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Cost of sales (Tables) | 9 Months Ended
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Sep. 30, 2025
Cost of sales |
Schedule of cost of sales | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 30, | ​ | September 30, | ​ | September 30,
​ |  | 2025 |  | 2024 |  | 2025 |  | 2024
​ | ​ | $'m | ​ | $'m | ​ | $'m | ​ | $'m
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Power generation | ​ | 91.0 | ​ | 84.3 | ​ | 258.4 | ​ | 263.8
Depreciation | ​ | 75.4 | ​ | 75.4 | ​ | 226.9 | ​ | 223.1
Amortization(a) | ​ | 26.5 | ​ | 9.2 | ​ | 46.8 | ​ | 28.8
Tower repairs and maintenance | ​ | 16.2 | ​ | 13.0 | ​ | 43.3 | ​ | 37.5
Staff costs | ​ | 8.1 | ​ | 5.8 | ​ | 23.3 | ​ | 18.6
Regulatory fees | ​ | 6.2 | ​ | (2.8) | ​ | 20.0 | ​ | 11.7
Security services | ​ | 6.0 | ​ | 5.2 | ​ | 16.7 | ​ | 13.1
Travel costs | ​ | 2.1 | ​ | 0.7 | ​ | 4.9 | ​ | 4.0
Net impairment of property, plant and equipment, intangible assets excluding goodwill and related prepaid land rent | ​ | 1.8 | ​ | 1.2 | ​ | 5.4 | ​ | 10.1
Insurance | ​ | 0.8 | ​ | 1.1 | ​ | 2.5 | ​ | 3.5
Short-term rental | ​ | 0.5 | ​ | 2.4 | ​ | 1.9 | ​ | 6.1
Vehicle maintenance and repairs | ​ | 0.5 | ​ | 0.5 | ​ | 1.5 | ​ | 1.4
Professional fees | ​ | 0.5 | ​ | 0.5 | ​ | 1.1 | ​ | 1.3
Impairment of assets held for sale | ​ | — | ​ | 2.9 | ​ | — | ​ | 2.9
Other(b) | ​ | 3.4 | ​ | 2.3 | ​ | 11.0 | ​ | 36.8
​ | ​ | 239.0 | ​ | 201.7 | ​ | 663.7 | ​ | 662.7
(a) | Included in Amortization for the three and nine months ended September 30, 2025, is an accelerated amortization of $13.8 million on Customer related intangible assets due to our customer Oi Brazil's insolvency proceedings.
(b) | Included in “Other” for the nine months ended September 30, 2024, is a net foreign exchange loss on cost of sales of $30.4 million.

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