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Property, plant and equipment (Tables) | 12 Months Ended
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Dec. 31, 2019
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
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
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying amount - beginning of the year |  | 1,313 |  | 45,782 |  | 3,877 |  | 1,371 |  | 9,469 |  | 1,346 |  | 63,158
Additions |  | 18 |  | 432 |  | 173 |  | 330 |  | 6,947 |  | 878 |  | 8,778
Depreciation (*) |  | (65) |  | (6,012) |  | (529) |  | — |  | — |  | — |  | (6,606)
Reversal |  | 41 |  | 299 |  | 86 |  | — |  | — |  | — |  | 426
Impairment |  | (61) |  | (477) |  | (73) |  | — |  | (548) |  | (117) |  | (1,276)
Write-off |  | — |  | (12) |  | (1) |  | (66) |  | (4) |  | (1) |  | (84)
Disposals |  | (2) |  | (400) |  | (9) |  | (32) |  | (198) |  | 2 |  | (639)
Currency translation differences |  | 2 |  | 1,623 |  | 36 |  | 53 |  | 385 |  | (1) |  | 2,098
Changes in the scope of consolidation |  | 1 |  | (4,388) |  | 32 |  | (58) |  | (474) |  | 10 |  | (4,877)
Transfers |  | 81 |  | 6,795 |  | 461 |  | (294) |  | (6,501) |  | (542) |  |
Other changes |  | (54) |  | (786) |  | (152) |  | (37) |  | 119 |  | 234 |  | (676)
Net carrying amount - end of the year |  | 1,274 |  | 42,856 |  | 3,901 |  | 1,267 |  | 9,195 |  | 1,809 |  | 60,302
Gross carrying amount - end of the year |  | 4,060 |  | 135,467 |  | 27,516 |  | 1,267 |  | 12,559 |  | 2,415 |  | 183,284
Provisions for depreciation and impairments |  | 2,786 |  | 92,611 |  | 23,615 |  | — |  | 3,364 |  | 606 |  | 122,982
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) |  | 2019 |  | 2018 |  | 2017
Costs for exploratory wells suspended - beginning of the year |  | 1,101 |  | 1,263 |  | 1,684
Increases for which is ongoing the determination of proved reserves |  | 368 |  | 235 |  | 451
Amounts previously capitalized and expensed in the year |  | (183) |  | (61) |  | (217)
Reclassification to successful exploratory wells following the estimation of proved reserves |  | (46) |  | (297) |  | (278)
Disposals |  | (15) |  | (6) |  | (199)
Changes in the scope of consolidation |  | — |  | (58) |  | —
Reclassification to assets held for sale |  | — |  | (24) |  | —
Currency translation differences |  | 21 |  | 49 |  | (178)
Costs for exploratory wells suspended - end of the year |  | 1,246 |  | 1,101 |  | 1,263
The following information relates to the stratification of the suspended wells pending final determination (ageing):
|  | 2019 |  | 2018 |  | 2017
|  |  |  | (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 |  | 185 |  | 7.7 |  | 111 |  | 7.0 |  | 222 |  | 8.0
- between 1 and 3 years |  | 171 |  | 6.4 |  | 87 |  | 2.9 |  | 241 |  | 3.9
- beyond 3 years |  | 890 |  | 26.4 |  | 903 |  | 24.2 |  | 800 |  | 21.4
|  | 1,246 |  | 40.5 |  | 1,101 |  | 34.1 |  | 1,263 |  | 33.3
Costs capitalized for suspended wells |  |  |  |  |  |  |  |  |  |  |  |
- fields including wells drilled over the last 12 months |  | 185 |  | 7.7 |  | 111 |  | 7.0 |  | 148 |  | 5.9
- fields for which the delineation campaign is in progress |  | 556 |  | 11.3 |  | 217 |  | 4.7 |  | 261 |  | 4.7
- fields including commercial discoveries that proceeds to sanctioning |  | 505 |  | 21.5 |  | 773 |  | 22.4 |  | 854 |  | 22.7
|  | 1,246 |  | 40.5 |  | 1,101 |  | 34.1 |  | 1,263 |  | 33.3
Schedule of unproved mineral interests | Unproved mineral interests 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
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
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Book amount at the beginning of the year |  | 1,162 |  | 825 |  | 192 |  | 99 |  | 105 |  | 7 |  |  |  | 2,390
Additions |  | 26 |  | 56 |  |  |  |  |  |  |  | 23 |  | 487 |  | 592
Net (impairments) reversals |  | (429) |  |  |  | (76) |  |  |  |  |  |  |  |  |  | (505)
Reclassification to proved mineral interest |  | (32) |  |  |  | (44) |  |  |  | (32) |  | (2) |  |  |  | (110)
Other changes and currency translation differences |  | 42 |  | 40 |  | 5 |  | 4 |  | 4 |  | 1 |  | 15 |  | 111
Book amount at the end of the year |  | 769 |  | 921 |  | 77 |  | 103 |  | 77 |  | 29 |  | 502 |  | 2,478

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