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When the dimension of potential for cost reduction is combined with the current share of total system cost of each component, some clear priority areas for innovation emerge. Power supply is the single largest area where cost reduction could be achieved (see Figure 19). Bipolar plates, although with a lower cost reduction potential, also represent almost a quarter of the total PEM electrolysis system cost and should be a priority area. Other balance of plant components, like water circulation and hydrogen processing, also represent important areas where cost reduction can be achieved. Figure 19. 30% 20% 10% 0% Based on IRENA analysis. SCALING UP ELECTROLYSERS TO MEET THE 1.5°C CLIMATE GOAL System components for a 1 MW PEM electrolyser classified based on contribution to total system cost and potential for cost reduction. Deionized Water Circulation Hydrogen Processing Porous Transport Layer (PTLs) Manufacturing Cooling PFSA Membrane Medium High Potential for cost reduction Stack assembly and end plates Iridium Platinum Bipolar Plates (BPs) Power Supply Low 53 Fraction of the total system cost (%)PDF Image | GREEN HYDROGEN SCALING UP ELECTROLYSERS
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