The BIGGEST problem with clean energy

1981, G. Harry Stine wrote "Space Power" about geosync solar power satellites.  40 years later, England is seriously considering building a 2GW solar power sat.  It's contingent on Starship to get the materials up there.  2GW is only ~ 1/40th of what England needs, but it's a start.  Still need batteries or (?) as the space-based solar panels are illuminated 99% of the time, so 1% of the time you need _something_ to hold the grid up.