Document:

Twenty-seventh Supplemental Indenture

 EXHIBIT 4.12 
 SECURITY AGREEMENT 
 This is a Security Agreement covering personal property 
 as well as other property real and/or personal 
 WASHINGTON NATURAL GAS COMPANY 
 TO 
 HARRIS TRUST AND SAVINGS BANK, 
                                        
             TRUSTEE 
 AND 
 R.G. MASON, 
                                     CO-TRUSTEE 

 
  
 TWENTY-SEVENTH SUPPLEMENTAL INDENTURE 
 Dated as of September 1, 1990

 SUPPLEMENTING 
 INDENTURE OF FIRST MORTGAGE 
 Dated as of April 1, 1957 

 SECURITY AGREEMENT 
 This is a Security Agreement covering personal property as well as other property real and/or personal. 
 TWENTY-SEVENTH SUPPLEMENTAL INDENTURE dated as of September 1, 1990 (hereinafter called the “Twenty-seventh Supplemental Indenture”) and made by and between WASHINGTON NATURAL GAS COMPANY, as Debtor (its Federal
identification number being 91-1005303), a corporation organized and existing under the laws of the State of Washington (the “Company”), whose mailing address and address of its principal place of business is 815 Mercer Street, Seattle,
Washington 98111, party of the first part, HARRIS TRUST AND SAVINGS BANK, as Trustee and Secured Party (its Federal identification number being 36-1194448), a corporation duly organized and existing under the laws of the State of Illinois and having
its principal place of business at 111 West Monroe Street, Chicago, Illinois 60603 (hereinafter sometimes called the “Trustee”), party of the second part, and R. G. Mason, as Co-Trustee and Secured Party (whose Social Security number
is ###-##-####) and whose residence address is 419 Ames Street, Libertyville, Illinois 60048 (hereinafter sometimes called the “Co-Trustee”), party of the third part, the mailing address of each of whom is P.O. Box 755, Chicago, Illinois
60690 (said Trustee and Co-Trustee being hereinafter sometimes collectively called the “Trustees”). 
 WHEREAS, Washington Natural
Gas Company, a Delaware corporation (the “Predecessor Company”) which was merged into the Company on August 9, 1978, has heretofore executed and delivered to the Trustee its Indenture of First Mortgage dated as of April 1, 1957
(hereinafter called the “Original Indenture” or as heretofore supplemented and modified and as supplemented by this Twenty-seventh Supplemental Indenture hereinafter called the “Indenture”) in order, among other things, to
secure, as provided therein, the payment of the principal of and premium, if any, and interest on its bonds (in the Original Indenture and herein called the “Bonds”) at any time issued and outstanding thereunder according to their tenor
and effect, said Bonds to be designated generally as its “First Mortgage Bonds”, and to be issued in one or more series as provided in the Original Indenture; and 
 WHEREAS, the Predecessor Company has heretofore executed and delivered sixteen indentures supplemental to the Original Indenture as follows: First
Supplemental Indenture, dated as of April 1, 1957, naming and appointing, pursuant to the provisions of Section 15.18 of the Original Indenture, R. H. Long, an individual, to act as Co-Trustee jointly with the Trustee of all or any of
the property subject to the lien of the Original 

  

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Indenture as from time to time supplemented so that, if, by any present or future law in any jurisdiction in which it may be necessary or advisable to
perform any act in the execution of the trusts thereby created, the Trustee shall be incompetent or unqualified to act as such trustee, then all acts so to be performed in such jurisdiction in the execution of the trusts thereby created may be
performed by the Co-Trustee, acting alone, but subject to the provisions and conditions of the Original Indenture, as supplemented and modified, Second Supplemental Indenture dated as of October 1, 1959, Third Supplemental Indenture dated as of
May 1, 1961, Fourth Supplemental Indenture dated as of May 1, 1963, Fifth Supplemental Indenture dated as of June 1, 1965, Sixth Supplemental Indenture dated as of August 1, 1966, Seventh Supplemental Indenture dated as of
February 1, 1967, Eighth Supplemental Indenture dated as of September 1, 1967, Ninth Supplemental Indenture dated as of September 1, 1968, Tenth Supplemental Indenture dated as of June 1, 1970, Eleventh Supplemental Indenture
dated as of April 1, 1971, Twelfth Supplemental Indenture dated as of November 1, 1972, Thirteenth Supplemental Indenture dated as of September 1, 1975, Fourteenth Supplemental Indenture dated as of September 15, 1975, Fifteenth
Supplemental Indenture dated as of March 1, 1977 and Sixteenth Supplemental Indenture dated as of June 1, 1977, naming and appointing, pursuant to the provisions of Section 15.18 of the Original Indenture, R. G. Mason, an individual,
to act as successor Co-Trustee, pursuant to each of which supplemental indentures, except said First, Seventh, and Sixteenth Supplemental Indentures, the Company provided for the creation of an issue of First Mortgage Bonds, and said Sixth and
Seventh Supplemental Indentures provided for certain modifications of the Original Indenture; and 
 WHEREAS, the Company has heretofore
executed and delivered a Seventeenth Supplemental Indenture dated as of August 9, 1978, whereby the Company 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 August 9, 1978 whereupon the Company acquired all the property, real, personal or mixed, including all rights, privileges,
immunities 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 subject or intended to be subjected to the lien thereof; and 
 WHEREAS, the Company has also heretofore
executed and delivered an Eighteenth Supplemental Indenture dated as of September 1, 1979, a Nineteenth Supplemental Indenture dated as of January 15, 1982, a Twentieth Supplemental Indenture dated as 

  

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of August 15, 1983, a Twenty-first Supplemental Indenture dated as of August 15, 1983, a Twenty-second Supplemental Indenture dated as of
July 15, 1986, a Twenty-third Supplemental Indenture dated as of July 15, 1986, a Twenty-fourth Supplemental Indenture dated as of December 15, 1987, a Twenty-fifth Supplemental Indenture dated as of August 15, 1988, and a
Twenty-sixth Supplemental Indenture dated as of September 1, 1990 pursuant to each of which supplemental indentures the Company provided for the creation of an issue of First Mortgage Bonds, and such Twenty-second Supplemental Indenture
provided for certain modifications of the Original Indenture; and 
 WHEREAS, pursuant to the Original Indenture, as heretofore supplemented
and modified, there have been executed, authenticated, delivered and issued and there are now outstanding, First Mortgage Bonds of series and in principal amounts as follows: 
  

							
	 Title
	  	Issued	  	Outstanding
	 6- 1/8% Series due
1991
	  	$	10,000,000	  	$	4,940,000
	 6- 5/8% Series due
1992
	  	 	7,500,000	  	 	4,140,000
	 6- 7/8% Series due
1993
	  	 	7,500,000	  	 	4,300,000
	 12% Series due 1993
	  	 	20,000,000	  	 	15,000,000
	 8- 5/8% Series due
1994
	  	 	20,000,000	  	 	20,000,000
	 10 1/4% Series due
1995
	  	 	15,000,000	  	 	8,790,000
	 9.96% Series due 1995
	  	 	40,000,000	  	 	40,000,000
	 8- 7/8% Series due
1996
	  	 	6,000,000	  	 	3,620,000
	 8.80% Series due 1996
	  	 	25,000,000	  	 	25,000,000
	 8- 1/8% Series due
1997
	  	 	6,000,000	  	 	3,900,000
	 10 1/4% Series due
1997
	  	 	30,000,000	  	 	30,000,000
	 10.40% Series due 1999
	  	 	20,000,000	  	 	11,600,000

 and 
 WHEREAS, the Board of Directors of the Company has established under the Original Indenture, a new series of Bonds 

  

