CoGeneration

use of power plant to generate both heat and electricity - aka CHP

typically used locally by a building/neighborhood, to complement/replace energy provided by the Energy Industry (Electric Utility)

in some cases the local group can actually sell electricity back to the utility during times when it has excess - a small player in the World Energy Grid

small-scale variety (MicroGrid): <http://en.wikipedia.org/wiki/Micro C H P>