Energy efficiency index (ODEX) in industry by country
The 10 branches considered in the calculation are: chemical, steel, non ferrous, cement, other non metallic, paper, food, machinery, transport equipment and textile.
For steel, cement and paper, energy savings are calculated using specific consumption per tonne produced; for the other branches, the indicator used is the ratio on energy consumption related to production index.
ODEX is equivalent to the ratio between the actual energy consumption of the sector in year t and a fictive consumption without energy savings in the 10 branches;
These energy savings are measured from the sum of the energy savings in the 10 branches; for each branch, the energy savings is calculated from the reduction in the specific energy consumption
The variation of the weighted index of the unit consumption between t-1 and t is defined as follows: see formula.
The value at year t can be derived from the value at the previous year by reversing the calculation: It /It -1= 1/( It -1/It),
ODEX is set at 100 for a reference year and successive values are then derived for each year t by the value of ODEX at year t-1 multiplied by It /It -1.