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to be designated First Mortgage Bonds, 9.57% Series due 2020 (hereinafter referred to as the “Bonds of the 2020 Series”), and has authorized the
issue of said Bonds of the 2020 Series in the aggregate principal amount of Twenty-five Million Dollars ($25,000,000) pursuant to the provisions of Article Five of the original Indenture; and 
 WHEREAS, the Board of Directors of the Company has also established under the Original Indenture, a new series of Bonds to be designated First Mortgage
Bonds, 9.60% Series due 2000 (hereinafter referred to as the “Bonds of the 2000 Series”), and has authorized the issue of said Bonds of the 2000 Series in the aggregate principal amount of Twenty-five Million Dollars ($25,000,000) pursuant
to the provisions of Article Five of the Original Indenture (said Bonds of the 2000 Series to be issued pursuant to the terms and conditions of a Twenty-sixth Supplemental Indenture, of even date hereof); and 
 WHEREAS, Section 18.01 of the Original Indenture provides, among other things, that the Company, when authorized by a resolution of the Board of
Directors, and the Trustee, from time to time and at any time, subject to the restrictions in the Indenture contained, may, and when so required by the Original Indenture, shall, enter into indentures supplemental to the Original Indenture and which
thereafter shall form a part thereof, for the purposes, among others, of (a) providing for the creation of a series of Bonds, designating the series to be created and specifying the form and provisions of the Bonds for such series,
(b) adding to the Original Indenture other covenants and agreements thereafter to be observed by the Company, and (c) mortgaging, pledging, conveying, transferring or assigning to the Trustees, and subjecting to the lien of the Indenture,
additional properties acquired by the Company; and 
 WHEREAS, the Board of Directors of the Company, by resolutions duly adopted, authorized
the execution of this Twenty-seventh Supplemental Indenture for the purposes of (a) creating the Bonds of the 2020 Series, designating the series created and specifying the form and provisions of the Bonds of such series, (b) adding to the
Original Indenture certain covenants and agreements hereafter to be observed by the Company, and (c) mortgaging, pledging, conveying, transferring and assigning to the Trustees, and subjecting to the lien of the Indenture, additional properties
acquired by the Company; and 
 WHEREAS, all acts and proceedings required by law and by the Articles of Incorporation and Bylaws of the
Company necessary to secure the payment of the principal of and interest on the Bonds of the 2020 Series, to make the Bonds of the 2020 Series to be issued hereunder, when executed by the Company, authenticated and delivered by the Trustee and duly
issued, the valid, binding and 

  

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legal obligations of the Company, and to constitute the Indenture a valid and binding mortgage for the security of all the Bonds, in accordance with its and
their terms, have been done and taken; and the execution and delivery of this Twenty-seventh Supplemental Indenture and the issue of the Bonds of the 2020 Series have been in all respects duly authorized: 
 NOW, THEREFORE, THIS TWENTY-SEVENTH SUPPLEMENTAL INDENTURE WITNESSETH, that in order to secure the payment of the principal of and premium, if any, and
interest on all Bonds at any time issued and outstanding under the Indenture, according to their tenor, purport and effect, to confirm the lien of the Indenture upon the mortgaged property mentioned therein, including any and all property purchased,
constructed or otherwise acquired by the Company since the date of the Twenty-fifth Supplemental Indenture, and to secure the performance and observance of all the covenants and conditions herein and in the Bonds and in the Indenture contained, and
to declare the terms and conditions upon and subject to which the Bonds of the 2020 Series are and are to be issued and secured, and for and in consideration of the premises and of the mutual covenants herein contained and of the purchase and
acceptance of the Bonds of the 2020 Series by the holders thereof, and of the sum of Ten Dollars ($10) duly paid to the Company by the Trustees, at or before the ensealing and delivery hereof and for other valuable considerations, the receipt
whereof is hereby acknowledged, the Company has executed and delivered this Twenty-seventh Supplemental Indenture, and by these presents, does grant, bargain, sell, alien, remise, release, convey, assign, transfer, mortgage, pledge, set over and
confirm unto the Trustees, their respective successors in trust and its and their successors and assigns, all the property, rights, privileges and franchises (other than excepted property) of the character described in the Granting Clauses of the
Original Indenture now owned of record or otherwise by the Company, whether or not constructed or acquired since the date of the Twenty-fifth Supplemental Indenture or which may hereafter be constructed or acquired by it, and expressly excepting and
excluding from the lien and operation of the Indenture all properties of the character specifically excepted by Paragraphs A through I of Granting Clause IX of the Original Indenture, to the extent contemplated thereby, and all property heretofore
released or otherwise disposed of pursuant to the provisions of the Indenture. 
 TO HAVE AND TO HOLD all of the property, real, personal and
mixed, and all and singular the lands, properties, estates, rights, franchises, privileges and appurtenances hereby granted, bargained, sold, aliened, remised, released, conveyed, assigned, transferred, mortgaged, pledged, set over or confirmed, or
intended so to be, unto the Trustees and their respective 

  

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successors in trust and to its and their successors and assigns, forever. 
 BUT IN TRUST, NEVERTHELESS, for the equal and proportionate use, benefit, security and protection of those who from time to time shall hold the Bonds and coupons, or any of them, authenticated and delivered under the
Indenture, and duly issued by the Company, without any discrimination, preference or priority of any one Bond or coupon over any other by reason of priority in the time of issue, sale or negotiation thereof or otherwise, except as provided in
Section 12.28 of the Original Indenture, so that, subject to said Section 12.28, each and all of said Bonds and coupons shall have the same right, lien and privilege under the Indenture and shall be equally and proportionately secured
thereby and hereby (except as any sinking, renewal or other analogous fund established in accordance with the provisions of the Indenture may afford additional security for the Bonds of any particular series), with the same effect as if all of the
Bonds and coupons had been issued, sold and negotiated simultaneously on the date of the delivery of the Original Indenture. 
 THE COMPANY
HEREBY DECLARES that it holds and will hold and apply all property and rights of the character described in Paragraph G of Granting Clause IX of the Original Indenture as specifically reserved and excepted, upon the trusts as set forth in the
Indenture, and as the Trustees (or any purchaser upon any sale of the mortgaged property) shall for such purpose direct from time to time, to the fullest extent permitted by law or in equity and by any instruments creating the same, as fully as if
the same could be and had been hereby granted, conveyed, mortgaged, pledged, transferred and assigned to and vested in the Trustees. 
 It is
hereby covenanted, declared and agreed by and between the parties hereto that all Bonds and coupons, if any, are to be authenticated, delivered and issued and that all property subject or to become subject to the Indenture is to be held, subject to
the further covenants, conditions, uses and trusts set forth in the Indenture, and the Company for itself and its successor or assigns does hereby covenant and agree to and with the Trustees and their respective successor or successors in such
trust, for the benefit of those who shall hold Bonds, or coupons, or any of them, as follows: 
 ARTICLE ONE 
 BONDS OF THE 2020 SERIES AND PROVISIONS RELATING THERETO 
 Section 1.01. A. Terms of Bonds of the 2020 Series. There shall be, and is hereby created, a new series of Bonds, known as 

  

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and entitled “First Mortgage Bonds, 9.57% Series due 2020” (herein referred to as the “Bonds of the 2020 Series”). The principal amount
of the Bonds of the 2020 Series shall be and hereby is limited, except for duplicate Bonds authenticated and delivered pursuant to Section 3.12 of the Indenture, to Twenty-five Million Dollars ($25,000,000) in aggregate principal amount.

 The definitive Bonds of the 2020 Series shall be issued only as registered Bonds without coupons in the denomination of $1,000 or any
multiple thereof. 
 The definitive Bonds of the 2020 Series may be issued in the form of Bonds engraved, printed or lithographed on steel
engraved borders. 
 The date of the commencement of the first interest period for Bonds of the 2020 Series shall be the date of
authentication and original issuance of the first Bond of the 2020 Series. All Bonds of the 2020 Series shall mature September 1, 2020, and will bear interest at the rate of 9.57% per annum (computed on the basis of a 360-day year of
twelve 30-day months) until the payment of the principal thereof, such interest to be payable commencing March 1, 1991, and thereafter semi-annually on September 1 and March 1 in each year. The Company also promises to pay interest at
the rate per annum 1% in excess of the rate per annum specified herein on any overdue payment of principal and, to the extent permitted by law, on any overdue payment of interest, until the same shall be paid in full. The principal of and interest
on the Bonds of the 2020 Series will be paid in coin or currency of the United States of America which at the time of payment is legal tender for the payment of public and private debts. Principal of Bonds of the 2020 Series will be payable at the
principal corporate trust office of the Trustee, or its successor in trust, in the City of Chicago, Illinois, except that, in the case of the redemption as a whole at any time of Bonds of the 2020 Series then outstanding, the Company may designate
in the redemption notice other offices or agencies at which, at the option of the holders, Bonds of the 2020 Series may be surrendered for redemption and payment. Except as hereinafter provided, interest on Bonds of the 2020 Series will be payable
at the principal corporate trust office of the Trustee, or its successor in trust, in the City of Chicago, Illinois, in each case to the holder of record on the record date (as hereinbelow defined). Interest on the Bonds of the 2020 Series shall,
unless otherwise directed by the holder, be paid by checks payable to the order of the respective holders entitled thereto, and mailed by the Trustee by first class mail, postage prepaid, to such holders at their respective registered addresses as
shown on the Bond register for the Bonds of the 2020 Series. 
  

