# Y Combinator's Energy Investments: 30 Startups in Its Portfolio (2026) > The 30 Energy startups Y Combinator has backed, by stage: $1.7B raised between them. From the rounds we track; updated nightly. Source: https://millionrounds.com/portfolio-maps/y-combinator-energy-portfolio (Millionrounds; every figure on the page links to its filing or article) ## Pre-seed and seed 16 - [*S* Symphony](https://millionrounds.com/company/symphony) - [*P* Parity](https://millionrounds.com/company/parity) - [Maritime Fusion](https://millionrounds.com/company/maritime-fusion) - [Byterat](https://millionrounds.com/company/byterat) - [Elyos Energy](https://millionrounds.com/company/elyos-energy) - [Holy Grail](https://millionrounds.com/company/holy-grail) - [Zimi](https://millionrounds.com/company/zimi) - [Akiflow](https://millionrounds.com/company/akiflow) - [Salem Robotics](https://millionrounds.com/company/salem-robotics) - [Jaza](https://millionrounds.com/company/jaza) - [Green Graphite Technologies](https://millionrounds.com/company/green-graphite-technologies) - [Vista Power](https://millionrounds.com/company/vista-power) - [Telematica](https://millionrounds.com/company/telematica) - [Condor Energy](https://millionrounds.com/company/condor-energy) - [Voltic](https://millionrounds.com/company/voltic) - [Ionworks](https://millionrounds.com/company/ionworks) ## Stage not reported 7 - [Vesper Energy](https://millionrounds.com/company/vesper-energy) - [*AA* Apollo Atomics](https://millionrounds.com/company/apollo-atomics) - [Sonocharge Energy](https://millionrounds.com/company/sonocharge-energy) - [Gen2 Energy](https://millionrounds.com/company/gen2-energy) - [Yotta](https://millionrounds.com/company/yotta) - [Airthium](https://millionrounds.com/company/airthium) - [Calogy Solutions](https://millionrounds.com/company/calogy-solutions) ## Series A 3 - [Fleetzero](https://millionrounds.com/company/fleetzero) - [David Energy](https://millionrounds.com/company/david-energy) - [BluWave-ai](https://millionrounds.com/company/bluwave-ai) ## Series B 2 - [Gridware](https://millionrounds.com/company/gridware) - [Clever](https://millionrounds.com/company/clever) ## Series C and later 2 - [Helion Energy](https://millionrounds.com/company/helion-energy) - [UgoWork](https://millionrounds.com/company/ugowork) ## Segment by segment ### Pre-seed and seed 16 startups · $648M raised - [*S* **Symphony**](https://millionrounds.com/company/symphony) United States $599M - [*P* **Parity**](https://millionrounds.com/company/parity) Canada $23M - [**Maritime Fusion**](https://millionrounds.com/company/maritime-fusion) Maritime Fusion is a San Francisco-based alternative energy equipment company founded in 2024. United States $4.5M - [**Byterat**](https://millionrounds.com/company/byterat) Byterat is a modern cloud platform for battery data analytics. United States $4.0M - [**Elyos Energy**](https://millionrounds.com/company/elyos-energy) Elyos Energy is a software platform for energy optimization, flexibility, and demand response. United Kingdom $3.0M - [**Holy Grail**](https://millionrounds.com/company/holy-grail) Holy Grail is a technology company based in Mountain View, California, founded in 2019. United States $2.7M - [**Zimi**](https://millionrounds.com/company/zimi) Zimi is a South African company specializing in integrated electric vehicle (EV) charging and energy management solutions tailored South Africa $2.3M - [**Akiflow**](https://millionrounds.com/company/akiflow) At Akiflow we help users to manage their time wisely by offering an all-in-one productivity hub, where you can access and plan all United States $1.8M ### Stage not reported 7 startups · $374M raised - [**Vesper Energy**](https://millionrounds.com/company/vesper-energy) Vesper Energy creates utility-scale renewable energy projects that address today's energy challenges. United States $286M - [*AA* **Apollo