UK CAA Hydrogen Challenge Hydrogen Sandbox Summary Report 2025/2026

The Civil Aviation Authority is publishing its UK CAA Hydrogen Challenge Hydrogen Sandbox Summary Report 2025/2026

This report presents the outcomes of the CAA’s Hydrogen Sandbox activities where eleven organisations collaborated with the UK CAA to explore hydrogen-related safety risks, improve regulatory readiness, and support net-zero policy development. It outlines project activities and outcomes as well as highlighting next steps and lessons learnt.