[Ekaros]

Cost competition is biggest aspect in my mind. Is the storage competitive compared to alternative if power is free is good benchmark in my mind to start with.

And what are political and ecological implications of them. As I doubt even the Greens prepared to build up most effective pumped hydro locations anymore. Effectively flooding quite large areas. And also I take there is questions where to get the water from in parts of the world...

[kitkat_new]

Cost must include environmental costs such as direct destruction of the environment and greenhouse gas emissions.

Competition on the basis of today's market prices which don't include this, is nonsense.