Pwr
Power tool — projected game power on the 20–80 scale.
What Pwr means
Raw power is what a hitter shows in batting practice; the graded tool is how much of it he is expected to get into games, which depends on his swing plane and approach.
What counts as a good Pwr
Higher is better — roughly 40 is poor, 50 average, 60 good, and 70 or better elite.
Also written
power_tool · power
Source
FanGraphs