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Commitments and contingencies (Details) € in Thousands, £ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended | 37 Months Ended | 41 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) | Aug. 31, 2021 GBP (£) | Dec. 31, 2024 USD ($) investment | Dec. 31, 2024 GBP (£) | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 GBP (£) | Dec. 31, 2023 EUR (€) | Dec. 31, 2024 EUR (€) | Dec. 31, 2024 USD ($) investment | Dec. 31, 2024 GBP (£) investment | Dec. 31, 2024 EUR (€) investment | Dec. 31, 2024 CAD ($) investment
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of investments committing | investment |  |  | 2 |  |  |  |  |  |  | 2 | 2 | 2 | 2
Property, plant and equipment [member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments |  |  | $ 14,512,000 |  |  |  |  |  |  | $ 14,512,000 |  |  |
Hydrogen Supply Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments |  |  | $ 9,441,000 |  |  |  |  |  |  | 9,441,000 |  |  |
Capital commitments, term |  |  | 5 years | 5 years | 5 years |  |  |  |  |  |  |  |
Templewater |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions (Proceeds) |  |  | $ 527,000 |  |  |  |  |  |  |  |  |  |
Initial Contribution | Templewater |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments |  |  | $ 1,000,000 |  |  |  |  |  |  | 1,000,000 |  |  |
Royalty related to UTC, revenue obligations |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration period (years) |  |  | 15 years | 15 years | 15 years |  |  |  |  |  |  |  |
Royalty payments |  |  | $ 0 |  |  | $ 0 |  |  |  |  |  |  |
Royalty obligation, percentage |  |  | 2.00% | 2.00% | 2.00% |  |  |  |  |  |  |  |
Maximum royalty expense |  |  | $ 4,613,000 |  |  |  |  |  |  | 4,613,000 |  |  | $ 5,351
Royalty expense |  |  | $ 0 |  |  |  |  |  |  |  |  |  |
Royalty of other revenue obligations |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty obligation, percentage |  |  | 2.00% | 2.00% | 2.00% |  |  |  |  |  |  |  |
Maximum royalty expense |  |  | $ 1,896,000 |  |  |  |  |  |  | 1,896,000 |  |  | $ 2,200
Royalty expense |  |  | 0 |  |  |  |  |  |  |  |  |  |
HyCap Fund |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions (Proceeds) |  | £ 15,755 |  | £ 15,754 |  |  |  |  |  | $ 20,314,000 |  |  |
HyCap Fund | Initial Contribution |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments | £ |  |  |  |  |  |  |  |  |  |  | £ 25,000 |  |
Contributions (Proceeds) |  |  | 6,102,000 | £ 4,768 |  | 4,624,000 | £ 3,771 |  |  |  |  |  |
CleanH2 Fund |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions (Proceeds) | $ 10,475,000 |  |  |  | € 9,663 |  |  |  | € 9,663 |  |  |  |
CleanH2 Fund | Initial Contribution |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments | € |  |  |  |  |  |  |  |  |  |  |  | € 30,000 |
Contributions (Proceeds) |  |  | $ 5,328,000 |  | € 4,962 | $ 3,983,000 |  | € 3,705 |  |  |  |  |

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