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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2018
Other Commitments [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)
2018

 
2017

 
2016

PUD contract costs
$
80,165

 
$
73,827

 
$
77,667



As of December 31, 2018, 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 Capacity

 
Estimated 2019 Costs
 
2019 Debt Service Costs
 
Interest included in 2019 Debt Service Costs
 
Debt Outstanding
Chelan County PUD:
 
 
 
 
 
 
 
 
 
 
 
 
 
Rock Island Project
2031
 
25.0
%
 
156

 
$
29,794

 
$
10,058

 
$
5,053

 
$
80,058

Rocky Reach Project
2031
 
25.0

 
325

 
30,378

 
5,240

 
2,297

 
36,289

Douglas County PUD:
 
 
 
 
 

 
 
 
 
 
 
 
 
Wells Project1
2028
 
25.3

 
212

 
32,662

 
—

 
—

 
—

Grant County PUD:
 
 
 
 
 

 
 
 
 
 
 
 
 
Priest Rapids Development
2052
 
0.6

 
6

 
2,099

 
1,166

 
1,166

 
13,040

Wanapum Development
2052
 
0.6

 
7

 
2,099

 
1,166

 
1,166

 
13,040

Total
 
 
 
 
706

 
$
97,032

 
$
17,630

 
$
9,682

 
$
142,427


_______________
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.
The Company's expenses under these PUD contracts were as follows for the years ended December 31:
(Dollars in Thousands)
2018

 
2017

 
2016

PUD contract costs
$
80,165

 
$
73,827

 
$
77,667
Schedule of Long-term Purchase Commitments
The quantified obligations are based on the FERC and NEB (National Energy Board) currently authorized rates, which are subject to change. 
Natural Gas Supply and Demand Charge Obligations
(Dollars in Thousands)
2019

 
2020

 
2021

 
2022

 
2023

 
Thereafter

 
Total

Natural gas supply
$
311,601

 
$
162,384

 
$
157,156

 
$
144,008

 
$
91,851

 
$
—

 
$
867,000

Firm transportation service
165,719

 
160,053

 
140,239

 
139,343

 
120,486

 
209,215

 
935,055

Firm storage service
8,899

 
7,908

 
3,108

 
1,619

 
504

 
353

 
22,391

Short-term natural gas supply contracts
37,589

 
5,734

 
931

 
—

 
—

 
—

 
44,254

Total
$
523,808

 
$
336,079

 
$
301,434

 
$
284,970

 
$
212,841

 
$
209,568

 
$
1,868,700

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)
2019

 
2020

 
2021

 
2022

 
2023

 
Thereafter

 
Total

Energy production service contracts
$
27,243

 
$
27,915

 
$
28,650

 
$
29,345

 
$
30,056

 
$
124,646

 
$
267,855

Automated meter reading system
45,080

 
44,193

 
44,741

 
45,416

 
46,106

 
142,724

 
368,260

Total
$
72,323

 
$
72,108

 
$
73,391

 
$
74,761

 
$
76,162

 
$
267,370

 
$
636,115


These contracts have varying terms and may include escalation and termination provisions.
(Dollars in Thousands)
2019

 
2020

 
2021

 
2022

 
2023

 
Thereafter

 
Total

Columbia River projects
$
92,905

 
$
86,691

 
$
76,378

 
$
85,807

 
$
87,452

 
$
631,283

 
$
1,060,516

Other utilities
888

 
—

 
—

 
—

 
—

 
—

 
888

Non-utility contracts
216,539

 
255,193

 
264,262

 
264,740

 
269,886

 
1,221,204

 
2,491,824

Short-term electric supply contracts
117,040


4,029

 
—


—


—


—

 
121,069

Total
$
427,372

 
$
345,913

 
$
340,640

 
$
350,547

 
$
357,338

 
$
1,852,487

 
$
3,674,297