Interesting. I did some back of the envelope calculations. A 100% efficient electrolyser requires 39 kWh of electricity to produce 1 kg of hydrogen. Best pract

Interesting. I did some back of the envelope calculations. A 100% efficient electrolyser requires 39 kWh of electricity to produce 1 kg of hydrogen. Best practical ones need about 50 kWh [1]. Hinderburg had about 18 metric tons of hydrogen [2], filling it would require about 1 GWh of energy. The good thing is - it could be used as a way to balance the electric network because we don't particularly care when we fill it as long as it's done. So we can do it when there's overproduction only. The energy would be quite cheap - in some cases you can get paid for using energy when electrical network needs balancing. Same thing is done with other energy-intensive industrial processes like smelting. In Germany (not particularly sunny but a lot of solar panels so effects of scale are there) the low bounds for price of 1 MWh of solar energy in 2018 was about 37 euro [3], let's round that up to 50 - filling Hindenburg would require about 50 000 euro of renewable energy. Additionally it would require about 9 * 18 ~= 162 tons of water and some additives to make it conductive. Maybe sea water could be used as is? [1] http://www.renewableenergyfocus.com/view/3157/hydrogen-production-from-renewables/ http://www.renewableenergyfocus.com/view/3157/hydrogen-produ... [2] https://www.history.com/news/the-hindenburg-disaster-9-surprising-facts https://www.history.com/news/the-hindenburg-disaster-9-surpr... [3] https://en.wikipedia.org/wiki/Cost_of_electricity_by_source#Germany https://en.wikipedia.org/wiki/Cost_of_electricity_by_source#...