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Loans and financings (Details 5) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
IfrsStatementLineItems [Line Items] |  |  |
Balance at the beginning of the year | $ 1,762,633 | $ 1,725,566 |
Cash flows from activities |  |  |
Operating activities | 364,957 | 351,385 | $ 256,198
Investing activities | (297,044) | (238,120) | (270,352)
Financing activities | (185,305) | 62,446 | (34,636)
Non-cash financing transactions |  |  |
Changes in fair value of loans and financings | (2,052) | 3,627 | 525
Changes in fair value of energy forward contracts | (9,608) | (81) | 15,663
Loss on bonds repurchase | (1,905) | (3,348) |
Changes in fair value of offtake agreement | 49,254 | 3,347 | (2,268)
Balance at the end of the year | 1,705,984 | 1,762,633 | 1,725,566
Loans And Financings [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Balance at the beginning of the year | 1,762,633 | 1,725,566 |
Cash flows from activities |  |  |
Operating activities | (139,271) | (128,068) |
Investing activities |  |  |
Financing activities | (95,373) | 110,387 |
Non-cash financing transactions |  |  |
Interest, foreign exchange and other financial effects | 110,268 | 193,675 |
Changes in fair value of loans and financings | (2,052) | 3,627 |
Changes in debt modification gain |  | (3,142) |
Changes in fair value of derivative financial instruments |  |  |
Changes in fair value of energy forward contracts |  |  |
Fair value of financial instruments in commodity contracts |  |  |
Price cap realized in offtake agreement |  |  |
Changes in fair value of financial liabilities related to changes in the Company’s own credit risk | 328 | 1,572 |
Addition of new contracts |  |  |
Dividends distribution to non-controlling interests |  |  |
Cash flow hedge accounting |  |  |
Currency translation adjustment | 67,546 | (140,984) |
Loss on bonds repurchase | 1,905 |  |
Changes in fair value of offtake agreement |  |  |
Renegotiation of contracts |  |  |
Balance at the end of the year | 1,705,984 | 1,762,633 | 1,725,566
Leases Liabilities [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Balance at the beginning of the year | 95,899 | 77,405 |
Cash flows from activities |  |  |
Operating activities | (9,807) | (11,645) |
Investing activities | 3,745 |  |
Financing activities | (43,616) | (32,056) |
Non-cash financing transactions |  |  |
Interest, foreign exchange and other financial effects | 5,994 | 2,652 |
Changes in fair value of loans and financings |  |  |
Changes in debt modification gain |  |  |
Changes in fair value of derivative financial instruments |  |  |
Changes in fair value of energy forward contracts |  |  |
Fair value of financial instruments in commodity contracts |  |  |
Price cap realized in offtake agreement |  |  |
Changes in fair value of financial liabilities related to changes in the Company’s own credit risk |  |  |
Addition of new contracts | 54,296 | 65,099 |
Dividends distribution to non-controlling interests |  |  |
Cash flow hedge accounting |  |  |
Currency translation adjustment | 6,704 | (5,556) |
Loss on bonds repurchase |  |  |
Changes in fair value of offtake agreement |  |  |
Renegotiation of contracts | 7,919 |  |
Balance at the end of the year | 121,134 | 95,899 | 77,405
Other Financial Instruments Net [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Balance at the beginning of the year | 31,852 | 38,229 |
Cash flows from activities |  |  |
Operating activities | (1,687) | (4,762) |
Investing activities |  |  |
Financing activities |  |  |
Non-cash financing transactions |  |  |
Interest, foreign exchange and other financial effects | 15 | (150) |
Changes in fair value of loans and financings |  |  |
Changes in debt modification gain |  |  |
Changes in fair value of derivative financial instruments | (4,116) | (194) |
Changes in fair value of energy forward contracts | (9,608) | (81) |
Fair value of financial instruments in commodity contracts |  | 3,347 |
Price cap realized in offtake agreement | (5,011) | (3,246) |
Changes in fair value of financial liabilities related to changes in the Company’s own credit risk |  |  |
