At first glance, the Canadiens’ power play is, well, okay.

The Canadiens rank 11th in the National Hockey League with a success rate of 20.3 per cent, which is an improvement over last season, when they finished 28th at 14.3 per cent.

But there are numbers that suggest the Canadiens could do better.

Coach Michel Therrien started the season with Andrei Markov and Raphael Diaz on the points, while P.K. Subban was cooling his heels waiting for a new contract. After the first six games, the Canadiens ranked sixth in the NHL with a success rate of 27.1 per cent.

Markov and Diaz shared the team scoring lead with eight points each. Markov had a team-leading four goals and all his points were on the power play. Diaz earned six of his eight assists on the power play.

But the Canadiens’ fortunes have reversed since Subban replaced Diaz on the No. 1 power-play unit. Subban has scored twice on the power play and picked up two assists, but the power play had dropped to 2011-12 levels. In the seven games since Subban began loading up his booming shot, the Canadiens have scored five goals in 39 opportunities for a success rate of 13.9 per cent.