Power
It's said that the shorter the grass is on a golf course, the faster a golf ball will roll on it, and the farther it'll go. By trimming even an extra quarter-inch of the grass at your local course, you could wind up partly responsible for the first hole-in-one of an aspiring pro golfer.
Is that power? Not really.
Honestly, your tenure as a greenskeeper probably won't have any sort of powerful impact. The work is menial and the outcome is aesthetic. There's no room for creativity, and your job will be to follow the orders of the course owners and managers. We're not trying to be mean—that's just the way it is.
But hey, if you're out there in the sun keeping those greens like it ain't no thing, then it was probably never about power anyway.