From Renewable Electricity to Trusted Hydrogen: How LuxHyVal Is Building Transparency into the Green Hydrogen Economy

Hydrogen is often presented as one of the key building blocks of Europe’s decarbonised future. But not all hydrogen is created equal. Whether hydrogen genuinely contributes to climate neutrality depends not only on how it is used, but also on how it is produced — and, critically, on how its renewable origin can be demonstrated transparently and credibly.

This is one of the central challenges addressed by LuxHyVal, Luxembourg’s flagship hydrogen valley initiative. Beyond building infrastructure, the project is helping to establish the foundations of trust that a future European green hydrogen market will require renewable electricity sourcing, traceability, certification, and transparent proof of climate impact.

Building a Hydrogen Valley Around Renewable Electricity

LuxHyVal aims to create a fully integrated hydrogen ecosystem in Luxembourg, linking renewable electricity production with hydrogen generation, storage, distribution, industrial use, and zero-emission mobility applications. The project brings together infrastructure developers, energy suppliers, mobility operators, industrial users, research institutions, and public actors in a coordinated demonstration of how renewable hydrogen can function within a real economy.

At the centre of the project is a planned 5 MW PEM electrolyser in Bascharage, expected to begin operation from end of 2027 onward. The electrolyser will use electricity to split water into hydrogen and oxygen, producing renewable hydrogen for multiple applications across Luxembourg.

The hydrogen produced through LuxHyVal is planned to support both mobility and industrial decarbonisation. Hydrogen buses operated by Sales-Lentz and TICE are among the first mobility applications envisioned within the project. At the same time, industrial use cases at Ceratizit demonstrate how hydrogen can contribute to reducing emissions in hard-to-abate industrial sectors.

The project targets production of more than 300 tonnes of renewable hydrogen annually. In addition to physical infrastructure such as electrolysis, storage, and compression systems, LuxHyVal also integrates digital optimisation tools and energy management approaches intended to improve operational flexibility and system integration. These digital components will help align hydrogen production with renewable electricity availability and evolving electricity market conditions.

Why Renewable Electricity Matters

Hydrogen itself does not contain carbon, but the environmental impact of hydrogen depends entirely on the energy source used to produce it.

Today, most hydrogen globally is still produced from fossil fuels, primarily natural gas. This conventional production pathway is commonly referred to as “grey hydrogen” and generates significant carbon emissions. Another pathway, “blue hydrogen,” combines natural gas-based production with carbon capture technologies intended to reduce emissions. “Green hydrogen,” by contrast, is produced using renewable electricity through electrolysis.

For LuxHyVal, renewable electricity sourcing is therefore not a secondary issue — it is fundamental to the project’s climate objective.

The project plans to source renewable electricity through Power Purchase Agreements (PPAs) connected to renewable generation assets, notably photovoltaic production in Bavaria and wind generation in Saarland.

Because renewable electricity generation varies according to weather conditions, the LuxHyVal electrolyser is also expected to operate flexibly. Rather than running continuously at fixed output, hydrogen production needs to adapt to varying electricity availability. This flexibility is increasingly recognised as an important feature of future integrated energy systems, where electrolysers can help absorb renewable generation peaks while supporting grid balancing.

However, flexible operation alone does not automatically prove that hydrogen is renewable. In interconnected electricity systems, electrons from many generation sources mix physically within the transmission network. The challenge therefore becomes one of traceability and accounting: how can a hydrogen producer demonstrate that renewable electricity has genuinely been sourced and allocated to hydrogen production?

This is where Guarantees of Origin become essential.

Guarantees of Origin: Creating Transparency in Renewable Energy Markets

Guarantees of Origin, commonly referred to as GoOs, are electronic certificates that verify renewable electricity production. In most cases, one GoO corresponds to one megawatt-hour (MWh) of renewable electricity generated from sources such as wind, solar, or hydropower.

Although electricity flows physically through interconnected grids without distinction between renewable and conventional electrons, GoOs create a transparent accounting mechanism. They allow renewable electricity generation to be tracked independently from the physical power flows themselves.

Across Europe, GoOs are widely used for renewable electricity supply contracts and corporate sustainability strategies. They provide consumers, businesses, and energy suppliers with a recognised system for demonstrating renewable electricity sourcing.

For hydrogen projects such as LuxHyVal, GoOs represent an important first layer of proof that electrolysers are powered by renewable energy.

Within the LuxHyVal consortium, Enovos ensures transparent renewable electricity sourcing and documentation. Renewable electricity traceability and GoO management are explicitly integrated into the project’s design and operational planning.

Yet Europe is already moving beyond simple electricity certificates toward more comprehensive hydrogen certification systems.

From Electricity Certificates to Hydrogen Certification

As Europe scales its hydrogen ambitions, policymakers are developing increasingly sophisticated frameworks to ensure that renewable hydrogen delivers genuine climate benefits.

