| (in thousands of euros) | Note | December 31, 2020 | December 31, 2019 | 
| ASSETS | |||
| Intangible assets: | 9.1 | ||
| Concessions and business goodwill | 2,991 | 2,991 | |
| Other intangible assets | 507 | 507 | |
| Amortization | (1,425) | (1,385) | |
| Property, plant and equipment: | 9.2 | ||
| Land | 2,291 | 2,291 | |
| Buildings | 3,044 | 3,044 | |
| Machinery and equipment | 1,133 | 1,133 | |
| Other | 37,142 | 36,152 | |
| Depreciation of property, plant and equipment | (32,601) | (30,368) | |
| Investments and other financial assets: | |||
| Long-term equity investments | 9.3 | 5,637,897 | 5,637,897 | 
| Impairment on investments | 9.3 | (98,115) | (98,115) | 
| Loans and receivables owed by associates and non-consolidated companies | 9.4 | 1,757,169 | 2,067,174 | 
| Other non-current securities | 9.5 | 0 | 1,093 | 
| Loans and other financial assets | 232 | 232 | |
| Impairment on investments and other financial assets | (31) | (31) | |
| Non-current assets | 7,310,234 | 7,622,615 | |
| Trade receivables | 1,699 | 7,864 | |
| Other receivables | 3,519 | 11,304 | |
| Marketable securities | 10 | 152,876 | 223,320 | 
| Cash and cash equivalents | 12 | 35 | |
| Current assets | 158,106 | 242,523 | |
| Prepayments | 380 | 455 | |
| Deferred expenses | 11 | 4,848 | 6,834 | 
| Bond redemption premiums | 12 | 5,129 | 7,138 | 
| Unrealized foreign exchange losses | 13 | 2 | 133,500 | 
| Total assets | 7,478,699 | 8,013,065 |