Add sample_index
Add start_energy_col
Add list_of_hours
Use list_of_hours
Add elem
Add list_of_quarters
Use list_of_quarters
Add start_energy_col
Use start_energy_col
Add sample_index
Add sample_index
Rebuild fetch_energy_field using sample_index
Remove self.column_index, self.col_in_sheet
Remove start_col
Remove start_col
Remove start_col
Move period_server
Move period_server
Add period_server
Move period_server