Interesting, but I think it's more habits than gadgets (though, they help!).
Take my appartment for exemple, it's an old building and the electric water heaters are all located in the basement and we are at the 3rd floor ... That means every time I want to use hot water, it has to travel a LONG way and lot of heat is lost, so I finally installed a timer to see if I could save money, turns out my eletric bills went down. (the timer opens around 3pm and closes at 10pm, since we are out all day, there is no need for it to be open)
Another power hungry machine is the dryer, turns out that putting the clothes out on a line as much as possible made us save more money.
In the end with all the tricks we are using, the electric bill went down by 50% ... That is significant!