Stellaria – Weekly Recap

Stellaria – Weekly Recap

Stellaria, a developer of molten-salt small modular reactors, featured prominently this week as it outlined progress on both its commercial strategy and technology roadmap. This recap reviews the company’s latest customer agreement, policy alignment efforts in Europe, and advances in its nuclear R&D collaborations.

Stellaria disclosed that it signed a power pre-order agreement in summer 2025 with Equinix, a leading global data center operator, to supply decarbonised, dispatchable 24/7 energy with a low land footprint. The arrangement is framed as a differentiator versus early-stage SMR peers, providing a concrete commercial contract rather than only pitch materials or non-binding letters.

The Equinix agreement is linked to the objectives of the European SMR Alliance, whose Target 1 calls for tripartite structures between public entities, SMR developers, and industrial energy users. Stellaria suggests this contract could form the commercial basis for such a model, starting with a data center in France and potentially extending to other European locations.

From a financial perspective, the Equinix pre-order could offer early revenue visibility and external validation for Stellaria’s Stellarium reactors in the data center market. However, key details such as financial terms, project timelines, permitting status, and execution milestones remain undisclosed, leaving uncertainty around the scale and timing of any cash flow impact.

Strategically, Stellaria is positioning its molten-salt SMR technology within the European Union’s push to treat nuclear and renewables as dual pillars of energy sovereignty. The company emphasizes criteria such as cost control, dispatchable power, industrial-scale deployment, and design simplicity, while noting rising competitive pressure from markets like China and the U.S.

Stellaria also highlighted the European SMR Industrial Alliance’s second call for projects, focused on advanced European-origin technologies. It aims to present its technology as a strong candidate for this framework, which could improve access to policy support, public-sector partners, and financing linked to decarbonisation and energy security objectives.

On the R&D front, Stellaria announced a Letter of Intent with France’s CEA to conduct a feasibility study for the INB ALPHA facility at the Cadarache site. The proposed installation would host a fast-spectrum molten-salt liquid-fuel demonstration reactor, a test mock-up, and a salt fabrication unit, embedding Stellaria within France’s established nuclear research ecosystem.

The INB ALPHA platform is intended to support “Alvin,” a critical experiment targeted around 2030 to validate Stellaria’s neutronics and thermohydraulic models, followed by a larger “MegAlvin” initiative. This multi-stage roadmap underscores long development timelines but, if successful, could underpin future commercial deployment across European industrial and digital infrastructure markets.

Overall, the week underscored Stellaria’s dual-track progress, combining an early commercial foothold with Equinix and deepening integration into European nuclear policy and R&D structures, while execution risk and long-dated revenue horizons remain central considerations for stakeholders.