Helion Energy

Helion Energy, Inc.

Last updated Jul 6, 2026

Fusion Machine Developer

Projects: 5 Funding (Investment): 9 Funding (Nondilutive): 3 Jobs: 63 News: 2 Articles: 2

Founding Year

2013

Location

Everett, Washington, United States

Company Founders

Chris Pihl

David Kirtley

George Votroubek

John Slough

Leadership

David Kirtley, CEO

Chris Pihl, CTO

George Votroubek, Principal Scientist

Website

helionenergy.com

Helion is a fusion machine developer pursuing the field-reversed configuration (FRC) path to fusion energy. Helion has built and operated a number of FRC machines and is currently building Polaris, an FRC with the stated goal of generating electricity from fusion reactions.

News

Helion funding round grows to $500M amid uncertainty over fusion startup's Microsoft timeline

Sep 15, 2026 • GeekWire

With a headcount topping 800, Helion opens Seattle office in pursuit of fusion energy

Sep 8, 2026 • geekwire.com

Articles

September 2025 Fusion Equity Investment Update

September 01, 2025 Investment

July 2025 Fusion Equity Investment Update

July 14, 2025 Investment

Projects

FEP

2018 - Present

IPA

2005 - 2012

Polaris

Description

Polaris is Helion's seventh-generation prototype device. The project has been in development since 2021. The field reversed configuration device is designed to be 19 meters long.

Trenta

Description

Trenta is Helion's sixth-generation prototype device. The field reversed configuration device has a total length of 15 meters.

In 2020, the Trenta device was able to achieve temperatures of 9 keV or 100 million degrees Celsius.

Venti

Funding Received (Investment)

June 4, 2026

roundSeries G

$465,000,000

FundersCapricorn Investment Group Lightspeed

+ 9 More

AnnouncementSeries G: https://www.helionenergy.com/newsroom/helion-raises-465-million-series-g-funding-round-to-meet-surging-global-demand-for-power

January 28, 2025

roundSeries F

$425,000,000

FundersNucor Capricorn Investment Group

+ 3 More

AnnouncementSeries F

September 27, 2023

roundNucor Strategic

$35,000,000

FundersNucor

AnnouncementNucor Strategic

November 5, 2021

roundSeries E

$500,000,000

AnnouncementSeries E

September 3, 2020

roundSeries D

$40,000,000

AnnouncementSeries D

January 1, 2019

roundSeries C

$10,000,000

FundersCapricorn Investment Group

AnnouncementSeries C

July 6, 2015

roundSeries B

$10,614,202

FundersMithril Capital Management Capricorn Investment Group

Announcement

August 12, 2014

roundSeries A

$1,499,986

FundersMithril Capital Management Y Combinator (YC)

AnnouncementSeries A

August 9, 2014

roundSeed

$120,000

FundersY Combinator (YC)

Announcement

Funding Received (Nondilutive)

September 10, 2025

programINFUSE

FundersFusion Energy Sciences (FES)

AnnouncementINFUSE: Study of field reversed configuration stability during super-Alfvénic acceleration and translation via hybrid kinetic simulations

July 25, 2023

programINFUSE

FundersFusion Energy Sciences (FES)

AnnouncementINFUSE: Nonlinear kinetic simulation study of non-equilibrium and merging FRCs

September 30, 2015

programALPHA

$3,971,263

FundersAdvanced Research Projects Agency-Energy (ARPA-E)

AnnouncementALPHA: Compression of FRC Targets for Fusion

Jobs

Electrical Engineering Summer Intern

Helion Energy

Everett, Washington, United States

Electrical Engineering

On-site

Found a day ago

Facilities Operations Manager

Helion Energy

Everett, Washington, United States

Technician

Full-time

On-site

Found a day ago

High Voltage Test Technician

Helion Energy

Everett, Washington, United States

Technician

Full-time

On-site

Found 3 days ago

Senior Controls Technician

Helion Energy

Everett, Washington, United States

Technician

Full-time

On-site

Found 3 days ago

Senior Maintenance Technician

Helion Energy

Everett, Washington, United States

Technician

Full-time

On-site

Found 3 days ago

Senior Systems Engineer

Helion Energy

Everett, Washington, United States

Systems Engineering

Full-time

On-site

Found 3 days ago

Systems Engineer

Helion Energy

Everett, Washington, United States

Systems Engineering

Full-time

On-site

Found 3 days ago

Senior Electrical Engineer – Dielectric Materials Development and Analysis

Helion Energy

Everett, Washington, United States

Electrical EngineeringMaterials

Full-time

On-site

Found 4 days ago

Welder

Helion Energy

Everett, Washington, United States

Technician

Full-time

On-site

Found 5 days ago

Machine Shop Supervisor

Helion Energy

Everett, Washington, United States

Manufacturing

Full-time

On-site

Found 5 days ago

Principal Compensation Partner

Helion Energy

Seattle, Washington, United States

People & HR

Full-time

On-site

Found 5 days ago

Senior AP Analyst

Helion Energy

Seattle, Washington, United States

Finance

Full-time

On-site

Found 5 days ago

Senior Financial Analyst (Contract)

Helion Energy

Seattle, Washington, United States

Finance

Contract

On-site

Found 8 days ago

Senior Materials Engineer, Material Health Monitoring

Helion Energy

Everett, Washington, United States

Materials

Full-time

On-site

Found 11 days ago

Corporate Communications Specialist

Helion Energy

Seattle, Washington, United States

Communications

Full-time

On-site

Found 19 days ago

Director of Plasma Physics

Helion Energy

Everett, Washington, United States

Physics

Full-time

On-site

Found a month ago

Principal Applied Plasma Data Scientist

Helion Energy

Everett, Washington, United States

PhysicsSoftware Engineering

Full-time

On-site

Found a month ago

Senior Applied Plasma Data Scientist

Helion Energy

Everett, Washington, United States

PhysicsSoftware Engineering

Full-time

On-site

Found a month ago

Senior Manager, Software Engineering, Plant Control

Helion Energy

Everett, Washington, United States

Software EngineeringElectrical Engineering

Full-time

On-site

Found a month ago

Procurement Manager

Helion Energy

Everett, Washington, United States

Supply Chain

Full-time

On-site

Found a month ago

See All Jobs

Get Fusion Job Alerts

New fusion energy jobs delivered to your inbox.