Low-carbon and cost-efficient hydrogen optimisation through a grid-connected electrolyser: The case of GreenLab skive

Power-to-X technologies are a promising means to achieve Denmark's carbon emission reduction targets. Water electrolysis can potentially generate carbon-neutral fuels if powered with renewable electricity. However, the high variability of sources threatens plant's cost-efficiency, instead favouring and constant operation rates. Therefore, diversified electricity supply is often an option maximise load factor systems. This paper analyses impact using different power on cost production intensity hydrogen produced by system. GreenLab Skive, world's first industrial facility integrated into symbiosis network, has been used as case study. Results show that wind/PV/grid-connected electrolyser for reduce operational costs emissions, saving 30.6 × 10 7 kg CO2 having Net Present Value twice higher than grid-connected electrolyser. In addition, coefficient this configuration 3.5 −2 H2 /kg against 7.0 g /g Steam Methane Reforming. A sensitivity analysis detects optimal capacity ratio between renewables plateau reached performances, suggesting wind/grid-connected setup wind farm three times size demonstrate not competitive yet electricity, investment but be current price less capacity. • Green key profitable investment. Danish green uncompetitive today's market price. By sizing onshore properly, cheaper blue hydrogen. emissions production.