Lake Powell, the 2nd largest reservoir in the US, is at 22% capacity. ~8 points away from Glen Canyon Dam going dark.
(lemmy.today)
I think it's short for percentage points in this case. 22% minus 8 percentage points is 14%, which I assume was the fill level of some other dam which was decommissioned.
Pretty confusing phrasing, took me a minute to work out.