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Pacific Fusion pours concrete in Albuquerque; the yardstick is 500 megajoules at one shot per second
Ground broke on August 25 on a $1 billion, 156-module pulsed machine aiming at net facility gain by 2030. The commercial gap is five times the output and 86,400 shots a day.
The Engineer · Build desk
What happened
- Pacific Fusion broke ground in Albuquerque on August 25 on a machine built from 156 identical pulser modules.
- The $1 billion demonstrator targets net facility gain by 2030, counting the energy stored to drive the shot, unlike the National Ignition Facility's 2022 result.
- Nature reported the company expects each shot to draw about 80 megajoules of stored electricity and yield about 100 megajoules of fusion energy.
- A commercial plant would need roughly five times that output and a firing rate counted in shots per second rather than shots per day.
- A one-third-scale pulser tested this spring reached 440 gigawatts of peak power and 1.1 million volts across an 80-nanosecond pulse.
Why it matters
- constraint Output and repetition rate are separate engineering problems, and hardware qualified for a few shots a day says nothing about capacitor and switch life at 86,400.
- contradiction The two accounts disagree on whether the milestone-gated round was $900 million or over $1 billion.
- capability Because the driver can be run without the chamber and target in the loop, a failed shot can be blamed on one subsystem rather than the whole plant, which is how a build stays on a financing schedule.
- precedent Booking the site for national security high-yield work gives the machine a customer even if gain slips past 2030, and sets the pattern other pulsed-power startups will copy.
A part count comes before an energy balance. Each of the 156 modules is 32 circular stages of 10 bricks, and each brick holds two capacitors and a switch [7]. That works out to 49,920 bricks in the finished driver [22], carrying 99,840 capacitors and 49,920 switches [23]. The one-third-scale pulser test that cleared the way to construction [10] demonstrated what a single unit can do; it did not demonstrate fifty thousand switches closing in step, which is what the design's requirement for precisely synchronised pulses actually asks for [16].
Divide the stored energy of one shot across the modules and each pulser owes about 513 kilojoules [28]. The same two figures Nature reported put the facility's gain at 1.25 [24], which is a thin margin to be building a billion dollars of hardware around, and is exactly why the 2030 date is a gate rather than a product.
Now the commercial number. Pacific Fusion's own framing, as reported by mezha.net, is that an industrial reactor must produce roughly five times the demonstration machine's energy to cover the auxiliary systems a real plant carries [15]. Five times 100 megajoules is 500 megajoules a shot [25], and 500 megajoules once a second is 500 megawatts of fusion heat [26]. What neither account settles is whether the driver grows with it. If stored energy scales at the same factor, a plant firing at one hertz has to push 400 megajoules back into its capacitors every second; if the driver stays at 80 megajoules, the recharge burden is 80 megawatts [32]. Those two readings describe different businesses.
The rate is the harder half. One shot per second is 86,400 shots a day, something like four orders of magnitude above the handful the demonstrator will manage [27], and the Albuquerque machine is only designed for the handful [11]. So nothing built on this site tests capacitor lifetime, switch wear or thermal recovery at duty. What it does test is whether the modular driver holds together and whether the target burns, and the architecture is arranged to answer those separately: the driver can be exercised without the chamber and fuel target in the loop [20], and the modules are steel, aluminum, plastic, oil and water, built away from site and serviced like industrial equipment [19].
The financing story has a loose thread. RuntimeWire, citing TechCrunch, describes a milestone-gated Series A of more than $900 million led by General Catalyst, structured so the founders hold committed capital without receiving all of it before the hardware works [29], and notes that a later total above $1 billion does not reconcile with that figure [30]. Mezha.net, working from the same TechCrunch reporting, states the milestone-gated Series A itself exceeded $1 billion [31]. The gating is the whole discipline claim here, so which of those is right determines how much money is still hostage to the 2030 result.
Meanwhile the site has a second buyer built in: high-yield experiments tied to national security [18], with chief technical officer Keith LeChien telling TechCrunch that China is building this class of facility and that Pacific Fusion means to finish first [13]. That is a hedge worth having when four other companies are pointing at the same middle of the 2030s for grid connection [21].
What to watch
- Whether a full-scale pulser module demonstrates its roughly 513 kilojoules per shot, and whether the next funding tranche releases against it.
- Any public reconciliation of the Series A figure with the 'more than $1 billion' total attributed to the same round.
- Whether the national security experiments bring federal money, or federal scheduling priority, onto the Albuquerque site.
Clarity's read
What the record supports and how the coverage leans. The claims behind it follow.
Reality
- Evidence61
- Adoption22
- Hype gap+28
- Incentives74
- Confidence58
Claim ledger
Ranked by verification strength, evidence, and original report placement.
- [1]
Pacific Fusion co-founders Carrie von Muench and Keith LeChien broke ground in Albuquerque on August 25 on a fusion machine built around 156 identical pulser modules.
- [2]
The $1 billion demonstration project is designed to produce more fusion energy than the electricity stored in its capacitors.
- [3]
A commercial plant would still need about five times the output of the demonstration machine and a firing rate measured in shots per second instead of shots per day.
