Document:

Exhibit

Exhibit 4(f)6
	
		
	 
	 

	 
	 

	When recorded return to:
	 

	 
	 

	David Hight, Esq.
	 

	Ice Miller LLP
	 

	2300 Cabot Drive
	 

	Suite 455
	 

	Lisle, IL  60532
	 

	 
	 

	 
	 

	 
	Space Above this Line Reserved for Recorder’s Use Only

SUPPLEMENTAL INDENTURE

MADE AS OF AUGUST 14, 2019, TO BE EFFECTIVE AUGUST 30, 2019 
____________________
NORTHERN ILLINOIS GAS COMPANY 
 
TO 
 
THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. 
 
TRUSTEE UNDER INDENTURE DATED AS OF 
 
JANUARY 1, 1954 
and
SUPPLEMENTAL INDENTURES THERETO 
 
____________________
FIRST MORTGAGE BONDS 2.60% SERIES DUE AUGUST 30, 2029
FIRST MORTGAGE BONDS 2.80% SERIES DUE OCTOBER 30, 2034
FIRST MORTGAGE BONDS 3.30% SERIES DUE AUGUST 30, 2049
FIRST MORTGAGE BONDS 3.40% SERIES DUE OCTOBER 30, 2059

THIS SUPPLEMENTAL INDENTURE, made as of August 14, 2019 and effective August 30, 2019, between NORTHERN ILLINOIS GAS COMPANY, a corporation organized and existing under the laws of the State of Illinois (hereinafter called the “Company”), and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. (hereinafter called the “Trustee”), as successor Trustee under an Indenture dated as of January 1, 1954, as modified by the Indenture of Adoption, dated February 9, 1954 and the Indenture of Release, dated February 9, 1954, and as supplemented by Supplemental Indentures dated (or made effective) April 1, 1956, June 1, 1959, July 1, 1960, June 1, 1963, July 1, 1963, August 1, 1964, August 1, 1965, May 1, 1966, August 1, 1966, July 1, 1967, June 1, 1968, December 1, 1969, August 1, 1970, June 1, 1971, July 1, 1972, July 1, 1973, April 1, 1975, April 30, 1976 (two Supplemental Indentures bearing that date), July 1, 1976, August 1, 1976, December 1, 1977, January 15, 1979, December 1, 1981, March 1, 1983, October 1, 1984, December 1, 1986, March 15, 1988, July 1, 1988, July 1, 1989, July 15, 1990, August 15, 1991, July 15, 1992, February 1, 1993, March 15, 1993, May 1, 1993, July 1, 1993, August 15, 1994, October 15, 1995, May 10, 1996, August 1, 1996, June 1, 1997, October 15, 1997, February 15, 1998, June 1, 1998, February 1, 1999, February 1, 2001, May 15, 2001, August 15, 2001, December 15, 2001, December 1, 2003 (three Supplemental Indentures bearing that date), December 15, 2006, August 15, 2008, July 30, 2009, February 1, 2011, October 26, 2012, June 23, 2016, August 10, 2017, and August 16, 2018, such Indenture dated as of January 1, 1954, as so modified and supplemented, being hereinafter called the “Indenture.”
WITNESSETH:
WHEREAS, the Indenture provides for the issuance from time to time thereunder, in series, of bonds of the Company for the purposes and subject to the limitations therein specified; and
WHEREAS, the Company desires, by this Supplemental Indenture, to create four additional series of bonds to be issuable under the Indenture, such bonds to be designated, respectively, (a) “First Mortgage Bonds 2.60% Series due August 30, 2029” (hereinafter called the “2029 Series”), (b) “First Mortgage Bonds 2.80% Series due October 30, 2034” (hereinafter called the “2034 Series”), (c) “First Mortgage Bonds 3.30% Series due August 30, 2049” (hereinafter called the “2049 Series”), and (d) “First Mortgage Bonds 3.40% Series due October 30, 2059” (hereinafter called the “2059 Series”; the 2029 Series, the 2034 Series, the 2049 Series and the 2059 Series, hereinafter called, collectively, the “bonds of this Supplemental Indenture”), and the terms and provisions to be contained in the bonds of this Supplemental Indenture or to be otherwise applicable thereto to be as set forth in this Supplemental Indenture; and
WHEREAS, the forms, respectively, of the bonds of this Supplemental Indenture, and the Trustee’s certificate to be endorsed on all bonds of this Supplemental Indenture, are to be substantially as follows:
[Remainder of Page Intentionally Left Blank]

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(FORM OF FACE OF BOND OF 2029 SERIES)
	
		
	NO. RU-2019-A-__
	$________

	 
	 

