A special forecasting model-referred to as an econometric model-was developed by CG&G to better account for the behavior of these time series. Their econometric model forecasts the annual energy consumption by residential, commercial, and industrial classes of service. These initial forecasts are then used to develop predictions of summer and peak winter loads. A number of economic and demographic time series are used in the construction of this model. Simply speaking, entire forecasting system is a compilation of several, statistically verified multiple regression equations.