SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) (Allowance for doubtful accounts receivable, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning of Period	$ 7,385	$ 9,932	$ 8,495
Additions Charged to Costs and Expenses	27,228	26,330	21,567
Deductions	27,141	28,877	20,130
Balance At End Of Period	7,472	7,385	9,932
PUGET SOUND ENERGY, INC.
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning of Period	7,385	9,932	8,495
Additions Charged to Costs and Expenses	27,228	26,330	21,567
Deductions	27,141	28,877	20,130
Balance At End Of Period	$ 7,472	$ 7,385	$ 9,932