Fair Value Measurements Carrying Value (Details) (Carrying Value [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
PUGET ENERGY [Member]
Assets:
Cash and Cash Equivalents	$ 23,581	$ 44,302
Restricted Cash	25,437	7,171
Notes Receivable and Other	54,542	53,449
Total assets	103,560	104,922
Liabilities:
Short-term Debt	0	162,000
Total liabilities	0	162,000
PUGET ENERGY [Member] | Level 1 [Member]
Assets:
Cash and Cash Equivalents	23,581	44,302
Restricted Cash	25,437	7,171
Notes Receivable and Other	0	0
Total assets	49,018	51,473
Liabilities:
Short-term Debt	0	162,000
Total liabilities	0	162,000
PUGET ENERGY [Member] | Level 2 [Member]
Assets:
Cash and Cash Equivalents	0	0
Restricted Cash	0	0
Notes Receivable and Other	54,542	53,449
Total assets	54,542	53,449
Liabilities:
Short-term Debt	0	0
Total liabilities	0	0
Subsidiaries [Member]
Assets:
Cash and Cash Equivalents	23,556	44,111
Restricted Cash	25,437	7,171
Notes Receivable and Other	54,542	53,449
Total assets	103,535	104,731
Liabilities:
Short-term Debt	0	162,000
Short-term Debt owed by PSE to PE	29,598	29,598
Total liabilities	29,598	191,598
Subsidiaries [Member] | Level 1 [Member]
Assets:
Cash and Cash Equivalents	23,556	44,111
Restricted Cash	25,437	7,171
Notes Receivable and Other	0	0
Total assets	48,993	51,282
Liabilities:
Short-term Debt	0	162,000
Short-term Debt owed by PSE to PE	0	0
Total liabilities	0	162,000
Subsidiaries [Member] | Level 2 [Member]
Assets:
Cash and Cash Equivalents	0	0
Restricted Cash	0	0
Notes Receivable and Other	54,542	53,449
Total assets	54,542	53,449
Liabilities:
Short-term Debt	0	0
Short-term Debt owed by PSE to PE	29,598	29,598
Total liabilities	$ 29,598	$ 29,598