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Commitments and contingencies (Tables)
 12 Months Ended
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Estimates of Future Commitments
Detailed below are estimates of future commitments under these arrangements: 

Year 1
Year 2
Year 3
Year 4
Year 5
Thereafter
Total
Power purchase (i)
$
30,672

$
11,422

$
11,338

$
11,566

$
11,796

$
179,412

$
256,206

Gas supply and service agreements (ii)
83,083

60,699

49,217

46,406

41,538

135,926

416,869

Service agreements
47,950

40,456

41,554

45,611

47,005

293,436

516,012

Capital projects
104,809

114,806

—

—

—

—

219,615

Land easements
6,603

6,673

6,744

6,835

6,918

200,891

234,664

Total
$
273,117

$
234,056

$
108,853

$
110,418

$
107,257

$
809,665

$
1,643,366


(i)
Power purchase: APUC’s electric distribution facilities have commitments to purchase physical quantities of power for load serving requirements. The commitment amounts included in the table above are based on market prices as of December 31, 2019. However, the effects of purchased power unit cost adjustments are mitigated through a purchased power rate-adjustment mechanism.
(ii)  
Gas supply and service agreements: APUC’s gas distribution facilities and thermal generation facilities have commitments to purchase physical quantities of natural gas under contracts for purposes of load serving requirements and of generating power.