When Scotland, where I was brought up, announces it's national icon - whiskey - is going green you know substantial change must be underway. Using co-generation Speyside will convert waste left over from the whiskey process into heat and power.
Using the heat, as well as generating electricity, means that far less energy is wasted. Localised schemes like this also save a substantial amount of power by avoiding transmission line losses.
Similar systems can be used for residential homes as well. There's a small demonstration in Sydney and Alan Jones has led the way for UK's Borough of Woking, near London.