Introducing Our NuPlant Spec Sheets

I joined nTtau Digital as an intern in my final year of university, before I even had my degree. At the time, I could never have imagined how much the company was going to grow, or how much I would grow alongside it. I didn't know I'd still be here two years later, but something about the problem, and the people trying to solve it, made me stay. After graduating in 2024, I returned on a rolling internship. For the next year, we delivered simulation services to customers - individual projects that each felt meaningful in isolation. What I didn't fully appreciate until recently was that all of it was pointing somewhere; we were always building toward a pipeline. Toward something connected, auditable, and repeatable. We just didn't have a name for it yet.

Gradually, the work got bigger and the ambitions got louder. I found myself not just running simulations but helping build the pipeline that runs them; watching individual workflows, previously stitched together by hand, give way to a single platform that runs the whole chain without a human in the middle. It's one of the more satisfying things I've been part of so far. Satisfying, because I know exactly how hard each of those steps was.

NuPlant is nTtau Digital's whole-plant design, simulation and optimisation platform. Starting from a plasma boundary specification, it automatically generates a complete parametric CAD model, runs coupled multiphysics simulations across magnetics, neutronics, thermal and structural physics, and rolls the results into a transparent, auditable cost model - capital cost and LCOE you can actually defend in a due-diligence room. It runs entirely on open-source codes including VMEC, SIMSOPT, OpenMC, MOOSE and PyFECONS, so there are no per-seat licences, and the same workflow deploys unchanged from a laptop to an HPC cluster or a fully air-gapped facility. Costing is built on the published PyFECONS framework using a standardised 23-account structure.

Over the coming months, we'll be publishing a series of technical spec sheets as examples of our real analyses, run on real concepts, through the full NuPlant pipeline. Each one shows exactly what the platform produces: parametric CAD, multiphysics results, multi-objective optimisation, bottom-up cost model. Today, we're releasing the first.

We ran the full pipeline on a Wendelstein 7-X-based stellarator - one of the most thoroughly documented fusion devices, which made it an ideal test case. The results show something genuinely striking: the same plasma boundary yields visibly different coil geometries depending on whether you steer the optimiser toward cost, engineering robustness, or physics performance. That's the whole point of a platform like this. The design space is vast, and you want a machine exploring it.

The company I work for now is not the same one I walked into as an intern. It's grown in ambition, in capability, and in the seriousness with which the fusion sector is taking us. I've grown with it, moving from someone running individual simulations to someone who now spends half their time learning to build software, thinking about how tools get used and how workflows get trusted. Seeing NuPlant become a real SaaS product, seeing licences sold, and seeing the pipeline we built actually running for other people, means something important to all of us at nTtau Digital. It's what we were always building toward, even before we quite knew what it was.

If you want to see what NuPlant produces, download the spec sheet. If you want to run your own concept through it, fill in the form on the final page and send it to info@nttaudigital.com. If you'd prefer to talk it through first, you can request a demo, start a 30-day pilot, or get in touch with us directly. We'll come back to you within 3–5 business days.

View the spec sheet here:

nTtau_Digital_Spec_Sheets (2).pdf

Download PDF • 3.10MB