people in the octopus trial didn't actually save many kwhrs, but it all adds up
50% of participants reduced regular energy by 40% / 0.6Kwh in evening 4.30/6.30pm slots, ie. they regularly use 1.5, seems fairly easy on the occasional basis, with 24 hours notice,where you could move any kind of cooking intensive meal to the next day or cook later (w/o children) but, if you had to do that for a straight week might be more difficult.
because we can store it for winter when the wind doesn't blow, or sun doesn't shine ... albeit could have demand shifting electric from other time zones,
shell in the Netherlands and Norway are signed up for electrolysis at industrial scale.
Compressed hydrogen also can be stored in aquifers, salt caverns, or empty natural gas fields. This is proven technology for natural gas. The storage pressure currently varies between 100-150 bar and may exceed 250 bar for very deep reservoirs or aquifers. Hydrogen storage in salt caverns and depleted oil wells is also demonstrated for more than 30 years. Three caverns are currently licensed for operation on Teesside, each cavern is capable of storing 70,000 m³. Operated by SABIC, the facilities support hydrogen distribution to chemical plants in the Teesside chemical complexes and have done so for over 30 years. The caverns operate at 45 bar at a depth of 400 m with a total storage tonnage of 700-1000 tonnes (27,600- 39,429 MWh 3 ) and are adjacent to the BOC SMR