(Real Estate Mortgage) PUGET SOUND ENERGY, INC. TO U.S. Bank National Association, Trustee _______________ Eighty-Eighth Supplemental Indenture Dated as of April28, 2010 _______________ Relating to First Mortgage Bonds _______________ Supplemental to Indenture dated as of June 2, 1924, as supplemented and modified _______________ (NOT PART OF INDENTURE)

THIS EIGHTY-EIGHTH SUPPLEMENTAL INDENTURE, made as of the 28th day of April, 2010, by and between Puget Sound Energy, Inc., formerly Puget Sound Power & Light Company, a corporation duly organized and existing under and by virtue of the laws of the State of Washington (hereinafter sometimes called the “Company”), party of the first part, and U.S. Bank National Association, a national banking association with a principal corporate trust office at 100 Wall Street, Suite 1600, in the city of New York and State of New York 10005 (successor to Old Colony Trust Company) (hereinafter sometimes called the “Trustee”), as Trustee under the First Mortgage (originally, and before modification thereof by certain supplemental indentures, called “First and Refunding Mortgage”) from Puget Sound Power & Light Company, a Massachusetts corporation (hereinafter sometimes called the “Predecessor Company”), dated as of June 2, 1924 (said Mortgage being hereinafter sometimes called the “Original Mortgage”), as supplemented and modified by all indentures supplemental thereto heretofore executed and delivered, party of the second part;

WITNESSETH: that

WHEREAS, the Predecessor Company did by the Original Mortgage, filed for record in the offices of the Auditors of the Counties of Chelan, Clallam, Cowlitz, Douglas, Grant, Grays Harbor, Island, Jefferson, King, Kitsap, Kittitas, Lewis, Mason, Pacific, Pierce, Skagit, Snohomish, Thurston and Whatcom, all in the State of Washington, and left on file as a chattel mortgage in each of said counties, convey and pledge certain property therein described to Old Colony Trust Company, as Trustee, to be held upon the trusts expressed in the Original Mortgage to equally secure an unlimited authorized amount of mortgage bonds (therein and herein called the “Bonds”) issued or to be issued in one or more series, all as more fully provided in the Original Mortgage; and

WHEREAS, the Predecessor Company, prior to September 1, 1954, had executed and delivered to the Trustee thirty-nine supplemental indentures, supplementing and in certain respects modifying the Original Mortgage and providing for the execution, certification and delivery of Bonds of various series from time to time pursuant thereto (which Original Mortgage, as so supplemented and modified, is therein and herein sometimes called the “First Mortgage”); and

WHEREAS, the Predecessor Company executed and delivered to the Trustee a Fortieth Supplemental Indenture, dated as of September 1, 1954, which Supplemental Indenture is divided into two parts, designated as Part I and Part II, and Part I thereof provided for the establishment and the execution, certification and delivery initially of Twenty-Five Million Dollars ($25,000,000) principal amount of a series of Bonds, designated as First Mortgage Bonds, 3-1/2% Series due 1984, and contained certain covenants, restrictions, conditions and provisions affecting, and provided for certain modifications of, the First Mortgage (the First Mortgage, as so supplemented and modified by said Part I, being sometimes in said Fortieth Supplemental Indenture and herein called the “Revised First Mortgage”) and Part II thereof provided for modifications of the Revised First Mortgage as therein set forth, which modifications became effective on October 20, 1955 (the Revised First Mortgage as so modified by Part II of the Fortieth Supplemental Indenture as heretofore, hereby, and hereafter supplemented and modified being sometimes in said Part II and herein called the “Indenture” and references herein to Sections, Articles or other provisions of the Indenture being to the revised or modified provisions thereof as set forth in Part II of the Fortieth Supplemental Indenture); and

