Green hydrogen, produced through the electrolysis of water using renewable energy sources like solar or wind, represents a cornerstone of the global energy transition. Unlike "grey" hydrogen derived from fossil fuels, green hydrogen emits no carbon dioxide during production, making it a vital tool for decarbonizing hard-to-abate sectors such as heavy industry, transportation, and power generation. As of January 2026, the sector is at a pivotal juncture. After years of hype an

Green hydrogen, produced via electrolysis using renewable energy, is pivotal for decarbonizing industries such as steel, chemicals, and transportation. However, its global adoption hinges on standardized definitions, emissions thresholds, and certification processes to ensure environmental integrity, facilitate trade, and attract investments. This revised note provides a comprehensive understanding of available international and regional standards as of early 2026, incorporat