21. Provision for asset retirement obligation – fuel tanks

The provision corresponds to the legal obligation to remove the subsidiary IPP’s underground fuel tanks located at by Ipiranga-branded service stations after a certain use period (see Note 2.n).

Changes in the provision for asset retirement obligation are as follows:

Balance as of December 31, 2017	64,774
Additions (new tanks)	264
Expenditure with tanks removed	(12,752	)
Accretion expense	2,381
Balance as of December 31, 2018	54,667
Additions (new tanks)	290
Expenditure with tanks removed	(5,456	)
Accretion expense	1,741
Balance as of December 31, 2019	51,242
Additions (new tanks)	163
Expenditure with tanks removed	(4,306	)
Accretion expense	6,336
Balance as of December 31, 2020	53,435
Current	4,267
Non-current	49,168