Ontario-headquartered Nuclea Energy has entered into a definitive agreement to acquire UK-based Moltex’s advanced nuclear technology portfolio, including its used nuclear fuel recycling process and reactor technologies, following a competitive bidding process.
Nuclea is designing the Morpheus microreactor, a compact, transportable and factory-fabricated lead-cooled, graphite-moderated microreactor currently in the conceptual design stage. Nuclea said acquisition of the Moltex assets would extend Nuclea’s technology portfolio into advanced modular and potentially grid-scale nuclear generation, as well as used-fuel recycling.
UK-based parent company, Moltex Energy Limited, entered administration in March 2025 due to severe cash flow shortages and a failure to secure vital shareholder approval for new funding. According to the appointed administrators, Azets, the company collapsed due to two specific boardroom roadblocks. The company’s directors were unable to achieve the required majority shareholder consent to approve new investment rounds needed to sustain their high-cost nuclear R&D. Internal pushback also prevented the company from selling off selective assets or intellectual property early enough to prevent a total cash depletion.
Faced with a critical risk of insolvency, the directors resolved to enter administration to protect the business and find an outside buyer capable of funding the technology. However, the administration was only a corporate financial failure at the UK parent level. Azets noted that the decision was “in no way a reflection on the operations” or viability of the technology. Because of this, Moltex’s active operational subsidiaries – Moltex Energy Canada and MoltexFLEX – were legally protected and continued trading normally throughout the process.
This operational continuity allowed the Canadian branch to maintain its regulatory work with the Canadian Nuclear Safety Commission, keeping the assets intact until Nuclea Energy could stepped in with its all-cash acquisition bid in August 2026.
Moltex’s technologies include the WATSS (for Waste to Stable Salt) recycling process; the Stable Salt Reactor – Wasteburner (SSR-W), a molten salt fast reactor technology using recycled nuclear waste as fuel; and FLEX, a thermal spectrum version of the SSR technology.
The WATSS technology focuses on pyrochemical extraction chemistry rather than standard reactor hardware. In June Moltex validated key stages of the WATSS process using irradiated commercial Candu fuel at Canadian Nuclear Laboratories’ Chalk River facilities. WATSS extracts transuranic actinides from used fuel and blends them into liquid chloride salts, entirely bypassing the creation of pure plutonium streams to reduce proliferation risks. Moltex initiated pre-licensing consultations with the Canadian Nuclear Safety Commission (CNSC) in mid-2025.
The SSR-W is a 300 to 500 MWe fast-spectrum molten salt reactor engineered to burn the salt fuel created by WATSS. Moltex previously partnered with NB Power to target deployment of a first-of-a-kind SSR-W unit at the Point Lepreau nuclear site in New Brunswick. The design completed Phase 1 of the Vendor Design Review (VDR1) with the CNSC. Under Nuclea’s ownership, the engineering focus will shift to advancing into VDR Phase 2 and applying for site-specific construction licences
The FLEX Reactor, developed primarily via the UK-based affiliate MoltexFLEX, is a thermal spectrum version of the stable salt technology optimised for flexible industrial heat and power output. energy storage system utilising large tanks of molten salt allows the reactor to run 24/7 at base load while storing heat to dispatch as peaking power when grid demand spikes.
The target portfolio was developed over more than a decade, with more than CAD96m ($69m) of private, Canadian and US public-sector funding. It is expected to include technology and development materials associated principally with WATSS and SSR-W, with 80 granted patents across nine patent families in advanced nuclear technology (including nuclear fuel, reactor, chemistry and materials) as well as nine pending patents on the fuel recycling process.
“We believe the nuclear sector is entering a sustained period of strategic investment driven by the increasing competition in nuclear developments between east and west, energy security, grid reliability, industrial electrification and growing demand for large volumes of dependable, low-carbon power driven by the new digital age,” said Josef Freundorfer, Nuclea’s CEO. “This agreement is designed to broaden Nuclea’s position within the nuclear sector by adding a pair of advanced reactor designs and nuclear fuel-cycle technology that are complementary to our Morpheus microreactor. Importantly, this is an asset-led transaction at what we believe is a disciplined entry point, with future capital deployment governed by clearly defined technical, regulatory and commercial milestones.”
Moltex CEO Rory O’Sullivan noted: “This is a very exciting outcome for Moltex and an important recognition of the value created by our team, shareholders, partners and supporters over more than a decade. Nuclea provides a strong platform from which to build on what we have achieved and take these technologies into their next phase.”
Completion remains subject to certain closing conditions, including the required approval under the UK’s National Security and Investment Act 2021. Following completion, Nuclea intends to retain Moltex Energy Canada as a focused research, engineering and regulatory-development business supporting the continued advancement of the acquired technologies.
Nuclea recently entered into a definitive business combination agreement – subject to customary closing conditions, including stockholder and regulatory approvals – with Mangoceuticals, a transaction it says will provide Nuclea with a path to public listing. This, it says, will broaden its access to the capital markets to fund the continued development, licensing, and commercialisation of its Morpheus technology.
The company has also recently signed a memorandum of understanding with the State of Utah Office of Energy Development to explore the siting of a nuclear test reactor at the Utah San Rafael Energy Lab to advance deployment of the Morpheus reactor. Earlier in August, it signed a non-binding memorandum of understanding with New Mining Co, a provider of high-density digital infrastructure and computing hosting services, to evaluate the feasibility of deploying Nuclea’s modular reactor technology to serve behind-the-meter power needs.
