A Grey NGM(1,1,𝑘) Self-Memory Coupling Prediction Model for Energy Consumption Prediction

Table 5

MAPE of four different models for energy consumption.

Energy sources	GM model	GM + three-point model	NGM model	NGM + self-memory model
Total energy	4.95%	4.74%	4.42%	2.30%
Coal	5.13%	4.93%	4.66%	1.73%
Electricity	3.83%	3.78%	3.66%	1.54%