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Commitments and contingencies (Tables)
 6 Months Ended
Jun. 30, 2020
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)
$
29,028

$
11,585

$
11,506

$
11,735

$
11,913

$
173,436

$
249,203

Gas supply and service agreements (ii)
78,698

55,000

49,588

42,756

39,758

129,584

395,384

Service agreements
50,661

40,697

43,813

46,436

46,375

268,663

496,645

Capital projects
543,211

—

—

—

—

—

543,211

Land easements
6,607

6,641

6,718

6,810

6,887

195,434

229,097

Total
$
708,205

$
113,923

$
111,625

$
107,737

$
104,933

$
767,117

$
1,913,540


(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 June 30, 2020. 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.