The Energy Information Administration (EIA) produces forecasts of energy supply and demand for the next 20 years using the National Energy Modeling System (NEMS)[1]. These forecasts are updated annually and published in the Annual Energy Outlook (AEO). EIA published a preliminary version of the AEO 2009 in December 2008, and updated the forecasts in April, 2009, to incorporate the energy provisions in the stimulus.[2] All sectors of the energy system are represented in NEMS, including the electric power generation, transmission, and distribution system.