We’ve had numerous reports of Scotland’s wind-farms producing more than 100% of the country’s demand and, twice recently, doing so for whole months. See, for example:
Storage for the periods in between when production dips below 100% remains a problem. Converting the surplus electricity into hydrogen is already on the way to offering a partial solution. See these recent reports:
However, a recent breakthrough in battery developments looks like producing one capable of storing 100Mw.
Tesla has just finished installing a 100Mw lithium-ion battery in South Australia which will be tested for connection to the grid. The initial power will come from an adjacent wind-farm.
No doubt they will be expensive but as production increases and competitors enter the market, prices will fall. Put this together with the higher daily reliability of tidal and offshore wind power off Scotland’s stormy coasts with a mixed economy including solar power and Scotland’s future energy supply look more than secure. More likely, the ‘Saudi of renewable power’ becomes a reality.