Under the EU Renewable Energy Directive and related delegated acts, hydrogen producers will need to demonstrate more than simply purchasing renewable electricity certificates. Future certification frameworks for Renewable Fuels of Non-Biological Origin (RFNBOs) include several additional requirements.

These include proof of renewable electricity sourcing, but also temporal correlation — demonstrating that hydrogen production aligns in time with renewable electricity generation. Geographic correlation is also important, ensuring that electricity sourcing and hydrogen production occur within connected market regions. In addition, lifecycle greenhouse gas emissions across the production chain will need to be assessed.

These evolving requirements are reshaping how hydrogen projects are designed across Europe.

LuxHyVal has been developed with these future certification requirements in mind. Project planning and commercial agreements already reference compliance with Renewable Energy Directive and RFNBO requirements, helping prepare the project for the regulatory frameworks that will define Europe’s future hydrogen economy.

RFNBO — Renewable Fuels of Non-Biological Origin — may sound highly technical, but the concept is relatively straightforward. In practice, RFNBOs include fuels such as hydrogen produced using renewable electricity rather than fossil fuels or biomass. The objective of RFNBO certification is to ensure that renewable hydrogen delivers real and measurable greenhouse gas reductions across the entire value chain.

The European regulatory framework for RFNBOs is no longer theoretical. Through the Renewable Energy Directive (RED II and its RED III revision) and the associated delegated acts adopted by the European Commission, the EU has established detailed rules defining when hydrogen can officially be recognised as renewable.

These rules include several key requirements:

• Additionality: renewable electricity used for hydrogen production must increasingly come from newly built renewable assets that support the expansion of renewable generation capacity.
• Temporal correlation: hydrogen production must be matched with renewable electricity generation within defined time periods. Transitional hourly matching requirements are progressively being introduced across Europe.
• Geographical correlation: renewable electricity generation and hydrogen production must occur within interconnected electricity market zones or defined geographic boundaries.
• Lifecycle greenhouse gas emissions: RFNBO hydrogen must achieve minimum greenhouse gas emission reductions compared to fossil fuel benchmarks across production, transport, and use.
• Verification and auditing: independent certification and mass-balance systems are required to demonstrate compliance throughout the supply chain.

Guarantees of Origin (GoOs) remain an important part of this framework by providing proof of renewable electricity sourcing, but they are no longer sufficient on their own to demonstrate full RFNBO compliance.

To implement these rules in practice, Europe has developed recognised certification schemes under the EU voluntary certification framework. Several systems have emerged in parallel, including CertifHy, ISCC EU, REDcert EU, designed to verify RFNBO compliance and renewable hydrogen traceability across borders.

LuxHyVal is being developed with these requirements in mind. The project’s commercial structures, renewable electricity sourcing strategy, and operational concepts are designed to align with evolving RFNBO compliance rules, including renewable electricity traceability, flexible electrolyser operation, and certification requirements.

This certification framework plays a central role in enabling industrial decarbonisation, renewable transport fuels, public funding eligibility, and future European hydrogen trade. For industrial users and mobility operators alike, transparent certification is becoming essential to demonstrate that hydrogen use delivers genuine climate benefits rather than simply shifting emissions elsewhere in the energy system.

Trust as a Foundation of the Future Hydrogen Economy

The transition toward renewable hydrogen is a technological challenge but also question of credibility and trust.

Industrial customers increasingly need verifiable low-carbon supply chains. Public authorities and transport operators need robust evidence that hydrogen deployment genuinely contributes to emission reduction goals. Citizens and local communities also expect transparency regarding how “green” hydrogen is defined and verified.

Certification frameworks, renewable electricity traceability systems, and transparent sourcing mechanisms therefore play a central role in enabling market confidence.

LuxHyVal contributes to this European effort by demonstrating how renewable electricity contracts, Guarantees of Origin, hydrogen production, industrial applications, and mobility use cases can be integrated into one coherent ecosystem. In doing so, the project supports the objectives of the European Green Deal, the EU Hydrogen Strategy, REPowerEU, and Luxembourg’s national hydrogen strategy.

Europe’s hydrogen ambitions are ultimately about more than replacing fossil fuels. Renewable hydrogen can help decarbonise industry, improve energy system flexibility, support renewable electricity integration, and reduce dependency on imported fossil energy sources. And achieving these goals requires infrastructure and investment and transparent systems capable of proving environmental performance in a credible and standardised way.

Author

Yves Reuter — Enovos Luxembourg S.A.

Funding disclaimer

The LuxHyVal project has received funding from the European Union’s Horizon Europe research and innovation programme under Grant Agreement No. 101111984 and is co-funded by the Clean Hydrogen Joint Undertaking. Views and opinions expressed are those of the author only and do not necessarily reflect those of the European Union or the Clean Hydrogen Joint Undertaking.