I think your power saving calculations have missed a component and that is that the values do not include devices being accidentally left on. There are 3 states for most devices On, Standby and Off. Most people advise that they regularly forget to switch off devices a portion of the time or even leave devices on all the time. So any power saving calculation needs to take this into account.

The general consensus is that TrickleSaver type devices typically save around US$35 year in power – for typical TV and / or PC set-ups, sometimes considerably more, sometime less. The dangerous word here is “typical” – because there are so many different possible configurations – some people will have different / more devices, different usage patterns and different electricity rates and these will significantly alter / distort savings data. For example:
1. the cost of power in Hawai is nearly double that of many states.
2. a PS3 left on will cost approximately US$160 year to power

In order to provide better insight into potential savings we provide an on-line calculator: see http://www.calculator.tricklestar.com

You can build your own configuration, enter usage, purchase price, cost of power etc – so you can get a more accurate summary. All data is sourced from independent sources and for devices such as laser printers, scanners, TV’s uses industry averages as provided by DEFRA and AMEE.

Hope this is some use to your readers.

Best regards,

Bernard