Generation might be a slight misnomer, but it's conceptually the same as pumped storage - grid capacity that can be called upon as necessary.

I think you're right. I think its more like you say - grid capacity that can be called upon as necessary. Which is often from generators but not necessarily.

The "interconnectors" are more evidence this isn't really about generators, but grid entry points. The interconnectors are connections to the French, Danish, etc. grids.