Asking as an interested non-industry-member: where do you see very-large-scale short-term power storage going in the next few years? Oversimplifying: if we're

Asking as an interested non-industry-member: where do you see very-large-scale short-term power storage going in the next few years? Oversimplifying: if we're running at an average of (let's say) about half load (full load at peak, and 1/3 load at all other times, for about 4/9 ~= 45% average 24h load), wouldn't it be useful to run generating stations at or around that figure around the clock and store the off-peak surplus for on-peak use?