Direct production of highly pressurised hydrogen from electrolytic water splitting can result in significant energy savings compared to downstream gas compression. The EU-funded ADVANCEPEM project will develop an innovative polymer electrolyte membrane (PEM) electrolyser that can produce hydrogen at high pressure (200 bar) and reduce post compression energy consumption. The project will also develop a cost-effective technology permitting large-scale application of PEM electrolysers. ADVANCEPEM will develop Reinforced Aquivion® polymer membranes with enhanced conductivity, high glass transition temperature and increased crystallinity, able to withstand high differential pressures. The project will reduce capital costs by minimising critical raw materials, developing cheap coated bipolar plates, and operating the electrolyser at a high production rate.