WHEREAS, the Predecessor Company has heretofore executed and delivered to the Trustee a Forty-First Supplemental Indenture dated as of December 1, 1954, a Forty-Second Supplemental Indenture dated as of July 1, 1957, a Forty-Third Supplemental Indenture dated as of May 1, 1958, a Forty-Fourth Supplemental Indenture dated as of November l, 1959, and a Forty-Fifth Supplemental Indenture dated as of April 1, 1960, all of which mortgaged, pledged, assigned, conveyed and

transferred to the Trustee and subjected to the lien of the Indenture additional property acquired or constructed, and betterments, improvements and additions made to the mortgaged property, since the execution and delivery of the Fortieth Supplemental Indenture; and

WHEREAS, the Company has executed and delivered to the Trustee a Forty-Sixth Supplemental Indenture dated as of November 10, 1960, whereby the Company has succeeded to the Predecessor Company with the same effect as if the Company had been named in the Indenture as the mortgagor company and in the Bonds and coupons as the obligor thereon or maker thereof, and the Predecessor Company merged into the Company on November 16, 1960, whereupon the Company acquired all the property, real, personal or mixed, including all rights, privileges, easements, licenses and franchises, described in the Indenture and thereby conveyed and mortgaged or intended so to be, including also all such property acquired by the Predecessor Company since the execution and delivery of the Original Mortgage, which by the terms of the Indenture is subjected or intended to be subjected to the lien thereof; and

WHEREAS, the Company has executed and delivered to the Trustee the supplemental indentures set forth herein:

all of which mortgaged, pledged, assigned, conveyed and transferred to the Trustee and subjected to the lien of the Indenture additional property acquired or constructed, and betterments, improvements and additions made to the mortgaged property since the execution and delivery of the Fortieth Supplemental Indenture; and

WHEREAS, all Bonds of any series heretofore executed, authenticated and delivered pursuant to the Original Mortgage, as from time to time supplemented and modified, have been retired and

canceled or payment duly and irrevocably provided for, except for the series set forth herein:

which Bonds are now outstanding and constitute the only Bonds of the Company outstanding under the Indenture; and

WHEREAS, effective as of the opening of business on January 4, 1971, The First National Bank of Boston succeeded Old Colony Trust Company as Trustee under the Indenture by reason of the merger of Old Colony Trust Company into The First National Bank of Boston; and

WHEREAS, effective as of October 2, 1995, State Street Bank and Trust Company succeeded The First National Bank of Boston as Trustee under the Indenture; and

WHEREAS, effective as of February 15, 2003, U.S. Bank National Association succeeded State Street Bank and Trust Company as Trustee under the Indenture; and

WHEREAS, the Company has entered into an Indenture (the “Debenture Indenture”) dated as of December 1, 1997 with U.S. Bank National Association (as successor to State Street Bank and Trust Company) as trustee (in such capacity, the “Debenture Indenture Trustee”) pursuant to which the Company proposes to issue from time to time its Senior Notes (the “Senior Notes”) and the Company has agreed to make certain payments to the Debenture Indenture Trustee in respect of the principal of, premium, if any, and interest on such Senior Notes; and

WHEREAS, the Company desires to execute and deliver this Eighty-Eighth Supplemental Indenture, in accordance with the provisions of the Indenture, for the purpose of confirming the lien of

the Indenture on certain property acquired or constructed by the Company since the execution and delivery of the Original Mortgage and on certain betterments, improvements and additions made by the Company to property previously described in the Indenture.

