Top accelerator startups

Startups14,448Programs29

14,448 startups · 29 programs

Helion Energy

Active · Building the world's first fusion power plant

WebsiteYC profile

Why it ranks

How the rank works
15signal of 100 · rising 2
  • team of 150Team size · YC's directory+11.3
  • went through YCProgram · this site+4

A sum of public facts, not a judgement and not investment advice.

Competitors

OtherZephyr FusionShared: fusion power, fusion energy, buildingYC F25San DiegoStartup →AIAtmetoShared: energy, climate, powerYC W23Los AngelesStartup →AIMaingenShared: power plant, energyYC S26San FranciscoStartup →OtherMaritime FusionShared: fusion energy, power, electricityYC W25San FranciscoStartup →OtherPublicOkloShared: power plant, climate, energyYC S14San FranciscoStartup →
Companies closest to Helion Energy
Company
Zephyr FusionShared: fusion power, fusion energy, buildingYC F25ActiveOther
AtmetoShared: energy, climate, powerYC W23ActiveAI
MaingenShared: power plant, energyYC S26ActiveAI, Data
Maritime FusionShared: fusion energy, power, electricityYC W25ActiveOther
OkloShared: power plant, climate, energyYC S14PublicOther

Adjacent

OtherPowernautShared: power plantSeedcamp 2024Startup →OtherDeepgridShared: power plant, electricityGoogle AI for Energy 2026SwedenStartup →Developer toolsAcquiredGlow EnergyShared: power plant, buildingYC W22Los AngelesStartup →OtherCeal MineralsShared: power plant, carbonMassChallenge Switzerland 2025IsraelStartup →OtherInactiveMoxion Power Co.Shared: energy, climate, powerYC W21San FranciscoStartup →
Companies next to Helion Energy
Company
PowernautShared: power plantSeedcamp 2024Not statedOther
DeepgridShared: power plant, electricityGoogle AI for Energy 2026Not statedOther
Glow EnergyShared: power plant, buildingYC W22AcquiredDevtools
Ceal MineralsShared: power plant, carbonMassChallenge Switzerland 2025Not statedOther
Moxion Power Co.Shared: energy, climate, powerYC W21InactiveOther

Also from S14

All of S14
Developer toolsAcquiredAptibleThe No Infrastructure Platform as a ServiceYC S14New York CityStartup →DataInactiveBillforwardSubscription billing, rate plan management and analytics as a…YC S14San FranciscoStartup →DataAcquiredBlockspringAutomate data collection for spreadsheets and productivity tools.YC S14Los AngelesStartup →AICheckrPeople infrastructure for the future of workYC S14San FranciscoStartup →Developer toolsAcquiredCognitoFrictionless, modern identity verification that starts with just a…YC S14San FranciscoStartup →DataAcquiredHubloHublo is making data-driven marketing simpler. It's a super simple…YC S14ParisStartup →
Company
AptibleThe No Infrastructure Platform as a Serviceteam of 25acquiredAcquiredDevtools
BillforwardSubscription billing, rate plan management and analytics as a…team of 8InactiveData
BlockspringAutomate data collection for spreadsheets and productivity tools.acquiredteam of 3AcquiredData, Devtools
CheckrPeople infrastructure for the future of workteam of 800YC top companyActiveAI, Devtools
CognitoFrictionless, modern identity verification that starts with just a…YC top companyteam of 12AcquiredDevtools
HubloHublo is making data-driven marketing simpler. It's a super simple…acquiredteam of 2AcquiredData

About Helion Energy

Helion is creating the world’s first fusion power plant, enabling a future with unlimited zero-carbon electricity.

YC batch
S14 · Summer 2014
Status, per YC
Active
Category
Other
Team size
150
Location
Seattle, WA, USA; Everett, WA, USA
Checked
7h ago

YC tags: Fusion Energy, Hard Tech, Climate, Energy

Helion Energy in S14: 78 companies, 12% AI

Helion Energy: questions

Which YC batch was Helion Energy in?

Helion Energy was in Y Combinator's Summer 2014 batch (S14).

Is Helion Energy still active?

Y Combinator lists Helion Energy as active.

Where is Helion Energy based?

Helion Energy lists Seattle, WA, USA; Everett, WA, USA as its location on YC's directory.