Pacific FusionOperational
The four-stage impedance-matched Marx generator prototype built at Lawrence Livermore National Laboratory under a cooperative research agreement. Sirius synchronizes electromagnetic waves onto a transmission line in a single step, which is what makes the architecture simpler and more efficient than conventional pulsed-power systems, and it is the machine that generated the empirical data validating Pacific Fusion's simulations.
Latest update Aug 1, 2026
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Completed 3,000 full-power shots by July 2026, delivering 60 GW in a 100-nanosecond pulse at 95% energy efficiency. The June 2026 scaled prototype is roughly an 11x scale-up of Sirius, and the full-scale module now in build is about 40x its size.
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Announced next steps from Pacific Fusion that mention Sirius.
2026-2027
Complete and test full-scale pulser modules, each roughly 40x the size of Sirius and 3x the June 2026 scaled prototype, to prove the unit that will be manufactured 156 times over for the Demonstration System. Nature reporters visiting the Los Lunas build center in August 2026 found two of the more than 150 full-scale modules already completed. Re-verified as of September 16, 2026: company updates through September 15 still describe demonstrating a full-scale pulser module as the next major technical checkpoint; no public full-scale module test result has been posted.
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Pacific Fusion and Lawrence Livermore National Laboratory reported that Sirius, their four-stage impedance-matched Marx generator prototype, has completed 3,000 full-power shots, each delivering 60 gigawatts in a 100-nanosecond pulse at 95% energy efficiency. The reliability campaign provides the empirical base for the much larger 156-module Demonstration System Pacific Fusion is targeting for net facility gain by 2030.
05
Pacific Fusion's first-of-a-kind machine, to be assembled at the $1B Mesa del Sol campus in Albuquerque from 156 production-scale pulser modules (each 32 circular stages ringed with 10 bricks). It is designed to reach net facility gain, producing more fusion energy than the total energy stored in the system, and to do it at roughly 100x the facility gain of the National Ignition Facility for about a tenth of the cost.
The repeating building block of the Demonstration System: an impedance-matched Marx generator that stacks capacitor-and-switch 'bricks' into stages and synchronizes them into a single ultra-fast, high-current pulse. Getting one module right and then manufacturing it 156 times is the company's whole scaling strategy.
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Commonwealth Fusion Systems
Compact, high-field tokamak designed to demonstrate net energy from fusion. It uses high-temperature superconducting magnets to achieve reactor-class magnetic fields in a much smaller machine, with peer-reviewed projections of roughly Q ~11 and ~140 MW of fusion power.
Commonwealth Fusion Systems
CFS' first planned grid-scale commercial fusion power plant, designed to deliver about 400 MW of clean electricity using the HTS magnet and tokamak stack proven through SPARC. The project is officially named the Fall Line Fusion Power Station and is planned for a 100-acre site at the James River Industrial Center in Chesterfield County, Virginia.
Helion Energy
7th-generation fusion prototype designed to demonstrate electricity production from fusion using Helion's pulsed magneto-inertial architecture and direct electricity recapture.
Helion Energy
First commercial fusion power plant, designed to generate 50+ MWe. Located in Malaga, Chelan County, Washington, on land leased from Chelan County PUD near Rock Island Dam. Power will be marketed by Constellation Energy to Microsoft data centers.