Peter DeBoer’s staff for his first full season with the Islanders will have another new name.

Ray Bennett, the longtime NHL assistant who spent last season running their woeful power play, won’t return for the 2026-27 campaign, the team announced, and the Capitals subsequently announced that he’d joined their staff as an assistant.

The decision for Bennett to leave the Islanders was mutual, according to The Post’s Ethan Sears, and it marked the second change since the Islanders’ season ended outside of the playoffs — with AHL head coach Rocky Thompson also getting promoted to the NHL staff earlier this month after one year running Bridgeport.

“The organization would like to thank Ray for his hard work and dedication to the organization last season,” the Islanders said in a statement.

Bennett, who also spent time as an assistant with the Blues and Kings, arrived last year as an addition to Patrick Roy’s staff after a stint with the Avalanche running their power play, but the Islanders’ unit kept struggling and finished with the third-worst unit in the NHL during the regular season at 16.5 percent.

Over the final 12 games of the regular season, with the Islanders clinging to their playoff hopes, they converted just five of their 34-man advantage opportunities, and that percentage worsened to just 2-for-18 across their final six games.

That, somehow, marked an improvement from their 12.5 percent rate from 2024-25.

Matthew Schaefer, who won the Calder Trophy as the league’s rookie of the year, led the Islanders with eight power-play goals while Bo Horvat added seven, but no one else collected more than five. 

It’ll serve as a primary issue for DeBoer, who coached the final four games after Patrick Roy’s firing, and his staff to solve entering next season, and now, with Bennett not returning, someone else will be tasked with running it, too. 

The Post’s Ethan Sears contributed reporting.