Siemens Energy: Green Hydrogen Siemens Energy, headquartered in Munich, Germany, is a leading global energy company operating across the full energy spectrum, from conventional to renewable sources, and from grid solutions to energy storage. The company has a presence in 90 countries worldwide. This IDTechEx profile focuses on Siemens Energy's green hydrogen operations. IDTechEx spoke with Siemens Energy at the Hydrogen Technology & Carbon Capture Technology World Expo 2025 in Hamburg, Germany. Siemens Energy: Green Hydrogen