	Ill. Commerce Commission Nos. 6778 and 6799
	CUSIP No.___________

NORTHERN ILLINOIS GAS COMPANY 
 
First Mortgage Bond 2.60% Series due August 30, 2029
NORTHERN ILLINOIS GAS COMPANY, an Illinois corporation (hereinafter called the “Company”), for value received, hereby promises to pay to                      or registered assigns, the sum of                           Dollars, on August 30, 2029, and to pay to the registered owner hereof interest on said sum from the date hereof until said sum shall be paid, at the rate of 2.60% per annum, payable semi-annually on the fifteenth day of February and the fifteenth day of August in each year, beginning on February 15, 2020.  Both the principal of and the interest on this bond shall be payable at the office or agency of the Company in the City of Chicago, State of Illinois, or, at the option of the registered owner, at the office or agency of the Company in the Borough of Manhattan, The City and State of New York, 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.  Any installment of interest on this bond may, at the Company’s option, be paid by mailing checks for such interest payable to or upon the written order of the person entitled thereto to the address of such person as it appears on the registration books.
So long as there is no existing default in the payment of interest on this bond, the interest so payable on any interest payment date will be paid to the person in whose name this bond is registered on February 1 or August 1 (whether or not a business day), as the case may be, next preceding such interest payment date.  If and to the extent that the Company shall default in the payment of interest due on such interest payment date, such defaulted interest shall be paid to the person in whose name this bond is registered on the record date fixed, in advance, by the Company for the payment of such defaulted interest.
Additional provisions of this bond are set forth on the reverse hereof.
This bond shall not be entitled to any security or benefit under the Indenture or be valid or become obligatory for any purpose unless and until it shall have been authenticated by the execution by the Trustee, or its successor in trust under the Indenture, of the certificate endorsed hereon.

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IN WITNESS WHEREOF, Northern Illinois Gas Company has caused this bond to be executed in its name by its Executive Vice President, Chief Financial Officer and Treasurer, manually or by facsimile signature, and has caused its corporate seal to be impressed hereon or a facsimile thereof to be imprinted hereon and to be attested by its Corporate Secretary, manually or by facsimile signature.
Dated:  August 30, 2019
	
			
	 
	NORTHERN ILLINOIS GAS COMPANY

	 
	By:
	 

	 
	 
	Executive Vice President, Chief Financial Officer and Treasurer

	ATTEST:

	 
	 

	Corporate Secretary
	 
	 

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(FORM OF TRUSTEE’S CERTIFICATE OF AUTHENTICATION)
This bond is one of the bonds of the 2029 Series designated therein, referred to and described in the within-mentioned Supplemental Indenture dated as of August 14, 2019, effective August 30, 2019.
	
		
	THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., 
   TRUSTEE

	By:
	 

	 
	Authorized Officer

	

Dated: August 30, 2019

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(FORM OF REVERSE SIDE OF BOND OF 2029 SERIES)
This bond is one, of the series hereinafter specified, of the bonds issued and to be issued in series from time to time under and in accordance with and secured by an Indenture dated as of January 1, 1954, to The Bank of New York Mellon Trust Company, N.A., as Trustee, as supplemented by certain indentures supplemental thereto, executed and delivered to the Trustee; and this bond is one of a series of such bonds, designated “Northern Illinois Gas Company First Mortgage Bond 2.60% Series due August 30, 2029” (herein called “bonds of this Series”), the issuance of which is provided for by a Supplemental Indenture dated as of August 14, 2019, effective August 30, 2019 (hereinafter called the “Supplemental Indenture”), executed and delivered by the Company to the Trustee.  The term “Indenture”, as hereinafter used, means said Indenture dated as of January 1, 1954, and all indentures supplemental thereto (including, without limitation, the Supplemental Indenture) from time to time in effect.  Reference is made to the Indenture for a description of the property mortgaged and pledged, the nature and extent of the security, the rights of the holders and registered owners of said bonds, of the Company and of the Trustee in respect of the security, and the terms and conditions governing the issuance and security of said bonds.
Any transferee, by its acceptance of a bond registered in its name (or the name of its nominee), shall be deemed to have made the representation set forth in Section 6.2 of the Bond Purchase Agreement dated as of August 14, 2019 among the Company and the purchasers listed on Schedule A attached thereto, as amended, restated, supplemented or otherwise modified from time to time.
With the consent of the Company and to the extent permitted by and as provided in the Indenture, modifications or alterations of the Indenture or of any supplemental indenture and of the rights and obligations of the Company and of the holders and registered owners of the bonds may be made, and compliance with any provision of the Indenture or of any supplemental indenture may be waived, by the affirmative vote of the holders and registered owners of not less than sixty-six and two-thirds per centum (66 2/3%) in principal amount of the bonds then outstanding under the Indenture, and by the affirmative vote of the holders and registered owners of not less than sixty-six and two-thirds per centum (66 2/3%) in principal amount of the bonds of any series then outstanding under the Indenture and affected by such modification or alteration, in case one or more but less than all of the series of bonds then outstanding under the Indenture are so affected, but in any case excluding bonds disqualified from voting by reason of the Company’s interest therein as provided in the Indenture; subject, however, to the condition, among other conditions stated in the Indenture, that no such modification or alteration shall be made which, among other things, will permit the extension of the time or times of payment of the principal of or the interest or the premium, if any, on this bond, or the reduction in the principal amount hereof or in the rate of interest or the amount of any premium hereon, or any other modification in the terms of payment of such principal, interest or premium, which terms of payment are unconditional, or, otherwise than as permitted by the Indenture, the creation of any lien ranking prior to or on a parity with the lien of the Indenture with respect to any of the mortgaged property, all as more fully provided in the Indenture.