NOW, THEREFORE, WITNESSETH, that, pursuant to and in execution of the powers, authorities and obligations conferred, imposed and reserved in the Indenture, and pursuant to and in execution of every other power, authority and obligation thereto appertaining and/or enabling, in order to secure the payment of the principal of, and the premium, if any, and interest on, the Bonds issued and to be issued under the Indenture, and secured thereby and hereby at any time outstanding according to their tenor and effect, and the performance of all the covenants and conditions therein and herein and in said Bonds contained, and for the purpose of confirming the lien of the Indenture, said Puget Sound Energy, Inc., organized and existing under the laws of the State of Washington, in consideration of the premises and of One Dollar ($1.00) and other good and valuable consideration to it duly paid by the Trustee, at or before the execution and delivery of these presents, the receipt whereof is hereby acknowledged, has granted, bargained, sold, conveyed, transferred, assigned, remised, released, mortgaged, set over and confirmed and by these presents does grant, bargain, sell, convey, transfer, assign, remise, release, mortgage, set over and confirm unto U.S. Bank National Association, as Trustee, and to its successor or successors in the trust created by the Indenture, and to said Trustee and its assigns forever, for the uses and purposes created by the Indenture, all property, real, personal or mixed, including all rights, privileges, easements, licenses and franchises, described in the Indenture and thereby conveyed and mortgaged or intended so to be, including also all such property acquired by the Company since the execution and delivery of the Original Mortgage, which by the terms of the Indenture is subjected or intended to be subjected to the lien thereof, and including also all such property as the Company may hereafter acquire which by the terms of the Indenture is subjected or intended to be subjected to the lien thereof, excepting from the foregoing, however, all property included within the foregoing general description, whether now owned or hereafter acquired, which by the provisions of the Indenture is excepted or to be excepted from the conveyance and lien of the Indenture, or which has heretofore been released from the lien of the Indenture or otherwise disposed of by the Company free from the lien of the Indenture in accordance with the provisions thereof:

INCLUDING NEVERTHELESS in the property hereby conveyed and confirmed to the Trustee (without limiting the generality of the foregoing general description of such property and without prejudice to the conveyance and confirmance of all such property by such general description) the following:

All property, real, personal or mixed, together with all buildings or improvements thereon and the appurtenances thereto, located in the State of Washington and described below or conveyed to the Company by the deeds listed on the list of properties and deeds below, to which deeds and the records thereof in the County Auditor's office of the respective counties in the State of Washington below stated (in all cases where said deeds and/or records are below specified) reference is hereby made for a more particular description of the property hereby conveyed and confirmed to the Trustee and its respective successor or successors and assigns as aforesaid, to wit:

Description:

All of Section 8;

The North Half (N½) of Section 17;

The Southwest Quarter (SW¼) of Section 9; the Southwest Quarter of the Northwest Quarter (SW¼NW¼) of Section 9; the West Half of the Southeast Quarter (W½SE¼) of Section 9; and the Southeast Quarter of the Southeast Quarter (SE¼SE¼) of Section 9;

The South Half of the South Half of the North Half (S½S½N½) of Section 15; and

The Southwest Quarter of the Southwest Quarter (SW¼SW¼) of Section 23

All in Township 18 North, Range 21 East, W.M., in the County of Kittitas, State of Washington

Deed From:    American Minerals and Land Corporation, and Land Development and Promotion Services, Inc.

Deed Records

Auditors File No.:    200802120021

Parcel ID#:    1821080000001, 1821170000001, 1821090000007, 1821150000001 & 1821230000001

** All numbers in the row following the designation "Township," indicate townships north of the Willamette Base Line, and the Letters "E" and "W" in the row following the designation "Range," indicate east or west, as the case may be, of the Willamette Meridian.

Description:    

Parcel BP-7, Redmond Ridge Division 8, a Master Plat, According to the Plat thereof, Recorded in Volume 208 of Plats, Pages 68 through 90, in the Records of King County, Washington

Deed From:    M&T Partners, Inc

Deed Records

Auditors File No.:    20090630002506

Parcel ID#:     ###-###-####

** All numbers in the row following the designation "Township," indicate townships north of the Willamette Base Line, and the Letters "E" and "W" in the row following the designation "Range," indicate east or west, as the case may be, of the Willamette Meridian.

Description:    

Lot C, as delineated on the face of Amended G.C. Lot Line Adjustment No. 1, according to the plat thereof, recorded August 5, 2003, under Whatcom County Auditor's File No. 2030800919, records of Whatcom County, Washington.

