We Can Take Power From a Plasma
Realta Fusion didn't just light a bulb. They lit it with electricity pulled straight from plasma—no steam, no turbines, no third-act handwaving.
On June 19, 2026, the Wisconsin startup ran a small experiment on its WHAM device: it generated enough electricity directly from fusion plasma to power a few lightbulbs. CEO Kieran Furlong summed it up in one sentence TechCrunch quoted: "We can take power from a plasma."
That's the headline. The rest is context—and it matters because fusion startups spent years proving they could get more energy out than in. Now the real challenge is making that output profitable, and WHAM just showed a shortcut.
The trick isn't new. Direct energy conversion (DEC) has been in the fusion playbook for decades: capture charged particles like alpha particles as they fly out, steer them through a collector, and extract current before they thermalize. But no private company had publicly demonstrated it until WHAM.
Realta isn't claiming fusion energy breakeven yet—its device doesn't run on deuterium-tritium fuel, so the DEC harvested input power rather than alpha particles. But they've demonstrated the conversion stage works exactly as predicted.
This matters because every fusion reactor eats part of its own output just to stay alive. Heating the plasma, running magnets, cryoplants, diagnostics—all draw megawatts before you even think about grid export. DEC makes that self-sustain loop tighter.
If DEC is ~90% efficient and steam turbines are stuck around 33%, you're not just adding a new subsystem; you're rewriting the economics.
Here's what it looks like on paper:
- Direct energy conversion: ~90% efficiency
- Steam turbine in fission: ~33% efficiency
- Typical fusion recirculated fraction without DEC: >70%
- Realta's projected recirculation with DEC: <50%
That shift doesn't just improve the bottom line. It shrinks balance-of-plant, cuts O&M complexity, and raises net output by an estimated 20–30%—numbers Furlong confirmed in multiple interviews.
The WHAM run was small-scale, yes. But the physics of charged-particle collection scales cleanly. The real bottleneck becomes engineering: materials that survive neutron flux, collectors that handle high-current beams, and thermal management when your "waste heat" is actually useful output.
Which is to say: you can read every fusion roadmap on the internet and see DEC as an afterthought. Realta made it the centerpiece.
The rest of this article unpacks why that choice changes everything—from how WHAM works to who's watching the cash register—and what it means for cloud security teams that will soon manage hybrid critical infrastructure combining traditional grids and next-gen fusion plants.
It also explains why a security & compliance analyst should care: as fusion plants become viable, their cyber-physical attack surface expands dramatically. Security isn't just IT locks on controllers—it's protecting against kinetic consequences of misconfigured control loops, off-normal event signaling during alpha-heating phases, and third-party supply-chain risks introduced by high-availability DEC hardware.
You'll walk away with a clearer picture of what's real, what's aspirational, and how to talk about both without sounding like a press release.
How WHAM Skips the Steam (And Why It Changes Everything)
Fusion startups face a brutal arithmetic: net-positive fusion is step one. Economic viability is step two, and nobody has cleared it yet.
Most designs still think like steam engines—heat plasma, boil water, spin turbine, generate electricity. It's tried and true, but it comes with a lot of baggage: boilers, turbines, condensers, cooling towers, all of which add capital cost, complexity, and points of failure.
Realta's WHAM device flips the script. Instead of chasing thermal cycles, it tries to capture charged fusion products before they turn into heat.
The physics itself is elegant. In a deuterium-tritium fusion reaction, 80% of the energy goes to a neutron (uncharged), while the remaining 20% ends up in an alpha particle—a helium nucleus—that carries positive charge. Because it's charged, you can steer the alpha with magnetic fields and drain its kinetic energy directly as electrical current.
The WHAM prototype uses a magnetic mirror configuration: two end mirrors and a central cell that confines plasma along an axis. The Direct Energy Converter attaches at one end, pulling high-energy alpha particles out of the plasma stream and into a collector stack.
The June 19 run didn't use D-T fuel, so they injected external power into the DEC to validate the hardware. TechCrunch confirmed that multiple amps at 100 volts were harvested, enough to power several standard lightbulbs. That's small power, but important proof that the hardware doesn't melt under beam load.
Think of it like this: fusion gives you charged bullets. Most reactors try to stop them with a wall and turn the impact into heat. WHAM catches the bullets mid-flight, extracts work, then recycles the spent projectile.
This matters because every watt you don't burn heating the plasma is a watt that goes to the grid. The recirculated power fraction—the share of gross output used by the plant itself—determines net efficiency. DEC slashes that fraction.
A conventional steam-cycle reactor might recirculate 60–80% of gross output. With DEC, Realta targets under 50%. That's not a marginal win; it can make the difference between a demo and a sellable asset.
The engineering challenge now is durability. Fusion neutrons will eventually wreck any solid structure near the core. But if you can keep the DEC clean and well-cooled, your recirculation loop runs longer before scheduled maintenance.
