With growing concerns over energy security, fluctuating fossil fuel prices, and ambitious climate commitments, the shift to renewables and cleaner technologies is no longer a distant goal, it is a necessity driven by both environmental imperatives and geopolitical realities. Among these technologies, hydrogen is recognised as a versatile energy carrier with great potential.
However, even if hydrogen gained traction in the clean energy transition, significant challenges still stand in the way of developing a scalable hydrogen economy. While hydrogen is seen as a game-changer in decarbonizing industries such as steelmaking, heavy transport, and aviation, the costs of production, infrastructure requirements, and regulatory framework are areas that need urgent attention. Additionally, hydrogen production and use still raise some unresolved questions regarding:
• Its indirect Global Warming Potential - though hydrogen itself is not a greenhouse gas, its increased leakages can alter the atmospheric budget and disrupt atmospheric chemistry, indirectly impacting the removing mechanisms of other gases (e.g. methane);
• Its demand for land and resources - large hydrogen projects may compete with other clean energy sources for land, and water-intensive electrolysis processes raise concerns about energy justice;
• Its flammability and explosive nature - hydrogen is highly flammable and could lead to fire hazards, particularly in confined spaces. However, leakages are difficult to detect without specialized sensors.
The HYDRA project is a key initiative aiming to address these challenges, assessing both the benefits and risks of a hydrogen-based economy while developing tools and guidelines to mitigate potential climate impacts and enhance safety, thus ensuring the integration of hydrogen into the energy transition is both effective and responsible.
One of the project primary objectives is to investigate hydrogen interactions within the atmosphere and, ultimately, its overall impact on climate. HYDRA will estimate hydrogen emissions along its entire lifecycle, from production and transport to storage and use, examining their effects on atmospheric components such as carbon monoxide (CO), nitrous oxide (N2O), methane (CH₄), and ozone (O₃). Through advanced climate modeling, HYDRA will estimate hydrogen radiative forcing and explore potential climate change scenarios linked to its large-scale deployment.
Beyond atmospheric and climatic effects, HYDRA also examines the broader socio-economic and energy transition dimensions of hydrogen deployment. Using the Integrated Assessment Model (IAM) WILIAM, previously developed in other EU projects (e.g. LOCOMOTION), the initiative will evaluate hydrogen impact on land use, water resources, economy, and society. This model will also allow HYDRA to simulate potential mitigation measures in response to any identified negative effects, whether on climate, the environment, or society, ultimately informing policymakers through guidelines for the sustainable development of the hydrogen economy.
The project also places significant emphasis on safety. Given hydrogen flammability and the risks associated with leakages, HYDRA is developing an advanced leakage detection technology that will undergo rigorous testing throughout the four-year research period.
