The hydrogen economy is coming! The British Energy Security Strategy has the growth of hydrogen as one of the cornerstones for development. What does this mean for gas analysis measurements for improved efficiency and how measurement an help the drive to Net Zero? At the moment we are quite dependent on grey hydrogen, and we are concerned with monitoring impurities from PSA (Pressure Swing Adsorption) processes like CO, CO2 and CH4. Electrolysers are being scaled up and competitively produced and need direct H2 and O2 measurements. As hydrogen gets mixed with other fuels, then blending applications may need H2, H2O, O2, C2H4, CH4 and even HCO2H.