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 Notwithstanding any provision in the Indenture to the contrary, each Bond of the 2020 Series shall be
dated the date of the authentication thereof by the Trustee, and shall bear interest on the principal amount thereof from the interest payment date next preceding the date thereof to which interest has been paid on the Bonds of the 2020 Series, or
if the date thereof is prior to February 15, 1991, then from the date of authentication and original issuance of the first Bond of the 2020 Series, or if the date thereof be an interest payment date to which interest is being paid or a date
between the record date for any such an interest payment date and such interest payment date, then from such interest payment date; provided, however, that if there shall be an existing default in the payment of interest on Bonds of the 2020 Series
then, unless moneys sufficient for the payment of interest on the next interest payment date shall have been deposited with the Trustee, Bonds of the 2020 Series authenticated between the record date and interest payment date shall bear interest
from the next preceding date to which interest has been paid on the Bonds of the 2020 Series, or if no interest has been paid, from the date of authentication and original issuance of the first Bond of the 2020 Series. 
 Notwithstanding any provision in the Indenture to the contrary, the person in whose name any Bond of the 2020 Series is registered at the close of
business on any record date (as hereinbelow defined) with respect to any interest payment date shall be entitled to receive the interest payable on such interest payment date notwithstanding the cancellation of such Bond of the 2020 Series upon any
transfer or exchange thereof subsequent to the record date and prior to such interest payment date, except that, if and to the extent that the Company shall default in the payment of the interest due on such interest payment date, then the
registered holders of Bonds of the 2020 Series on such record date shall have no further right to or claim in respect of such defaulted interest as such registered holders on such record date, and the persons entitled to receive payment of any
defaulted interest thereafter payable or paid on any Bonds of the 2020 Series shall be the registered holders of such Bonds of the 2020 Series on the record date for payment of such defaulted interest. The term “record date” as used in
this Section 1.01, and in the form of the Bonds of the 2020 Series, with respect to any interest payment date applicable to the Bonds of the 2020 Series, shall mean the close of business on the February 15 next preceding a March 1
interest payment date or the August 15 next preceding a September 1 interest payment date as the case may be (or the preceding business day if a holiday or other day on which the principal corporate trust office of the Trustee is closed),
or such record date established for defaulted interest as hereinafter provided. 
  

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 In case of failure by the Company to pay interest when due, the claim for such interest shall be deemed
to have been transferred by transfer of any Bonds of the 2020 Series registered on the books of the Company and the Company, by not less than 10 days’ written notice to bondholders, may fix a subsequent record date, not more than 30 days prior
to the date fixed for the payment of such interest, for determination of holders entitled to payment of such interest. Such provision for establishment of a subsequent record date, however, shall in no way affect the rights of bondholders or of the
Trustees consequent on any default. 
 As permitted by the provisions of Section 3.10 of the Original Indenture and upon payment at the
option of the Company of a sum sufficient to reimburse it for any stamp tax or other governmental charge as provided in Section 3.11 of the Original Indenture, Bonds of the 2020 Series may be exchanged for other registered Bonds of the 2020
Series of different authorized denominations of like aggregate principal amount. Notwithstanding the provisions of Section 3.11 of the Original Indenture, no further sum, other than the sum sufficient to reimburse the Company for such stamp
taxes or other governmental charges, shall be required to be paid upon any exchange of Bonds of the 2020 Series or upon any transfer thereof. 
 The Trustee hereunder shall, by virtue of its office as such Trustee, be a paying agent of the Company for the purpose of the payment of the principal of and interest on the Bonds of the 2020 Series and the registrar and transfer agent of
the Company for the purpose of registering and transferring Bonds of the 2020 Series. Neither the Company nor the Trustee shall be required to make transfers or exchanges of any Bonds designated for redemption. 
 B. Form of Bonds of the 2020 Series. The Bonds of the 2020 Series, and the Trustee’s authentication certificate to be executed on the Bonds
of said series, shall be in substantially the following forms, respectively: 
 [Form of Face of Bond of the 2020 Series] 
  

			
	No.     	 	$             

 WASHINGTON NATURAL GAS COMPANY 
 First Mortgage Bond, 9.57% Series Due 2020 
 Due September 1, 2020 
  

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 WASHINGTON NATURAL GAS COMPANY, a Washington corporation (hereinafter sometimes called the
“Company”), for value received, hereby promises to pay to
                                 or registered assigns,
                                         Dollars
on September 1, 2020 and to pay interest hereon from the interest payment date next preceding the date hereof to which interest has been paid on the bonds of this series, or if the date hereof is prior to February 15, 1991, then from
                     *                      , or
if the date hereof is an interest payment date to which interest is being paid or a date between the record date for any such an interest payment date and such interest payment date, then from such interest payment date, at the rate per annum
specified in the title of this bond, payable semi-annually on the first days of March and September in each year until payment of the principal hereof; provided, however, that if there shall be an existing default in the payment of
interest on bonds of this series then, unless moneys sufficient for the payment of interest on the next interest payment date shall have been deposited with the Trustee, bonds authenticated between the record date and interest payment date shall
bear interest from the next preceding date to which interest has been paid on the bonds of this series, or if no interest has been paid, from
                                         
                    *
                                         
                    . The interest so payable upon any March 1 or September 1 will, subject to certain exceptions described on the reverse
hereof, be paid to the person in whose name this bond is registered at the close of business on the February 15 preceding such March 1 or the August 15 preceding such September 1, as the case may be (or the preceding business day
if a holiday or other day on which the principal corporate trust office of the Trustee is closed), and shall be computed on the basis of a 360-day year of twelve 30-day months. The Company also promises to pay to the holder of this bond interest at
the rate per annum 1% in excess of the rate per annum specified in the title of this bond on any overdue payment of principal and, to the extent permitted by law, on any overdue payment of interest, until the same shall be paid in full. 

The principal of and interest on this bond will be paid in any coin or currency of the United States of America which at the time of payment is legal
tender for the payment of public and private debts. The principal of this bond will be payable at the principal corporate trust office of Harris Trust and Savings Bank, the Trustee, or its successor in trust, in the City of Chicago, State of
Illinois, except that, in case of the redemption as a whole at any time of the bonds of this series then outstanding, the Company may designate in the redemption notice other offices or agencies at which, at the option of the holder, this bond may
be surrendered for redemption and payment. Interest on this bond will be payable at the principal corporate trust office of Harris Trust and Savings Bank, the Trustee, or its successor in trust, in the city of Chicago, State of 

  

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Illinois; provided, however, that interest on this bond shall, unless otherwise directed by the registered holder hereof, be paid by check to the order of
the registered holder entitled thereto and mailed by the Trustee by first class mail, postage prepaid, to such holder at his address as shown on the bond register for the bonds of this series. 
 This bond shall not become obligatory for any purpose or be entitled to any security or benefit under the Indenture hereinafter mentioned until the
authentication certificate hereon shall have been signed by the Trustee. 
 The provisions of this bond are continued on the reverse hereof
and such continued provisions shall for all purposes have the same effect as though fully set forth at this place. 
 IN WITNESS WHEREOF,
WASHINGTON NATURAL GAS COMPANY has caused these presents to be executed in its corporate name by the manual or facsimile signature of its President or one of its Vice Presidents, under its corporate seal or facsimile thereof, attested by the manual
or facsimile signature of its Secretary or one of its Assistant Secretaries, all as of 
  

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	WASHINGTON NATURAL GAS COMPANY
		
	By:	 	  

		 	President

  

	
	ATTEST:
	
	  

	Secretary
	
	  

	*	Insert the date of authentication and original issuance of the first Bond of the 2020 Series. 

