Green hydrogen production via electrolysis uses electricity from renewable sources, such as wind and solar, to split water into hydrogen and oxygen in an electrolyser, yielding hydrogen with no direct carbon emissions; in Castellón, BP and Iberdrola are commissioning a 25‑megawatt electrolyser to supply green hydrogen mainly to a local refinery, replacing fossil‑based hydrogen. While this plant is not directly the source of Arkadia’s satellite propellant, it illustrates the broader local ecosystem of hydrogen technologies and the region’s experience in producing hydrogen classified as "green" under European standards.
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