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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following tables set forth the components of the Company’s accumulated other comprehensive income (loss) at:
Puget Energy
December 31,
(Dollars in Thousands)
2014
2013
Net unrealized loss on energy derivative instruments
$
(333
)
$
(705
)
Net unrealized loss on interest rate swaps
—

(94
)
Net unrealized loss and prior service cost on pension plans
(36,710
)
48,514

Total Puget Energy, net of tax
$
(37,043
)
$
47,715


Puget Sound Energy
December 31,
(Dollars in Thousands)
2014
2013
Net unrealized loss on energy derivative instruments
$
(686
)
$
(2,027
)
Net unrealized loss on treasury interest rate swaps
(5,990
)
(6,307
)
Net unrealized loss and prior service cost on pension plans
(164,281
)
(87,405
)
Total PSE, net of tax
$
(170,957
)
$
(95,739
)
The following tables present the changes in the Company’s accumulated other comprehensive income (loss) (AOCI) by component for the years ended December 31, 2014, 2013 and 2012, respectively.
Puget Energy
Net unrealized gain (loss) and prior service cost on pension plans
Net unrealized gain (loss) on energy derivative instruments
Net unrealized gain (loss) on interest rate swaps
 
Changes in AOCI, net of tax
 
(Dollars in Thousands)
Total
Balance at December 31, 2011
$
(15,195
)
$
(1,113
)
$
(14,599
)
$
(30,907
)
Other comprehensive income (loss) before reclassifications
(13,574
)
—

—

(13,574
)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax
(296
)
371

11,577

11,652

Net current-period other comprehensive income (loss)
(13,870
)
371

11,577

(1,922
)
Balance at December 31, 2012
$
(29,065
)
$
(742
)
$
(3,022
)
$
(32,829
)
Other comprehensive income (loss) before reclassifications
76,004

—

—

76,004

Amounts reclassified from accumulated other comprehensive income (loss), net of tax
1,575

37

2,928

4,540

Net current-period other comprehensive income (loss)
77,579

37

2,928

80,544

Balance at December 31, 2013
$
48,514

$
(705
)
$
(94
)
$
47,715

Other comprehensive income (loss) before reclassifications
(84,301
)
—

—

(84,301
)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax
(923
)
372

94

(457
)
Net current-period other comprehensive income (loss)
(85,224
)
372

94

(84,758
)
Balance at December 31, 2014
$
(36,710
)
$
(333
)
$
—

$
(37,043
)

Puget Sound Energy
Net unrealized gain (loss) and prior service cost on pension plans
Net unrealized gain (loss) on energy derivative instruments
Net unrealized gain (loss) on treasury interest rate swaps
 
Changes in AOCI, net of tax
 
(Dollars in Thousands)
Total
Balance at December 31, 2011
$
(168,704
)
$
(12,934
)
$
(6,941
)
$
(188,579
)
Other comprehensive income (loss) before reclassifications
(17,049
)
—

—

(17,049
)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax
9,755

8,358

317

18,430

Net current-period other comprehensive income (loss)
(7,294
)
8,358

317

1,381

Balance at December 31, 2012
$
(175,998
)
$
(4,576
)
$
(6,624
)
$
(187,198
)
Other comprehensive income (loss) before reclassifications
74,969

—

—

74,969

Amounts reclassified from accumulated other comprehensive income (loss), net of tax
13,624

2,549

317

16,490

Net current-period other comprehensive income (loss)
88,593

2,549

317

91,459

Balance at December 31, 2013
$
(87,405
)
$
(2,027
)
$
(6,307
)
$
(95,739
)
Other comprehensive income (loss) before reclassifications
(84,955
)
—

—

(84,955
)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax
8,079

1,341

317

9,737

Net current-period other comprehensive income (loss)
(76,876
)
1,341

317

(75,218
)
Balance at December 31, 2014
$
(164,281
)
$
(686
)
$
(5,990
)
$
(170,957
)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Details about these reclassifications out of accumulated other comprehensive income (loss) for the years ended December 31, 2014, 2013 and 2012, respectively, are as follows:

Puget Energy
 
 
 
 
(Dollars in Thousands)
 
 
 
 
Details about accumulated other comprehensive income (loss) components
Affected line item in the statement where net income (loss) is presented
Amount reclassified from accumulated
other comprehensive income (loss)
2014
2013
2012
Net unrealized gain (loss) and prior service cost on pension plans:
 
 
 
 
Amortization of prior service cost
(a)
1,938

1,997

1,980

Amortization of net gain (loss)
(a)
(519
)
(4,420
)
(1,524
)
 
Total before tax
1,419

(2,423
)
456

 
Tax (expense) or benefit
(496
)
848

(160
)
 
Net of Tax
$
923

$
(1,575
)
$
296

Net unrealized gain (loss) on energy derivative instruments:
 
 
 
 
Commodity contracts: Electric derivatives
Electric generation fuel
—

—

100

 
Purchased electricity
(572
)
(57
)
(671
)
 
Total before tax
(572
)
(57
)
(571
)
 
Tax (expense) or benefit
200

20

200

 
Net of Tax
$
(372
)
$
(37
)
$
(371
)
Net unrealized gain (loss) on interest rate swaps:
 
 
 
 
Interest rate contracts
Interest expense
$
(144
)
$
(4,505
)
$
(17,811
)
 
Tax (expense) or benefit
50

1,577

6,234

 
Net of Tax
$
(94
)
$
(2,928
)
$
(11,577
)
Total reclassification for the period
Net of Tax
$
457

$
(4,540
)
$
(11,652
)
__________
(a) 
These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 12 for additional details).

Puget Sound Energy
 
 
 
 
(Dollars in Thousands)
 
 
 
 
Details about accumulated other comprehensive income (loss) components
Affected line item in the statement where net income (loss) is presented
Amount reclassified from accumulated
other comprehensive income (loss)
2014
2013
2012
Net unrealized gain (loss) and prior service cost on pension plans:
 
 
 
 
Amortization of prior service cost
(a)
$
1,526

$
1,559

$
1,245

Amortization of net gain (loss)
(a)
(13,954
)
(22,519
)
(16,203
)
Amortization of transition obligation
(a)
—

—

(50
)
 
Total before tax
(12,428
)
(20,960
)
(15,008
)
 
Tax (expense) or benefit
4,349

7,336

5,253

 
Net of tax
$
(8,079
)
$
(13,624
)
$
(9,755
)
Net unrealized gain (loss) on energy derivative instruments:
 
 
 
 
Commodity contracts: Electric derivatives
Electric generation fuel
—

—

97

 
Purchased electricity
(2,063
)
(3,922
)
(12,955
)
 
Total before tax
(2,063
)
(3,922
)
(12,858
)
 
Tax (expense) or benefit
722

1,373

4,500

 
Net of Tax
$
(1,341
)
$
(2,549
)
$
(8,358
)
Net unrealized gain (loss) on treasury interest rate swaps:
 
 
 
 
Interest rate contracts
Interest expense
(488
)
(488
)
(488
)
 
Tax (expense) or benefit
171

171

171

 
Net of Tax
$
(317
)
$
(317
)
$
(317
)
Total reclassification for the period
Net of Tax
$
(9,737
)
$
(16,490
)
$
(18,430
)
__________
(a)  
These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 12 for additional details).