 [Form of Reverse of Bond] 
 This bond is one of the bonds, of the above designated
series, of an authorized issue of bonds of the Company known as First Mortgage Bonds, not limited as to maximum aggregate principal amount, all issued or issuable in one or more series under and equally and proportionately secured (except in so far
as any sinking fund, renewal fund or other fund established in accordance with the provisions of the Indenture hereinafter mentioned may afford additional security for the bonds of any specific series) by an Indenture of First Mortgage dated as of
April 1, 1957 (herein sometimes called the “Original Indenture”), executed and delivered by the Company to Harris Trust and Savings Bank, as Trustee (herein and its successors under said Indenture sometimes called the
“Trustee”), as supplemented by a First Supplemental Indenture dated as of April 1, 1957, executed by the Company, the Trustee and R. H. Long, the Co-Trustee originally appointed thereunder and as supplemented by a Sixteenth
Supplemental Indenture dated as of June 1, 1977, executed by the Company, the Trustee and R.G. Mason, the successor Co-Trustee appointed thereunder (said Trustee and successor Co-Trustee herein sometimes called the “Trustees”), and as
supplemented and modified by the Sixth Supplemental Indenture dated as of August 1, 1966, by the Seventh Supplemental Indenture dated as of February 1, 1967, by the Seventeenth Supplemental Indenture dated as of August 9, 1978, and by
the Twenty-second Supplemental Indenture dated as of July 15, 1986, and as supplemented by all other indentures supplemental thereto, including in particular a Twenty-seventh Supplemental Indenture dated as of September 1, 1990 (herein
sometimes called the “Twenty-seventh Supplemental Indenture”), executed by the Company and the Trustees, to which 

  

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Indenture of First Mortgage and all indentures supplemental thereto (herein sometimes called the “Indenture”) reference is hereby made for a
description of the property mortgaged and pledged as security for said bonds, the nature and extent of the security, the rights, duties and immunities thereunder of the Trustees, the rights of the holders of said bonds and of the Trustees and of the
Company in respect of such security, and the terms upon which said bonds may be issued thereunder. 
 The bonds of this series are issuable
solely as registered bonds without coupons in denominations of $1,000 or any multiple of $1,000. 
 The bonds of this series are subject to
redemption prior to maturity only (a) by the application of the proceeds of certain property subject to the lien of the Indenture upon payment of the called principal amount thereof if any sale or taking of the nature described in
Section 7.04 of the Original Indenture shall occur or (b) as a whole at any time or in part from time to time, at the option of the Company, upon payment of the called principal amount thereof plus a redemption premium calculated as
follows: 
 Such redemption premium shall be equal to the amount (but not less than zero) obtained by subtracting (1) the sum of the
unpaid principal amount of such bond (or the portion thereof) being redeemed and the amount of interest thereon accrued to the redemption date, from (2) the sum of the Current Value (as hereinafter defined) of all amounts of principal and
interest on such bond (or the portion thereof) being redeemed that would otherwise have become due on and after the date of such determination if such bond were not being redeemed (each such amount of principal or interest being referred to herein
as an “Amount Payable”). The “Current Value” of any Amount Payable means such Amount Payable discounted (on a semiannual basis) to its present value on the date of determination on the basis of Treasury Yield (as hereinafter
described), in accordance with the following formula: 
  

			
	Current Value =	 	 Amount Payable

	 	(1 + d/2)n

 where “d” is the sum of (i) 75 basis points (if the date of redemption is on or before 1995), 50
basis points (if the date of redemption is after 1995 and on or before 2005), 25 basis points (if the date of redemption is after 2005 and on or before 2015), and no basis points (if the date of redemption is after 2015), in each case plus
(ii) the Treasury Yield per annum expressed as a decimal, and “n” is an exponent (which need not be an integer) equal to the number of semiannual periods and portions thereof (any such portion of a period to be determined by dividing
the 

  

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number of days in such portion of such period by the total number of days in such period, both computed on the basis of twelve 30-day months in a 360-day
year) between the date of such determination and the due date of the Amount Payable. The “Treasury Yield” shall be determined by reference to the most recent Federal Reserve Statistical Release H.15 (519), and shall be the most recent
weekly average yield on actively traded U.S. Treasury Securities adjusted to a constant maturity equal to the then remaining weighted average life to maturity of all Amounts Payable (the “Remaining Life”), computed by dividing (x) the
sum of all Amounts Payable into (y) the total of the products obtained by multiplying (A) the amount of each Amount Payable by (B) the number of years (calculated to the nearest one-twelfth) which will elapse between the date as of
which such computation is made and the due date of the Amount Payable. 
 If this bond or any portion hereof ($1,000 or any multiple thereof)
is duly designated for redemption, if payment of the principal hereof or of such portion, together with accrued interest, and premium, if any, is irrevocably provided for and if notice of such redemption is duly given or provided for, or waived, all
as specified in the Indenture, this bond or such portion shall cease to be entitled to the lien of the Indenture from and after the date such payment and notice are irrevocably so provided for and shall cease to bear interest from and after the date
fixed for redemption. 
 In the event of the selection for redemption of a portion only of the principal of this bond, payment of the
redemption price will be made at the option of the registered owner, either (a) upon presentation of this bond for notation hereon of such payment of the portion of the principal of this bond so called for redemption, or (b) upon surrender
of this bond in exchange for a bond or bonds (of authorized denominations of the same series) for the unredeemed balance of the principal amount of this bond, or (c) pursuant to the provisions of any agreement providing for the making of
notations of principal payments on this bond by the holders thereof or by an agency of the Company or the Trustee, as provided in the Indenture. In the event of the redemption of this bond in whole, payment of the redemption price will be made only
upon surrender of this bond. 
 The Indenture contains provisions permitting the Company and the Trustees, with the consent of the holders of
not less than sixty-six and two-thirds per cent in principal amount of the bonds at the time outstanding (determined as provided in the Indenture) including, if more than one series of bonds shall be at the time outstanding, not less than sixty-six
and two-thirds per cent in principal amount of the bonds at the time outstanding of each series affected, to effect, by an indenture supplemental to the Indenture, modifications or alterations of the Indenture 

  

 -14- 

 
and of the rights and obligations of the Company and of the holders of the bonds and coupons; provided, however, that no such modification or alteration
shall be made without the consent of the registered owner hereof which will (a) extend the maturity of this bond or reduce the rate or extend the time of payment of interest herein or reduce the amount of the principal hereof, or
(b) permit the creation of any lien, not otherwise permitted, prior to or on a parity with the lien of the Indenture, or alter the equal and proportionate security afforded by the lien of the Indenture for the bonds issued thereunder, or
(c) reduce the number or percentage of the principal amount of the bonds upon the consent of the holders of which modifications or alterations may be made as aforesaid or defaults may be waived. 
 This bond is transferable by the registered owner hereof in person or by his duly authorized attorney, on books of the Company kept for the purpose at
the principal corporate trust office of the Trustee, upon surrender of this bond for cancellation and upon payment, if the Company shall so require, of the charges provided for in the Twenty-seventh Supplemental Indenture, sufficient to reimburse
the Company for any stamp tax or other governmental charge incident thereto, and thereupon a new registered bond of the same series of like principal amount will be issued to the transferee in exchange therefor. 
 The registered owner of this bond at his option may surrender the same for cancellation at said office and receive in exchange therefor the same
aggregate principal amount of registered bonds of the same series but of other authorized denominations, upon payment, if the Company shall so require, of the charges provided for in the Twenty-seventh Supplemental Indenture, sufficient to reimburse
the Company for any stamp tax or other governmental charge incident thereto, and subject to the terms and conditions therein set forth. 
 Neither the Company nor the Trustee shall be required to make transfers or exchanges of any bonds designated for redemption. 
 If a
default as defined in the Indenture shall occur, the principal of this bond may become or be declared due and payable before maturity in the manner and with the effect provided in the Indenture. The holders, however, of certain specified percentages
of the bonds at the time outstanding, including in certain cases specified percentages of bonds of particular series, may in the cases, to the extent and under the conditions provided in the Indenture, waive certain defaults thereunder and the
consequences of such defaults. 
 The Twenty-seventh Supplemental Indenture provides that in the event of any default in payment of the
interest due on any 

  

 -15- 

 
interest payment date, such interest shall not be payable to the holder of the bond on the original record date but shall be paid to the registered holder of
such bond on the subsequent record date established for payment of such defaulted interest. 
 The Company and the Trustee, any paying agent
and any bond registrar, may deem and treat the person in whose name this bond is registered, or his registered assigns, as the absolute owner hereof, whether or not this bond shall be overdue, for the purpose of receiving payment and for all other
purposes and neither the Company nor the Trustee nor any paying agent nor any bond registrar shall be affected by any notice to the contrary. 
 [FORM OF ASSIGNMENT] 
  

			
	 For value received, the undersigned hereby sells, assigns and transfers unto
	 	  

	  

	 Please Insert Social Security or Other Identifying Number of Assignee

 the within bond, and all rights thereunder, hereby irrevocably constituting and appointing attorney to transfer
said bond on the books of the Company, with full power of substitution in the premises. 
  

	
	  

  

	
	Dated:
	
	In the presence of:
	
	  

 NOTICE: The signature to this assignment must correspond with the name as it appears upon the face
of the within bond in every particular, without alteration or enlargement or any change whatever. 
 [FORM OF TRUSTEE’S AUTHENTICATION
CERTIFICATE] 
 This is one of the bonds, of the series designated therein, described in the within mentioned Indenture. 
  

