Power consumption of computers, servers, network gear, storage devices and related supporting HVAC and power supplies can add up to a significant portion of TCO. With the incresed awareness of the need to conserve natural resources and increased cost of electricity, it has become important to include these costs as part of a TCO assessment.

Power consumption is not part of the TCO tool; however, CoSN's Green Computing Leadership Initiative includes an Energy Usage Calculator that provides total and per-client-computer energy usage and cost estimates which can be added to your TCO assessment.

CoSN's Green Computing Leadership Initiative provides several white papers and other resources on user computing and datacenter power consumption.