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Related Party Transactions
 12 Months Ended
Dec. 31, 2012
Related Party Transactions [Abstract]  
Related Party Transactions
Related Party Transactions

On June 1, 2006, PSE entered into a revolving credit facility with Puget Energy in the form of a Demand Promissory Note (Note).  Through the Note, PSE may borrow up to $30.0 million from Puget Energy, subject to approval by Puget Energy.  Under the terms of the Note, PSE pays interest on the outstanding borrowings based on the lowest of the weighted-average interest rate of PSE’s outstanding commercial paper interest rate or PSE’s senior unsecured revolving credit facility.  Absent such borrowings, interest is charged at one-month LIBOR plus 0.25%.  At December 31, 2012 and 2011, the outstanding balance of the Note was $29.6 million and $30.0 million, respectively, and the interest rate was 0.5% and 1.6%, respectively.  The outstanding balance and the related interest under the Note are eliminated by Puget Energy upon consolidation of PSE’s financial statements.  The $30.0 million credit facility with Puget Energy was unaffected by the merger.
On June 3, 2011, Puget Energy issued $500.0 million of senior secured notes.  Macquarie Capital (USA) Inc. acted as a co-manager and underwriter of this issue.  Net proceeds of $484.0 million from these notes were used to repay a portion of the outstanding $782.0 million term-loan.  Puget Energy’s term-loan and credit facility for funding capital expenditures both were originally scheduled to mature in February 2014, and were syndicated among numerous committed banks and other financial institutions.  One of these banks was Macquarie Bank Limited. On February 10, 2012, Puget Energy terminated the term loan and capital expenditure facility and replaced them with a $1.0 billion revolving credit facility. There are no related parties with commitments under the $1.0 billion revolving credit facility.  Concurrent with the borrowings under the term loan and capital expenditure credit agreements, Puget Energy entered into several interest rate swap instruments to hedge volatility associated with these two loans.  Two of the swap instruments were entered into with Macquarie Bank Limited with a total notional amount of $444.9 million.  On June 3, 2011 Puget Energy settled one of the swaps with a notional amount of $77.4 million. On February 9, 2012, Puget Energy amended and reduced the remaining swap instrument by $67.5 million. On June 18, 2012, Puget Energy terminated and settled the remaining $300.0 million of the swap instrument with Macquarie Bank Limited.