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The bonds of this Series may be called for redemption by the Company, as a whole at any time or in part from time to time, at a redemption price equal to 100% of the principal amount of the bonds of this Series to be redeemed plus accrued and unpaid interest on the principal amount being redeemed to the date of redemption and the Make-Whole Amount (as defined in the Supplemental Indenture) applicable thereto.
Notice of each redemption shall be mailed to all registered owners not less than thirty nor more than forty-five days before the redemption date.
In case of certain completed defaults specified in the Indenture, the principal of this bond may be declared or may become due and payable in the manner and with the effect provided in the Indenture.
No recourse shall be had for the payment of the principal of or the interest or the premium, if any, on this bond, or for any claim based hereon, or otherwise in respect hereof or of the Indenture, to or against any incorporator, stockholder, officer or director, past, present or future, of the Company or of any predecessor or successor corporation, either directly or through the Company or such predecessor or successor corporation, under any constitution or statute or rule of law, or by the enforcement of any assessment or penalty, or otherwise, all such liability of incorporators, stockholders, directors and officers being waived and released by the registered owner hereof by the acceptance of this bond and being likewise waived and released by the terms of the Indenture, all as more fully provided therein.
This bond is transferable by the registered owner hereof, in person or by duly authorized attorney, at the office or agency of the Company in the City of Chicago, State of Illinois, or, at the option of the registered owner, at the office or agency of the Company in the Borough of Manhattan, The City and State of New York, upon surrender and cancellation of this bond; and thereupon a new registered bond or bonds without coupons of the same aggregate principal amount and series will, upon the payment of any transfer tax or taxes payable, be issued to the transferee in exchange herefor.  The Company shall not be required to exchange or transfer this bond if this bond or a portion hereof has been selected for redemption.
The security represented by this certificate has not been registered under the Securities Act of 1933, as amended (the “Securities Act”), or qualified under any state securities laws and may not be transferred, sold or otherwise disposed of except while a registration statement is in effect or pursuant to an available exemption from registration under the Securities Act and applicable state securities laws.
(END OF FORM OF BOND OF 2029 SERIES)

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(FORM OF FACE OF BOND OF 2034 SERIES)
	
		
	NO. RU-2019-B-__
	$________

	 
	 

	Ill. Commerce Commission Nos. 6800
	CUSIP No.___________

NORTHERN ILLINOIS GAS COMPANY 
 
First Mortgage Bond 2.80% Series due October 30, 2034
NORTHERN ILLINOIS GAS COMPANY, an Illinois corporation (hereinafter called the “Company”), for value received, hereby promises to pay to                      or registered assigns, the sum of                           Dollars, on October 30, 2034, and to pay to the registered owner hereof interest on said sum from the date hereof until said sum shall be paid, at the rate of 2.80% per annum, payable semi-annually on the fifteenth day of April and the fifteenth day of October in each year, beginning on April 15, 2020.  Both the principal of and the interest on this bond shall be payable at the office or agency of the Company in the City of Chicago, State of Illinois, or, at the option of the registered owner, at the office or agency of the Company in the Borough of Manhattan, The City and State of New York, 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.  Any installment of interest on this bond may, at the Company’s option, be paid by mailing checks for such interest payable to or upon the written order of the person entitled thereto to the address of such person as it appears on the registration books.
So long as there is no existing default in the payment of interest on this bond, the interest so payable on any interest payment date will be paid to the person in whose name this bond is registered on April 1 or October 1 (whether or not a business day), as the case may be, next preceding such interest payment date.  If and to the extent that the Company shall default in the payment of interest due on such interest payment date, such defaulted interest shall be paid to the person in whose name this bond is registered on the record date fixed, in advance, by the Company for the payment of such defaulted interest.
Additional provisions of this bond are set forth on the reverse hereof.
This bond shall not be entitled to any security or benefit under the Indenture or be valid or become obligatory for any purpose unless and until it shall have been authenticated by the execution by the Trustee, or its successor in trust under the Indenture, of the certificate endorsed hereon.

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IN WITNESS WHEREOF, Northern Illinois Gas Company has caused this bond to be executed in its name by its Executive Vice President, Chief Financial Officer and Treasurer, manually or by facsimile signature, and has caused its corporate seal to be impressed hereon or a facsimile thereof to be imprinted hereon and to be attested by its Corporate Secretary, manually or by facsimile signature.
Dated:  October 30, 2019
	
			
	 
	NORTHERN ILLINOIS GAS COMPANY

	 
	By:
	 

	 
	 
	Executive Vice President, Chief Financial Officer and Treasurer

	ATTEST:

	 
	 

	Corporate Secretary
	 
	 

- 8 -

(FORM OF TRUSTEE’S CERTIFICATE OF AUTHENTICATION)
This bond is one of the bonds of the 2034 Series designated therein, referred to and described in the within-mentioned Supplemental Indenture dated as of August 14, 2019, effective August 30, 2019.
	
		
	THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., 
   TRUSTEE

	By:
	 

	 
	Authorized Officer

	

