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Energy efficiency improvement (ODEX) in EU-27 countries

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Energy efficiency index of industry (ODEX) is a weighted average of the specific consumption index of 10 manufacturing branches; the weight being the share of each branch in the sum of the energy consumption of these branches in year t and the sum of the implied energy consumption from each underlying industrial branches in year t (based on the unit consumption of the sub-sector with a moving reference year).

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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:

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.

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