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Tip: Some equipment continues to pull a small amount of power even when turned off. Put as much equipment as you can on a power strip, and turn it off at the end of the day. Some surge protectors have certain outlets that are designated as always on, which allow you to keep power flowing to some devices even after turning off the power strip.

Tip: If you haven't done so already, upgrade from a CRT to an Energy Star-certified LCD monitor to save £5 to £15 per year in electricity costs. Note that there are wide variations even among Energy Star monitors, as the PG&E spreadsheet shows.

Tip: Some equipment continues to pull a small amount of power even when turned off. Put as much equipment as you can on a power strip, and turn it off at the end of the day. Some surge protectors have certain outlets that are designated as always on, which allow you to keep power flowing to some devices even after turning off the power strip.

Tip: Enabling power management on your desktop or laptop can save from £7 to £22 per year in power consumption. Start timeouts at 15 minutes for the display and disk spin-down, 30 minutes for standby and 45 minutes for hibernate mode. Then try more aggressive settings for the display and disk. Energy efficiency consulting firm Rocky Mountain Institute recommends trying to get down to 2 to 3 minutes for each.

Tip: Replace your separate broadband modem and router with a single, integrated gateway device.