Helion Energy

Private

Everett, Washington-based private fusion electricity startup building Polaris, its 7th prototype. Targeting first commercial fusion power plant delivering electricity to a Microsoft data center by 2028, and a 500MW plant for Nucor in the 2030s. Founded 2013; Sam Altman is longtime board chair.

Founders David Kirtley, John Slough, Chris Pihl, George Votroubek

CEO David Kirtley

Company

Founded

2013

Headquarters

Everett, USA

Financials

Total Funding

$990M

Sectors

Climate Tech Aerospace Hardware

www.helionenergy.com

Funding History

3 rounds

Series G Jun 4, 2026

$465M

Thrive Capital (Lead) Alta Park Capital Anti Fund BoxGroup Lux Capital Peak XV Partners Bill Ford Capricorn Investment Group Lightspeed Venture Partners Mithril Capital Dustin Moskovitz Good Ventures Foundation SoftBank Vision Fund 2

Series F Jan 15, 2025

$425M

Lightspeed Venture Partners (Lead) SoftBank Vision Fund 2 Sam Altman Mithril Capital Capricorn Investment Group Good Ventures Foundation Nucor

Series D Apr 1, 2023

$100M

Eden Global Partners (Lead)

Funding data is compiled from multiple independent sources including company announcements, press coverage, and regulatory filings. While we strive for accuracy, amounts and dates may reflect reported figures at time of announcement.