Remember that we’re excluding otherįactors like the energy used during manufacture, longevity (MTBF),
I’ve made many assumptions here but the approach is valid. I can use this number to help me decide whether buying At 55 watts/hour the laptop consumes around 80.3 kWh perĪssuming 15 cents per kWh, that prices the desktop’s annual electricalīill at about $29.56 and the laptop’s at $12.05. At 135 watts/hour, the Dell desktop consumes roughly 197.1 We’ll again assume 4 hours of moderate use per day, or 1,460 hoursĪnnually. The MacBook clocks in at 55 to 58 watts for The Dell desktop and itsĭisplay together consume 104 to 162 watts during moderate use. Say I want to replace a Dell OptiPlex GX260 Pentium 4 and its 17″ĭell LCD display from 2003 with an Apple MacBook Pro withġ5″ integral display from 2010. Let’s use the formula to compare laptop to desktop energy costs. (Here are example power specs for the iPad and iPhone.) From least to greatest energy consumed, the device type hierarchy is:
If they meet your needs, consider moving to even more energy-stingy devices, Whether laptops last as long as desktops, how much energy goes into Only talking ongoing energy consumption here.
I’ll show you a formula below so you canĮasily determine the energy cost savings you get with a laptop. If you’re buying a computer andĮlectricity, go with a laptop. This chart lists power consumption for displays alone.Ī laptop in use always uses less electricity than a desktop in use. View this power consumption chart to see how much electricity some typical systems use. Both figures include typical LCD displays. Watts while in use, while laptops often burn between 15 and 60 watts. Voltmeter!) Most desktop computer systems consume between 70 and 200
It’s tough to generalize about computer powerĬonsumption because it varies so widely. We’ll discuss the Standby, Sleep, and Hibernate states below.Ģ. Your computer can be in different “power modes.” When you’re not using it, your computer drops into a low power mode.
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