Construction costs are currently skyrocketing

To produce 1 kWh of heating energy from H2 via electrolysis, you first have to put in much larger amounts of electricity. I vaguely remember a factor of 5. Even if the electricity were produced "green," according to that you would have to increase the number of wind turbines by a factor of 5 compared to today for the same amount of energy from H2. And that in a situation where we in Germany today hardly find any space for new additional wind turbines. Added to that would be the additional primary energy effort for the production of these additional ....

Well, H2 can basically be stored... electricity cannot. So should one then heat in the summer because the electricity is just so cheap? What do you do with electricity that is not in demand? And what about dark doldrums? Heat with electricity from gas or what?

You surely know (since you apparently know everything) that the kWh of electricity will not cost less in the future ;)

You realize that yourself, right, or do I have to? ;-)

Well, H2 can basically be stored... but electricity cannot. So should we heat in summer because electricity is so cheap right now? What do you do with electricity that is not demanded? And what about dark doldrums? Heat with electricity from gas or what?

Oh, we need H2. In incredibly large quantities. Just not for heating or cars. An entire chemical and steel industry must be converted. And that can largely only be done with H2. Dark doldrums were invented by the coal industry - with a correspondingly large grid, they do not exist. Even if we cut all cables to neighboring countries, we only need to bridge a maximum of two weeks in the country. That can be stored (heat, water, H2, methane, battery).

The coal industry invented dark doldrums – with a correspondingly large grid, they do not exist. Even if we cut off all cables to neighboring countries, we only have to bridge a maximum of two weeks within the country. That can be stored (heat, water, H2, methane, battery).

Two weeks are about 20 TWh of electricity. That is what is stored in the batteries of 300 million charged Teslas.. Without providing this power at every moment on time, there will be massive blackouts, leading to hundreds or even thousands of deaths.

The only realistic option is practically to entirely supplement the grid with gas power plants as backup.

See the study "Klimapfade 2.0" (google!)
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- 100 billion €/year are to be invested
- Another 140 GW photovoltaic, 98 GW wind (onshore),
- By 2045, almost 40 million electric cars are expected to be on the road
- New gas power plants with 43+ GW by 2030, which should later be able to run on hydrogen

Or, as I see it, import nuclear power from neighboring countries; Poland and France are already planning.

To produce H2, strategic and economic cooperations with desert countries could be established. Here, H2 could be produced relatively cheaply through photovoltaics.

To produce H2, strategic and economic cooperations with desert countries could be entered into. Here, H2 could be produced comparatively cheaply through photovoltaics.

a not entirely new idea: it was already pondered more than 25 years ago with the advent of photovoltaics, to do this on the northern edge of the otherwise "useless" Sahara. As far as I know, nothing ever came of it because the area was considered too politically/strategically insecure.