Electricity generation would be a massive waste - especially in nuclear-powered France. It is far more valuable as input for various industrial processes.

For example, the Haber-Bosch process requires hydrogen and nitrogen to produce ammonia, which is used as fertilizer. Traditionally the hydrogen is obtained from methane, but that emits a massive amount of CO2 - about 1% to 3% of all worldwide CO2 emissions. Feeding the process directly with hydrogen would be a gamechanger.