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Intangible assets and goodwill | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible assets and goodwill | Intangible assets and goodwill Intangible assets consist of the following:
2023 | Cost |  | Accumulated amortization |  | Net book value
Power sales contracts | $ | 58,200 |  |  | $ | 43,938 |  |  | $ | 14,262 |
Customer relationships | 77,104 |  |  | 14,625 |  |  | 62,479 |
Interconnection agreements | 10,329 |  |  | 1,977 |  |  | 8,352 |
Other (a) | 10,352 |  |  | 1,507 |  |  | 8,845 |
| $ | 155,985 |  |  | $ | 62,047 |  |  | $ | 93,938 |
2022 | Cost |  | Accumulated amortization |  | Net book value
Power sales contracts | $ | 56,926 |  |  | $ | 42,818 |  |  | $ | 14,108 |
Customer relationships | 77,850 |  |  | 13,709 |  |  | 64,141 |
Interconnection agreements | 10,098 |  |  | 1,851 |  |  | 8,247 |
Other (a) | 10,338 |  |  | 151 |  |  | 10,187 |
| $ | 155,212 |  |  | $ | 58,529 |  |  | $ | 96,683 |
(a) Other includes brand names, water rights and miscellaneous intangibles Estimated amortization expense for intangible assets for each of the next five years is $2,674. All goodwill pertains to the Regulated Services Group.
| 2023 |  | 2022
Opening balance | $ | 1,320,579 |  |  | $ | 1,201,244 |
Business acquisitions | 4,195 |  |  | 123,751 |
Foreign exchange | (712) |  |  | (4,416) |
Closing balance | $ | 1,324,062 |  |  | $ | 1,320,579 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350/tableOfContent + Details
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