Power opted to return to the University of Michigan for his sophomore season after being selected by the Sabres with the No. 1 pick in last summer's NHL Draft.
His decision was driven by Michigan's potential for a national championship. His freshman campaign - already atypical due to the COVID-19 pandemic - was cut short when a positive test forced the Wolverines to forfeit their opening game of the NCAA Tournament.
The championship run fell short when Michigan lost to Denver in the Frozen Four on Thursday. But Power made the most of his sophomore campaign, tallying 32 points (3+29) in 33 games.
His 0.97 points per game ranked third among NCAA defensemen.
"Owen's extremely self-aware of his game, what he does well, what he wants to work on," Sabres general manager Kevyn Adams said. "Whenever I go watch him play and I talk to him after a game, he immediately gives a breakdown of his games: 'I liked what I did here, I think I need to do better there.'
"It's impressive at a young age to see that. And I think part of his mindset of going back for this year was to grow and he's attacked the season. This player to me sums up the type of people we want on the Buffalo Sabres and in our locker room, people that get up every day and want to be better."