You can start small by plugging your electronics and lights into power strips with an on / off switch and powering these down whenever you leave home. (mindbodygreen.com)
One nice feature was a universal power strip for electrical plugs from around the world, keeping you charged in case you forget your adapter. (dreamtravelonpoints.com)
Use smart power strips to reduce the flow of electricity to devices that are not being actively used. (rismedia.com)