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ACCOUNTING POLICIES (Tables)
12 Months Ended
Dec. 31, 2021
Schedule of estimated useful lives

The group´s remaining items of property, plant and equipment (including any significant identifiable component) are depreciated by the straight-line method based on estimated useful lives, as detailed below:

Buildings:  50 years
Vehicles:  5 years
Furniture, fittings and communication equipment:  5 - 20 years
Computer equipment and software:  3 years
Tools:  10 years
Gas Plant and Pipeline:  20 years