Atomics**](https://millionrounds.com/company/apollo-atomics) United States $32M - [**Sonocharge Energy**](https://millionrounds.com/company/sonocharge-energy) Sonocharge Energy develops a technology that enables batteries to charge. United States $24M - [**Gen2 Energy**](https://millionrounds.com/company/gen2-energy) Gen2 Energy creates, runs, and manages a green hydrogen supply chain. Norway $17M - [**Yotta**](https://millionrounds.com/company/yotta) Yotta Data Services, part of Nidar Infrastructure Limited, is a leading provider of hyperscale data center and cloud infrastructure in India. United States $12M - [**Airthium**](https://millionrounds.com/company/airthium) Airthium is a French deeptech-greentech startup founded in March 2016, based in Villebon-sur-Yvette, near Paris. France $3.2M - [**Calogy Solutions**](https://millionrounds.com/company/calogy-solutions) Calogy Solutions is a thermal management and battery systems company focused on Li-ion batteries for electric transport, energy st Canada $1.1M ### Series A 3 startups · $82M raised - [**Fleetzero**](https://millionrounds.com/company/fleetzero) Fleetzero is building battery electric cargo ships to affordably decarbonize ocean freight. United States $43M - [**David Energy**](https://millionrounds.com/company/david-energy) David Energy is a technology-driven retail energy provider based in New York City, founded in 2019. United States $23M - [**BluWave-ai**](https://millionrounds.com/company/bluwave-ai) BluWave-ai is a Canadian clean-tech company based in Ottawa, Ontario, focused on artificial intelligence solutions for the energy sector. Canada $16M ### Series B 2 startups · $98M raised - [**Gridware**](https://millionrounds.com/company/gridware) Gridware is a leading cybersecurity company based in Sydney, Australia, dedicated to protecting businesses, governments, and organ United States $55M - [**Clever**](https://millionrounds.com/company/clever) Clever A/S is a leading electric mobility operator in Denmark, established in 2009 and based in Copenhagen. United States $43M ### Series C and later 2 startups · $463M raised - [**Helion Energy**](https://millionrounds.com/company/helion-energy) Helion Energy is a fusion power company developing the world's first fusion generators, enabling a future with unlimited clean energy. United States $437M - [**UgoWork**](https://millionrounds.com/company/ugowork) UgoWork, also known as Ingeniarts Technologies Inc., is a Canadian technology company based in Quebec City, specializing in lithiu Canada $26M **How this map is made.** Every startup here works in Energy and has raised money in a round we track that names Y Combinator as an investor. Each sits under the stage of its latest round. Rebuilt nightly; updated 15 November 2026. ## More portfolio maps [All portfolios](https://millionrounds.com/portfolio-maps) [Sector portfolio **Y Combinator's AI portfolio** 1,143 startups · $44B](https://millionrounds.com/portfolio-maps/y-combinator-ai-portfolio)[Sector portfolio **Y Combinator's Fintech portfolio** 338 startups · $24B](https://millionrounds.com/portfolio-maps/y-combinator-fintech-portfolio)[Sector portfolio **Y Combinator's Big Data & Analytics portfolio** 201 startups · $3.4B](https://millionrounds.com/portfolio-maps/y-combinator-big-data-analytics-portfolio)[Sector portfolio **Y Combinator's Healthtech portfolio** 150 startups · $4.2B](https://millionrounds.com/portfolio-maps/y-combinator-healthtech-portfolio)[Sector portfolio **Y Combinator's IT Services portfolio** 148 startups · $840M](https://millionrounds.com/portfolio-maps/y-combinator-it-services-portfolio)[Sector portfolio **Y Combinator's Web3 & Crypto portfolio** 139 startups · $7.4B](https://millionrounds.com/portfolio-maps/y-combinator-web3-crypto-portfolio) ## Raising from investors like Y Combinator? 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