STOFF2 makes hydrogen: Secure, cost-effective, green! A technology that finally puts 2 and 2 together. We have developed an electrolyzer with a new innovative technology: the Zinc-Intermediate Electrolyzer. This hydrogen generating technology is flexible and has an integrated energy storage function. It offers the combined functions of a battery and an electrolyzer. As a result, it is ideally suited to produce hydrogen from volatile renewable electricity in a cost-effective and CO2-neutral manner.