Realta hasn't published neutron-life estimates yet. For now, the DEC test hardware ran in a low-neutron environment to isolate electrical performance.
Still, their approach is worth watching. If you can keep your recirculation low enough, your startup doesn't need a government-sized budget to reach breakeven.
The company raised $36 million in Series A funding led by Future Ventures in 2025 and is currently raising again. That's not enough to build a full-scale pilot plant—but it might be enough to prove DEC at scale, and that's exactly what investors want to see next.
Security & Compliance Analysts: Here's Why Your Role Changes Around Fusion Plants
You've heard about nuclear power having a cybersecurity problem. Fusion doesn't change that—it just changes the vector.
A fusion plant isn't a fission reactor with better shielding. It's a different beast: high-voltage, high-field, cryogenic, and increasingly digital. The alpha-heating loop in a DEC-equipped plant means control systems must manage both thermal and electrical feedback paths simultaneously.
That's where a security & compliance analyst comes in. You're not just monitoring logs—you're modeling how an off-normal signal in the DEC collector could cascade into a plasma quench, or how an external grid transient might trip your recirculated power supply.
Consider these three exposure layers:
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Control Loop Integrity: The DEC's power electronics feed back into the plasma heating subsystem. A misconfigured controller or an injected fault could overheat a collector, damage hardware, and trigger a safe-shutdown sequence. The incident response playbook for this isn't your typical ransomware scenario—it's a hybrid cyber-physical response. See our guide on cloud security incident response playbook for foundational frameworks.
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Supply Chain Trust: DEC hardware includes specialized collectors, high-voltage insulators, and beam-dump materials. Third-party vendors could introduce backdoors or supply-chain poisoning before installation even begins. A security & compliance analyst must verify component provenance, firmware signing, and repairability—exactly like you would for any critical infrastructure controller. The Veeam CVE-2026-44963 RCE vulnerability demonstrates how a single unpatched component can expose entire domains.
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Regulatory Alignment: Fusion plants will eventually fall under nuclear regulatory bodies, not just traditional IT frameworks. That means aligning with NRC, IAEA guidance, and sector-specific cybersecurity baselines—while keeping up with evolving cloud compliance standards like 365 audit trails and Office 365 security & compliance center requirements.
None of this is theoretical. A misconfigured safety interlock once brought down an entire regional grid in South Africa's 2023 load-shedding crisis. A similar flaw in a fusion plant could cause a controlled shutdown—or worse, an uncontrolled one.
Your job isn't to build the reactor. It's to ensure that when things go wrong, they fail safe, that logs remain intact for forensic review, and that incident response teams can distinguish between a normal transient and an attack vector.
WHAM doesn't have all the answers yet—but it just showed that direct electricity conversion works. The next step is scaling, and scaling means adding more sensors, more controllers, more integrations.
That's where security & compliance analysts get a seat at the table—because no one wants a breach to turn into a black start failure.
Who's Next? Helion and the Race to Net-Zero Recirculation
Realta isn't alone in betting on DEC. Helion, the Seattle-based startup backed by Sam Altman, has direct energy conversion baked into its pulsed magnetic compression design from day one.
Unlike Realta, Helion aims for aneutronic p-B11 fuel, which produces mostly charged particles and very few neutrons. That simplifies materials challenges but raises ignition difficulty—a whole separate can of worms.
Helion hasn't publicly demonstrated DEC yet, and its most recent public update focused on its Polaris prototype and a power purchase agreement with Microsoft. The company has raised over half a billion dollars to date, making it one of the better-funded fusion ventures.
The race isn't just about who reaches breakeven first. It's about who clears the recirculation threshold fastest. A plant that needs less than 50% of its gross output to stay alive has a clear path to profitability.
DEC offers a 30%+ efficiency lift over steam cycles. That's not just "nice to have"—it's the difference between a science experiment and a utility-scale asset.
Realta's June 19 milestone is small, but it's real. They walked across the creek first. Now everyone else has to follow.
The Bottom Line for Security & Compliance Professionals
Fusion energy is moving from physics to engineering. Realta's WHAM device proves direct electricity harvesting works outside theory and national labs.
That matters because it changes the economic case, speeds time-to-market, and shrinks the balance-of-plant footprint—all things investors love.
But it also shifts security risk. When control systems manage both plasma heating and DEC power recirculation, a single flaw can cascade across domains.
Your role as a security & compliance analyst evolves from guardrails to architecture. You're not just securing endpoints—you're ensuring that the fusion loop, the DEC, and the grid interface all speak the same language of safety.
Realta's breakthrough doesn't mean fusion is solved. But it does mean you can stop saying "when," and start talking about "how fast."
And that's the story every security & compliance analyst should be prepared to tell.
