Helion Energy | Sam Altman's $1.65B Fusion Conflict and the Polaris Milestone

What Is Helion Energy | Sam Altman's Fusion Startup and the OpenAI Conflict

Helion Energy is a privately held nuclear fusion company headquartered in Everett, Washington. The company is developing a pulsed fusion generator based on Field-Reversed Configuration (FRC) plasma technology, which it argues is faster, cheaper, and more commercially viable than the massive, government-funded fusion projects that have dominated the field for decades. As of May 2026, Helion is valued at approximately $5.4 billion, a figure that became legally contested when the company's ownership structure was examined during the Musk v. Altman trial in Oakland federal court.

The company has attracted more than $575 million in venture funding, anchored by a $375 million Series E led by Sam Altman in 2021. That investment gave Altman a one-third stake in the company, now valued at approximately $1.65 billion. The disclosure of this stake, confirmed by attorney Steven Molo during trial proceedings, triggered federal and state inquiries into whether Altman used his position as CEO of OpenAI to steer the company's energy procurement decisions in a way that benefited his private holdings.

For context on the broader OpenAI story, see the OpenAI hub and the Technology hub for related coverage.

Helion's Technical Architecture | Pulsed FRC Fusion vs the Tokamak Approach

The dominant paradigm in fusion research for the past 60 years has been the Tokamak, a donut-shaped magnetic confinement chamber that uses massive superconducting magnets to hold plasma in a steady state long enough for fusion to occur. Projects like ITER, the international fusion project under construction in southern France at an estimated cost of $22 billion, operate on this principle. Tokamaks are expensive to build, slow to develop, and have not yet achieved net energy gain at commercial scale.

Helion takes an entirely different approach. Its system uses a pulsed magnetic field to compress two plasma rings, called Field-Reversed Configuration (FRC) rings, toward each other at high speed. As they collide and merge, the plasma reaches fusion temperatures. The pulsed approach allows for a significantly smaller physical plant than Tokamak designs, making modular and distributed deployment more practical for industrial-scale applications.

The FRC design cycles through fusion events in rapid succession rather than maintaining a continuous reaction. Helion's core engineering challenge is to make the pulse frequency and energy output per pulse sufficient to deliver net electricity generation, a milestone the company expects to achieve in its Polaris prototype before the 2028 grid-delivery target.

Direct Energy Conversion | Why No Steam Turbine Changes the Economics

The most commercially significant technical claim Helion makes is its direct energy conversion process. Every conventional power plant, including all existing nuclear reactors, generates electricity by using heat to boil water into steam, which spins a turbine connected to a generator. This thermal-to-electric conversion chain is inherently lossy, with typical efficiencies of 30 to 40 percent.

In Helion's system, the fusion reaction expands the plasma outward against the magnetic field coils surrounding the chamber. Because the fusion plasma is composed of electrically charged particles moving through a magnetic field, the expansion directly induces an electrical current in the coils, similar to how a generator works but without any moving mechanical parts. This direct magnetic induction process, if achieved at scale, would be dramatically more efficient than steam-cycle power generation.

Helion projects an eventual cost of $0.01 per kilowatt-hour, an order of magnitude below current industrial electricity prices. That projection, if realized, would make Helion's fusion power the lowest-cost dispatchable energy source at scale and a primary candidate for powering 2026-era AI data centers, which consume between 20 and 50 megawatts each and require 24-hour-a-day clean power that solar and wind alone cannot consistently provide.

The Polaris Milestone | 150 Million Degrees Celsius in February 2026

In February 2026, Helion's seventh-generation prototype, designated Polaris, successfully achieved a sustained plasma temperature of 150 million degrees Celsius. To put that figure in context: the core of the sun operates at approximately 15 million degrees Celsius. The Polaris plasma ran nearly ten times hotter.

This temperature threshold is significant because fusion fuels, specifically deuterium and helium-3, require extreme thermal conditions to overcome the electrostatic repulsion between atomic nuclei and fuse. Reaching 150 million degrees confirms that Helion's FRC compression approach can generate the thermal conditions required for net fusion energy. Polaris represents the final technical validation step before Helion attempts to deliver electricity to the commercial grid, currently targeted for 2028.

