Top Energy Startups in 2027

Boom Supersonic is the Denver-based startup bringing supersonic flight back to the skies with Overture. As the world’s fastest airliner, Overture is designed and committed to industry-leading standards of speed, safety and sustainability. Flights twice as fast as today’s commercial airplanes, means we can go twice as far—bringing more people, places, and cultures into our lives. Boom is the first commercial airplane manufacturer to commit to a carbon-neutral flight test program and to build sustainability into its entire aircraft program. Founded in 2014, Boom has assembled a team of over 140 full-time employees who have made contributions to over 220 air and spacecraft programs. Are you passionate about building the future of transportation? Help us make aviation history.

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 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.

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.

To reach Net Zero, the U.S. needs between 200-400 gigawatts of grid-scale energy storage by 2050, requiring over $1 trillion dollars in investment. Tierra Climate is an innovative technology company dedicated to unleashing the decarbonization potential of grid-scale energy storage. We’re pioneering a new category of environmental attributes for energy storage that will enable sustainability-minded companies to financially support emissions-reducing energy storage. In short, we help companies pay batteries to clean the electricity grid. We’ve raised $1.6 million in funding and plan to double our team to support our growth. Learn more about our mission here in our recent podcast interview with David Roberts on Volts: volts.wtf/p/grid-scale-batteries-do-not-currently#details

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.