Dated: August 30, 2019

- 9 -

(FORM OF REVERSE SIDE OF BOND OF 2034 SERIES)
This bond is one, of the series hereinafter specified, of the bonds issued and to be issued in series from time to time under and in accordance with and secured by an Indenture dated as of January 1, 1954, to The Bank of New York Mellon Trust Company, N.A., as Trustee, as supplemented by certain indentures supplemental thereto, executed and delivered to the Trustee; and this bond is one of a series of such bonds, designated “Northern Illinois Gas Company First Mortgage Bond 2.80% Series due October 30, 2034” (herein called “bonds of this Series”), the issuance of which is provided for by a Supplemental Indenture dated as of August 14, 2019, effective August 30, 2019 (hereinafter called the “Supplemental Indenture”), executed and delivered by the Company to the Trustee.  The term “Indenture”, as hereinafter used, means said Indenture dated as of January 1, 1954, and all indentures supplemental thereto (including, without limitation, the Supplemental Indenture) from time to time in effect.  Reference is made to the Indenture for a description of the property mortgaged and pledged, the nature and extent of the security, the rights of the holders and registered owners of said bonds, of the Company and of the Trustee in respect of the security, and the terms and conditions governing the issuance and security of said bonds.
Any transferee, by its acceptance of a bond registered in its name (or the name of its nominee), shall be deemed to have made the representation set forth in Section 6.2 of the Bond Purchase Agreement dated as of August 14, 2019 among the Company and the purchasers listed on Schedule A attached thereto, as amended, restated, supplemented or otherwise modified from time to time.
With the consent of the Company and to the extent permitted by and as provided in the Indenture, modifications or alterations of the Indenture or of any supplemental indenture and of the rights and obligations of the Company and of the holders and registered owners of the bonds may be made, and compliance with any provision of the Indenture or of any supplemental indenture may be waived, by the affirmative vote of the holders and registered owners of not less than sixty-six and two-thirds per centum (66 2/3%) in principal amount of the bonds then outstanding under the Indenture, and by the affirmative vote of the holders and registered owners of not less than sixty-six and two-thirds per centum (66 2/3%) in principal amount of the bonds of any series then outstanding under the Indenture and affected by such modification or alteration, in case one or more but less than all of the series of bonds then outstanding under the Indenture are so affected, but in any case excluding bonds disqualified from voting by reason of the Company’s interest therein as provided in the Indenture; subject, however, to the condition, among other conditions stated in the Indenture, that no such modification or alteration shall be made which, among other things, will permit the extension of the time or times of payment of the principal of or the interest or the premium, if any, on this bond, or the reduction in the principal amount hereof or in the rate of interest or the amount of any premium hereon, or any other modification in the terms of payment of such principal, interest or premium, which terms of payment are unconditional, or, otherwise than as permitted by the Indenture, the creation of any lien ranking prior to or on a parity with the lien of the Indenture with respect to any of the mortgaged property, all as more fully provided in the Indenture.

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The bonds of this Series may be called for redemption by the Company, as a whole at any time or in part from time to time, at a redemption price equal to 100% of the principal amount of the bonds of this Series to be redeemed plus accrued and unpaid interest on the principal amount being redeemed to the date of redemption and the Make-Whole Amount (as defined in the Supplemental Indenture) applicable thereto.
Notice of each redemption shall be mailed to all registered owners not less than thirty nor more than forty-five days before the redemption date.
In case of certain completed defaults specified in the Indenture, the principal of this bond may be declared or may become due and payable in the manner and with the effect provided in the Indenture.
No recourse shall be had for the payment of the principal of or the interest or the premium, if any, on this bond, or for any claim based hereon, or otherwise in respect hereof or of the Indenture, to or against any incorporator, stockholder, officer or director, past, present or future, of the Company or of any predecessor or successor corporation, either directly or through the Company or such predecessor or successor corporation, under any constitution or statute or rule of law, or by the enforcement of any assessment or penalty, or otherwise, all such liability of incorporators, stockholders, directors and officers being waived and released by the registered owner hereof by the acceptance of this bond and being likewise waived and released by the terms of the Indenture, all as more fully provided therein.
This bond is transferable by the registered owner hereof, in person or by duly authorized attorney, at the office or agency of the Company in the City of Chicago, State of Illinois, or, at the option of the registered owner, at the office or agency of the Company in the Borough of Manhattan, The City and State of New York, upon surrender and cancellation of this bond; and thereupon a new registered bond or bonds without coupons of the same aggregate principal amount and series will, upon the payment of any transfer tax or taxes payable, be issued to the transferee in exchange herefor.  The Company shall not be required to exchange or transfer this bond if this bond or a portion hereof has been selected for redemption.
The security represented by this certificate has not been registered under the Securities Act of 1933, as amended (the “Securities Act”), or qualified under any state securities laws and may not be transferred, sold or otherwise disposed of except while a registration statement is in effect or pursuant to an available exemption from registration under the Securities Act and applicable state securities laws.
(END OF FORM OF BOND OF 2034 SERIES)

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(FORM OF FACE OF BOND OF 2049 SERIES)
	
		
	NO. RU-2019-C-__
	$________

	 
	 

	Ill. Commerce Commission Nos. 6801
	CUSIP No.___________

NORTHERN ILLINOIS GAS COMPANY 
 
First Mortgage Bond 3.30% Series due August 30, 2049
NORTHERN ILLINOIS GAS COMPANY, an Illinois corporation (hereinafter called the “Company”), for value received, hereby promises to pay to                      or registered assigns, the sum of                           Dollars, on August 30, 2049, and to pay to the registered owner hereof interest on said sum from the date hereof until said sum shall be paid, at the rate of 3.30% per annum, payable semi-annually on the fifteenth day of February and the fifteenth day of August in each year, beginning on February 15, 2020.  Both the principal of and the interest on this bond shall be payable at the office or agency of the Company in the City of Chicago, State of Illinois, or, at the option of the registered owner, at the office or agency of the Company in the Borough of Manhattan, The City and State of New York, 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.  Any installment of interest on this bond may, at the Company’s option, be paid by mailing checks for such interest payable to or upon the written order of the person entitled thereto to the address of such person as it appears on the registration books.
So long as there is no existing default in the payment of interest on this bond, the interest so payable on any interest payment date will be paid to the person in whose name this bond is registered on February 1 or August 1 (whether or not a business day), as the case may be, next preceding such interest payment date.  If and to the extent that the Company shall default in the payment of interest due on such interest payment date, such defaulted interest shall be paid to the person in whose name this bond is registered on the record date fixed, in advance, by the Company for the payment of such defaulted interest.
Additional provisions of this bond are set forth on the reverse hereof.
This bond shall not be entitled to any security or benefit under the Indenture or be valid or become obligatory for any purpose unless and until it shall have been authenticated by the execution by the Trustee, or its successor in trust under the Indenture, of the certificate endorsed hereon.