The milestone was independently reviewed by the Department of Energy's fusion program office and cited in Microsoft's ongoing assessment of whether Helion will meet the terms of its 2023 power purchase agreement. CEO David Kirtley described the Polaris result as the company's "most significant technical proof point to date."

Helion Energy | Official Technical Overview

The following video, published by Helion Energy, provides an overview of the FRC fusion approach, the Polaris prototype, and the company's 2028 grid target.

Analysis | Helion Energy vs Traditional Nuclear Fission

The $1.65 Billion Conflict | Altman, OpenAI, and the Musk v. Altman Trial

The Musk v. Altman trial, underway in Oakland federal court, has produced the most detailed public accounting of Sam Altman's financial interests in companies that do business with OpenAI. Attorney Steven Molo, representing Elon Musk, introduced evidence that Altman holds a one-third ownership stake in Helion Energy, currently valued at approximately $1.65 billion.

The core allegation is not merely that the investment exists, but that Altman actively used OpenAI's institutional weight to increase Helion's commercial value. Molo presented evidence that Altman advocated internally for OpenAI to invest $500 million directly into Helion, a transaction that, had it been completed, would have increased Helion's valuation by an estimated 600 percent. While that specific investment was not finalized, OpenAI did enter a 5-gigawatt power purchase agreement with Helion in 2024, committing the nonprofit to purchase electricity from Helion's not-yet-built commercial plant.

Critics and regulators argue that this agreement creates an impermissible conflict of interest. By committing OpenAI to purchase power from Helion, Altman effectively used a nonprofit technology organization's long-term procurement commitment to anchor the commercial future of a company in which he holds a $1.65 billion personal position. Altman's legal team has maintained that he was formally recused from all official OpenAI energy negotiations as of March 2026 and that the original investment predates his assumption of day-to-day operational control at OpenAI.

Political and Regulatory Scrutiny | Congress, State AGs, and the SEC

The trial disclosures have prompted parallel investigations from three directions:

• House Oversight Committee: Chairman James Comer (R-KY) has opened a formal inquiry into OpenAI's 2024 agreement to purchase 5 gigawatts of power from Helion, requesting documentation of any internal conflict-of-interest analyses and whether OpenAI's board was fully informed of Altman's stake at the time the agreement was executed.
• State Attorneys General: Attorneys General from four states sent a joint request to SEC Chairman Paul Atkins to investigate the transparency of what they described as "interlocking investments" between OpenAI's procurement agreements and Altman's private holdings. The specific concern is whether Helion's fundraising materials fully disclosed the OpenAI power purchase commitment as a material factor in its $5.4 billion valuation.
• FTC Review: The Federal Trade Commission has informally requested that OpenAI provide documentation of its governance policies for managing conflicts of interest involving executives with direct financial stakes in vendor companies.

Altman has stated publicly that he recused himself from all OpenAI energy negotiation decisions in March 2026, designating OpenAI's CFO to handle all Helion-related matters going forward. For ongoing trial and governance coverage, see the OzoneNews OpenAI hub.

Investor FAQ | Helion Energy in 2026

How can investors get exposure to Helion Energy?

Helion remains a private company and is not traded on any public exchange. Institutional exposure has historically been available through venture capital funds with positions in the company, primarily Mithril Capital, which participated in earlier funding rounds. High-net-worth individuals have in some cases accessed shares through secondary market platforms such as Forge Global or Hiive, subject to transfer restrictions. Sam Altman's one-third stake, valued at approximately $1.65 billion, constitutes the largest single non-institutional holding.

What is the status of the Helion and Microsoft partnership?

In 2023, Microsoft signed what its announcement described as a first-of-its-kind power purchase agreement with Helion, committing to purchase electricity from Helion's commercial fusion plant once operational. The agreement stipulates that Helion must provide a minimum of 50 megawatts of power by 2028, with significant financial penalties accruing to Helion for each month of delay beyond that target. As of May 2026, the agreement remains in effect and Microsoft has not publicly signaled any intent to exit the contract.

Does Helion Energy have any operational plants in Texas?

No. All of Helion's current prototype development and testing occurs at its headquarters in Everett, Washington. The company has not broken ground on any commercial facility. Discussions with Texas-based data center operators, including providers in the Austin technology corridor, are reportedly underway as those operators seek dispatchable clean power for the ERCOT grid. Any Texas commercial plant would come only after Helion meets its 2028 grid-connectivity milestone with Microsoft.