UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF

THE SECURITIES EXCHANGE ACT OF 1934

Date of report (Date of earliest event reported): February 4, 2013

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

On February 4, 2013, Puget Sound Energy, Inc. (“PSE”) entered into a Credit Agreement providing for credit facilities (collectively, the “PSE Facility”) with Wells Fargo Bank, National Association, as Administrative Agent, the lenders party thereto, the issuing banks party thereto, The Royal Bank of Scotland PLC, as Syndication Agent, Bank of America, N.A., Barclays Bank PLC, CoBank, ACB, Export Development Canada, and JPMorgan Chase Bank, N.A., as Co-Documentation Agents, and Wells Fargo Securities, LLC, RBS Securities Inc., Barclays Bank PLC, CoBank, ACB, Export Development Canada, J.P. Morgan Securities LLC, and Merrill Lynch, Pierce, Fenner & Smith Incorporated, as Joint Lead Arrangers and Joint Bookrunners, to provide debt financing in the form of (i) a revolving liquidity facility (which includes a liquidity letter of credit facility and a swingline facility) in an aggregate amount at any one time outstanding not to exceed $650 million, (ii) a revolving energy hedging facility (which includes an energy hedging letter of credit facility) in an aggregate amount at any one time outstanding not to exceed $350 million. As of the closing date of the PSE Facility, there were no amounts outstanding and there was one letter of credit outstanding. Proceeds of the PSE Facility may be used as follows: (a) the revolving liquidity facility, swingline facility and liquidity letter of credit facility to (i) refinance certain indebtedness of PSE, (ii) pay fees, commissions and expenses in connection with the PSE Facility, (iii) finance ongoing working capital requirements and other general corporate purposes and (iv) support the energy purchases and hedging activities of PSE to the extent there is not availability under revolving energy hedging facility, and (b) the revolving energy hedging facility and energy hedging letter of credit facility to (i) support the energy purchases and hedging activities of PSE and (ii) finance ongoing working capital requirements and other general corporate purposes to the extent there is not availability under revolving liquidity facility.

The final maturity date under the PSE Facility is February 4, 2018. The terms and conditions of the PSE Facility include the following:

The PSE Facility also contains certain customary representations and warranties, affirmative and negative covenants and events of default, as well as, in the event of an occurrence of an “Event of Default,” customary remedies for the lenders to accelerate any amounts outstanding under the PSE Facility. Additionally, the PSE Facility includes certain customary conditions that must be met for PSE to borrow or request to be issued letters of credit under the PSE Facility.

The foregoing description of the PSE Facility is only a summary and does not purport to be complete. A copy of the PSE Facility is attached hereto as Exhibit 10.1 and incorporated herein by reference.

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In connection with the entry into the PSE Facility, on February 4, 2013, the PSE credit facility provided for in the following Credit Agreement was paid in full and terminated:

The information set forth in Item 1.01 is incorporated herein by reference.

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrants have duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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INDEX TO EXHIBITS

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