In June 2026, the United States Department of Energy published its Fusion Science and Technology Roadmap. It is, on the surface, a domestic planning document — a list of facilities, milestones, and gaps that one nation intends to close over the next decade. But read carefully, it is something more interesting: the clearest articulation yet of how a great scientific power intends to hand the lead in an emerging energy technology to its private sector, while keeping its public institutions firmly in the game.
For those of us trying to build a credible private fusion enterprise on Indian soil, this document repays close study. Not because we should copy it — our circumstances are different — but because it surfaces, in plain language, the choices every nation now faces. I want to set down what I take to be the real lessons for India, and where I think our own path must diverge.
The strategic shift hidden in three words
The Roadmap organises everything around three verbs: Build, Innovate, Grow. Underneath the alliteration sits a genuine change of posture. For seventy years, the American public programme — like every national fusion programme, including our own — assumed that the state would design and construct the first power plant. The 2021 National Academies report said as much.
The new Roadmap quietly retires that assumption. It now treats the private sector as the builder of first-of-a-kind machines, with the public programme repositioned to do something narrower and arguably more valuable: close the common scientific and technical gaps that no single company can justify paying for on its own. To make this concrete, DOE created a stand-alone Office of Fusion in late 2025 and restructured its science programme around it.
This is the lesson India should absorb first. The question is no longer “when will the Department of Atomic Energy build a fusion reactor?” It is “what must our public institutions build so that Indian companies can build reactors?” That is a different — and in my view, far more answerable — question.
Public money belongs where private money cannot go
The most useful part of the American document is its honesty about where public investment is decisive. It identifies six challenge areas — structural materials, plasma-facing components, confinement, the fuel cycle, breeder blankets, and whole-plant engineering — and is candid that several of these are bounded by physics and metallurgy, not by money. Materials qualification under fusion neutrons, and closing the tritium fuel cycle, take wall-clock time that capital cannot compress. No amount of venture funding shortens an irradiation campaign.
The American answer is to pool these burdens. Shared neutron sources, blanket and tritium test platforms, and a network of test stands are to be funded publicly and made accessible to all developers, because the cost of duplicating them is ruinous and the knowledge they generate is largely non-proprietary.
India already has the raw ingredients for exactly this model — and, in some respects, a head start. The Institute for Plasma Research, BARC’s irradiation and tritium-handling facilities, and our materials laboratories are national assets that took decades to build. The strategic act now is to deliberately open a defined slice of that capability to qualified private players, with clear rules of access. This is precisely the logic behind incubating a private company within IPR’s ecosystem — a path our own work is pursuing, and which I believe should become routine rather than exceptional. The American roadmap gives that instinct an external endorsement.
Learn the mechanisms, not just the intent
Good intentions about public–private partnership are common; workable instruments are rare. Here the Americans have done the hard design work, and we should study their toolkit rather than reinvent it.
They run four distinct instruments side by side, each with a different bargain. The Milestone Program pays private companies only for achieving defined technical and business milestones — a model borrowed deliberately from NASA’s commercial cargo programme. INFUSE issues small vouchers that buy private companies access to national-laboratory expertise. The FIRE Collaboratives fund universities and laboratories to close specific gaps that industry has flagged. A newer instrument, Fusion BRIDGE, co-finances the construction of shared facilities with state governments, philanthropy, and industry together.
India does not lack funding vehicles — between the Anusandhan National Research Foundation, the Technology Development Board, and the architecture now being enabled by recent legislation, the pieces exist. What we lack is the discipline of differentiated instruments matched to differentiated risks: one for milestone-based capital, one for expertise access, one for shared infrastructure. The American experience suggests this differentiation is not bureaucratic neatness; it is what allows the same rupee to be used four different ways for four different problems.
The validation we should note quietly, and the hype we should avoid
I will permit myself one observation that bears directly on the choices a company like ours has made. For most of fusion’s history, the field narrowed almost entirely to the tokamak. The American roadmap explicitly reopens that question. It states that, for reasons of confinement physics and engineering simplicity, the lowest-cost power plant may not be a tokamak — and it names the cylindrical, axisymmetric concepts (magnetic mirrors, field-reversed configurations, Z-pinches) as offering substantial manufacturing advantages. Among the private demonstrators it lists are magnetic-mirror machines in the Wisconsin axisymmetric-mirror lineage.
I note this not to claim vindication — that would be premature and unbecoming — but because it tells India something important: the global frontier is no longer monolithic, and a well-reasoned bet on a simpler magnetic geometry is now a respectable position, not a contrarian one. India should feel free to back more than one horse.
Equally, the document teaches restraint. It is unsentimental about what remains unproven: scientific gain (Q greater than one) has still not been demonstrated in a magnetic mirror; no fusion blanket has yet been built and validated anywhere in the world; tritium self-sufficiency is an open engineering problem. Any Indian programme — public or private — that promises grid electricity in seven years is not to be believed. The credible near-term value of fusion machines lies, as the Americans acknowledge in their own text, in spin-offs: neutron sources for nuclear medicine, materials testing, and industrial applications, well before they deliver net power. A staircase that earns its way up, application by application, is more honest and more financeable than a single leap to a power plant.
Where India can genuinely lead
Two areas deserve particular Indian attention.
The first is the convergence of artificial intelligence and fusion. The Americans have wrapped this in a national programme — the Genesis Mission — and a “Digital Convergence Platform” of foundation models, digital twins, and surrogate codes intended to compress design cycles across every challenge area. This is the one lane where India’s comparative advantage is unambiguous. We have the software talent, the computing culture, and the high-performance computing infrastructure to be a contributor rather than a follower. Integrated, AI-accelerated simulation is not capital-intensive in the way a neutron source is; it is talent-intensive, and talent is what we have in abundance.
The second is regulation. The American document is built on a clear principle, now being written into US rule-making: fusion should be regulated for its actual risks, not folded into the heavier framework built for fission. Fusion involves no fissile material, no chain reaction, no possibility of meltdown. The argument — made forcefully in recent American policy work — is that a right-sized, fusion-specific regime is itself a competitive advantage, because it lets a country iterate through prototypes at a speed that over-regulation would forbid. India is at the very beginning of writing its own fusion regulatory and licensing framework. We have a rare chance to get the proportionality right from the start, rather than inheriting it from fission by default. We should take it.
A roadmap of our own
The deepest lesson of the American document is not any single facility or instrument. It is that the United States found it necessary to write the thing down — to convene more than eight hundred scientists from laboratories, universities, and companies, and to commit to a shared, public, regularly updated map against which progress can be measured.
India has the institutions, the scientific lineage, and now the beginnings of a private fusion sector. What we do not yet have is a national fusion roadmap that does for our ecosystem what this one does for theirs: align the public programme behind enabling the private one, name the gaps honestly, and assign the milestones. Drafting that document — soberly, without hype, and with the private sector at the table rather than outside the room — would be a worthy next step. The Americans have shown us the form. The content must be ours.