Deed From:    Gene and Virginia Crabtree Real Estate L.L.C.

Deed Records

Auditors File No.:    2071202838

Parcel ID#:    400224 ###-###-####

** All numbers in the row following the designation "Township," indicate townships north of the Willamette Base Line, and the Letters "E" and "W" in the row following the designation "Range," indicate east or west, as the case may be, of the Willamette Meridian.

Description:    

That portion of the southwest quarter of the southeast quarter of Section 22, Township 25 North, Range 5 East, W.M., in King County, Washington, described as follows:

Commencing at the Southwest Corner of said subdivision;

Thence South 88°16'05" East along the South line thereof 242.00 Feet;

Thence North 1°38'12" East parallel with the West line of said subdivision 30.00 feet to the intersection with the North margin of N.E. 24th Street and the true point of beginning;

Then North 88°16'05" West along said North margin 175.05 feet to the point of curvature of a 25 foor radius curve to the right;

Thence along said curve 39.23 feet to a point of tangency on the East line of the West 42 feet of said subdivision;

Thence North 1°38'12" East along said East line 175.05 feet;

Thence South 88°16'05" East 200.00 feet;

Thence South 1°38'12" West 200.00 feet to the true point of beginning.

Excepting therefrom those portions of the above described property as conveyed to the City of Bellevue by instruments recorded under King County recording numbers 9010151111 and 20030205002190.

Deed From:    Equilon Enterprises LLC

Deed Records

Auditors File No.:    20091030001202

Parcel ID#:     ###-###-####-04

That portion of the north half of the northeast quarter of the northwest quarter of Section 26, Township 25 North, Range 5 East, W.M., in King County, Washington, described as follows:

Commencing at the north quarter corner of said Section 26;

Thence south 88°10'50" west along the north line of said Section 26, a distance of 469.64 feet;

Thence south 1°49'10" east 30 feet, said point being the intersection of the westerly margin of N.E. Redmond-Bellevue Road and the southerly margin of N.E. 24^th Street;

Thence south 88°10'50" west along said southerly margin of N.E. 24^th Street, a distance of 162.00 feet to the TRUE POINT OF BEGINNING;

Thence south 19°41'30" west 149.75 feet;

Thence north 88°10'50" east 162.00 feet to a point on the westerly margin of said N.E. Redmond-Bellevue Road, said point being on a curve to the left whose radius point bears south 76°03'59" east a radius distance of 746.34 feet;

Thence southerly along said westerly margin an arc distance of 101.80 feet to a point of tangency;

Thence south 6°07'06" west along said westerly margin of N.E. Redmond-Bellevue Road for a distance of 55.42 feet to an intersection with the north line of the south 348.64 feet of said north half of the northeast quarter of the northwest quarter;

Thence south 88°29'43" west along said north line for a distance of 321.16 feet;

Thence north 16°18'29" east 307.25 feet, more or less, to an intersection with the south line of the north 30 feet of said north half of the northeast quarter of the northwest quarter, said point being on the southerly margin of N.E. 24^th Street and 147.00 feet westerly of the TRUE POINT OF BEGINNING;

Thence north 88°10'50" east along said southerly margin for a distance 147.00 feet to the TRUE POINT OF BEGINNING;

EXCEPT that portion conveyed to the City of Redmond by Deed recorded under Recording Number ###-###-####.

Deed From:    Bank of America NA

Deed Records

Auditors File No.:    20091231001724

Parcel ID#:     ###-###-####-07

This Eighty-Eighth Supplemental Indenture is executed and shall be construed as an indenture supplemental to the Indenture, and shall form a part thereof, and the Indenture, as hereby supplemented and modified, is hereby confirmed. Except to the extent inconsistent with the express terms hereof, all the provisions, terms, covenants, and conditions of the Indenture shall be applicable to the Bonds of the New Series to the same extent as if specifically set forth herein.

