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.

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.

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.

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.

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.

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.

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.

Ohmconnect is a software based power plant. Instead of turning on a dirty coal or gas power plant during times of peak demand, Ohmconnect has hundreds of users reduce their electricity. Best part is that instead of paying dirty gas power plants to turn on, ohmconnect can pay its users to turn down. When users sign up, they are told when to reduce their electricity. If they participate, their energy reductions can be sold into the markets as additional generation. Ohmconnect hooks into users' wifi thermostats, electric cars, and smart devices to automate these reductions. Our users are presented with a clean visualization of where their energy is coming from and where their energy is going. For each event that they participate in, they earn Ohmconnect points which can be cashed out at any time.

Amperon is the leading analytics and forecasting company for the energy transition. We are venture-backed with support from leading venture and strategic investors who deeply understand energy and software. We are experiencing rapid growth on the back of a killer product that delivers compelling value for energy market participants on both the supply (power & utilities companies) and demand (large energy users) sides of the market. The company is 6 years old, with co-founders that have fused the best-of-breed from the energy (power trader at leading power generators and financials) and technology (data science and engineering at scaling tech companies) industries into a high-performance culture, with the following core values: • We fill in the blanks • We are reliable • We are customer-aligned • We are relentless • We do the hard things • We stay curious The company’s headquarters is Houston, TX, the energy transition capital of the world, but we operate as a highly effective distributed team, spread across the globe.