v3.10.0.1

Financial information by segment, Assets and liabilities by business sector (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Assets allocated [Abstract] |  |  |  |
Contracted concessional assets | $ 8,606,943 | $ 9,084,270 |  |
Investments carried under the equity method | 54,776 | 55,784 |  |
Current financial investments | 237,080 | 210,138 |  |
Cash and cash equivalents (project companies) | 744,636 | 669,387 | $ 794,094 | $ 594,811
Total assets | 10,172,531 | 10,492,339 |  |
Liabilities allocated [Abstract] |  |  |  |
Long-term and short-term project debt | 5,214,675 | 5,475,208 |  |
Grants and other liabilities | 1,653,451 | 1,636,060 |  |
Long-term and short-term corporate debt | 641,785 | 643,083 |  |
Total liabilities | 8,279,300 | 8,596,886 |  |
Equity | 1,893,231 | 1,895,453 | $ 2,039,380 | $ 1,959,111
Total liabilities and equity | 10,172,531 | 10,492,339 |  |
Renewable Energy [Member] |  |  |  |
Assets allocated [Abstract] |  |  |  |
Contracted concessional assets | 7,058,009 | 7,436,362 |  |
Investments carried under the equity method | 11,936 | 12,419 |  |
Current financial investments | 15,616 | 17,249 |  |
Cash and cash equivalents (project companies) | 569,075 | 452,792 |  |
Total assets | 7,654,636 | 7,918,822 |  |
Liabilities allocated [Abstract] |  |  |  |
Long-term and short-term project debt | 3,977,074 | 4,162,596 |  |
Grants and other liabilities | 1,650,795 | 1,635,508 |  |
Total liabilities | 5,627,869 | 5,798,104 |  |
Efficient Natural Gas [Member] |  |  |  |
Assets allocated [Abstract] |  |  |  |
Contracted concessional assets | 591,666 | 660,387 |  |
Investments carried under the equity method | 0 | 0 |  |
Current financial investments | 133,505 | 116,430 |  |
Cash and cash equivalents (project companies) | 16,742 | 39,064 |  |
Total assets | 741,913 | 815,881 |  |
Liabilities allocated [Abstract] |  |  |  |
Long-term and short-term project debt | 547,045 | 579,173 |  |
Grants and other liabilities | 835 | 552 |  |
Total liabilities | 547,880 | 579,725 |  |
Electric Transmission Lines [Member] |  |  |  |
Assets allocated [Abstract] |  |  |  |
Contracted concessional assets | 869,682 | 897,269 |  |
Investments carried under the equity method | 0 | 0 |  |
Current financial investments | 72,398 | 59,289 |  |
Cash and cash equivalents (project companies) | 13,743 | 15,325 |  |
Total assets | 955,823 | 971,883 |  |
Liabilities allocated [Abstract] |  |  |  |
Long-term and short-term project debt | 659,808 | 698,346 |  |
Grants and other liabilities | 1,030 | 0 |  |
Total liabilities | 660,838 | 698,346 |  |
Water [Member] |  |  |  |
Assets allocated [Abstract] |  |  |  |
Contracted concessional assets | 87,586 | 90,252 |  |
Investments carried under the equity method | 42,840 | 43,365 |  |
Current financial investments | 14,678 | 14,577 |  |
Cash and cash equivalents (project companies) | 9,993 | 13,681 |  |
Total assets | 155,097 | 161,875 |  |
Liabilities allocated [Abstract] |  |  |  |
Long-term and short-term project debt | 30,748 | 35,093 |  |
Grants and other liabilities | 791 | 0 |  |
Total liabilities | 31,539 | 35,093 |  |
Allocated [Member] |  |  |  |
Assets allocated [Abstract] |  |  |  |
Contracted concessional assets | 8,606,943 | 9,084,270 |  |
Investments carried under the equity method | 54,776 | 55,784 |  |
Current financial investments | 236,197 | 207,545 |  |
Cash and cash equivalents (project companies) | 609,553 | 520,862 |  |
Total assets | 9,507,469 | 9,868,461 |  |
Liabilities allocated [Abstract] |  |  |  |
Long-term and short-term project debt | 5,214,675 | 5,475,208 |  |
Grants and other liabilities | 1,653,451 | 1,636,060 |  |
Total liabilities | 6,868,126 | 7,111,268 |  |
Unallocated [Member] |  |  |  |
Assets allocated [Abstract] |  |  |  |
Other non-current assets | 213,053 | 210,378 |  |
Other current assets (including cash and cash equivalents at holding company level) | 452,009 | 413,500 |  |
Total assets | 665,062 | 623,878 |  |
Liabilities allocated [Abstract] |  |  |  |
Long-term and short-term corporate debt | 641,785 | 643,083 |  |
Other non-current liabilities | 597,097 | 657,345 |  |
Other current liabilities | 172,292 | 185,190 |  |
Total liabilities | 1,411,174 | 1,485,618 |  |
Equity | 1,893,231 | 1,895,453 |  |
Total liabilities and equity | $ 3,304,405 | $ 3,381,071 |  |

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