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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2019
Long-term Purchase Commitment [Line Items]  
Schedule of Long-term Contracts for Purchase of Electric Power
The Company's expenses under these PUD contracts were as follows for the years ended December 31, :

(Dollars in Thousands)201920182017
PUD contract costs$87,135  $80,165  $73,827  
As of December 31, 2019, the Company purchased portions of the power output of the PUDs' projects as set forth in the following table:
Company's Current Share of
(Dollars in Thousands)Contract
Expiration		Percent of
Output		Megawatt CapacityEstimated 2020 Costs2020 Debt Service CostsInterest included in 2020 Debt Service CostsDebt Outstanding
Chelan County PUD:
Rock Island Project203125.0 %156$34,180  $11,499  $5,681  $96,956  
Rocky Reach Project203125.0  32531,190  4,940  2,129  33,317  
Douglas County PUD:
Wells Project1
202827.1  22843,004  —  —  —  
Grant County PUD:
Priest Rapids Development20520.6  61,831  1,085  586  12,793  
Wanapum Development20520.6  71,831  1,085  586  12,793  
Total722$112,036  $18,609  $8,982  $155,859  
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1.In March 2017, PSE entered a new PPA with Douglas County PUD for Wells Project output that begins upon expiration of the existing contract on August 31, 2018, and continues through September 30, 2028.
Schedule of Long-term Purchase Commitments
The following table summarizes the Company’s estimated obligations for service contracts through the terms of its existing contracts.
Service Contract Obligations
(Dollars in Thousands)		20202021202220232024ThereafterTotal
Energy production service contracts$28,474  $29,219  $29,923  $30,645  $31,400  $141,817  $291,478  
Automated meter reading system43,971  44,849  45,526  46,218  46,926  96,149  323,639  
Total$72,445  $74,068  $75,449  $76,863  $78,326  $237,966  $615,117  
Electricity, Purchased [Member]  
Long-term Purchase Commitment [Line Items]  
Schedule of Long-term Purchase Commitments These contracts have varying terms and may include escalation and termination provisions.
(Dollars in Thousands)20202021202220232024ThereafterTotal
Columbia River projects$121,680  $111,125  $103,879  $103,377  $102,976  $609,912  $1,152,949  
Electric portfolio contracts263,940  300,795  302,838  307,888  315,593  969,383  2,460,437  
Electric wholesale market transactions188,822  24,901  3,190  —  —  —  216,913  
Total$574,442  $436,821  $409,907  $411,265  $418,569  $1,579,295  $3,830,299  
Natural Gas, US Regulated [Member]  
Long-term Purchase Commitment [Line Items]  
Schedule of Long-term Purchase Commitments
The following table summarizes the Company’s obligations for future natural gas supply and demand charges through the primary terms of its existing contracts.  The quantified obligations are based on the FERC and CER (Canadian Energy Regulator) currently authorized rates, which are subject to change.
Natural Gas Supply and Demand Charge Obligations
(Dollars in Thousands)		20202021202220232024ThereafterTotal
Natural gas portfolio contracts$273,263  $196,806  $178,208  $148,165  $82,509  $—  $878,951  
Firm transportation service176,741  173,133  172,190  161,508  116,842  828,136  1,628,550  
Firm storage service8,954  4,503  3,014  853  140  213  17,677  
Total$458,958  $374,442  $353,412  $310,526  $199,491  $828,349  $2,525,178