Hydrogen is often sold as the answer to long-duration energy storage. But for the power grid, it is usually the most expensive, least efficient option compared with batteries, pumped hydro, transmission, demand response, thermal storage, and strategic backup using existing infrastructure.
Grid storage is not one single challenge. It is several different challenges happening on different time scales. Hydrogen advocates often jump straight to rare worst-case events and pretend that is the whole story.
Need: frequency and voltage stability.
Best tools: batteries and power electronics.
Need: shift solar from midday to evening.
Best tools: lithium batteries, pumped hydro.
Need: manage weather variability.
Best tools: transmission, demand response, overbuild, flow batteries.
Need: strategic reserve.
Best tools: existing backup assets, thermal storage, load flexibility.
Each step adds cost, energy losses, infrastructure needs, and safety requirements. The result is a system that burns money to recover only a fraction of the original electricity.
Massive capital costs for electrolyzers, compression, storage caverns, pipelines, and reconversion equipment. Most of it would sit idle for long stretches and only run in rare emergencies.
Keep proven backup infrastructure available for rare events, cut overall demand with efficiency and thermal storage.
Hydrogen does have real uses in some industrial processes, including ammonia production and selected chemical applications. But that does not justify turning it into a bulk electricity storage system for the grid.
Industrial feedstock? Sometimes yes. Grid storage backbone? No.