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Commitments and contingencies (Details) € in Thousands, £ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2021 EUR (€) | Aug. 31, 2021 USD ($) | Aug. 31, 2021 GBP (£) | Dec. 31, 2022 USD ($) investment | Dec. 31, 2022 GBP (£) | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 GBP (£) | Dec. 31, 2021 EUR (€) | Dec. 31, 2022 GBP (£) investment | Dec. 31, 2022 EUR (€) investment | Dec. 31, 2022 CAD ($) investment
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of investments committing | investment |  |  |  |  | 2 |  |  |  |  |  | 2 | 2 | 2
Capital commitments |  |  |  |  | $ 42,576,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  | $ 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 |  |  |  |  |  |  |  | $ 2,200
Royalty expense |  |  |  |  | 0 |  |  |  |  |  |  |  |
HyCap Fund |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions |  |  | $ 9,534,000 | £ 7,215 |  | £ 7,215 |  |  |  |  |  |  |
HyCap Fund | Initial Contribution |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments | £ |  |  |  |  |  |  |  |  |  |  | £ 25,000 |  |
Contributions |  |  |  |  | 1,924,000 | £ 1,550 |  | 7,610,000 | £ 5,665 |  |  |  |
CleanH2 Fund |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions | $ 1,144,000 | € 996 |  |  |  |  | € 996 |  |  |  |  |  |
CleanH2 Fund | Initial Contribution |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital commitments | € |  |  |  |  |  |  |  |  |  |  |  | € 30,000 |
Contributions |  |  |  |  | $ 806,000 |  | € 696 | $ 338,000 |  | € 300 |  |  |

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