The Trustee has accepted the amendment of the Indenture effected by this Eighty-Eighth Supplemental Indenture and agrees to execute the trust created by the Indenture as hereby amended, but only upon the terms and conditions set forth in the Indenture, including the terms and provisions defining and limiting the liabilities and responsibilities of the Trustee, and without limiting the generality of the foregoing, the Trustee shall not be responsible in any manner whatsoever for or with respect of any of the recitals or statements contained herein, all of which recitals or statements are made solely by the Company, or for or with respect to (a) the validity or sufficiency of this Eighty-Eighth Supplemental Indenture or any of the terms or provisions hereof, (b) the proper authorization hereof by the Company by corporate action or otherwise, and (c) the due execution hereof by the Company.

The Company covenants that it is lawfully seized and possessed of all the trust estate at the date of the execution of the Eighty-Eighth Supplemental Indenture except as in the Indenture otherwise stated or permitted; that on said date the trust estate is free and clear from all liens and encumbrances other than permitted encumbrances, except as in the Indenture otherwise stated or permitted; that the Company will warrant and forever defend the trust estate and the title thereto to the Trustee against the claims of all persons whomsoever except as in the Indenture otherwise stated or permitted; that it will maintain and preserve the lien of the Indenture, as a first mortgage lien, except as in the Indenture otherwise stated or permitted so long as any of the Bonds issued under the Indenture are outstanding; and that it has good right and lawful authority to subject said property to the lien of the Indenture, as provided in and by the Indenture.

This Eighty-Eighth Supplemental Indenture may be executed in several counterparts, and each of such counterparts shall for all purposes be deemed to be an original, and all such counterparts, or as many of them as the Company and the Trustee shall preserve undestroyed, shall together constitute but one and the same instrument.

Although this Eighty-Eighth Supplemental Indenture is dated for convenience and for the purpose of reference as of April 28, 2010, the actual date or dates of execution by the Company and by the Trustee are as indicated by their respective acknowledgments hereto annexed.            [The remainder of this page intentionally left blank]

IN WITNESS WHEREOF, Puget Sound Energy, Inc. has caused this Eighty-Eighth Supplemental Indenture to be signed in its corporate name and behalf by its President or one of its Vice Presidents and the Treasurer or an Assistant Treasurer or the Secretary or an Assistant Secretary, all on April 28, 2010, but as of the day and year first above written.

PUGET SOUND ENERGY, INC.

By        

Donald E. Gaines

Vice President Finance and Treasurer

Attest:

                    

James D. Sant

    

    

STATE OF WASHINGTON    )

) ss:

COUNTY OF KING        )

On this ______ day of ______________, 2010, before me, a Notary Public in and for the State of Washington, duly commissioned and sworn, personally appeared Donald E. Gaines, to me known to be the Vice President Finance and Treasurer of Puget Sound Energy, Inc., a Washington corporation, the corporation named in and which executed the foregoing instrument; and he acknowledged to me that he signed the same as the free and voluntary act and deed of said corporation for the uses and purposes therein mentioned, being authorized so to do.

WITNESS my hand and official seal the day and year in this certificate above written.

____________________________________

Notary Name:             

Notary Public in and for the State of

____________, residing at ________________.

My commission expires ____________.

STATE OF WASHINGTON    )

) ss:

COUNTY OF KING        )

On this ______ day of ______________, 2010, before me, a Notary Public in and for the State of Washington, duly commissioned and sworn, personally appeared James D. Sant, to me known to be the Assistant Treasurer of Puget Sound Energy, Inc., a Washington corporation, the corporation named in and which executed the foregoing instrument; and he acknowledged to me that he signed the same as the free and voluntary act and deed of said corporation for the uses and purposes therein mentioned, being authorized so to do.

WITNESS my hand and official seal the day and year in this certificate above written.

____________________________________

Notary Name:             

Notary Public in and for the State of

____________, residing at ________________.

My commission expires ____________.