What is the difference (for you) between an Energy Line and a Checking Line?
A checking line is usually a line that is filled with vets that understand the defensive aspects of the game in and out. They are the mainstays of the PK as well. Their main objective is to keep pucks out of their own net.
An energy line is a kamikaze type line that throws hits to change the momentum of a hockey game. To usually bring the team and the crowd alive. These players are usually younger type players.