As we continue our transition to a fully mobile workforce, we encountered a significant side benefit to deploying laptops as our standard workstation: laptops save a ton of energy. At the moment, our standard deployment includes a Lenovo W530 and two Dell U2312 displays.
All together, this equipment draws, on average, 95 watts of power at idle. Under load, energy usage can go as high as 140 watts. Our outgoing standard consisted of full-sized Dell towers (of varying vintage) and similar dual monitors.
That configuration draws almost 260 watts of power at idle. Under load, the power consumption increases to over 310 watts.
|Machine||Power Consumption at Idle||Power Consumption Under Load||Annualized Power Consumption1||Annualized CO2 Emissions2|
|Lenovo W530||95.7 watts||140 watts||.7 MW hours||.461 metric tons|
|Dell Tower||257 watts||312 watts||1.7 MW hours||1.2 metric tons|
The difference is striking: even with the third screen the result is nearly a 60% decrease in average energy consumption with the new laptops. Of course, this admittedly unscientific analysis doesn’t account for every facet of energy used by these machines. There is embodied energy in the new machines, but we would be replacing the old computers anyway, so we’ve left that out of the comparison. Additionally, we’ve failed to account for the employees who diligently turn their machines off at night and those that run their machines at full load all day long. But overall, we feel that these numbers are at least representative of the potential savings associated with moving to lower-power, high-efficiency devices.