PL
EN| As at December 31, 2016 | As at December 31, 2015 | |||||
| Historical cost | Revaluation adjustments | Carrying amount | Historical cost | Revaluation adjustments | Carrying amount | |
| Materials, including | 979 | (52) | 927 | 1,067 | (103) | 964 |
| Renovation materials | 664 | (33) | 631 | 643 | (80) | 563 |
| Coal | 232 | - | 232 | 307 | - | 307 |
| Mazut | 15 | - | 15 | 14 | - | 14 |
| Investment materials | 14 | - | 14 | 16 | - | 16 |
| Other materials | 54 | (19) | 35 | 87 | (23) | 64 |
| Energy origin rights, including: | 602 | (35) | 567 | 831 | (17) | 814 |
| Green energy origin rights | 388 | (33) | 355 | 681 | (14) | 667 |
| Yellow energy origins rights | 148 | (2) | 146 | 113 | (2) | 111 |
| Other energy origin rights | 66 | - | 66 | 37 | (1) | 36 |
| Merchandise, including: | 44 | (10) | 34 | 66 | 36 | 102 |
| CO2 emission rights | 37 | (8) | 29 | 60 | 38 | 98 |
| Other merchandise | 7 | (2) | 5 | 6 | (2) | 4 |
| Other inventories | 68 | - | 68 | 79 | - | 79 |
| TOTAL INVENTORIES | 1,693 | (97) | 1,596 | 2,043 | (84) | 1,959 |
| Year ended December 31, 2016 | Year ended December 31, 2015 | |
| REVALUATION ADJUSTMENT FOR INVENTORIES AS AT JANUARY 1 | (84) | (63) |
| Fair value of CO2 emission rights | (46) | (42) |
| Impairment allowance raised | (52) | (55) |
| Impairment allowance reversed | 66 | 58 |
| Impairment allowance used | 16 | 19 |
| Other | 3 | (1) |
| REVALUATION ADJUSTMENT FOR INVENTORIES AS AT DECEMBER 31 | (97) | (84) |
CO2 emission rights recognized in the inventories include the rights classified as held-for-sale. These rights are presented at fair value. Change in valuation of these rights in the reporting period should be analyzed together with the revaluation of forward contracts (as presented in note 7.4.1 of these consolidated financial statements).
Creation of impairment allowances related mainly to spare parts and materials as a result of their amortization or obsolescence.
As described in note 25.5 of these consolidated financial statements, PLN 51 million of inventories constituted a collateral for the repayment of liabilities or contingent liabilities.