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IN WITNESS WHEREOF, Northern Illinois Gas Company has caused this bond to be executed in its name by its Executive Vice President, Chief Financial Officer and Treasurer, manually or by facsimile signature, and has caused its corporate seal to be impressed hereon or a facsimile thereof to be imprinted hereon and to be attested by its Corporate Secretary, manually or by facsimile signature.
Dated:  August 30, 2019
	
			
	 
	NORTHERN ILLINOIS GAS COMPANY

	 
	By:
	 

	 
	 
	Executive Vice President, Chief Financial Officer and Treasurer

	ATTEST:

	 
	 

	Corporate Secretary
	 
	 

- 13 -

(FORM OF TRUSTEE’S CERTIFICATE OF AUTHENTICATION)
This bond is one of the bonds of the 2049 Series designated therein, referred to and described in the within-mentioned Supplemental Indenture dated as of August 14, 2019, effective August 30, 2019.
	
		
	THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., 
   TRUSTEE

	By:
	 

	 
	Authorized Officer

	

Dated: August 30, 2019

- 14 -

(FORM OF REVERSE SIDE OF BOND OF 2049 SERIES)
This bond is one, of the series hereinafter specified, of the bonds issued and to be issued in series from time to time under and in accordance with and secured by an Indenture dated as of January 1, 1954, to The Bank of New York Mellon Trust Company, N.A., as Trustee, as supplemented by certain indentures supplemental thereto, executed and delivered to the Trustee; and this bond is one of a series of such bonds, designated “Northern Illinois Gas Company First Mortgage Bond 3.30% Series due August 30, 2049” (herein called “bonds of this Series”), the issuance of which is provided for by a Supplemental Indenture dated as of August 14, 2019, effective August 30, 2019 (hereinafter called the “Supplemental Indenture”), executed and delivered by the Company to the Trustee.  The term “Indenture”, as hereinafter used, means said Indenture dated as of January 1, 1954, and all indentures supplemental thereto (including, without limitation, the Supplemental Indenture) from time to time in effect.  Reference is made to the Indenture for a description of the property mortgaged and pledged, the nature and extent of the security, the rights of the holders and registered owners of said bonds, of the Company and of the Trustee in respect of the security, and the terms and conditions governing the issuance and security of said bonds.
Any transferee, by its acceptance of a bond registered in its name (or the name of its nominee), shall be deemed to have made the representation set forth in Section 6.2 of the Bond Purchase Agreement dated as of August 14, 2019 among the Company and the purchasers listed on Schedule A attached thereto, as amended, restated, supplemented or otherwise modified from time to time.
With the consent of the Company and to the extent permitted by and as provided in the Indenture, modifications or alterations of the Indenture or of any supplemental indenture and of the rights and obligations of the Company and of the holders and registered owners of the bonds may be made, and compliance with any provision of the Indenture or of any supplemental indenture may be waived, by the affirmative vote of the holders and registered owners of not less than sixty-six and two-thirds per centum (66 2/3%) in principal amount of the bonds then outstanding under the Indenture, and by the affirmative vote of the holders and registered owners of not less than sixty-six and two-thirds per centum (66 2/3%) in principal amount of the bonds of any series then outstanding under the Indenture and affected by such modification or alteration, in case one or more but less than all of the series of bonds then outstanding under the Indenture are so affected, but in any case excluding bonds disqualified from voting by reason of the Company’s interest therein as provided in the Indenture; subject, however, to the condition, among other conditions stated in the Indenture, that no such modification or alteration shall be made which, among other things, will permit the extension of the time or times of payment of the principal of or the interest or the premium, if any, on this bond, or the reduction in the principal amount hereof or in the rate of interest or the amount of any premium hereon, or any other modification in the terms of payment of such principal, interest or premium, which terms of payment are unconditional, or, otherwise than as permitted by the Indenture, the creation of any lien ranking prior to or on a parity with the lien of the Indenture with respect to any of the mortgaged property, all as more fully provided in the Indenture.
The bonds of this Series may be called for redemption by the Company, as a whole at any time or in part from time to time, at a redemption price equal to 100% of the principal amount of 

- 15 -

the bonds of this Series to be redeemed plus accrued and unpaid interest on the principal amount being redeemed to the date of redemption and the Make-Whole Amount (as defined in the Supplemental Indenture) applicable thereto.
Notice of each redemption shall be mailed to all registered owners not less than thirty nor more than forty-five days before the redemption date.
In case of certain completed defaults specified in the Indenture, the principal of this bond may be declared or may become due and payable in the manner and with the effect provided in the Indenture.
No recourse shall be had for the payment of the principal of or the interest or the premium, if any, on this bond, or for any claim based hereon, or otherwise in respect hereof or of the Indenture, to or against any incorporator, stockholder, officer or director, past, present or future, of the Company or of any predecessor or successor corporation, either directly or through the Company or such predecessor or successor corporation, under any constitution or statute or rule of law, or by the enforcement of any assessment or penalty, or otherwise, all such liability of incorporators, stockholders, directors and officers being waived and released by the registered owner hereof by the acceptance of this bond and being likewise waived and released by the terms of the Indenture, all as more fully provided therein.
This bond is transferable by the registered owner hereof, in person or by duly authorized attorney, at the office or agency of the Company in the City of Chicago, State of Illinois, or, at the option of the registered owner, at the office or agency of the Company in the Borough of Manhattan, The City and State of New York, upon surrender and cancellation of this bond; and thereupon a new registered bond or bonds without coupons of the same aggregate principal amount and series will, upon the payment of any transfer tax or taxes payable, be issued to the transferee in exchange herefor.  The Company shall not be required to exchange or transfer this bond if this bond or a portion hereof has been selected for redemption.
The security represented by this certificate has not been registered under the Securities Act of 1933, as amended (the “Securities Act”), or qualified under any state securities laws and may not be transferred, sold or otherwise disposed of except while a registration statement is in effect or pursuant to an available exemption from registration under the Securities Act and applicable state securities laws.
(END OF FORM OF BOND OF 2049 SERIES)

