Top Clean Energy Startups in 2027

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.

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.

We believe people are at their best when they’re living free from the burden of energy costs. The sun is the energy source of all life on earth, yet humanity captures almost none of what if offers. To close that gap, Optivolt builds solar systems that think — designed with aerospace power electronics inside to make solar more powerful, reliable, and cost effective than ever. Optivolt's Breakthrough: We realized deep integration between solar panels and power electronics unlocks an entirely new design space for innovation. This led us to inventing the Power Balancer (19 patents issued, 27 pending), an advanced power electronics device which embeds inside solar panels. Balancers work by shuffling power from stronger to weaker zones in the panel to keep power flowing, maximizing energy output and reliability. Performance vs. $8B market leader: • Up to 6x higher power output in real-world conditions • 40% lower equipment cost, 50% faster to install • 4x less failure points, while eliminating hotspots (#1 solar failure mode) Optivolt's development is funded in part by the U.S. Department of Energy.

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.

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.

Arcadia is a fast-growing technology company that is revolutionizing the utility industry. At Arcadia, we’re guided by a common purpose: We believe in a future that is powered by 100% renewable energy. Our team is building the utility of the future - one that breaks down the barriers to clean energy access and puts customers first. Arcadia users all over the country choose clean energy, save with solar power, lower their utility bills and track their impact every day. We make choosing clean energy easy for everyone.

Our predictive SaaS platform utilizes historical and real-time big data within dynamic power market environments, enabling the execution of multi-dimensional models for rapid and ongoing decision-making.

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.

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.