 -16- 

			
	HARRIS TRUST AND SAVINGS BANK,
	As Trustee,
		
	By:	 	  

		 	Authorized Officer

 SECTION 1.02. Redemption Provisions for Bonds of the 2020 Series. The Bonds of the
2020 Series shall be subject to redemption prior to maturity: 
 (a) as a whole at any time or in part from time to time, at the option of the
Company, upon payment of a redemption premium, calculated in accordance with the formula set forth in the form of the Bonds of the 2020 Series set forth in Section 1.01 of this Twenty-seventh Supplemental Indenture; or 
 (b) as a whole at any time upon payment of 100% of the principal amount thereof if any sale or taking of the nature described in Section 7.04 of the
Original Indenture of all or substantially all of the property of the Company shall occur, through the application pursuant to Section 8.05 of the Original Indenture of any trust moneys held by the Trustee received from the proceeds of such
property sold or taken pursuant to the provisions of Section 7.04 of the Original Indenture. 
 Any redemption pursuant to the
provisions of this Section 1.02 shall be made, together in any case with interest accrued thereon to the date fixed for redemption, upon not less than thirty days’ nor more than ninety days’ notice given by first class mail, postage
prepaid, to the holder of record at the date of such notice of each Bond of the 2020 Series, at his address as shown on the Bond register. Such notice shall be sufficiently given if deposited in the United States mail as aforesaid within such
period. Neither the failure to mail such notice, nor any defect in any notice so mailed to any holder, shall affect the sufficiency of such notice with respect to other holders. The foregoing provision with respect to notice shall be subject to all
other conditions and provisions of the Indenture not inconsistent therewith. 
 Whenever less than all of the outstanding Bonds of the 2020
Series are to be redeemed, the principal amount of such Bonds to be redeemed shall be prorated in units of $1,000 each among the holders of the Bonds of the 2020 Series in the proporation that their respective holdings bear to the aggregate
principal amount of Bonds of the 2020 Series outstanding on the date of selection. 
 Subject to the specific provisions set forth
hereinabove in this Section 1.02 and in the form of the Bonds of the 2020 Series in Section 1.01 hereof, the provisions of Article Ten of the 

  

 -17- 

 
Indenture shall govern any redemption of the Bonds of such series. 
 Section 1.03. Renewal Fund. Notwithstanding the provisions of Section 4.06 of the Original Indenture, the Company hereby covenants that so long as any of the Bonds of the 2020 Series shall remain
outstanding (a) the covenants made by the Company in Section 4.04 of the Original Indenture shall continue in full force and effect and (b) Bond credits and Bonds delivered as credits in any annual or interim renewal fund certificate
shall be funded (as defined in Section 1.33(3) of the Original Indenture), and shall not again be used as the basis of action or credit under the Indenture, unless and to the extent that the same have been reinstated or unfunded, as provided in
said Section 4.04 or in Section 2.03 of the Original Indenture. Cash deposited in the renewal fund may not be applied to the redemption of the Bonds of the 2020 Series. 
 Section 1.04. Restriction on Payment of Dividends on Common Stock. The Company hereby covenants that so long as any of the Bonds of the 2020
Series shall remain outstanding it shall not directly or indirectly (a) declare or pay any dividend (other than dividends payable in Common Stock of the Company) or declare or make any other distribution on any shares of Common Stock, or
(b) make, or permit any subsidiary to make, any expenditures for the purchase, redemption or other retirement for a consideration of any shares of capital stock of the Company (other than in exchange for, or from the net cash proceeds of, other
and new shares of capital stock of the Company and other than any shares of any class of stock ranking as to dividends or assets prior to the Common Stock of the Company required to be purchased, redeemed or otherwise retired for any sinking fund or
purchase fund for such class of stock), if the aggregate amount of all such dividends, distributions and expenditures made since September 30, 1989, would exceed the aggregate amount of the net income of the Company accumulated after
September 30, 1989 plus the sum of $20,000,000. 
 Net income of the Company for the purpose of this Section shall mean the sum of
(a) the total operating revenues of the Company, less an amount equal to the total operating expenses of the Company, including but not limited to (i) all taxes (including without limitation income, excess profits and other taxes imposed
on or measured by income or undistributed earnings or income), (ii) rentals, insurance, current repairs and maintenance, (iii) provision for retirements, depreciation or obsolescence, which shall be the amount actually charged by the
Company on its books of account (but in respect of depreciable gas utility property not subject to prior liens, shall not be less than the minimum provision for depreciation as defined in Section 1.32 of the Original Indenture), and
(iv) all charges on 

  

 -18- 

 
account of interest on indebtedness and on account of debt discount and expense, and (b) net income or loss from the operation of properties other than
the trust estate and any other income received (less applicable expenses) or loss incurred by the Company; which sum shall be diminished by an amount equal to all dividends accrued subsequent to September 30, 1989 (whether or not paid) on any
outstanding stock of the Company having preference over the Common Stock as to dividends, assets or otherwise, all of the foregoing determined in accordance with generally accepted accounting principles. In determining the net income of the Company
for the purpose of this Section, no deduction or adjustment shall be made for or in respect of any charges or credits which under generally accepted accounting principles are not appropriate charges or credits in determining net income, but, in any
event, the following items shall be excluded from the computation: (1) expenses in connection with the issuance of stock of the Company and expenses in connection with the redemption or retirement of any securities issued by the Company,
including any amount paid in excess of the principal amount or par or stated value of securities redeemed or retired, or, in the event that such redemption or retirement is effected with the proceeds of sale of other securities of the Company, any
interest or dividends on the securities redeemed or retired from the date on which the funds required for such redemption or retirement are deposited in trust for such purpose to the date of redemption or retirement, (2) profits or losses from
the sale, abandonment or other disposition of property or other assets carried in plant or investment accounts of the Company, or from the reacquisition of any securities of the Company, or taxes in respect of any such profits, (3) any change
in or adjustment of the book value of any assets owned by the Company arising from a revaluation thereof, (4) any adjustment (including tax adjustments) applicable to any period prior to October 1, 1989, or (5) amortization or
elimination of gas utility property plant adjustment or acquisition accounts or intangibles. 
 The Company covenants that it will not,
directly or indirectly, reclassify or otherwise convert Common Stock into any stock preferred over Common Stock as to dividends or upon liquidation. 
 Section 1.05. Restrictions on Funded Debt. The Company hereby covenants that so long as any of the Bonds of the 2020 Series shall remain outstanding it will not incur any Funded Debt (i) if
immediately thereafter the aggregate principal amount of all Funded Debt to be outstanding shall exceed 65% of Total Capitalization, or (ii) unless Net Earnings Available for Interest, for a period of 12 consecutive calendar months within the
15 calendar months immediately preceding the incurrence of such debt, shall be not less than 1.75 times the aggregate of annual interest charges on all indebtedness of the Company to be 

  

 -19- 

 
outstanding immediately after such incurrence (excluding from such computation of interest charges, interest on any indebtedness which is to be paid,
redeemed or otherwise retired or provision for the retirement of which is to be made, prior to or concurrently with the incurrence of such debt). 
 Section 1.06. Meanings of Certain Terms used in Section 1.05 of this Twenty-seventh Supplemental Indenture. As used in Section 1.05 of this Twenty-seventh Supplemental Indenture: 
 (1) Net Earnings Available for Interest shall be determined in accordance with generally accepted accounting principles by deducting, from the total
operating revenues and other income of the Company for the period in question, an amount equal to the total operating expenses for such period, including but not limited to (i) all taxes other than income, excess profits and other taxes imposed
on or measured by income or undistributed earnings or income or any income in the computation of which interest is deductible; (ii) rentals, insurance, current repairs and maintenance; and (iii) provision for retirements, depreciation or
obsolescence, which shall be the amounts actually charged on the appropriate books of account (but in respect of depreciable gas utility property of the Company not subject to prior liens, shall not be less than the minimum provision for
depreciation as defined in Section 1.32 of the Original Indenture), but excluding any charges on account of interest on indebtedness, or on account of debt discount and expense. No amortization or elimination of gas utility property plant
adjustment or acquisition accounts or intangibles, shall be taken into account in determining Net Earnings Available for Interest. 
 If the
Company shall have acquired, within or after the period for which Net Earnings Available for Interest is being determined, or will acquire in connection with the incurrence of indebtedness which is the subject of such determination, properties which
within six months prior to such acquisition were used or operated in a business similar to that in which they are or are to be used or operated by the Company, and if the earnings of such properties can be separately determined or fairly estimated
in accordance with generally accepted accounting principles, then, in computing Net Earnings Available for Interest, the net earnings of such properties for the whole of such period shall be included as if such properties had been owned by the
Company, during the whole of such period; and if, within or after said period, any portion of the properties of the Company exceeding $500,000 in value shall have been disposed of by the Company, or will be disposed of in connection with the
incurrence of indebtedness which is the subject of such determination, and if the earnings of such properties can be separately determined or fairly estimated in accordance with generally accepted accounting principles, then in computing Net 

