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Other assets - additional information (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Regulatory Asset [Line Items] |  |
Restricted cash | $ 39,478 | $ 19,897
Empire District Bondco |  |
Regulatory Asset [Line Items] |  |
Restricted cash | $ 31,136 | $ 0

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