Re: Worrying signs
Pumped storage is ideal for renewable energy. When the wind blows you use the power from wind turbines to pump the water back up. That is why Scotland is enlarging our pumped storage and retroftting hydro systems with pumped storage to handle the increase in our wind capacity (provided enough power for 75% of domestic power recently). When wave and tidal comes on stream to augment wind there will be base level generating capacity there that will generate power even when the wind is not blowing. The tides are also very predictable. The Pentland Firth between the Scottish mainland and Orkney is having tidal turbines installed. The Atlantic flows into the North Sea there, massive amounts of water move regular as clockwork.
Scotland has LOTS of tidal races, large and small. Look at a sailing guide some time, it gives tidal speeds for every passage. Necessary if you are kayaking about, no point trying to kayak between two islands if the water is flowing faster than you can paddle. Time your trip so the tide is flowing the other way or haul out and have elevenses while you wait for the tide to change. Turbines in even a significant fraction of such places could generate serious amounts of reliable power.
Though we might leave the Gulf of Corryvreckan as it is ;-)