MUNICH – German laser-fusion startup Marvel Fusion and global energy technology firm Siemens Energy have launched a strategic partnership to accelerate the design of commercial fusion power plants. The collaboration, announced Sunday, aims to combine Marvel's novel approach to inertial fusion energy with Siemens Energy's extensive experience in developing and constructing large-scale energy systems. This alliance marks a significant step in translating advanced fusion science into a viable, industrial-grade power source by directly tackling the complex engineering challenges of a future plant.

Marvel Fusion is pursuing an aneutronic fusion reaction using a proton-boron (p-B11) fuel cycle, a departure from the more common deuterium-tritium approach. Their method employs high-intensity, short-pulse lasers directed at proprietary nanostructured fuel targets to trigger fusion without generating high-energy neutrons. This approach could drastically simplify reactor design, eliminate the need for a tritium breeding blanket, and reduce the long-term radioactive waste associated with traditional fusion concepts.

Marvel Fusion is pursuing an aneutronic fusion reaction using a proton-boron (p-B11) fuel cycle, a departure from the more common deuterium-tritium approach.

Under the agreement, Siemens Energy will contribute its deep expertise in power plant engineering, including energy conversion systems, high-voltage electrical equipment, and grid integration technology. The initial phase of the partnership will focus on modeling the heat-transfer mechanisms and developing a concept for the balance of plant—the critical infrastructure that converts the energy released from fusion into electricity. This work is essential for creating a commercially competitive and reliable power plant architecture.

The joint effort will leverage Marvel Fusion’s new research facility in Colorado, which houses a 3-petawatt laser system scheduled for commissioning in late 2027. Data from experiments at this facility will inform the power plant design, helping to validate the physics and refine the engineering requirements for a full-scale system. The collaboration will specifically address the challenge of efficiently capturing energy from the alpha particles produced in the p-B11 reaction and converting it into usable heat for a conventional steam turbine cycle.

Financially, the partnership involves a multi-year, multi-million euro commitment from Siemens Energy, though specific figures were not disclosed. This investment provides Marvel Fusion with crucial engineering resources and a clear pathway for commercialization, de-risking the later stages of development. For Siemens Energy, the collaboration represents a strategic entry into the burgeoning fusion industry, positioning the company at the forefront of a potentially transformative clean energy technology.

While promising, the p-B11 fusion approach faces significant scientific hurdles, requiring far higher temperatures and plasma densities than D-T fusion to achieve ignition. Marvel's success hinges on demonstrating that its laser and nanostructured target technology can overcome these challenges to produce a net energy gain, a milestone the company hopes to achieve by the early 2030s. The collaboration with an industrial heavyweight like Siemens Energy is intended to ensure that once the physics are proven, the engineering path to a power plant is already well-defined.

Looking ahead, the partnership's first major milestone is the delivery of a comprehensive conceptual power plant design by the end of 2028. This design will serve as the blueprint for a planned prototype facility, with a site selection process expected to begin in 2029. The ultimate goal remains the construction of a first-of-a-kind 150 MW commercial power plant, with a target commissioning date in the late 2030s, contingent on successful physics demonstrations in the coming years.