I work at a large residential site (imagine a hospital, but that's not quite it), and our maintenance guy has been to a conference where he saw a product which apparently down-converts incoming 240v supply to the site to 220v. On the basis that most equipment these days can operate at 220-240 anyway, we are being told that that is fine to do. They are selling the "device" that does this as a means of saving energy / money.
Can this possibly work?
I'm no engineer, but I'd have thought that for examply boiling a kettle would draw the same amount of power whether it is fed 220 or 240v, its just that the current that would be drawn would be higher in the 220v scenario. Similarly for any device that uses "power" at a specific rate, reducing the voltage would just increase the current draw.
I can see perhaps how normal incadescent light bulbs might not use as much power, but they would simply burn slightly less brightly, wouldn't they?
Does the device and its claims sound credible?