Centered Moving Average
When we calculate seasonality, it is important to separate year trend and seasonality trend. That's why we need to calculate Centered Moving Average first.
Reference:
https://www.itl.nist.gov/div898/handbook/pmc/section4/pmc422.htm
https://www.statisticshowto.com/moving-average/
Linear Regression Analysis of Energy Consumption Data
For sub-country, such as in different parts in Australia or Russia, we use linear regression on weather conditions to get regional natural consumption.
Reference:
https://www.degreedays.net/regression-analysis#multiple-regression