Relationship Between Electric Demand AndCDD And The Forecast Of Daily PeakElectric Load In Beijing

The CDD (Cooling Degree Days) are correlated to the electric demand with the coefficient of 0.56 (a=0.01) during Jun. to Sept., 1951–2004. It shows that the variation of CDD can reflect the trend of electric demand greatly. So the energy consumption will follow the increasing trend of CDD in summer in future. The relationship between daily CDD and the electric peak load (Jun.–Sept., 2002–2004) was analyzed by a multiple regression model. It shows that with a 1 degree day increasing of CDD, the daily peak electric load increases by 798, 1058, 1062 and 479 MW respectively in each month from Jun. to Sept. According to the next day’s CDD and the peak electric load of the day before, the next day’s peak electricity load could be forecasted by the multiple regression models in summer.