Relevance and costs of large scale underground hydrogen storage in France

The mobility market is clearly the key driver, both in quantity and economic terms, with an easier to achieve target cost (€4/kgH2, ex-storage). High utilization rates of electrolysers are necessary to reach profitability. A need for massive storage begins for a renewable penetration rate of 50%. The hydrogen costs varies from €4.5/kg to €6.6/kg H2, and the underground mass storage cost remains always under 5% of the overall costs.