Sector portfolio · Accelerator · United States
Y Combinator's Energy portfolio
Y Combinator has backed 30 Energy startups in rounds we track, $1.7B between them, shown by the stage each has reached. The best-funded is Symphony.
Funding by segment
- Pre-seed and seed$648M16
- Stage not reported$374M7
- Series A$82M3
- Series B$98M2
- Series C and later$463M2
Where they are based
- United States19$1.6B
- Canada5$68M
- France2$3.7M
- United Kingdom1$3.0M
- South Africa1$2.3M
- Norway1$17M
United States
Canada
France
United Kingdom
South Africa
NorwayFounded
6 without a founding year on record.
Total raised
- Under $1M5
- $1M to $10M11
- $10M to $50M10
- $50M to $250M1
- $250M to $1B3
- $1B and over0
Each dot is a startup: the year it was founded across, the total it has raised up (each line is ten times the one below). Pick a segment to pick it out.
24 of 30 startups shown; the rest have no founding year or amount on record.
- 1 to 2
- 3 to 7
- 8 to 24
- 25 to 99
- 100 and more
- United States19
- Canada5
- France2
- United Kingdom1
- South Africa1
- Norway1
Startups by country, 6 countries in all.
Segment by segment
Pre-seed and seed
16 startups · $648M raised
- SSymphonyUnited States$599M
- PParityCanada$23M
Maritime FusionMaritime Fusion is a San Francisco-based alternative energy equipment company founded in 2024.United States$4.5M
ByteratByterat is a modern cloud platform for battery data analytics.United States$4.0M
Elyos EnergyElyos Energy is a software platform for energy optimization, flexibility, and demand response.United Kingdom$3.0M
Holy GrailHoly Grail is a technology company based in Mountain View, California, founded in 2019.United States$2.7M
ZimiZimi is a South African company specializing in integrated electric vehicle (EV) charging and energy management solutions tailoredSouth Africa$2.3M
AkiflowAt Akiflow we help users to manage their time wisely by offering an all-in-one productivity hub, where you can access and plan allUnited States$1.8M
Stage not reported
7 startups · $374M raised
Vesper EnergyVesper Energy creates utility-scale renewable energy projects that address today's energy challenges.United States$286M- AAApollo AtomicsUnited States$32M
Sonocharge EnergySonocharge Energy develops a technology that enables batteries to charge.United States$24M
Gen2 EnergyGen2 Energy creates, runs, and manages a green hydrogen supply chain.Norway$17M
YottaYotta Data Services, part of Nidar Infrastructure Limited, is a leading provider of hyperscale data center and cloud infrastructure in India.United States$12M
AirthiumAirthium is a French deeptech-greentech startup founded in March 2016, based in Villebon-sur-Yvette, near Paris.France$3.2M
Calogy SolutionsCalogy Solutions is a thermal management and battery systems company focused on Li-ion batteries for electric transport, energy stCanada$1.1M
Series A
3 startups · $82M raised
FleetzeroFleetzero is building battery electric cargo ships to affordably decarbonize ocean freight.United States$43M
David EnergyDavid Energy is a technology-driven retail energy provider based in New York City, founded in 2019.United States$23M
BluWave-aiBluWave-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
Series C and later
2 startups · $463M raised
Helion EnergyHelion Energy is a fusion power company developing the world's first fusion generators, enabling a future with unlimited clean energy.United States$437M
UgoWorkUgoWork, also known as Ingeniarts Technologies Inc., is a Canadian technology company based in Quebec City, specializing in lithiuCanada$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.
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