MentionFox lists 300 Energy companies. Of them, 95 are Y Combinator companies (the newest batch here is Fall 2026, with 4); 182 filed a Form D notice with the SEC; 23 won an SBIR or STTR award.
Companies300
Y Combinator95
Form D filers182
SBIR/STTR winners23
By year
- 2026: 206 companies (21 Y Combinator, 179 Form D filers, 6 SBIR/STTR winners); median amount sold $3M across 173 Form D notices
- 2025: 20 companies (5 Y Combinator, 1 Form D filer, 14 SBIR/STTR winners)
Energy startups from other years
Companies from before 2020, or from a year with fewer than 15 of them. Every other year has its own full list, linked above.
| Company | What it does | Date | Amount | Round / stage | Record |
|---|---|---|---|---|---|
| PC Krause & Associates Inc | Topic n171-075 submarine shipboard power supply bridge | Award starts Dec 20, 2024 | $1.8M | SBIR Phase II | Federal award record |
| Vista Photonics, Inc | Manufacture and delivery of compact, battery powered, optical sensor flight units for detecting combustion products and ammonia, known… | Award starts Nov 12, 2024 | $2.5M | SBIR Phase III | Federal award record |
| United Protective Technologies, LLC | Small business innovation research (sbir), topic# a20-147, "light-weight internal-combustion high-power, transformative, novel,… | Award starts Oct 21, 2024 | $2M | SBIR Phase II | Federal award record |
| Curo | Electric fleets park and charge anywhere with Curo | Fall 2024 | Y Combinator batch | Y Combinator listing | |
| autarc | autarc is the agentic OS for energy installers. | Summer 2024 | Y Combinator batch | Y Combinator listing | |
| Ionworks | Simulation software used by leading battery and automotive companies | Summer 2024 | Y Combinator batch | Y Combinator listing | |
| Plume | Renewable infrastructure deployment at scale. | Summer 2024 | Y Combinator batch | Y Combinator listing | |
| Silurian | Foundation models to simulate Earth, starting with weather. | Summer 2024 | Y Combinator batch | Y Combinator listing | |
| Spark | AI-powered workflows for energy infrastructure | Winter 2024 | Y Combinator batch | Y Combinator listing | |
| Vista Power | Batteries and solar for $0 upfront to help businesses save money | Winter 2024 | Y Combinator batch | Y Combinator listing | |
| dili | Automating Compliance for Construction | Summer 2023 | Y Combinator batch | Y Combinator listing | |
| Electric Air | Tech-enabled heat pump contractor that cuts costs by 60% | Summer 2023 | Y Combinator batch | Y Combinator listing | |
| HyLight | Unmanned airships for inspecting our critical assets | Summer 2023 | Y Combinator batch | Y Combinator listing | |
| Nectar | Manage energy cost & usage with AI for facility & sustainability teams | Summer 2023 | Y Combinator batch | Y Combinator listing | |
| Rimward | Solar farm security software for existing cameras | Summer 2023 | Y Combinator batch | Y Combinator listing | |
| Atmeto | Building a frontier world model for power | Winter 2023 | Y Combinator batch | Y Combinator listing | |
| Coperniq | Workflow software for solar & energy contractors ☀️😎 | Winter 2023 | Y Combinator batch | Y Combinator listing | |
| Ruuf | Managed marketplace for solar in Latam | Winter 2023 | Y Combinator batch | Y Combinator listing | |
| Stralis Aircraft | Emission free hydrogen electric aircraft | Winter 2023 | Y Combinator batch | Y Combinator listing | |
| Boston Materials, Inc. (funding history) | Filed Dec 29, 2022 | $2M | SEC Form D | ||
| Ridgeline Royalties Inc | Filed Dec 29, 2022 | $1.3M | SEC Form D | ||
| Evoly | Smart electric & water meters as a service | Summer 2022 | Y Combinator batch | Y Combinator listing | |
| MaverickX | Engineering the future of chemistry for natural resource extraction | Summer 2022 | Y Combinator batch | Y Combinator listing | |
| Paces | Agentic AI for Power Projects and AI Infrastructure | Summer 2022 | Y Combinator batch | Y Combinator listing | |
| Wand Solar | We enable landlords to generate income from solar panels. | Summer 2022 | Y Combinator batch | Y Combinator listing | |
| Axross Pte Ltd | AI-driven HVAC control system for improved energy performance | Winter 2022 | Y Combinator batch | Y Combinator listing | |
| Beyond Aero | First electric business aircraft designed for hydrogen propulsion | Winter 2022 | Y Combinator batch | Y Combinator listing | |
| Impossible Metals | Underwater robotic vehicles that collect battery metals responsibly | Winter 2022 | Y Combinator batch | Y Combinator listing | |
| Nira Energy | Software to find the best sites for renewables on the electrical grid | Winter 2022 | Y Combinator batch | Y Combinator listing | |
| Posh | Rapidly deployable energy solutions for modern commercial and… | Winter 2022 | Y Combinator batch | Y Combinator listing | |
| SmartHelio | Software to prevent downtime in a solar plant | Winter 2022 | Y Combinator batch | Y Combinator listing | |
