Pumped hydro is the only way, really. Coire glas, snowy 2, fengning, etc.

The problem isnt so much the scale or cost, just the amount of time it takes to commission and build them. You can deploy a solar farm in months, but pumped storage is like building a dam. It takes several years.

There also isnt a lot of point to storage unless you turn the gas off sometimes and I think we basically never do even at the sunniest and windiest. Not yet.

We should have been preparing for this for years rather than letting Putin pull the rug out from under our feet.