Plug devices with standby power, such as TVs and stereos, into a power strip so you can turn them all off at once. (Some have timers to switch off at night.)
To further cut your electric bill, replace regular bulbs with compact fluorescents.
Potential savings: More than $300 over five years
NEXT: College - Contribute to a 529 plan early and often
Last updated June 13 2008: 10:48 AM ET