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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2014
Entity Information [Line Items]  
Reclassification, Policy [Policy Text Block]
The Company revised its Consolidated Statement of Cash Flows due to an immaterial error. Revisions were made in the second quarter ended June 30, 2013 on the Company's Consolidated Statement of Cash Flows to reflect energy efficiency expenditures as operating cash outflows instead of investing cash outflows. The Company determined energy efficiency expenditures should have been classified as operating activities instead of investing activities. These revisions decreased net cash provided by operating activities and decreased net cash used by investing activities. The revision does not affect the net change in cash and cash equivalents for any of the periods, and has no effect on the Company's Consolidated Statements of Income, Consolidated Statements of Comprehensive Income, Consolidated Balance Sheets, and Consolidated Statement of Common Shareholder's Equity. The Company has evaluated the effects of these errors and concluded that none of them are material to any of the Company's previously issued quarterly or annual Financial Statements. Nevertheless, the Company elected to revise the Consolidated Statement of Cash Flows in this report to correct for the effect of these errors and properly reflect the revised values.
 
The amounts on prior period Consolidated Statements of Cash Flows which have been revised are summarized below:
 
As Reported
 
As Revised
Puget Energy
Three Months Ended
 
Three Months Ended
(Dollars in Thousands)
March 31, 2013
 
March 31, 2013
Operating Activities:
 
 
 
Regulatory Assets
$
(6,411
)
 
$
(28,953
)
Net Cash Provided by Operating Activities
$
323,807

 
$
301,265

Investing Activities:
 
 
 
Energy Efficiency Expenditures
$
(22,542
)
 
$
—

Net Cash Used in Investing Activities
$
(86,362
)
 
$
(63,820
)

 
As Reported
 
As Revised
Puget Sound Energy
Three Months Ended
 
Three Months Ended
(Dollars in Thousands)
March 31, 2013
 
March 31, 2013
Operating Activities:
 
 
 
Regulatory Assets
$
(6,411
)
 
$
(28,953
)
Net Cash Provided by Operating Activities
$
332,243

 
$
309,701

Investing Activities:
 
 
 
Energy Efficiency Expenditures
$
(22,542
)
 
$
—

Net Cash Used in Investing Activities
$
(86,298
)
 
$
(63,756
)