Power load forecasting method

A power load forecasting method comprises the following steps: steps 1, trialing all annual load characteristic indexes and a plurality of influence factors and establishing quantitative relations between all the annual load characteristic indexes and the plurality of influence factors; historical data includes annual load characteristic index data of the past years and influence factor data; step 2, forecasting all the annual load characteristic indexes of the years to be forecasted through the quantitative relations obtained in step 1, and forecasting the annual energy output of the years to be forecasted according to the forecasted annual load characteristic indexes; step 3, distributing the forecasted annual energy output to every mouth. The annual energy output and the mouth energy output can be forecasted through the method, the plurality of influence factors are considered as a whole, the forecasting accuracy is high, and a reliable foundation is provided for planning of power utilization plans. An improved grey forecasting method is used for calculation, so that the efficiency is high.