  

 -20- 

 
Earnings Available for Interest, the net earnings of such properties for the whole of such period shall be excluded. 
 (2) The term “Funded Debt” of the Company shall mean, at any date as of which the amount thereof is to be determined, (i) all debt of the
Company and all obligations of the Company under any lease or other agreement which, in accordance with generally accepted accounting principles, should be capitalized on the Company’s balance sheet or for which the amount of liability
thereunder if so capitalized should be disclosed in such balance sheet, whether secured or unsecured, maturing by its terms more than one year after the date of the creation thereof (notwithstanding the fact that payments (whether installment,
serial or sinking fund payments or otherwise) are required to be made less than one year after such date in respect of any such debt or obligation and notwithstanding the fact that part thereof is at any time classified, in accordance with generally
accepted accounting principles, as current liabilities), (ii) any indebtedness or obligation maturing in not more than one year from the date of creation which by its terms can be extended or renewed beyond such period at the option of the
Company, (iii) any debt or obligation maturing by its terms not more than one year after the date of the creation thereof if secured by the pledge of Bonds by the Company, (iv) the amount determined by the multiplication of (a) seven
(7) and (b) the amount, required to be disclosed with respect to operating leases of the Company in accordance with generally accepted accounting procedures, of the minimum future rental payments required to be made in the fourth
subsequent year ended after the year of the financial statements being reported, (v) all guarantees (direct or indirect), all contingent reimbursement obligations under undrawn letters of credit and other contingent obligations of the Company
in respect of, or obligations to purchase or otherwise acquire or to assure payment of, indebtedness of others, and (vi) indebtedness of others secured by any lien upon property owned by the Company, whether or not assumed. For the purposes of
this definition, any debt or obligation which is extended or renewed (other than at the option of the Company pursuant to the terms thereof) shall be deemed to have been created at the effective date of such extension or renewal. 
 (3) The term “generally accepted accounting principles” shall have the same meaning as “sound accounting practice” as defined in the
Original Indenture. 
 (4) The term “Total Capitalization” shall have the meaning set forth with respect thereto in
Section 4.05 of the Original Indenture. 
 Section 1.07. Parties in Interest; Duration of Effectiveness of Article One. The
covenants, conditions and 

  

 -21- 

 
provisions of this Article One shall, except to the extent that failure to comply herewith shall (with the lapse of time or the giving of notice, or
otherwise) constitute a default under the Indenture, be for the sole and exclusive benefit of the Company, the Trustees and the holders of the Bonds of the 2020 Series. This Article One shall be of force and effect only so long as any Bonds of the
2020 Series are outstanding. 
 ARTICLE TWO 
 PRINCIPAL AMOUNT OF BONDS PRESENTLY TO BE OUTSTANDING 
 Section 2.01. The total aggregate principal amount of the First Mortgage Bonds of the Company issued and outstanding and presently to be issued and outstanding under the provisions of and secured by the Indenture, will be Two Hundred
Twenty One Million Two Hundred Ninety Thousand Dollars ($221,290,000), namely Four Million Nine Hundred Forty Thousand Dollars ($4,940,000) principal amount of First Mortgage Bonds, 6- 1/8% Series due 1991, Four Million One Hundred Forty Thousand Dollars ($4,140,000) principal amount of First Mortgage Bonds, 6- 5/8% Series due 1992, Four Million Three Hundred Thousand Dollars ($4,300,000) principal amount of First Mortgage Bonds, 6- 7/8% Series due 1993, Fifteen Million Dollars ($15,000,000) principal amount of First Mortgage Bonds, 12% Series due 1993, Twenty Million Dollars ($20,000,000) principal
amount of First Mortgage Bonds, 8- 5/8% Series due 1994, Eight Million Seven Hundred Ninety Thousand Dollars ($8,790,000)
principal amount of First Mortgage Bonds, 10- 1/4% Series due 1995, Forty Million Dollars ($40,000,000) principal amount of First
Mortgage Bonds, 9.96% Series due 1995, Three Million Six Hundred Twenty Thousand Dollars ($3,620,000) principal amount of First Mortgage Bonds, 8- 7/8% Series due 1996, Twenty Five Million Dollars ($25,000,000) principal amount of First Mortgage Bonds, 8.80% Series due 1996, Three Million Nine Hundred Thousand Dollars ($3,900,000) principal amount of First Mortgage
Bonds, 8- 1/8% Series due 1997, Thirty Million Dollars ($30,000,000) principal amount of First Mortgage Bonds, 10- 1/4% Series due 1997, Eleven Million Six Hundred Thousand Dollars ($11,600,000) principal amount of First Mortgage Bonds, 10.40%
Series due 1999, now issued and outstanding and Twenty Five Million Dollars ($25,000,000) principal amount of First Mortgage Bonds, 9.60% Series due 2000 and Twenty Five Million Dollars ($25,000,000) principal amount of First Mortgage Bonds, 9.57%
Series due 2020 to be issued upon compliance by the Company with the provisions of Sections 5.02, 5.03, 5.04 and/or 5.05 of the Original Indenture. 
  

 -22- 

 ARTICLE THREE 
 MISCELLANEOUS 
 Section 3.01. This Twenty-seventh Supplemental Indenture is executed and shall be
construed as an indenture supplemental to the Original Indenture, and shall form a part thereof, and the Original Indenture, as heretofore supplemented and modified and as hereby supplemented, is hereby confirmed. All terms used in this
Twenty-seventh Supplemental Indenture shall be taken to have the same meaning as in the Original Indenture except in cases where the context clearly indicates otherwise. 
 Section 3.02. Neither the Trustee nor the Co-Trustee shall be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Twenty-seventh Supplemental Indenture or the due
execution thereof by the Company or for or in respect of the recitals of fact and statements contained herein. The Company covenants and agrees that all such recitals and statements are made by it solely and that the same are true. 
 Section 3.03. This Twenty-seventh Supplemental Indenture may be executed in any number of counterparts, each of which shall be an original; but such
counterparts shall together constitute but one and the same instrument. 
 IN WITNESS WHEREOF, WASHINGTON NATURAL GAS COMPANY has caused this
Twenty-seventh Supplemental Indenture to be signed in its corporate name and behalf by its President or one of its Vice Presidents and its corporate seal to be hereunto affixed and attested by its Secretary or an Assistant Secretary, and HARRIS
TRUST AND SAVINGS BANK has caused this Twenty-seventh Supplemental Indenture to be signed in its corporate name and behalf by its President or one of its Vice Presidents and its corporate seal to be hereunto affixed and attested by its Secretary or
an Assistant Secretary, and the said R.G. Mason has hereunto set his hand, all on the dates of their respective acknowledgments but effective as of the day and year first above written. 
  

 -23- 

			
	WASHINGTON NATURAL GAS COMPANY
		
	By:	 	 R.R. Golliver

		 	R.R. GOLLIVER
		 	President

  

	
	(SEAL)
	
	ATTEST:
	
	 Timothy J. Hogan

	 TIMOTHY J. HOGAN
 Secretary

  

			
	HARRIS TRUST AND SAVINGS BANK
	as Trustee
		
	By:	 	 J. Bartolini

		 	J. BARTOLINI
		 	Vice-President

  

	
	(SEAL)
	
	ATTEST:
	
	 C. Potter

	C. POTTER
	Assistant Secretary

  

	
	 R.G. Mason

	R.G. MASON
	Co-Trustee

  

			
	STATE OF WASHINGTON	  	)
		  	) ss.
	COUNTY OF KING	  	)

 On this 30th day of August, A.D., 1990, before me personally appeared R.R. GOLLIVER, to me
known to be the President, and TIMOTHY J. HOGAN, to me known to be the Secretary of WASHINGTON NATURAL GAS COMPANY, the corporation that executed the within and foregoing instrument, and acknowledged the said instrument to be the free and voluntary
act and deed of said corporation, for the uses and purposes therein mentioned, and on oath stated that they 

  

 -24- 

 
were authorized to execute said instrument and that the seal affixed is the corporate seal of said corporation. 
 IN WITNESS WHEREOF, I have hereunto set my hand and affixed my official seal the day and year first above written. 
  

