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GREEN HYDROGEN COST REDUCTION the cost exponents from Böhm et al (Böhm et al., 2020). The largest economies of scale are reaped around the 1020MW module size. Beyond this point, the marginal cost decrease for increasing the capacity is much lower than for module sizes in the 12MW range. The “PlanDelyKad” study in Germany performed a bottom-up design and cost assessment finding close to 50% cost reduction for a 100 MW alkaline electrolyser (EUR2014 520/kWinput) vs a 5MW electrolyser (EUR2014 1070/kWinput) (Noack et al., 2015). One of the manufacturers, Thyssenkrupp, claims significant cost benefits can still be achieved by going to 100 MW. Today, the largest electrolyser installed is a 10 MW facility in Fukushima, Japan, which is a single stack (FCW, 2020). Thyssenkrupp and NEL already offer designs up to 20 MW, achieved with multiple stacks (thyssenkrupp, 2018; Nel, 2019) without degradation in the efficiency or response capability of the electrolyser. The largest module from McPhy Figure2i6s 4 MW (McPhy, 2020), while the Sylizer 300 from Siemens is designed for 17.5 MW, constituted by 24 modules (of less than 1 MW each) (Bergen, 2019). Cummins (Hydrogenics) is building a 20 MW PEM water electrolyser in Becancour-Canada, based on stack platforms of 2.5 MW. The plant is expected to be operational before the end of 2020. Another approach applied by some AEM manufactures is a strategy that focuses on design, achieving cost reduction by mass-manufacturing, standardisation, and supply efforts on a single stack offering. Larger capacities are achieved by usingmultiplestacksofthissinglesize.Advantages include: the different flexibility response (i.e. a set of smaller electrolysers can react more quickly than a single, large stack); a reduction in the impact of failure by a single unit; and a higher utilisation of the manufacturing equipment. Figure 26. 1400 1400 1200 1200 1000 1000 800 800 600 600 400 400 200 200 00 Electrolyser investment cost as a function of module size for various technologies. 0 10 20 30 40 50 60 70 80 90 100 0 10 20 30 40 50 60 70 80 90 100 Source: Saba et al., 2018; Proost, 2020. 72 Alkaline - 2020 (This report) Alkaline 1 atm - 2014 (Saba et al., 2018) Alkaline (Proost, 2020) Module size (MW ) Module size (MWel) el PEM - 2020 (This report) Alkaline - 2020 (This report) PEM - 2020 (This report) Alkaline 1 atm - 2014 (Saba et al., 2018) Alkaline (Proost, 2020) Investment Cost (USD/kW) Investment Cost (USD/kW)PDF Image | GREEN HYDROGEN SCALING UP ELECTROLYSERS
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