Hydrogen produced from renewable electricity through Power-to-Hydrogen can facilitate the integration of high levels of variable renewable electricity into the energy system. An electrolyser is a device that splits water into hydrogen and oxygen using electricity. When electricity is produced from renewable energy sources, electrolytic hydrogen can be considered to be green. At the same time, electrolysers can help integrate renewable electricity into power systems, as their electricity consumption can be adjusted to follow wind and solar power generation. Green hydrogen then also becomes a carrier for renewable electricity. Key green hydrogen production technologies, mostly PEM and alkaline electrolysers, are still further maturing, both in technical (efficiency), economical (CAPEX) and durability (lifetime) performance. Nonetheless, we will show in this contribution how fossil parity for green hydrogen, i.e. a Total Cost of Ownership (TCO) similar to grey H₂ coming from todays CO₂ intensive SMR processes, can already be achieved today. Moreover, this can be realised at a scale which corresponds to the basic units of renewable electricity generation, i.e. a few MW.

可再生能源通过氢能发电产生的氢气可以促进将大量可变可再生能源整合到能源系统中。电解器是一种利用电将水分解为氢和氧的设备。用可再生能源发电时，电解氢可以被认为是绿色的。同时，电解器可以帮助将可再生电力整合到电力系统中，因为可以根据风力和太阳能发电来调整其电力消耗。绿氢然后也成为可再生电力的载体。关键的绿色氢气生产技术（主要是PEM和碱性电解槽）在技术（效率），经济（CAPEX）和耐用性（寿命）性能方面都进一步成熟。尽管如此，今天，已经可以实现_2种来自当今CO ₂密集型SMR工艺的技术。此外，这可以以与可再生发电的基本单位相对应的规模，即几兆瓦来实现。