- [4]
Pacific Fusion is targeting net facility gain by 2030, a milestone that accounts for the energy initially stored to drive the reaction and goes beyond experiments producing more energy than reaches the fuel, including the National Ignition Facility's 2022 ignition result.
- [5]
Nature reported that Pacific Fusion expects each shot to use about 80 megajoules of stored electrical energy and produce about 100 megajoules of fusion energy.
- [6]
Von Muench told TechCrunch: "It's a huge step forward for commercial fusion power."
ReportedSupportedSource: Carrie von Muench to TechCrunch2 sources— create a free account to open themView cited source - [7]
Each pulser module contains 32 circular stages, and each stage is assembled from 10 bricks containing two capacitors and a switch.
- [8]
The demonstration system will surround a meter-scale fusion chamber, and the fired modules deliver a fast electrical pulse creating a magnetic field around a deuterium-tritium target roughly the size of a pencil eraser.
- [9]
Pacific Fusion tested a roughly one-third-scale pulser this spring that produced 440 gigawatts of peak power and 1.1 million volts during an 80-nanosecond pulse.
- [10]
After the one-third-scale module test, the company decided to proceed to construction of the demonstration facility.
- [11]
The demonstration complex will be able to perform only a few pulsed shots per day, while a commercial fusion plant would need roughly one shot per second.
- [12]
According to Keith LeChien, one shot of the demonstration system will produce about 100 megajoules, roughly ten times the National Ignition Facility.
ReportedSupportedSource: Keith LeChien to TechCrunch2 sources— create a free account to open themView cited source - [13]
LeChien told TechCrunch that nothing like this exists anywhere in the world, that China is building facilities of this type, and that Pacific Fusion intends to finish first.
ReportedSupportedSource: Keith LeChien to TechCrunch2 sources— create a free account to open themView cited source - [14]
Pacific Fusion was founded in 2023 around the thesis that national-laboratory breakthroughs could support an affordable, scalable and modular fusion machine.
- [15]
Mezha.net reports Pacific Fusion's design intent that an industrial reactor produce roughly five times more energy than the demonstration installation, to compensate for the additional systems a full plant requires.
- [16]
The company's technology relies on powerful electrical pulses that must arrive with precise synchronisation.
- [17]
Pacific Fusion's stated next stage after net facility gain is launching a commercial fusion power plant in the middle of the 2030s.
- [18]
The new site is also planned for use in high-yield fusion experiments related to national security.
- [19]
In its June technical update, Pacific Fusion said its modular approach uses common industrial materials including steel, aluminum, plastic, oil and water, with modules built away from the final site, transported and serviced as industrial equipment.
- [20]
The design lets Pacific Fusion test its driver independently from the chamber and fuel target, shortening the feedback loop when something fails.
- [21]
Pacific Fusion competes with Commonwealth Fusion Systems, Helion Energy, Proxima Fusion and Inertia Enterprises, all of which see the middle of the 2030s or earlier as a possible period for connecting fusion plants to the grid.
- [22]
The completed driver contains 49,920 bricks.
- [23]
Those bricks hold 99,840 capacitors and 49,920 switches.
- [24]
The expected shot implies a facility gain of about 1.25.
- [25]
Five times the demonstration output is about 500 megajoules of fusion energy per shot.
- [26]
A 500 megajoule shot fired once a second is 500 megawatts of fusion heat.
- [27]
One shot per second is 86,400 shots a day, roughly four orders of magnitude above a handful of daily shots.
- [28]
Each pulser module must deliver about 513 kilojoules of stored energy per shot.
- [29]
Pacific Fusion secured more than $900 million in a milestone-gated Series A led by General Catalyst, giving the founders committed capital without handing them all of it before the hardware worked.
- [30]
TechCrunch reported that Pacific Fusion has since raised more than $1 billion, though public descriptions do not reconcile that total with the earlier Series A figure.
- [31]
Mezha.net reports that Pacific Fusion has already raised more than $1 billion in a Series A tied to the completion of specific technological milestones.
- [32]
If driver energy scales with output, a one hertz commercial plant must recharge 400 megajoules per second, or 400 megawatts; if the driver stays at 80 megajoules per shot, the figure is 80 megawatts, a factor of five apart.
Sources
2 independent publishers whose own reporting we read for this story.
- mezha.netPacific Fusion будує в Альбукерке установку для перевірки енергетичного балансу
1 article · August 25, 2026
- runtimewire.comPacific Fusion breaks ground on a $1B machine targeting net facility gain
1 article · August 25, 2026
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Topics
Entities
- Pacific FusionFollow
- Carrie von MuenchFollow
- Keith LeChienFollow
- Eric LanderFollow
- Will ReganFollow
- Leland EllisonFollow
- General CatalystFollow
- National Ignition FacilityFollow
- Lawrence Livermore National LaboratoryFollow
- Commonwealth Fusion SystemsFollow
- Helion EnergyFollow
- Proxima FusionFollow
- Inertia EnterprisesFollow
- Michael CampbellFollow
- TechCrunchFollow
- NatureFollow