The principal obstacle in the adoption of green hydrogen for reduction of carbon emissions has been commercial rather than technological, as industrial users seeking to transition must fund and operate a dedicated electrolyser plant for a term of fifteen years or more. The “Electrolyser as a Service” (EaaS) model addresses this constraint. Under the EaaS model, a technology provider (Service Provider) designs, finances, constructs, owns, operates and maintains an electrolytic hydrogen generation plant (Project) on a build-own-operate basis at the premises of the industrial user (Consumer). The Consumer thereby secures a reliable, on-site supply of green hydrogen without any upfront capital outlay and acquires no title to the Project. Capital expenditure risk is thereby mitigated and converted into a predictable operating cost, while construction, technology and performance risks pass to the party best placed to manage them.