Seems to be pretty genuine, for companies with a lot of equipment that will benefit it appears to produce good results. They have a case study listing Tesco and Woolworths who reduced consumption by quite a lot. Obviously "saving" power is not quite accurate since it will only be effective in certain ways.

However I am not convinced that the average house would make a massive saving - for instance the major useage of power in out house is probably washing, drying, cooking, televisions and computers. I don't think any of these would benefit. For lighting we use compact flourescent lamps for most rooms which are already very efficient, presumably the only effect would be a slight dimming, and if I wanted to save energy I would swap it with a lower powered version!

Gareth