			
	 Moneca McYnturff

	NOTARY PUBLIC in and for the State of Washington, residing at: Redmond
	My Commission Expires: 7-1-93

 (NOTARIAL SEAL) 
  

			
	STATE OF ILLINOIS	 	)
		 	) ss.
	COUNTY OF COOK	 	)

 On this 31st day of August, A.D., 1990, before me personally appeared J. Bartolini, to me known to
be a Vice President, and C. Potter, to me known to be an Assistant Secretary, of HARRIS TRUST AND SAVINGS BANK, the corporation that executed the within and foregoing instrument, and acknowledged the said instrument to be the free and voluntary
act and deed of said corporation, for the uses and purposes therein mentioned, and on oath stated that they were authorized to execute said instrument and that the seal affixed is the corporate seal of said corporation. 
 IN WITNESS WHEREOF, I have hereunto set my hand and affixed my official seal the day and year first above written. 
  

			
	 T. Muzquiz

	NOTARY PUBLIC in and for the State of Illinois residing at: Chicago
	My Commission Expires: July 12, 1993

 (NOTARIAL SEAL) 
  

			
	STATE OF ILLINOIS	  	)
		  	) ss.
	COUNTY OF COOK	  	)

 On this 31st day of August, A.D., 1990, before me personally appeared R.G. MASON, to me known to
be the individual who executed the within and foregoing instrument, and acknowledged to me that he executed the same as his free and voluntary act and deed, for the uses and purposes therein mentioned. 
  

 -25- 

 IN WITNESS WHEREOF, I have hereunto set my hand and affixed my official seal the day and year first above
written. 
  

			
	 T. Muzquiz

	NOTARY PUBLIC in and for the State of Illinois residing at: Chicago
	My Commission Expires: July 12, 1993

 (NOTARIAL SEAL) 
  

 -26-Thirty-sixth Supplemental Indenture

 EXHIBIT 4.14 
  
  
 SECURITY AGREEMENT 
  
 This is a Security Agreement covering personal property as well as 
 other property real and/or personal 
  
 PUGET SOUND ENERGY, INC. 
 TO 
 THE BANK OF NEW YORK TRUST
COMPANY, N.A., 
 TRUSTEE 
  
  
  
 THIRTY-SIXTH SUPPLEMENTAL INDENTURE 
  
 Dated as of April 29, 2008 
  
 SUPPLEMENTING 
 INDENTURE OF FIRST MORTGAGE 
  
 Dated as of April 1, 1957 

 ANY WRITING, TEXT, INITIALS, REVISIONS OR NOTARY SEAL APPEARING OUTSIDE
THESE MARGINS MAY 
 DISQUALIFY THIS DOCUMENT FOR RECORDING 
 THIS THIRTY-SIXTH SUPPLEMENTAL INDENTURE, made as of the 29th day of April, 2008, by and between Puget Sound Energy, Inc., 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 The Bank of New York Trust Company, N.A., a national banking association duly organized and
existing under the laws of the State of California and having its principal corporate trust office at 700 S. Flower, Los Angeles, CA 90017 (successor to BNY Midwest Trust Company) (hereinafter sometimes called the “Trustee”), as Trustee
under the Indenture of First Mortgage dated as of April 1, 1957 (hereinafter called the “Original Indenture” or, as heretofore supplemented and modified, hereinafter called the “Indenture”), as supplemented and modified by
all indentures supplemental thereto heretofore executed and delivered, party of the second part; 
 WITNESSETH: that 
 WHEREAS, Washington Natural Gas Company, a corporation organized and existing under the laws of the State of Delaware (hereinafter called the “First
Predecessor Company”), which was merged into Washington Natural Gas Company, a corporation organized and existing under the laws of the State of Washington (hereinafter called the “Second Predecessor Company”) on August 9, 1978,
had heretofore executed and delivered to the Trustee its Original Indenture, in order, among other things, to secure, as provided therein, the payment of the principal of and premium, if any, and interest on its bonds (in the Indenture and herein
called the “Bonds”) at any time issued and outstanding thereunder according to their tenor and effect, said Bonds to be designated generally as its “First Mortgage Bonds,” and to be issued in one or more series as provided in the
Original Indenture; and 
 WHEREAS, the First Predecessor Company had heretofore executed and delivered sixteen indentures supplemental to
the Original Indenture as follows: First Supplemental Indenture, dated as of April 1, 1957, naming and appointing, pursuant to the provisions of Section 15.18 of the Original Indenture, R.H. Long, an individual, to act as Co-Trustee
jointly with the Trustee, Second Supplemental Indenture dated as of October 1, 1959, Third Supplemental Indenture dated as of May 1, 1961, Fourth Supplemental Indenture dated as of May 1, 1963, Fifth Supplemental Indenture dated as of
June 1, 1965, Sixth Supplemental Indenture dated as of August 1, 1966, Seventh Supplemental Indenture dated as of February 1, 1967, Eighth Supplemental Indenture dated as of September 1, 1967, Ninth Supplemental Indenture dated
as of September 1, 1968, Tenth Supplemental Indenture dated as of June 1, 1970, Eleventh Supplemental Indenture dated as of April 1, 1971, Twelfth Supplemental Indenture dated as of November 1, 1972, Thirteenth Supplemental
Indenture dated as of 
  

			
	THIRTY-SIXTH SUPPLEMENTAL INDENTURE	  	 PAGE
 1

  

  

 ANY WRITING, TEXT, INITIALS, REVISIONS OR NOTARY SEAL APPEARING OUTSIDE
THESE MARGINS MAY 
 DISQUALIFY THIS DOCUMENT FOR RECORDING 
 September 1, 1975, Fourteenth Supplemental Indenture dated as of September 15, 1975, Fifteenth Supplemental Indenture dated as of March 1, 1977 and Sixteenth Supplemental Indenture dated as of
June 1, 1977, naming and appointing, pursuant to the provisions of Section 15.18 of the Original Indenture, R.G. Mason, an individual, to act as successor Co-Trustee, pursuant to each of which supplemental indentures, except said First,
Seventh, and Sixteenth Supplemental Indentures, the First Predecessor Company provided for the creation of an issue of First Mortgage Bonds, and said Sixth and Seventh Supplemental Indentures provided for certain modifications of the Original
Indenture; and 
 WHEREAS, the Second Predecessor Company has heretofore executed and delivered a Seventeenth Supplemental Indenture dated as
of August 9, 1978, whereby the Second Predecessor Company succeeded to the First Predecessor Company with the same effect as if the Second Predecessor 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 First Predecessor Company merged into the Second Predecessor Company on August 9, 1978 whereupon the Second Predecessor Company acquired all the property, real, personal or mixed, including all
rights, privileges, immunities and franchises, described in the Indenture and thereby conveyed and mortgaged or intended so to be, including also all such property acquired by the First Predecessor Company since the execution and delivery of the
Original Indenture, which by the terms of the Original Indenture is subject or intended to be subjected to the lien thereof; and 
 WHEREAS,
the Second Predecessor Company has also heretofore executed and delivered an Eighteenth Supplemental Indenture dated as of September 1, 1979, a Nineteenth Supplemental Indenture dated as of January 15, 1982, a Twentieth Supplemental
Indenture dated as of August 15, 1983, a Twenty-first Supplemental Indenture dated as of August 15, 1983, a Twenty-second Supplemental Indenture dates as of July 15, 1986, a Twenty-third Supplemental Indenture dated as of
July 15, 1986, a Twenty-fourth Supplemental Indenture dated as of December 15, 1987, a Twenty-fifth Supplemental Indenture dated as of August 15, 1988, a Twenty-sixth Supplemental Indenture dated as of September 1, 1990, a
Twenty-seventh Supplemental Indenture dated as of September 1, 1990, a Twenty-eighth Supplemental Indenture dated as of July 1, 1991, a Twenty-ninth Supplemental Indenture dated as of June 1, 1993 and a Thirtieth Supplemental
Indenture dated as of August 15, 1995 pursuant to each of which supplemental indentures the Second Predecessor Company provided for the creation of an issue of First Mortgage Bonds, and said Twenty-second and Twenty-eighth Supplemental
Indentures provided for certain modifications of the Original Indenture; and 
  

			
	THIRTY-SIXTH SUPPLEMENTAL INDENTURE	  	 PAGE
 2

  

  

