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Computer Energy Conservation

A typical desktop PC with a 20” flat panel LCD monitor requires about 100 watts – 80 for the computer and 20 for the monitor. Left on 24/7 for one year, the system will consume 874 kWh of electricity. That’s enough to release 750 lbs. of carbon dioxide into the atmosphere – the equivalent of driving 820 miles in an average car.

To reduce power usage by as much as 75%, put your computer into a power saving mode when you won’t be using it for an extended period of time and enable power management features during shorter periods of inactivity.

As you can see from the chart below, the energy needed to power all computers on campus can really add up, but the total energy savings to the University can be significant if everyone will do their part to help cut energy usage.

Power Optimization for Campus Computers
Yearly Average 1580580 kWh
Optimized 388501 kWh

An Optimized computer is defined as being in use for 5 hours per day, on for 3 hours, and in standby for 16 hours.

Enabling Power Management

Sleep, Standby, or Hibernate?

Standby puts your computer into energy-saving mode, where it uses very little power.

Hibernate saves your workspace then turns the computer off.

Sleep means different things on different computers.

Greener Electronics

Where possible, our recommended standard models for computer, laptop or monitor purchase will be EPEAT-registered, with preference for products that have achieved Silver registration or higher. EPEAT-registered products offer reductions in environmental impact across their lifecycles—from fewer toxins in manufacturing to efficient operation and easier recycling.