Addition of new contracts |  |  |
Dividends distribution to non-controlling interests |  |  |
Cash flow hedge accounting | 5,150 | 872 |
Currency translation adjustment | 1,277 | (2,163) |
Loss on bonds repurchase |  |  |
Changes in fair value of offtake agreement | 49,254 |  |
Renegotiation of contracts |  |  |
Balance at the end of the year | 67,126 | 31,852 | 38,229
Dividends Payables [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Balance at the beginning of the year | 3,707 | 2,830 |
Cash flows from activities |  |  |
Operating activities | (1,226) |  |
Investing activities |  |  |
Financing activities | (34,267) | (15,529) |
Non-cash financing transactions |  |  |
Interest, foreign exchange and other financial effects | (303) | 2,422 |
Changes in fair value of loans and financings |  |  |
Changes in debt modification gain |  |  |
Changes in fair value of derivative financial instruments |  |  |
Changes in fair value of energy forward contracts |  |  |
Fair value of financial instruments in commodity contracts |  |  |
Price cap realized in offtake agreement |  |  |
Changes in fair value of financial liabilities related to changes in the Company’s own credit risk |  |  |
Addition of new contracts |  |  |
Dividends distribution to non-controlling interests | 57,289 | 17,351 |
Cash flow hedge accounting |  |  |
Currency translation adjustment | 1,718 | (3,367) |
Loss on bonds repurchase |  |  |
Changes in fair value of offtake agreement |  |  |
Renegotiation of contracts |  |  |
Balance at the end of the year | 26,918 | 3,707 | 2,830
Attributable To N E X As Shareholders [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Balance at the beginning of the year | 813,930 | 1,197,324 |
Cash flows from activities |  |  |
Operating activities | 116,583 | (205,030) |
Investing activities | 997 |  |
Financing activities | (12,887) | (4,635) |
Non-cash financing transactions |  |  |
Interest, foreign exchange and other financial effects | 19,701 | (9,082) |
Changes in fair value of loans and financings |  |  |
Changes in debt modification gain |  |  |
Changes in fair value of derivative financial instruments |  |  |
Changes in fair value of energy forward contracts |  |  |
Fair value of financial instruments in commodity contracts |  |  |
Price cap realized in offtake agreement |  |  |
Changes in fair value of financial liabilities related to changes in the Company’s own credit risk | (328) | (1,572) |
Addition of new contracts |  |  |
Dividends distribution to non-controlling interests |  |  |
Cash flow hedge accounting | (3,691) | 644 |
Currency translation adjustment | 68,629 | (163,719) |
Loss on bonds repurchase |  |  |
Changes in fair value of offtake agreement |  |  |
Renegotiation of contracts |  |  |
Balance at the end of the year | 1,002,934 | 813,930 | 1,197,324
Attributable To Noncontrolling Interests [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Balance at the beginning of the year | 246,363 | 254,713 |
Cash flows from activities |  |  |
Operating activities | 90,518 | 17,623 |
Investing activities |  |  |
Financing activities | 838 | 4,279 |
Non-cash financing transactions |  |  |
Interest, foreign exchange and other financial effects |  |  |
Changes in fair value of loans and financings |  |  |
Changes in debt modification gain |  |  |
Changes in fair value of derivative financial instruments |  |  |
Changes in fair value of energy forward contracts |  |  |
Fair value of financial instruments in commodity contracts |  |  |
Price cap realized in offtake agreement |  |  |
Changes in fair value of financial liabilities related to changes in the Company’s own credit risk |  |  |
Addition of new contracts |  |  |
Dividends distribution to non-controlling interests | (57,289) | (17,351) |
Cash flow hedge accounting |  |  |
Currency translation adjustment | 6,199 | (12,901) |
Loss on bonds repurchase |  |  |
Changes in fair value of offtake agreement |  |  |
Renegotiation of contracts |  |  |
Balance at the end of the year | $ 286,629 | $ 246,363 | $ 254,713

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