In this paper, after integrating the original data with different selections, feasibility testing, and selecting the best scheme for different forecasting segments, a parameter optimized GM(1,1) is proposed for forecasting electricity consumption. At first, the original electricity consumption series were used to construct different schemes from the short- and long-term aspects. The electricity demand data at a given hour on different days varies similarly; thus, we used data from the same hour on different weeks. Second, through selecting the appropriate original data, an abnormality analysis and feasibility test can be used to improve the forecast
accuracy. Third, optimization algorithms were applied to select the best parameter