Conwy RSPB had this mysterious notice on the back of their coffee shop. I have had a poke around the Internet to find out what it is about, although you can read what they say on their notice. I will look into it in more detail but opinion seems to be that the biggest advantage comes in terms of inductive load. That is the realisation that it isn't just resistance that causes problems in AC circuits. Equipment with electromagnetic coils in like motors will generate back emf by having a magnetic flux turning on and off repeatedly within the coils. If this effect can be reduced then energy can be saved.
