At a time their playoff chances showed signs of dimming, Buffalo provided a tenacious response in a 26-7 win over the Pittsburgh Steelers. It was an outing that wasn’t so much perfect, but ultimately essential in reminding the NFL — and themselves, perhaps — that the five-time defending AFC East champions aren’t going away easy.

The investigation will examine ways to contain energy costs and evaluate whether certain charges should be eliminated, consolidated, or redesigned as a fixed charge, officials said.