BP has made a final investment decision on its largest green hydrogen project at the Castellon refinery in Spain, in partnership with Iberdrola. The project, initially announced as part of the HyVal cluster with a planned €2 billion investment for 2 GW in electrolyzer capacity by 2030, has now been scaled down to just 25 MW of capacity. Further details, including installation timelines and costs, remain undisclosed by BP. The green hydrogen produced will replace grey hydrogen in refining operations and support biofuel production, particularly sustainable aviation fuel (SAF). Industrial giants like BP are, willingly or not, aiding the electrolyzer sector by accelerating demand which will in turn have a positive effect on the price of hydrogen. And yes, Opex…