, reliable, and affordable energy using advanced fission. Oklo is a fast-growing startup with a history of reliable funding and milestones for more than 5 years. Oklo’s first product is a microgrid scale powerhouse. The powerhouse can produce clean energy for decades without needing to refuel, and also has the capability to turn nuclear waste into clean energy. Oklo received a Site Use Permit from the U.S Department of Energy, demonstrated fabrication of its fuel, was awarded fuel from the Idaho National Laboratory, and submitted the first accepted advanced fission license application to the regulator. Oklo has been featured in Popular Mechanics, Wired, Architectural Digest, Hyperallergic, POWER Magazine, and has been the subject of a Harvard Business School case, and was featured in the documentary The New Fire, among many other features.

We save building owners money on their energy bills by managing their onsite energy assets (such as battery storage, HVAC controls, solar, cogeneration, and electric vehicles) intelligently and efficiently with our machine learning platform. Our position as a retail electricity provider allows us to unlock value streams to customers currently unavailable to them.

Omnidian’s award-winning teams have been protecting the large-scale residential solar portfolios of our fortune 1000 clients and now - the industry’s leading residential solar protection plan with a 95% performance guarantee is available to homeowners through select elite and premier dealers. in 2017, we were awarded the department of energy sunshot grant, which accelerates the development of highly impactful solar energy technologies.

Commonwealth fusion systems (cfs) was spun out of mit's plasma science and fusion center to leverage the decades of fusion research combined with the innovation and speed of the private sector. supported by the world’s leading investors in breakthrough energy technologies, the cfs team is uniquely positioned to deliver the fastest path to commercial fusion energy. cfs has assembled a world class team that includes experts in magnets, manufacturing and plasma physics dedicated to the mission of delivering clean, limitless fusion power to the world.

Aerones builds heavy-lift (max 440lbs payload) tethered drones for wind turbine cleaning, de-icing and applying hydrophobic coatings. Electricity and water is provided with a cable from the ground so the drone can fly for as long as needed. AI would be used to automate cleaning process.

At Rhythm Energy, we’re redefining what it means to power a home. Launched in 2021, we help Texans transition to 100% renewable energy through thoughtfully designed products that put customers in control. Our approach combines technology, transparency, and a customer-first mindset to create a smarter, more sustainable energy experience. But what really sets us apart is our people. We’re a multidisciplinary team of builders—engineers, product thinkers, data experts, creatives, and customer advocates—working together to solve complex problems in a simple, human way. We move fast, think independently, and care deeply about the impact of our work. Our mission is straightforward: make clean energy more accessible, intuitive, and valuable for everyday life. If you’re someone who likes building from the ground up, thrives in ambiguity, and wants your work to matter, you’ll fit right in. We’re always looking for people who bring curiosity, ownership, and a bias toward action.

We have pioneered the focus on creating accessible Electric Vehicle charging platforms and stations through our products, we've assisted a range of individuals, companies and sectors and continue to promote access to EV charging platforms.

We aggregate federal and state geospatial datasets and regulatory documents and build AI systems to give project developers and contractors automated spatial intelligence from site selection to permitting to project development across carbon sequestration, geothermal, hydrogen, and minerals projects.

Solar panel Installations