H2 is not really a good choice for energy storage. Its not a very good fuel and it is hard to prevent leaks/loses

Rick Manner Hello Rick, I think that's a different discussion. The world seems to have decided otherwise. I also have different opinion on that issue.

But that's not the question here. Every study I know uses H2 as long term energy storage.

What I'm wondering now, is why people mention hydrogen turbines when talking about power-to-hydrogen-to-power and not fuel cells?

Is it because there are lower requirements on the hydrogen quality or because it is possible to burn the hydrogen at higher temperatures and use the exhaust heat at a higher energy level?

Dennis Hager It might be a reasonable simplifying assumption for a study but if they ever move beyond the study phase and try to actually build something it is very likely that they will make a better choice

In my opinion, hydrogen combustion offers three advantages:

- lower hydrogen quality required (epecially important if the H2 is stored in underground salt caverns or similar storage facilities)

- lower investment costs and demand for rare or expensive materials

- higher rated power available

However, I have not found any appropriate publications to support my opinion yet. I would be very interested in a paper or study regarding this questions as well!

Electrochemical hydrogen storage, in my opinion, is the safest form of storage. Power generation using hydrogen as a fuel through fuel cells is quite efficient than hydrogen combustion as the flame propagation in H2 combustion is uncontrolled. Fuel Cells, like PEMFC, operates at NTP (normal temperature pressure) conditions with ZERO emission.