The Most Energy-Efficient Appliances Lists are based on product directories and manufacturer's data and only includes models that are widely distributed in the United States.
Good basic overview of CHP and statistics. This is a brief of the full paper, but some good basic information on congeneration with diagrams and charts.
Sponsors an international conference on energy efficiency in buildings. Publishes reports on technical and policy issues relating to energy efficiency.
American Council for an Energy-Efficient Economy, ACEEE, works to promote a balanced energy policy for United States with energy efficiency as a cornerstone, and energy supply policies designed to serve the resulting reduced demand.