It’s still not earning you money to spend electricity because you still have to pay the transfer fee which is around 6 cents / kWh but it’s pretty damn cheap nevertheless, mostly because of the excess in wind energy.
Last winter because of a mistake it dropped down to negative 50 cents / kWh for few hours, averaging negative 20 cents for the entire day. People were literally earning money by spending electricity. Some were running electric heaters outside in the middle of the winter.
Storing solar and wind isnt cheap enough. The battery costs are outrageous, not to mention the thing you dont want: the materials Arent easy renewable. Nuclear can generate 30% of you base powerload while the rest is powered by solar and wind (that way you dont need coal of gas).
Storing electricity from wind/solar with hydrogen isnt efficiënt and would drive up energy prices just like with batteries