A method for managing a computing center having a plurality of computing center resources (220 1 - 220 N) that are designed to deliver a plurality of computing services, comprising: receiving, by a management station from a first of said plurality of computing center resources (220 1 - 220 N), first energy savings information for a first physical layer device (112, 122, 211) of said first of said plurality of computing resources (220 1 - 220 N), said first energy savings information being generated by said first of said plurality of computing center resources (220 1 - 220 N) based upon use by said first physical layer device (112, 122, 211) of a first energy savings state in response to a first low traffic utilization condition detected by said first of said plurality of computing center resources (220 1 - 220 N); receiving, by said management station from a second of said plurality of computing center resources (220 1 - 220 N), second energy savings information for a second physical layer device (112, 122, 211) of said second of said plurality of computing center resources (220 1 - 220 N), said second energy savings information being generated by said second of said plurality of computing center resources (220 1 - 220 N) based upon use by said second physical layer device (112, 122, 211) of a second energy savings state in response to a second low traffic utilization condition detected by said second of said plurality of computing center resources (220 1 - 220 N); generating a collection of energy savings statistics indicative of network traffic provided by the plurality of computing center resources (220 1 - 220 N); determining a level of utilization of a computing service delivered by said computing center based on said first and second received energy savings information and based on said energy savings statistics; and switching off a computing center resource (220 1 - 220 N) used to deliver said computing service based on said determination. receiving, by a management station from a first of said plurality of computing center resources (220 1 - 220 N), first energy savings information for a first physical layer device (112, 122, 211) of said first of said plurality of computing resources (220 1 - 220 N), said first energy savings information being generated by said first of said plurality of computing center resources (220 1 - 220 N) based upon use by said first physical layer device (112, 122, 211) of a first energy savings state in response to a first low traffic utilization condition detected by said first of said plurality of computing center resources (220 1 - 220 N); receiving, by said management station from a second of said plurality of computing center resources (220 1 - 220 N), second energy savings information for a second physical layer device (112, 122, 211) of said second of said plurality of computing center resources (220 1 - 220 N), said second energy savings information being generated by said second of said plurality of computing center resources (220 1 - 220 N) based upon use by said second physical layer device (112, 122, 211) of a second energy savings state in response to a second low traffic utilization condition detected by said second of said plurality of computing center resources (220 1 - 220 N); generating a collection of energy savings statistics indicative of network traffic provided by the plurality of computing center resources (220 1 - 220 N); determining a level of utilization of a computing service delivered by said computing center based on said first and second received energy savings information and based on said energy savings statistics; and switching off a computing center resource (220 1 - 220 N) used to deliver said computing service based on said determination.