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Intangible assets and goodwill (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible assets consist of the following:
2020 | Cost |  | Accumulated amortization |  | Net book value
Power sales contracts | $ | 57,943 |  |  | $ | 41,184 |  |  | $ | 16,759 |
Customer relationships (note 3) | 83,342 |  |  | 10,967 |  |  | 72,375 |
Interconnection agreements | 15,028 |  |  | 1,458 |  |  | 13,570 |
Other (a) | 12,209 |  |  | — |  |  | 12,209 |
| $ | 168,522 |  |  | $ | 53,609 |  |  | $ | 114,913 |
(a) Other includes brand names, water rights and miscellaneous intangibles (note 3)
2019 | Cost |  | Accumulated amortization |  | Net book value
Power sales contracts | $ | 56,206 |  |  | $ | 38,931 |  |  | $ | 17,275 |
Customer relationships | 26,797 |  |  | 10,104 |  |  | 16,693 |
Interconnection agreements | 14,827 |  |  | 1,179 |  |  | 13,648 |
| $ | 97,830 |  |  | $ | 50,214 |  |  | $ | 47,616 |
Goodwill | All goodwill pertains to the Regulated Services Group.
| 2020 |  | 2019
Opening balance | $ | 1,031,696 |  |  | $ | 954,282 |
Business acquisitions (note 3) | 167,209 |  |  | 76,313 |
Foreign exchange | 9,485 |  |  | 1,101 |
Closing balance | $ | 1,208,390 |  |  | $ | 1,031,696 |

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