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Accumulated Other Comprehensive Income (Tables)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
PUGET ENERGY [Member]
    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Schedule of Accumulated Other Comprehensive Income (Loss)  
The following tables present the changes in the Company’s accumulated other comprehensive income (loss) (AOCI) by component for the three and six months ended June 30, 2013:

Puget Energy
Net unrealized gain (loss) on interest rate swaps
Net unrealized gain (loss) and prior service cost on pension plans
Net unrealized gain (loss) on energy derivative instruments
 
Changes in AOCI, net of tax
 
(Dollars in Thousands)
Total
Balance at March 31, 2013
$
(2,168
)
$
(28,718
)
$
(849
)
$
(31,735
)
Other comprehensive income (loss) before reclassifications
—

(1,548
)
—

(1,548
)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax
861

441

—

1,302

Net current-period other comprehensive income (loss)
861

(1,107
)
—

(246
)
Balance at June 30, 2013
$
(1,307
)
$
(29,825
)
$
(849
)
$
(31,981
)
Puget Energy
Net unrealized gain (loss) on interest rate swaps
Net unrealized gain (loss) and prior service cost on pension plans
Net unrealized gain (loss) on energy derivative instruments
 
Changes in AOCI, net of tax
 
(Dollars in Thousands)
Total
Balance at December 31, 2012
$
(3,022
)
$
(29,065
)
$
(742
)
$
(32,829
)
Other comprehensive income (loss) before reclassifications
—

(1,548
)
—

(1,548
)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax
1,715

788

(107
)
2,396

Net current-period other comprehensive income (loss)
1,715

(760
)
(107
)
848

Balance at June 30, 2013
$
(1,307
)
$
(29,825
)
$
(849
)
$
(31,981
)
Reclassification out of Accumulated Other Comprehensive Income  
Details about these reclassifications out of accumulated other comprehensive income (loss) for the six months ended June 30, 2013 are as follows:
Puget Energy
 
 
(Dollars in Thousands)
 
 
Details about accumulated other comprehensive income (loss) components
Amount reclassified from accumulated other comprehensive income (loss)
Affected line item in the statement where net income (loss) is presented
Net unrealized gain (loss) on interest rate swaps

 
Interest rate contracts
$
(2,639
)
Interest expense

924

Tax (expense) or benefit

$
(1,715
)
Net of Tax
Net unrealized gain (loss) and prior service cost on pension plans


 
Amortization of prior service cost
999

1 
Amortization of net gain (loss)
(2,209
)
1 

(1,210
)
Total before tax

422

Tax (expense) or benefit

$
(788
)
Net of Tax
Net unrealized gain (loss) on energy derivative instruments


 
Commodity contracts: electric derivatives
164

Purchased electricity

(57
)
Tax (expense) or benefit

$
107

Net of Tax
Total reclassification for the period
$
(2,396
)
Net of Tax
__________
1 These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 5 for additional details).
Subsidiaries [Member]
    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Schedule of Accumulated Other Comprehensive Income (Loss)  
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 March 31, 2013
$
(172,612
)
$
(2,765
)
$
(6,545
)
$
(181,922
)
Other comprehensive income (loss) before reclassifications
(1,548
)
—

—

(1,548
)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax
3,427

—

79

3,506

Net current-period other comprehensive income (loss)
1,879

—

79

1,958

Balance at June 30, 2013
$
(170,733
)
$
(2,765
)
$
(6,466
)
$
(179,964
)
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, 2012
$
(175,998
)
$
(4,576
)
$
(6,624
)
$
(187,198
)
Other comprehensive income (loss) before reclassifications
(1,548
)
—

—

(1,548
)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax
6,813

1,811

158

8,782

Net current-period other comprehensive income (loss)
5,265

1,811

158

7,234

Balance at June 30, 2013
$
(170,733
)
$
(2,765
)
$
(6,466
)
$
(179,964
)
Reclassification out of Accumulated Other Comprehensive Income
Details about these reclassifications out of accumulated other comprehensive income (loss) for the three months ended June 30, 2013 are as follows:
Puget Energy
 
 
(Dollars in Thousands)
 