 ANY WRITING, TEXT, INITIALS, REVISIONS OR NOTARY SEAL APPEARING OUTSIDE
THESE MARGINS MAY 
 DISQUALIFY THIS DOCUMENT FOR RECORDING 
 WHEREAS, the Company has heretofore executed and delivered a Thirty-First Supplemental Indenture dated as of February 10, 1997, whereby the Company
succeeded to the Second Predecessor Company with the same effect as if the Company had been named in the Original Indenture as the mortgagor company and in the Bonds and coupons as the obligor thereon or maker thereof, and the Second Predecessor
Company merged into the Issuer on February 10, 1997 whereupon the Company acquired all the property, real, personal or mixed, including all rights, privileges, immunities 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 Indenture, which by the terms of the Indenture is subject or intended to be subjected to the lien thereof, such
Thirty-First Supplemental Indenture further provided for certain modifications of the original indenture; 
 WHEREAS, the Company has also
heretofore executed and delivered a Thirty-Second Supplemental Indenture dated as of April 1, 2005, pursuant to such supplemental indentures the Company provided for the creation of an issue of First Mortgage Bonds; 
 WHEREAS, the Company has also heretofore executed and delivered a Thirty-Third Supplemental Indenture dated as of April 27, 2005, a Thirty-Fourth
Supplemental Indenture dated as of April 28, 2006, and a Thirty-Fifth Supplemental Indenture dated as of April 27, 2007, all of which mortgaged, 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; and 
 WHEREAS,
pursuant to the Original Indenture, as heretofore supplemented and modified, there have been executed, authenticated, delivered and issued and there are outstanding as of the date hereof, First Mortgage Bonds of series and in principal amounts as
follows: 
  

			
	Principal Amount of Bonds	  	Series
		
	Twenty-Five Million Dollars ($25,000,000)	  	9.57% First Mortgage Bonds due 2020
		
	Four Million Five Hundred Thousand Dollars ($4,500,000)	  	6.51% and 6.53% Secured Medium-Term Notes, Series B due 2008

  

			
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	Principal Amount of Bonds	  	Series
		
	Thirteen Million Dollars ($13,000,000)	  	6.83% and 6.90% Secured Medium-Term Notes, Series B due 2013
		
	Eight Million Dollars ($8,000,000)	  	6.61% and 6.62% Secured Medium-Term Notes, Series C due 2009
		
	Seven Million Dollars ($7,000,000)	  	7.12% Secured Medium-Term Notes, Series C due 2010
		
	Twelve Million Dollars ($12,000,000)	  	7.35% and 7.36% Secured Medium-Term Notes, Series C due 2015
		
	Seventeen Million Dollars ($17,000,000)	  	7.15% and 7.20% Secured Medium-Term Notes, Series C due 2025
		
	Two Hundred Fifty Million Dollars ($250,000,000)	  	6.724% Pledged First Mortgage Bonds due June 15, 2036

 WHEREAS, R.G. Mason, the successor Co-Trustee, resigned on July 31, 1993 and no successor
trustee was appointed to replace him; 
 WHEREAS, Harris Trust and Savings Bank (the “Original Trustee”) resigned as Trustee,
Paying Agent and Registrar under the Indenture on April 1, 2002; 
 WHEREAS, effective April 1, 2002, the Company appointed BNY
Midwest Trust Company (“BNY Midwest”) to act as Trustee, Paying Agent and Registrar to succeed the Original Trustee in such capacities under the Indenture; 
 WHEREAS, BNY Midwest resigned as Trustee, Paying Agent and Registrar under the Indenture on June 14, 2006; 
 WHEREAS, effective June 14, 2006, the Company appointed The Bank of New York Trust Company, N.A. to act as Trustee, Paying Agent and Registrar to succeed BNY Midwest in such capacities under the Indenture; 
  

			
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 ANY WRITING, TEXT, INITIALS, REVISIONS OR NOTARY SEAL APPEARING OUTSIDE
THESE MARGINS MAY 
 DISQUALIFY THIS DOCUMENT FOR RECORDING 
 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, in order to secure the payment and performance of its obligations under such Debenture Indenture, the Company has agreed to create new Bonds
from time to time with substantially the same terms as the Senior Notes; to issue and deliver such Bonds to the Debenture Indenture Trustee in trust for the benefit of the owners from time to time of the Senior Notes; and 
 WHEREAS, the Board of Directors of the Company has established a new series of Bonds to be designated as “Pledged First Mortgage Bonds” due
Nine Months or More From Date of Issue (hereinafter sometimes called “Bonds of the New Series”), and has authorized the issuance of an unlimited aggregate principal amount thereof, and the Company has complied or will comply with all
provisions required to issue additional Bonds provided for in the Indenture; and 
 WHEREAS, the Company desires to execute and deliver this
Thirty-Sixth 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
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 
  

			
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 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 The Bank of New York Trust Company, 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 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: 
  

			
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 List of Real Estate in the State of Washington Acquired by 
 Puget Sound
Energy, Inc. to Date, and Not Heretofore Specifically 
 Described in Any Prior Supplemental Indenture** 
 Puget Sound Energy, Inc. 
 IN KING COUNTY,
WASHINGTON: 
 Description: LOT 2, BLOCK 71, DENNY AND HOYTS ADDITION, ACCORDING TO THE PLAT THEREOF RECORDED IN VOLUME 2 OF PLATS,
PAGE 136, IN KING COUNTY, WASHINGTON; 
 EXCEPT THAT PORTION CONDEMNED FOR LAKE WASHINGTON SHIP CANAL ON NOVEMBER 25, 1898, UNDER KING COUNTY
SUPERIOR COURT CAUSE NUMBER 21942. 
  

			
	Deed From:	  	Seattle Pacific University
		
	Deed Records	  	
	Auditors File No.:	  	20070718001705
		
	Assessor’s Tax	  	
	Parcel ID#:	  	197220-6490-02

 IN PIERCE COUNTY, WASHINGTON: 
  

			
	Section:	  	14

  
  
 ** 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. 
  

			
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	Township:	  	19N
		
	Range:	  	03E

 Description: LOT 2 of SHORT PLAT NO. 78-138, AS RECORDED FEBRUARY 28, 1978 IN VOLUME 23 OF
SHORT PLATS, PAGE 75, RECORDS OF PIERCE COUNTY AUDITOR; 
  

			
	Deed From:	  	Sean O. Probst
		
	Deed Records	  	
	Auditors File No.:	  	200705301703
		
	Assessor’s Tax	  	
	Parcel ID#:	  	0319145002

  

			
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 ARTICLE ONE 
 MISCELLANEOUS 
 SECTION 1.01 
 This Thirty-Sixth
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. 
 SECTION 1.02 
 The Trustee has
accepted the amendment of the Indenture effected by this Thirty-Sixth 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 Thirty-Sixth 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. 
 SECTION 1.03 
 The Company covenants that it is lawfully seized and possessed of all the trust estate
at the date of the execution of the Thirty-Sixth 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. 
  

			
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 SECTION 1.04 
 This Thirty-Sixth
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. 
 SECTION 1.05 
 Although this Thirty-Sixth Supplemental Indenture is dated for convenience and for the purpose of reference as of April 29, 2008, the actual
date or dates of execution by the Company and by the Trustee are as indicated by their respective acknowledgments hereto annexed. 
  
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 ANY WRITING, TEXT, INITIALS, REVISIONS OR NOTARY SEAL APPEARING OUTSIDE
THESE MARGINS MAY 
 DISQUALIFY THIS DOCUMENT FOR RECORDING 
 IN WITNESS WHEREOF, Puget Sound Energy, Inc. has caused this Thirty-Sixth 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   29  , 2008, but as of the day and year first above written. 
  

			
	PUGET SOUND ENERGY, INC.
		
	By	 	     /s/ Donald E. Gaines

		 	    Donald E. Gaines
		 	    Vice President Finance and Treasurer

  
  

			
	Attest:	 	
		
	         /s/ James D. Sant
	 	
	        James D. Sant	 	
	        Assistant Treasurer	 	

  

			
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	STATE OF WASHINGTON	 	)	  	
		 	)	  	ss:
	COUNTY OF KING	 	)	  	

 On this   29   day of
        April        , 2008, 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. 
  

	
	         /s/ Carol A. Nelson

	Notary Name:
	Notary Public in and for the State of
	Washington, residing at Redmond WA.
	My commission expires 7-20-09.

  

			
	THIRTY-SIXTH SUPPLEMENTAL INDENTURE	  	

  

  

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	STATE OF WASHINGTON	 	)	  	
		 	)	  	ss:
	COUNTY OF KING	 	)	  	

 On this   29   day of
        April        , 2008, 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. 
  

	
	         /s/ Carol A. Nelson

	Notary Name:
	Notary Public in and for the State of
	Washington, residing at Redmond WA.
	My commission expires 7-20-09.

  

			
	THIRTY-SIXTH SUPPLEMENTAL INDENTURE

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