The Power is a very difficult play to defend. Luckily, most teams run the play so as a defensive coordinator you can spend time each practice working the different techniques required to stop it.
The Power Play is one of the most universal running schemes in football. In order to defend it properly the defense must have all players on their game and completing their jobs. With that said, there are three players who must do their job in order for the defense to have any success. Regardless of the defense these are the players who are taking on the double team, the kickout block and the linebacker on the side of the play.
The first, and some would argue most important, person when defending the power is the defensive lineman who is being double team.