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Property, plant and equipment (Tables) | 12 Months Ended
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Dec. 31, 2020
Property, plant and equipment |
Schedule of property, plant and equipment |
|  |  |  |  |  |  |  |  |  |  |  | Other tangible |  |
|  |  |  | E&P wells, |  |  |  | E&P exploration |  | E&P tangible |  | assets in |  |
|  | Land and |  | plant and |  | Other plant |  | assets and |  | assets in |  | progress and |  |
(€ million) |  | buildings |  | machinery |  | and machinery |  | appraisal |  | progress |  | advances |  | Total
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying amount - beginning of the year |  | 1,218 |  | 46,492 |  | 3,632 |  | 1,563 |  | 7,412 |  | 1,875 |  | 62,192
Additions |  | 12 |  | 6 |  | 229 |  | 265 |  | 3,127 |  | 768 |  | 4,407
Depreciation capitalized |  |  |  |  |  |  |  | 4 |  | 100 |  |  |  | 104
Depreciation (*) |  | (55) |  | (5,642) |  | (508) |  |  |  |  |  |  |  | (6,205)
Reversals |  | 13 |  | 183 |  | 342 |  |  |  | 98 |  | 12 |  | 648
Impairment |  | (82) |  | (1,551) |  | (972) |  |  |  | (567) |  | (582) |  | (3,754)
Write-off |  |  |  |  |  | (1) |  | (296) |  | (7) |  | (1) |  | (305)
Currency translation differences |  | (2) |  | (3,325) |  | (75) |  | (119) |  | (605) |  | (14) |  | (4,140)
Initial recognition and changes in estimates |  |  |  | 870 |  |  |  | (9) |  | 94 |  |  |  | 955
Transfers |  | 39 |  | 2,677 |  | 755 |  | (47) |  | (2,630) |  | (794) |  |
Other changes |  | (15) |  | (62) |  | (103) |  | (20) |  | 96 |  | 145 |  | 41
Net carrying amount - end of the year |  | 1,128 |  | 39,648 |  | 3,299 |  | 1,341 |  | 7,118 |  | 1,409 |  | 53,943
Gross carrying amount - end of the year |  | 4,082 |  | 136,468 |  | 28,839 |  | 1,341 |  | 11,169 |  | 2,742 |  | 184,641
Provisions for depreciation and impairments |  | 2,954 |  | 96,820 |  | 25,540 |  |  |  | 4,051 |  | 1,333 |  | 130,698
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying amount - beginning of the year |  | 1,274 |  | 42,856 |  | 3,901 |  | 1,267 |  | 9,195 |  | 1,809 |  | 60,302
Additions |  | 12 |  | 144 |  | 223 |  | 508 |  | 6,170 |  | 992 |  | 8,049
Depreciation capitalized |  |  |  |  |  |  |  | 14 |  | 202 |  |  |  | 216
Depreciation (*) |  | (60) |  | (6,435) |  | (537) |  |  |  |  |  |  |  | (7,032)
Reversals |  | 44 |  | 65 |  | 69 |  |  |  | 65 |  | 139 |  | 382
Impairment |  | (47) |  | (659) |  | (500) |  |  |  | (669) |  | (537) |  | (2,412)
Write-off |  |  |  |  |  | (5) |  | (216) |  | (49) |  |  |  | (270)
Disposals |  | (1) |  | (3) |  | (1) |  | (22) |  | (80) |  | (6) |  | (113)
Currency translation differences |  | 2 |  | 815 |  | 21 |  | 24 |  | 181 |  | 1 |  | 1,044
Initial recognition and changes in estimates |  |  |  | 2,028 |  |  |  | 25 |  | 21 |  |  |  | 2,074
Transfers |  | 42 |  | 7,568 |  | 597 |  | (42) |  | (7,526) |  | (639) |  |
Other changes |  | (48) |  | 113 |  | (136) |  | 5 |  | (98) |  | 116 |  | (48)
Net carrying amount - end of the year |  | 1,218 |  | 46,492 |  | 3,632 |  | 1,563 |  | 7,412 |  | 1,875 |  | 62,192
Gross carrying amount - end of the year |  | 4,067 |  | 144,789 |  | 28,191 |  | 1,563 |  | 11,406 |  | 2,799 |  | 192,815
Provisions for depreciation and impairments |  | 2,849 |  | 98,297 |  | 24,559 |  |  |  | 3,994 |  | 924 |  | 130,623
Schedule of depreciation rates | The main depreciation rates used were substantially unchanged from the previous year and ranged as follows:
(%) |  |
Buildings |  | 2 – 10
Mineral exploration wells and plants |  | UOP
Refining and chemical plants |  | 3 – 17
Gas pipelines and compression stations |  | 4 – 12
Power plants |  | 4 – 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) |  | 2020 |  | 2019 |  | 2018
