Furthermore, cost of storage is falling even faster than wind or solar ever did. Wait until next year, and you get lots more storage for your money.
Finally, batteries are good for very short-term storage -- their round-trip efficiency and fast response are unbeatable -- but they cost more than alternatives. For storage that you don't need to draw down every night, something you can fill cheap tanks with is better even if round-trip efficiency is low. Something you can also sell when your local tanks are full, and buy if they seem likely to go dry, is better yet.
So, expect to see a lot of anhydrous ammonia long-term storage. Also, hydrogen, and liquid nitrogen. And, lots of tropical sites synthesizing for export to higher latitudes in winter, and lots of higher-latitude cities importing it, via ship, in place of LNG and oil.
It is kind of surprising to see the batteries set up in Morocco, not in UK. That might be politics. Typically, storage is best sited near point-of-use. Maybe part of the deal is Morocco gets to use a share of the energy.