 
Details about accumulated other comprehensive income (loss) components
Amount reclassified from accumulated other comprehensive income (loss)
Affected line item in the statement where net income (loss) is presented
Net unrealized gain (loss) on interest rate swaps

 
Interest rate contracts
$
(1,325
)
Interest expense
 
464

Tax (expense) or benefit
 
$
(861
)
Net of Tax
Net unrealized gain (loss) and prior service cost on pension plans


 
Amortization of prior service cost
499

1 
Amortization of net gain (loss)
(1,177
)
1 
 
(678
)
Total before tax
 
237

Tax (expense) or benefit
 
$
(441
)
Net of Tax
Net unrealized gain (loss) on energy derivative instruments


 
Commodity contracts: electric derivatives
—

Purchased electricity
 
—

Tax (expense) or benefit
 
$
—

Net of Tax
Total reclassification for the period
$
(1,302
)
Net of Tax
__________
1 These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 5 for additional details).

Puget Sound Energy
 
 
(Dollars in Thousands)
 
 
Details about accumulated other comprehensive income (loss) components
Amount reclassified from accumulated other comprehensive income (loss)
Affected line item in the statement where net income (loss) is presented
Net unrealized gain (loss) and prior service cost on pension plans
 
 
Amortization of prior service cost
$
389

1 
Amortization of net gain (loss)
(5,661
)
1 
 
(5,272
)
Total before tax
 
1,845

Tax (expense) or benefit
 
$
(3,427
)
Net of Tax
Net unrealized gain (loss) on energy derivative instruments
 
 
Commodity contracts: electric derivatives
—

Purchased electricity
 
—

Tax (expense) or benefit
 
$
—

Net of Tax
Net unrealized gain (loss) on treasury interest rate swaps


 
Interest rate contracts
(122
)
Interest expense
 
43

Tax (expense) or benefit
 
$
(79
)
Net of Tax
Total reclassification for the period
$
(3,506
)
Net of Tax
__________
1 These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 5 for additional details).
Puget Sound Energy
 
 
(Dollars in Thousands)
 
 
Details about accumulated other comprehensive income (loss) components
Amount reclassified from accumulated other comprehensive income (loss)
Affected line item in the statement where net income (loss) is presented
Net unrealized gain (loss) and prior service cost on pension plans


 
Amortization of prior service cost
$
781

1 
Amortization of net gain (loss)
(11,260
)
1 

(10,479
)
Total before tax

3,666

Tax (expense) or benefit

$
(6,813
)
Net of Tax
Net unrealized gain (loss) on energy derivative instruments


 
Commodity contracts: electric derivatives
(2,786
)
Purchased electricity

975

Tax (expense) or benefit

$
(1,811
)
Net of Tax
Net unrealized gain (loss) on treasury interest rate swaps


 
Interest rate contracts
(244
)
Interest expense

86

Tax (expense) or benefit

$
(158
)
Net of Tax
Total reclassification for the period
$
(8,782
)
Net of Tax
__________
1 These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 5 for additional details).
Parent [Member]
    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Reclassification out of Accumulated Other Comprehensive Income
Details about these reclassifications out of accumulated other comprehensive income (loss) for the three months ended June 30, 2013 are as follows:
Puget Energy
 
 
(Dollars in Thousands)
 
 
Details about accumulated other comprehensive income (loss) components
Amount reclassified from accumulated other comprehensive income (loss)
Affected line item in the statement where net income (loss) is presented
Net unrealized gain (loss) on interest rate swaps

 
Interest rate contracts
$
(1,325
)
Interest expense
 
464

Tax (expense) or benefit
 
$
(861
)
Net of Tax
Net unrealized gain (loss) and prior service cost on pension plans


 
Amortization of prior service cost
499

1 
Amortization of net gain (loss)
(1,177
)
1 
 
(678
)
Total before tax
 
237

Tax (expense) or benefit
 
$
(441
)
Net of Tax
Net unrealized gain (loss) on energy derivative instruments


 
Commodity contracts: electric derivatives
—

Purchased electricity
 
—

Tax (expense) or benefit
 
$
—

Net of Tax
Total reclassification for the period
$
(1,302
)
Net of Tax
__________
1 These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 5 for additional details)