Costs for exploratory wells suspended - beginning of the year |  | 1,246 |  | 1,101 |  | 1,263
Increases for which is ongoing the determination of proved reserves |  | 408 |  | 368 |  | 235
Amounts previously capitalized and expensed in the year |  | (226) |  | (183) |  | (61)
Reclassification to successful exploratory wells following the estimation of proved reserves |  | (48) |  | (46) |  | (297)
Disposals |  |  |  | (15) |  | (6)
Changes in the scope of consolidation |  |  |  |  |  | (58)
Reclassification to assets held for sale |  |  |  |  |  | (24)
Currency translation differences |  | (112) |  | 21 |  | 49
Costs for exploratory wells suspended - end of the year |  | 1,268 |  | 1,246 |  | 1,101
The following information relates to the stratification of the suspended wells pending final determination (ageing):
|  | 2020 |  | 2019 |  | 2018
|  |  |  | (number of |  |  |  | (number of |  |  |  | (number of
|  |  |  | wells in Eni’s |  |  |  | wells in Eni’s |  |  |  | wells in Eni’s
|  | (€ million) |  | interest) |  | (€ million) |  | interest) |  | (€ million) |  | interest)
Costs capitalized and suspended for exploratory well activity |  |  |  |  |  |  |  |  |  |  |  |
- within 1 year |  | 157 |  | 6.7 |  | 185 |  | 7.7 |  | 111 |  | 7.0
- between 1 and 3 years |  | 250 |  | 11.0 |  | 171 |  | 6.4 |  | 87 |  | 2.9
- beyond 3 years |  | 861 |  | 19.3 |  | 890 |  | 26.4 |  | 903 |  | 24.2
|  | 1,268 |  | 37.0 |  | 1,246 |  | 40.5 |  | 1,101 |  | 34.1
Costs capitalized for suspended wells |  |  |  |  |  |  |  |  |  |  |  |
- fields including wells drilled over the last 12 months |  | 157 |  | 6.7 |  | 185 |  | 7.7 |  | 111 |  | 7.0
- fields for which the delineation campaign is in progress |  | 631 |  | 14.9 |  | 556 |  | 11.3 |  | 217 |  | 4.7
- fields including commercial discoveries that proceeds to sanctioning |  | 480 |  | 15.4 |  | 505 |  | 21.5 |  | 773 |  | 22.4
|  | 1,268 |  | 37.0 |  | 1,246 |  | 40.5 |  | 1,101 |  | 34.1
Schedule of unproved mineral interests | Unproved mineral interests, comprised in assets in progress of the Exploration & Production segment, include the purchase price allocated to unproved reserves following business combinations or acquisition of individual properties. Unproved mineral interests were as follows:
|  |  |  |  |  |  |  |  |  |  |  |  |  | United Arab |  |
(€ million) |  | Congo |  | Nigeria |  | Turkmenistan |  | USA |  | Algeria |  | Egypt |  | Emirates |  | Total
2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Book amount at the beginning of the year |  | 253 |  | 939 |  | 139 |  | 162 |  | 115 |  | 19 |  | 535 |  | 2,162
Additions |  |  |  |  |  |  |  |  |  | 55 |  | 2 |  |  |  | 57
Net (impairments) reversals |  | (25) |  |  |  | (134) |  | (37) |  |  |  |  |  |  |  | (196)
Reclassification to proved mineral interest |  |  |  |  |  | (2) |  |  |  | (61) |  | (2) |  | (25) |  | (90)
Currency translation differences |  | (25) |  | (79) |  | (3) |  | (11) |  | (9) |  | (1) |  | (42) |  | (170)
Book amount at the end of the year |  | 203 |  | 860 |  |  |  | 114 |  | 100 |  | 18 |  | 468 |  | 1,763
2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Book amount at the beginning of the year |  | 769 |  | 921 |  | 77 |  | 103 |  | 77 |  | 29 |  | 502 |  | 2,478
Additions |  |  |  |  |  |  |  | 97 |  | 135 |  | 1 |  | 23 |  | 256
Net (impairments) reversals |  | (533) |  |  |  | 65 |  | (27) |  |  |  |  |  |  |  | (495)
Reclassification to proved mineral interest |  |  |  |  |  | (4) |  | (14) |  | (99) |  | (12) |  |  |  | (129)
Currency translation differences |  | 17 |  | 18 |  | 1 |  | 3 |  | 2 |  | 1 |  | 10 |  | 52
Book amount at the end of the year |  | 253 |  | 939 |  | 139 |  | 162 |  | 115 |  | 19 |  | 535 |  | 2,162

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