it greening computer power consumption study christian grieco time warner cable...
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IT Greening
Computer Power ConsumptionStudy
Christian GriecoTime Warner CableChristian.grieco@twcable.com
Purpose of Study
• Ascertain an estimate of expenditure on electricity to power staff computer infrastructure
• Determine $ savings potential in implementing various measures to improve efficiency without affecting productivity
DOE & EPA Computer Electricity Research
• $25 - $75 savings per computer per year• 39% of computers in businesses are left powered
on overnight and weekends• Study translates to savings of $13,750 - $41,250
yearly on DESKTOPS alone • Laptop savings not estimated as part of this study
Estimate of PC Inventory
550 Desktops
420 Laptops
750 Flat Screen monitors
? CRT monitors
• 550 Desktops
• 420 Laptops
• 750 Flat Screen monitors
• ? CRT monitors
Methodology• Use Kill A Watt device to measure actual
electricity consumption of desktop and laptop computer
• Measure usage• no power savings 24 hours• no power savings 8.5 hours• power savings 24 hours• power savings 8.5 hours
Business Class Laptop
Device Power Draw ( in watts)
Laptop 17
Monitor 26
Printer Standby
11
Printer Printing 530
Business Class Laptop
TimeframePower
Consumption
24 hours 1.40 kWh
8.5 hours .49 kWh
Non business hours
.91 kWh
Power off the machine to realize 65% savings
Even with no power saving features set
Business Class Desktop - NO Power Savings
TimeframePower
Consumption
24 hours 1.77 kWh
8.5 hours 1.00 kWh
Non business hours
.77 kWh
Power off the machine to realize 44% savings
Even with no power saving features set
Business Class Desktop With Power Savings Features
TimeframePower
ConsumedSavings usingPower Savings
Combined Savings
24 hours 1.04 kWh .73 kWh
8.5 hours .81 kWh .19 kWh .96 kWhNon
business hours
.23 kWh .54 kWh
Enable Power Savings & Power Off to realize 54 % Savings
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