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Fixed assets (Schedule of Fixed Assets) (Details) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Balance | [1] | € 73,274 | € 72,564 |
Balance |  | 78,837 | 73,274 | [1]
Photovoltaic Plants [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Balance |  | 87,922 |  |
Cost [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Balance |  | 93,171 | 88,049 |
Additions |  | 10,081 | 5,122 |
Balance |  | 103,252 | 93,171 |
Cost [Member] | Photovoltaic Plants [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Balance |  | 87,921 | 87,880 |
Additions |  | 1 | 41 |
Balance |  | 87,922 | 87,921 |
Cost [Member] | Biogas installation [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Balance |  | 5,081 |  |
Additions |  | 10,076 | 5,081 |
Balance |  | 15,157 | 5,081 |
Cost [Member] | Office furniture and equipment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Balance |  | 117 | 117 |
Additions |  | 4 |  |
Balance |  | 121 | 117 |
Cost [Member] | Leasehold Improvements [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Balance |  | 52 | 52 |
Additions |  |  |  |
Balance |  | 52 | 52 |
Depreciation [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Balance |  | 19,897 | 15,485 |
Depreciation for the year |  | 4,518 | 4,411 |
Effect of changes in exchange rates |  |  | 1 |
Balance |  | 24,415 | 19,897 |
Depreciation [Member] | Photovoltaic Plants [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Balance |  | 19,758 | 15,363 |
Depreciation for the year |  | 4,396 | 4,394 |
Effect of changes in exchange rates |  |  | 1 |
Balance |  | 24,154 | 19,758 |
Depreciation [Member] | Biogas installation [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Balance |  |  |  |
Depreciation for the year |  | 111 |  |
Effect of changes in exchange rates |  |  |  |
Balance |  | 111 |  |
Depreciation [Member] | Office furniture and equipment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Balance |  | 87 | 74 |
Depreciation for the year |  | 11 | 13 |
Effect of changes in exchange rates |  |  |  |
Balance |  | 98 | 87 |
Depreciation [Member] | Leasehold Improvements [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Balance |  | 52 | 48 |
Depreciation for the year |  | 52 | 4 |
Effect of changes in exchange rates |  |  |  |
Balance |  | 52 | 52 |
Carrying Amounts [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Balance |  | 73,274 | 72,564 |
Balance |  | 78,837 | 73,274 |
Carrying Amounts [Member] | Photovoltaic Plants [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Balance |  | 68,163 | 72,517 |
Balance |  | 63,768 | 68,163 |
Carrying Amounts [Member] | Biogas installation [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Balance |  | 5,081 |  |
Balance |  | 15,046 | 5,081 |
Carrying Amounts [Member] | Office furniture and equipment [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Balance |  | 30 | 43 |
Balance |  | 23 | 30 |
Carrying Amounts [Member] | Leasehold Improvements [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Balance |  |  | 4 |
Balance |  |  |  |
[1] | Please refer to note 2C for functional and presentation currency.

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