Solar power inverter
There is a handy device that I can personally recommend called the power inverter. This device will accurately measure how much electricity each of your house hold devices are using.
To use it, you simply plug it into any standard wall outlet. You then plug your device into the outlet on the power inverter meter. The unit has an LCD display that will show you all the data you could possibly want.
I recommend using this device to measure the electrical needs of all of the devices in your home. Keep a list of how much power they consume.
You won't be able to use this device with some of your appliances. Appliances like water heaters, electric cook stoves, and dishwashers won't generally have a cord that you can plug into the device. They will likely be permanently wired into your homes electrical supply.
These devices will often have stickers affixed to them that states their electricity consumption.
Knowing how much electricity by using the Kill A Watt meter each of your electrical devices use can help you determine where you need to make cutbacks.
If you are serious about cutting your electricity consumption, I suggest that you purchase a power inverter today!