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Several hydrogen blend trials are underway in Europe, with significant projects in the Netherlands, Portugal, and Germany. The European Clean Hydrogen Alliance, formed in 2020, released a report in April 2025 detailing these efforts.

Notable initiatives include the 'Hydrogen City' project in the Netherlands, a 12% hydrogen blend project by Floene in Portugal, and a 100% hydrogen supply trial in Bavaria, Germany. These projects aim to integrate hydrogen into existing gas infrastructure, with goals set for completion by 2030.