Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2023

Schedule of property, plant and equipment

(€ million)	Land and buildings		E&P wells, plant and machinery		Other plant and machinery		E&P exploration assets and appraisal		E&P tangible assets in progress		Other tangible assets in progress and advances		Total
2023
Net carrying amount - beginning of the year	1,088		40,492		4,280		1,345		7,494		1,633		56,332
Additions	22				407		764		6,294		1,252		8,739
Depreciation capitalized							20		184		1		205
Depreciation ^(*)	(47	)	(5,699	)	(610	)							(6,356	)
Impairments	(30	)	(1,164	)	(366	)			(226	)	(390	)	(2,176	)
Reversals			109		42				257		36		444
Write-off					(2	)	(420	)	(25	)			(447	)
Currency translation differences	1		(1,223	)	(39	)	(46	)	(268	)	(3	)	(1,578	)
Initial recognition and changes in estimates	3		698		16		17		14				748
Changes in the scope of consolidation - included entities	48		521		298				131		77		1,075
Changes in the scope of consolidation - excluded entities					(1	)							(1	)
Transfers	37		5,592		595		(70	)	(5,522	)	(632	)
Other changes	(11	)	(1,905	)	(32	)	(42	)	1,349		(45	)	(686	)
Net carrying amount - end of the year	1,111		37,421		4,588		1,568		9,682		1,929		56,299
Gross carrying amount - end of the year	4,354		139,866		32,121		1,568		13,670		4,308		195,887
Provisions for depreciation and impairments	3,243		102,445		27,533				3,988		2,379		139,588
2022
Net carrying amount - beginning of the year	1,071		42,342		3,850		1,244		6,497		1,295		56,299
Additions	22		132		456		655		5,361		1,074		7,700
Depreciation capitalized							11		179				190
Depreciation ^(*)	(51	)	(5,466	)	(555	)							(6,072	)
Impairments	(21	)	(313	)	(485	)			(149	)	(414	)	(1,382	)
Reversals	3		40		191				141		38		413
Write-off	(1	)			(2	)	(365	)	(218	)			(586	)
Currency translation differences	2		2,422		55		74		368		5		2,926
Initial recognition and changes in estimates			(173	)	2		(7	)	98				(80	)
Changes in the scope of consolidation - included entities	9		650		695						118		1,472
Changes in the scope of consolidation - excluded entities	(1	)	(3,687	)	(6	)	(119	)	(546	)			(4,359	)
Transfers	41		4,402		426		(149	)	(4,253	)	(467	)
Other changes	14		143		(347	)	1		16		(16	)	(189	)
Net carrying amount - end of the year	1,088		40,492		4,280		1,345		7,494		1,633		56,332
Gross carrying amount - end of the year	4,255		143,432		31,328		1,345		11,654		3,798		195,812
Provisions for depreciation and impairments	3,167		102,940		27,048				4,160		2,165		139,480

(*) Before capitalization of depreciation of tangible assets

Schedule of depreciation rates

(%)
Buildings	2 - 10
Refining and chemical plants	3 - 17
Gas pipelines and compression stations	4 - 12
Power plants	3 - 5
Other plant and machinery	6 - 12
Industrial and commercial equipment	5 - 25
Other assets	10 - 20

Schedule of stratification of the suspended wells pending final determination of proved reserves aging

(€ million)	2023		2022		2021
Costs for exploratory wells suspended - beginning of the year	1,085		1,101		1,268
Increases for which is ongoing the determination of proved reserves	834		547		288
Amounts previously capitalized and expensed in the year	(388	)	(374	)	(286	)
Reclassification to successful exploratory wells following the estimation of proved reserves	(72	)	(147	)	(43	)
Disposals	(3	)	(2	)	(3	)
Changes in the scope of consolidation			(114	)	(199	)
Currency translation differences	(40	)	65		100
Other changes	(25	)	9		(24	)
Costs for exploratory wells suspended - end of the year	1,391		1,085		1,101

The following information relates to the stratification of the suspended wells pending final determination (ageing):

	2023		2022		2021
	(€ million)	(number of wells in Eni’s interest)	(€ million)	(number of wells in Eni’s interest)	(€ million)	(number of wells in Eni’s interest)
Costs capitalized and suspended for exploratory well activity
- within 1 year	417	7.9	216	5.0	175	4.0
- between 1 and 3 years	347	6.1	246	4.9	269	12.2
- beyond 3 years	627	14.5	623	13.9	657	19.7
	1,391	28.5	1,085	23.8	1,101	35.9
Costs capitalized for suspended wells
- fields including wells drilled over the last 12 months	417	7.9	204	4.5	175	4.0
- fields for which the delineation campaign is in progress	804	14.0	579	11.3	567	17.9
- fields including commercial discoveries that are progressing to a FID	170	6.6	302	8.0	359	14.0
	1,391	28.5	1,085	23.8	1,101	35.9

Schedule of unproved mineral interests

(€ million)	Congo		Nigeria		Turkmenistan		USA		Algeria		Egypt		United Arab Emirates		Italy	Indonesia		Total
2023
Carrying amount - beginning of the year	198		958		95		16		211		3		520		2			2,003
Additions									61							92		153
Net (impairments) reversals	243				(93	)	8											158
Reclassification to Proved Mineral Interest			(1	)					(51	)	(1	)	(28	)				(81	)
Currency translation differences and other changes	(12	)	(33	)	(2	)	(1	)	(6	)			(17	)		(3	)	(74	)
Carrying amount - end of the year	429		924				23		215		2		475		2	89		2,159
2022
Carrying amount - beginning of the year	218		892		3		68		114		16		508					1,819
Additions			11						110		(2	)			2			121
Net (impairments) reversals	(28	)			93		(56	)										9
Reclassification to Proved Mineral Interest	(6	)							(19	)	(12	)	(19	)				(56	)
Currency translation differences and other changes	14		55		(1	)	4		6		1		31					110
Carrying amount - end of the year	198		958		95		16		211		3		520		2			2,003