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(FORM OF FACE OF BOND OF 2059 SERIES)
	
		
	NO. RU-2019-D-__
	$________

	 
	 

	Ill. Commerce Commission Nos. 6802
	CUSIP No.___________

NORTHERN ILLINOIS GAS COMPANY 
 
First Mortgage Bond 3.40% Series due October 30, 2059
NORTHERN ILLINOIS GAS COMPANY, an Illinois corporation (hereinafter called the “Company”), for value received, hereby promises to pay to                      or registered assigns, the sum of                           Dollars, on October 30, 2059, and to pay to the registered owner hereof interest on said sum from the date hereof until said sum shall be paid, at the rate of 3.40% per annum, payable semi-annually on the fifteenth day of April and the fifteenth day of October in each year, beginning on April 15, 2020.  Both the principal of and the interest on this bond shall be payable at the office or agency of the Company in the City of Chicago, State of Illinois, or, at the option of the registered owner, at the office or agency of the Company in the Borough of Manhattan, The City and State of New York, 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.  Any installment of interest on this bond may, at the Company’s option, be paid by mailing checks for such interest payable to or upon the written order of the person entitled thereto to the address of such person as it appears on the registration books.
So long as there is no existing default in the payment of interest on this bond, the interest so payable on any interest payment date will be paid to the person in whose name this bond is registered on April 1 or October 1 (whether or not a business day), as the case may be, next preceding such interest payment date.  If and to the extent that the Company shall default in the payment of interest due on such interest payment date, such defaulted interest shall be paid to the person in whose name this bond is registered on the record date fixed, in advance, by the Company for the payment of such defaulted interest.
Additional provisions of this bond are set forth on the reverse hereof.
This bond shall not be entitled to any security or benefit under the Indenture or be valid or become obligatory for any purpose unless and until it shall have been authenticated by the execution by the Trustee, or its successor in trust under the Indenture, of the certificate endorsed hereon.

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IN WITNESS WHEREOF, Northern Illinois Gas Company has caused this bond to be executed in its name by its Executive Vice President, Chief Financial Officer and Treasurer, manually or by facsimile signature, and has caused its corporate seal to be impressed hereon or a facsimile thereof to be imprinted hereon and to be attested by its Corporate Secretary, manually or by facsimile signature.
Dated:  October 30, 2019
	
			
	 
	NORTHERN ILLINOIS GAS COMPANY

	 
	By:
	 

	 
	 
	Executive Vice President, Chief Financial Officer and Treasurer

	ATTEST:

	 
	 

	Corporate Secretary
	 
	 

- 18 -

(FORM OF TRUSTEE’S CERTIFICATE OF AUTHENTICATION)
This bond is one of the bonds of the 2059 Series designated therein, referred to and described in the within-mentioned Supplemental Indenture dated as of August 14, 2019, effective August 30, 2019.
	
		
	THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., 
   TRUSTEE

	By:
	 

	 
	Authorized Officer

	

Dated: August 30, 2019

- 19 -

(FORM OF REVERSE SIDE OF BOND OF 2059 SERIES)
This bond is one, of the series hereinafter specified, of the bonds issued and to be issued in series from time to time under and in accordance with and secured by an Indenture dated as of January 1, 1954, to The Bank of New York Mellon Trust Company, N.A., as Trustee, as supplemented by certain indentures supplemental thereto, executed and delivered to the Trustee; and this bond is one of a series of such bonds, designated “Northern Illinois Gas Company First Mortgage Bond 3.40% Series due October 30, 2059” (herein called “bonds of this Series”), the issuance of which is provided for by a Supplemental Indenture dated as of August 14, 2019, effective August 30, 2019 (hereinafter called the “Supplemental Indenture”), executed and delivered by the Company to the Trustee.  The term “Indenture”, as hereinafter used, means said Indenture dated as of January 1, 1954, and all indentures supplemental thereto (including, without limitation, the Supplemental Indenture) from time to time in effect.  Reference is made to the Indenture for a description of the property mortgaged and pledged, the nature and extent of the security, the rights of the holders and registered owners of said bonds, of the Company and of the Trustee in respect of the security, and the terms and conditions governing the issuance and security of said bonds.
Any transferee, by its acceptance of a bond registered in its name (or the name of its nominee), shall be deemed to have made the representation set forth in Section 6.2 of the Bond Purchase Agreement dated as of August 14, 2019 among the Company and the purchasers listed on Schedule A attached thereto, as amended, restated, supplemented or otherwise modified from time to time.
With the consent of the Company and to the extent permitted by and as provided in the Indenture, modifications or alterations of the Indenture or of any supplemental indenture and of the rights and obligations of the Company and of the holders and registered owners of the bonds may be made, and compliance with any provision of the Indenture or of any supplemental indenture may be waived, by the affirmative vote of the holders and registered owners of not less than sixty-six and two-thirds per centum (66 2/3%) in principal amount of the bonds then outstanding under the Indenture, and by the affirmative vote of the holders and registered owners of not less than sixty-six and two-thirds per centum (66 2/3%) in principal amount of the bonds of any series then outstanding under the Indenture and affected by such modification or alteration, in case one or more but less than all of the series of bonds then outstanding under the Indenture are so affected, but in any case excluding bonds disqualified from voting by reason of the Company’s interest therein as provided in the Indenture; subject, however, to the condition, among other conditions stated in the Indenture, that no such modification or alteration shall be made which, among other things, will permit the extension of the time or times of payment of the principal of or the interest or the premium, if any, on this bond, or the reduction in the principal amount hereof or in the rate of interest or the amount of any premium hereon, or any other modification in the terms of payment of such principal, interest or premium, which terms of payment are unconditional, or, otherwise than as permitted by the Indenture, the creation of any lien ranking prior to or on a parity with the lien of the Indenture with respect to any of the mortgaged property, all as more fully provided in the Indenture.

