Photoncycle says it can store solar energy from summer to winter cheaper than batteries

https://sifted.eu/articles/solar-energy-breakthrough-solid-hydrogen

"for heat and electricity in winter using solid hydrogen in a 3 cubic m copper cylinder with thick Styrofoam wrapping... more efficient storage than batteries or liquid hydrogen, doesn’t lose much energy in conversion... losses are mostly heat (captured), 70% house energy heating related... non-flammable... store electricity 20X more dense than a lithium battery does... produces hydrogen and electricity in same high-temperature fuel cell... goal of selling 10k units in Denmark in 2025, and to have them installed in 2027"