HyCOMB

With the increasing share of non-programmable renewables, the energy challenge is no longer just producing clean electricity, but also conserving it over time and realigning it with real demand profiles. In this scenario, hydrogen stands out not so much for its efficiency round-trip, lower than that of electrochemical systems, but for its ability to operate as a long-term storage medium and to connect electricity, gas, and heat. This multi-vector nature makes hydrogen attractive in industrial contexts, where flexibility is measured not only in hours of discharge, but also in the possibility of transferring renewable energy to end uses that are difficult to electrify, including thermal consumption. Unlike electrochemical systems, which are particularly effective in short-term balancing, hydrogen systems Hydrogen Energy Storage (HES) allow large amounts of energy to be stored for longer periods, even reaching weekly or seasonal storage rates. The electrolysis-compression-storage-end-use chain entails energy penalties, but introduces a structural advantage in the possibility of transforming excess renewable energy into a molecule that can be stored, transported, and used even outside the strictly electrical perimeter. For this reason, hydrogen is currently being analyzed as a renewable energy option. Long-duration Energy Storage (LDES), especially in energy systems with high renewable penetration. In the HyCOMB project, this logic takes on a particularly relevant form, as hydrogen is not treated as a simple electrolyzer output, but as a node for storing and exploiting photovoltaic energy in a real industrial system. HyCOMB aims to validate the system's ability to transform renewable electricity surpluses into operational flexibility, reduced natural gas consumption, and progressive decarbonization of thermal consumption at industrial sites.

Anion-exchange membrane electrolyzers, or AEMs, are considered one of the most exciting trajectories in the development of green hydrogen because they seek to combine the strengths of alkaline and PEM technologies. On the one hand, they aim to reduce the use of noble catalysts and critical materials, while on the other, they maintain a compact and dynamically more flexible configuration than traditional alkaline electrolysis. In theory, this makes them ideal candidates for distributed, modular, and integrated systems with variable renewable sources. In practice, however, the gap between good laboratory performance and industrial reliability remains the technology's true testing ground. Critical issues include membrane chemical stability, water management, the electrode-membrane interface, degradation under dynamic conditions, and the difficulty of maintaining high performance without accelerating aging. In the HyCOMB context, interest in AEMs is aimed at validating an emerging technology, potentially more sustainable and better suited to modular configurations, by incorporating it into an integrated system. HyCOMB aims to verify the interoperability of AEMs with the rest of the plant and digital architecture, while validating the technology's role as a tool for system flexibility.

Blending hydrogen and natural gas is currently considered one of the most immediate strategies for introducing hydrogen into existing systems without waiting for a complete infrastructure conversion. Its strength is clear, as it allows the use of existing networks, appliances, and utilities to achieve an initial reduction in climate-altering emissions and create demand for renewable hydrogen. However, the presence of hydrogen in fuel blends alters fundamental properties, including flame speed, flammability limits, volumetric energy density, ignition behavior, and emissions dynamics, with effects that depend heavily on the type of infrastructure and, above all, the end user. The best-known European trials, such as HyDeploy and THyGA, have shown that many residential and commercial applications can tolerate blends with even significant hydrogen percentages, often up to approximately 20% by volume, without significant impacts on safety and basic functionality. At the same time, the literature emphasizes that blending is not a one-size-fits-all threshold, as materials, operating pressures, measuring instruments, network components, and burner type significantly influence technical feasibility. In HyCOMB, the most interesting technical issue concerns industrial thermal applications, contexts in which blending is not just a matter of grid compatibility, but also of combustion stability, flame quality, heat transfer, and operational continuity. Recent studies show that hydrogen can improve some aspects of combustion, but as its share increases, it can also increase the complexity of burner control and generate nonlinear effects on emissions, which vary from technology to technology. This is where real-world testing becomes essential to define the extent to which it is truly manageable, efficient, and safe at a specific industrial site.

In complex industrial energy systems, simply monitoring consumption is no longer sufficient to ensure efficiency and sustainability. Modern energy management systems energy management are based on advanced digital models, capable of dynamically representing the behavior of energy assets and supporting real-time operational decisions. In this context, the approach based on digital twin allows for the integration of renewable energy generation, storage systems, and industrial loads within a single control architecture. The evolution toward predictive control logic allows for the anticipation of system operating conditions, optimizing the use of energy resources based on variables such as renewable energy availability, internal demand, storage state of charge, and grid signals. This approach not only reduces energy costs but also minimizes the production site's carbon footprint while improving operational flexibility. In the HyCOMB project, these principles are applied to the integrated management of photovoltaics, electrochemical storage systems, and electrolysis for hydrogen production. The HyCOMB-Cloud platform allows for the coordination of different energy vectors and optimization of system operation based on multiple objectives, including efficiency, sustainability, and interaction with the electricity grid. In this way, theenergy management evolves from a monitoring tool to a central element for the intelligent management of industrial energy systems.