- 20 -

The bonds of this Series may be called for redemption by the Company, as a whole at any time or in part from time to time, at a redemption price equal to 100% of the principal amount of the bonds of this Series to be redeemed plus accrued and unpaid interest on the principal amount being redeemed to the date of redemption and the Make-Whole Amount (as defined in the Supplemental Indenture) applicable thereto.
Notice of each redemption shall be mailed to all registered owners not less than thirty nor more than forty-five days before the redemption date.
In case of certain completed defaults specified in the Indenture, the principal of this bond may be declared or may become due and payable in the manner and with the effect provided in the Indenture.
No recourse shall be had for the payment of the principal of or the interest or the premium, if any, on this bond, or for any claim based hereon, or otherwise in respect hereof or of the Indenture, to or against any incorporator, stockholder, officer or director, past, present or future, of the Company or of any predecessor or successor corporation, either directly or through the Company or such predecessor or successor corporation, under any constitution or statute or rule of law, or by the enforcement of any assessment or penalty, or otherwise, all such liability of incorporators, stockholders, directors and officers being waived and released by the registered owner hereof by the acceptance of this bond and being likewise waived and released by the terms of the Indenture, all as more fully provided therein.
This bond is transferable by the registered owner hereof, in person or by duly authorized attorney, at the office or agency of the Company in the City of Chicago, State of Illinois, or, at the option of the registered owner, at the office or agency of the Company in the Borough of Manhattan, The City and State of New York, upon surrender and cancellation of this bond; and thereupon a new registered bond or bonds without coupons of the same aggregate principal amount and series will, upon the payment of any transfer tax or taxes payable, be issued to the transferee in exchange herefor.  The Company shall not be required to exchange or transfer this bond if this bond or a portion hereof has been selected for redemption.
The security represented by this certificate has not been registered under the Securities Act of 1933, as amended (the “Securities Act”), or qualified under any state securities laws and may not be transferred, sold or otherwise disposed of except while a registration statement is in effect or pursuant to an available exemption from registration under the Securities Act and applicable state securities laws.
(END OF FORM OF BOND OF 2059 SERIES)
and
WHEREAS, all acts and things necessary to make this Supplemental Indenture, when duly executed and delivered, a valid, binding and legal instrument in accordance with its terms, and for the purposes herein expressed, have been done and performed, and the execution and delivery of this Supplemental Indenture have in all respects been duly authorized.

- 21 -

NOW THEREFORE, in consideration of the premises and of the sum of one dollar paid by the Trustee to the Company, and for other good and valuable consideration, the receipt of which is hereby acknowledged, for the purpose of securing the due and punctual payment of the principal of and the interest and premium, if any, on all bonds which shall be issued under the Indenture, and for the purpose of securing the faithful performance and observance of all the covenants and conditions set forth in the Indenture and in all indentures supplemental thereto, the Company by these presents does grant, bargain, sell, transfer, assign, pledge, mortgage, warrant and convey unto The Bank of New York Mellon Trust Company, N.A., as Trustee, and its successor or successors in the trust hereby created, all property, real and personal (other than property expressly excepted from the lien and operation of the Indenture), which, at the actual date of execution and delivery of this Supplemental Indenture, is solely used or held for use in the operation by the Company of its gas utility system and in the conduct of its gas utility business and all property, real and personal, used or useful in the gas utility business (other than property expressly excepted from the lien and operation of the Indenture) acquired by the Company after the actual date of execution and delivery of this Supplemental Indenture or (subject to the provisions of Section 16.03 of the Indenture) by any successor corporation after such execution and delivery, and it is further agreed by and between the Company and the Trustee as follows:
ARTICLE I. 
 
BONDS OF THIS SUPPLEMENTAL INDENTURE
Section 1.    The bonds of this Supplemental Indenture shall, as hereinbefore recited, be designated as the Company’s (a) “First Mortgage Bonds 2.60% Series due August 30, 2029”, (b) “First Mortgage Bonds 2.80% Series due October 30, 2034”, (c) “First Mortgage Bonds 3.30% Series due August 30, 2049”, and (d) “First Mortgage Bonds 3.40% Series due October 30, 2059”, as applicable.  The bonds of the 2029 Series which may be issued and outstanding shall not exceed $100,000,000 in aggregate principal amount, exclusive of bonds of such series authenticated and delivered pursuant to Section 4.12 of the Indenture.  The bonds of the 2034 Series which may be issued and outstanding shall not exceed $50,000,000 in aggregate principal amount, exclusive of bonds of such series authenticated and delivered pursuant to Section 4.12 of the Indenture.  The bonds of the 2049 Series which may be issued and outstanding shall not exceed $100,000,000 in aggregate principal amount, exclusive of bonds of such series authenticated and delivered pursuant to Section 4.12 of the Indenture.  The bonds of the 2059 Series which may be issued and outstanding shall not exceed $50,000,000 in aggregate principal amount, exclusive of bonds of such series authenticated and delivered pursuant to Section 4.12 of the Indenture.
Section 2.    The bonds of this Supplemental Indenture shall be registered bonds without coupons, and the form of each series of such bonds, and of the Trustee’s certificate of authentication to be endorsed on all bonds of this Supplemental Indenture, shall be substantially as hereinbefore recited, respectively.
Section 3.    The bonds of this Supplemental Indenture shall be issued in the denomination of $500,000 each and in such integral multiple or multiples thereof as shall be determined and authorized by the Board of Directors of the Company or by any officer of the Company 

