Mega Tsunami
Emperor
Well, at the height of the Brexit brouhaha, Macron did threaten to cut off the power link between France and Britain. 
After we laid the first telegraph cable across the English Channel in about 1850 they said we will never get a cable across the Atlantic. It just won’t work – too far, too deep etc etc. Much like you here.
Well they did manage it of course… eventually. The first ones failed but new tech made it possible in the end.
When there is a great need for something, as there is now, the scent of profit at the end of it often leads to great innovations.
With the cable working fine between Norway and Britain it would be a huge disappointment if they didn’t, at least, try longer and longer undersea connections.
Maybe you are right but it is still well worth a try.

These are a band of fraudsters in London seeking to steal some financing. There's no way that cable can work technically. Too long. It's hard enough to run power across the Mediterranean.
The longest power cable deployed, currently not in regular use yet, crosses the shallow North Sea and is much shorter. Flawed, also. This proposed cable would go through deep seas, as I know those coasts very well - there's not chance it could hug the coast from the UK all the way to Africa, none. That project is a fraud.
Any connection between North Africa and Europe cannot circumvent geography, nor physics. Losses are going to be high and the path must be through land wherever possible to make maintenance feasible. Northern Europe will not have cheap(er) solar energy from Africa unless they invent some now-magical energy transmission technology.
After we laid the first telegraph cable across the English Channel in about 1850 they said we will never get a cable across the Atlantic. It just won’t work – too far, too deep etc etc. Much like you here.
Well they did manage it of course… eventually. The first ones failed but new tech made it possible in the end.
When there is a great need for something, as there is now, the scent of profit at the end of it often leads to great innovations.
With the cable working fine between Norway and Britain it would be a huge disappointment if they didn’t, at least, try longer and longer undersea connections.
Maybe you are right but it is still well worth a try.