| Charge Robotics | Robots that build solar farms | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| Endla | Software that increases the value of oil & gas wells | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| Enerjazz | Making electric vehicle batteries affordable | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| Ferveret | Nuclear-inspired cooling that turns wasted power into more AI compute | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| Kapacity.io | Reducing energy costs & emissions in buildings. | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| Matidor.com | Project management on a live map | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| Pylon | Infrastructure management software for water & electricity companies | Summer 2021 | Y Combinator batch | Y Combinator listing | |
| Aurabeat | Providing clean, safe, virus free air for homes, buildings and cars | Winter 2021 | Y Combinator batch | Y Combinator listing | |
| Enode | Energy Orchestration Platform | Winter 2021 | Y Combinator batch | Y Combinator listing | |
| Gridware | Protecting the grid today, preparing the grid for tomorrow | Winter 2021 | Y Combinator batch | Y Combinator listing | |
| inBalance | Electricity price forecasts for energy storage, ev charging, etc. | Winter 2021 | Y Combinator batch | Y Combinator listing | |
| Shepherd | Modernizing commercial insurance | Winter 2021 | Y Combinator batch | Y Combinator listing | |
| Zitara Technologies, Inc. | Predictive battery management software for electrified fleets | Summer 2020 | Y Combinator batch | Y Combinator listing | |
| Atmo | Ultra-precise AI weather forecasting. | Winter 2020 | Y Combinator batch | Y Combinator listing | |
| PowerX | AI powered sensors that save energy, water and emissions | Winter 2020 | Y Combinator batch | Y Combinator listing | |
| Gaiascope | SaaS that helps renewables & energy storage operate more profitably | Summer 2019 | Y Combinator batch | Y Combinator listing | |
| Kitekraft | Building flying wind turbines. | Summer 2019 | Y Combinator batch | Y Combinator listing | |
| Vorticity | The Fastest Scientific Computing Platform on the Planet | Summer 2019 | Y Combinator batch | Y Combinator listing | |
| Intelline | Intelline makes the world's most efficient fuel agnostic engines for… | Winter 2019 | Y Combinator batch | Y Combinator listing | |
| Maple Materials | We turn CO2 into battery-grade graphite and oxygen. | Winter 2019 | Y Combinator batch | Y Combinator listing | |
| Prometheus | We use solar and wind power to make zero net carbon electrofuels | Winter 2019 | Y Combinator batch | Y Combinator listing | |
| Valo | Cutting edge hydrofoil systems for boatbuilders | Winter 2019 | Y Combinator batch | Y Combinator listing | |
| Tenderd | AI Platform for Efficient and Sustainable Operations | Summer 2018 | Y Combinator batch | Y Combinator listing | |
| Aerones | Robotics for wind turbine maintenance. | Winter 2018 | Y Combinator batch | Y Combinator listing | |
| Look After My Bills | Personal fintech - we optimise your bills, every year, automatically. | Winter 2018 | Y Combinator batch | Y Combinator listing | |
| Advano | Advano is a battery technology company that improve the longevity of… | Summer 2017 | Y Combinator batch | Y Combinator listing | |
| Airthium | Decarbonized heat and power cheaper than fossil fuels | Summer 2017 | Y Combinator batch | Y Combinator listing | |
| Fiix | Fiix sends expert auto mechanics to your home, so you don’t have to… | Winter 2017 | Y Combinator batch | Y Combinator listing | |
| Nuvola | Nuvola is transforming battery manufacturing, making EV batteries… | Winter 2017 | Y Combinator batch | Y Combinator listing | |
| Tizeti | ISP for Africa | Winter 2017 | Y Combinator batch | Y Combinator listing | |
| Raptor Maps | Raptor Maps builds software to manage the solar PV lifecycle. | Summer 2016 | Y Combinator batch | Y Combinator listing | |
| Validere | A carbon MRV solution for energy and hard-to-abate sectors | Summer 2016 | Y Combinator batch | Y Combinator listing | |
| Yoshi Mobility | Making car ownership and management frictionless. | Summer 2016 | Y Combinator batch | Y Combinator listing | |
| Astranis | Advanced satellites for high orbits. | Winter 2016 | Y Combinator batch | Y Combinator listing | |
| MineralSoft | Data management platform for oil & gas assets | Winter 2016 | Y Combinator batch | Y Combinator listing | |
| Soundboks | We're creating the loudest battery-driven speaker on the market | Winter 2016 | Y Combinator batch | Y Combinator listing | |
| Oolu | Oolu is one of the fastest growing off-grid solar firms in West Africa | Summer 2015 | Y Combinator batch | Y Combinator listing | |
| Reach | Long range, wireless energy distribution that scales | Summer 2015 | Y Combinator batch | Y Combinator listing | |
| Thrive Agritech | We design and manufacture energy efficient LED lighting fixtures for… | Summer 2015 | Y Combinator batch | Y Combinator listing | |
| Bright | Sunrun for the developing world | Winter 2015 | Y Combinator batch | Y Combinator listing | |
| Zeitview | Inspection software for renewable energy & sustainable infrastructure | Winter 2015 | Y Combinator batch | Y Combinator listing | |
| Helion Energy | Building the world's first fusion power plant | Summer 2014 | Y Combinator batch | Y Combinator listing | |
| GBatteries | Enabling li-ion batteries to charge ultra fast without compromising… | Winter 2014 | Y Combinator batch | Y Combinator listing |
Selling to these companies?
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Figures come only from the record linked in each row; a blank means the record gives none. How these lists are built.