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The document examines the transition from natural gas to hydrogen in gas turbines, detailing the physical differences between the fuels and the resulting engineering requirements. It highlights that while low-percentage hydrogen blends (~20% or less) can often be used with minimal modifications, higher blends require significant changes to combustion systems to manage NOx emissions and prevent flashback. The paper reviews the current capabilities and development roadmaps of major OEMs, including Ansaldo Energia, General Electric, Mitsubishi Hitachi Power Systems, and Siemens, most of whom target 100% hydrogen capability by 2030.