v3.10.0.1

Financial information by segment, Assets and liabilities by business sector (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Assets [Abstract] |  |  |  |
Contracted concessional assets | $ 8,736,368 | $ 9,084,270 |  |
Investments carried under the equity method | 53,002 | 55,784 |  |
Current financial investments | 215,148 | 210,138 |  |
Cash and cash equivalents (project companies) | 657,212 | 669,387 | $ 614,312 | $ 594,811
Total assets | 10,157,276 | 10,492,339 |  |
Liabilities [Abstract] |  |  |  |
Long-term and short-term project debt | 5,218,820 | 5,475,208 |  |
Grants and other liabilities | 1,662,379 | 1,636,060 |  |
Long-term and short-term corporate debt | 639,041 | 643,083 |  |
Total liabilities | 8,293,042 | 8,596,886 |  |
Equity | 1,864,234 | 1,895,453 | $ 2,013,130 | $ 1,959,111
Total liabilities and equity | 10,157,276 | 10,492,339 |  |
Renewable Energy [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Contracted concessional assets | 7,165,843 | 7,436,362 |  |
Investments carried under the equity method | 12,088 | 12,419 |  |
Current financial investments | 20,478 | 17,249 |  |
Cash and cash equivalents (project companies) | 455,421 | 452,792 |  |
Total assets | 7,653,830 | 7,918,822 |  |
Liabilities [Abstract] |  |  |  |
Long-term and short-term project debt | 3,958,261 | 4,162,596 |  |
Grants and other liabilities | 1,659,756 | 1,635,508 |  |
Total liabilities | 5,618,017 | 5,798,104 |  |
Efficient Natural Gas [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Contracted concessional assets | 606,883 | 660,387 |  |
Investments carried under the equity method | 0 | 0 |  |
Current financial investments | 118,323 | 116,430 |  |
Cash and cash equivalents (project companies) | 26,560 | 39,064 |  |
Total assets | 751,766 | 815,881 |  |
Liabilities [Abstract] |  |  |  |
Long-term and short-term project debt | 548,223 | 579,173 |  |
Grants and other liabilities | 788 | 552 |  |
Total liabilities | 549,011 | 579,725 |  |
Electric Transmission Lines [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Contracted concessional assets | 876,477 | 897,269 |  |
Investments carried under the equity method | 0 | 0 |  |
Current financial investments | 61,117 | 59,289 |  |
Cash and cash equivalents (project companies) | 14,712 | 15,325 |  |
Total assets | 952,306 | 971,883 |  |
Liabilities [Abstract] |  |  |  |
Long-term and short-term project debt | 680,398 | 698,346 |  |
Grants and other liabilities | 1,032 | 0 |  |
Total liabilities | 681,430 | 698,346 |  |
Water [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Contracted concessional assets | 87,165 | 90,252 |  |
Investments carried under the equity method | 40,914 | 43,365 |  |
Current financial investments | 14,460 | 14,577 |  |
Cash and cash equivalents (project companies) | 8,248 | 13,681 |  |
Total assets | 150,787 | 161,875 |  |
Liabilities [Abstract] |  |  |  |
Long-term and short-term project debt | 31,938 | 35,093 |  |
Grants and other liabilities | 803 | 0 |  |
Total liabilities | 32,741 | 35,093 |  |
Allocated [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Contracted concessional assets | 8,736,368 | 9,084,270 |  |
Investments carried under the equity method | 53,002 | 55,784 |  |
Current financial investments | 214,378 | 207,545 |  |
Cash and cash equivalents (project companies) | 504,941 | 520,862 |  |
Total assets | 9,508,689 | 9,868,461 |  |
Liabilities [Abstract] |  |  |  |
Long-term and short-term project debt | 5,218,820 | 5,475,208 |  |
Grants and other liabilities | 1,662,379 | 1,636,060 |  |
Total liabilities | 6,881,199 | 7,111,268 |  |
Unallocated [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Other non-current assets | 216,771 | 210,378 |  |
Other current assets (including cash and cash equivalents at holding company level) | 431,816 | 413,500 |  |
Total assets | 648,587 | 623,878 |  |
Liabilities [Abstract] |  |  |  |
Long-term and short-term corporate debt | 639,041 | 643,083 |  |
Other non-current liabilities | 591,456 | 657,345 |  |
Other current liabilities | 181,346 | 185,190 |  |
Total liabilities | 1,411,843 | 1,485,618 |  |
Equity | 1,864,234 | 1,895,453 |  |
Total liabilities and equity | $ 3,276,077 | $ 3,381,071 |  |

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