Tech pipeline to see green H 2 costs tumbleâCeraWeek Electrolyser improvements may soon reduce costs to a level competitive with natural gas-based hydrogenâand high-temperature methods show promise for future Technological developments across a range of established and experimental production methods could rapidly reduce the cost of green hydrogen to the point it is competitive with grey hydrogen, a panel of industry experts agreed yesterday at CeraWeek. Despite electrolyser technology being established for decades, green hydrogen has been slow to take a significant share of the hydrogen market because costs have remained stubbornly high relative to supply sourced from natural gas.