- 22 -

authorized by the Board of Directors to make such determination, the authorization of the denomination of any bond to be conclusively evidenced by the execution thereof on behalf of the Company.  The bonds of the 2029 Series shall be numbered RU-2019-A-1 and consecutively upwards, or in such other appropriate manner as shall be determined and authorized by the Board of Directors of the Company. The bonds of the 2034 Series shall be numbered RU-2019-B-1 and consecutively upwards, or in such other appropriate manner as shall be determined and authorized by the Board of Directors of the Company. The bonds of the 2049 Series shall be numbered RU-2019-C-1 and consecutively upwards, or in such other appropriate manner as shall be determined and authorized by the Board of Directors of the Company.  The bonds of the 2059 Series shall be numbered RU-2019-D-1 and consecutively upwards, or in such other appropriate manner as shall be determined and authorized by the Board of Directors of the Company.
The bonds of the 2029 Series and the 2049 Series shall be dated August 30, 2019, except that each bond issued on or after the respective first payment of interest thereon shall be dated as of the date of the interest payment date thereof to which interest shall have been paid on the bonds of such series next preceding the date of issue, unless issued on an interest payment date to which interest shall have been so paid, in which event such bonds shall be dated as of the date of issue; provided, however, that bonds issued on or after February 1 and before the next succeeding February 15 or on or after August 1 and before the next succeeding August 15 shall be dated the next succeeding interest payment date if interest shall have been paid to such date.  The bonds of the 2034 Series and the 2059 Series shall be dated October 30, 2019, except that each bond issued on or after the respective first payment of interest thereon shall be dated as of the date of the interest payment date thereof to which interest shall have been paid on the bonds of such series next preceding the date of issue, unless issued on an interest payment date to which interest shall have been so paid, in which event such bonds shall be dated as of the date of issue; provided, however, that bonds issued on or after April 1 and before the next succeeding April 15 or on or after October 1 and before the next succeeding October 15 shall be dated the next succeeding interest payment date if interest shall have been paid to such date.  The bonds of the 2029 Series shall mature on August 30, 2029 and shall bear interest at the rate of 2.60% per annum until the principal thereof shall be paid.  The bonds of the 2034 Series shall mature on October 30, 2034 and shall bear interest at the rate of 2.80% per annum until the principal thereof shall be paid.  The bonds of the 2049 Series shall mature on August 30, 2049 and shall bear interest at the rate of 3.30% per annum until the principal thereof shall be paid.  The bonds of the 2059 Series shall mature on October 30, 2059 and shall bear interest at the rate of 3.40% per annum until the principal thereof shall be paid.  Interest on the bonds of this Supplemental Indenture shall be calculated on the basis of a 360-day year consisting of twelve 30-day months.  Interest on the bonds of the 2029 Series shall be payable semi-annually on the fifteenth day of February and the fifteenth day of August in each year, beginning February 15, 2020.  Interest on the bonds of the 2034 Series shall be payable semi-annually on the fifteenth day of April and the fifteenth day of October in each year, beginning April 15, 2020.  Interest on the bonds of the 2049 Series shall be payable semi-annually on the fifteenth day of February and the fifteenth day of August in each year, beginning February 15, 2020.  Interest on the bonds of the 2059 Series shall be payable semi-annually on the fifteenth day of April and the fifteenth day of October in each year, beginning April 15, 2020.  So long as there is no existing default in the payment of interest on the bonds of this Supplemental Indenture, such interest shall be payable to the person in whose name each such bond is registered on the respective record date (whether or not a business day), as the case may be, next preceding the respective interest payment dates; 

- 23 -

provided, however, if and to the extent that the Company shall default in the payment of interest due on such interest payment date, such defaulted interest shall be paid to the person in whose name each such bond is registered on the record date fixed, in advance, by the Company for the payment of such defaulted interest.  Interest will accrue on overdue interest installments at the rate of (i) 2.60% per annum, with respect to the bonds of the 2029 Series, (ii) 2.80% per annum, with respect to the bonds of the 2034 Series, (iii) 3.30% per annum, with respect to the bonds of the 2049 Series, and (iv) 3.40% per annum, with respect to the bonds of the 2059 Series.
The principal of and interest and premium, if any, on the bonds of this Supplemental Indenture shall be payable 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, and shall be payable at the office or agency of the Company in the City of Chicago, State of Illinois, or, at the option of the registered owner, at the office or agency of the Company in the Borough of Manhattan, The City and State of New York.  Any installment of interest on the bonds of this Supplemental Indenture may, at the Company’s option, be paid by mailing checks for such interest payable to or upon the written order of the person entitled thereto to the address of such person as it appears on the registration books.  The bonds of this Supplemental Indenture shall be registrable, transferable and exchangeable in the manner provided in Sections 4.08 and 4.09 of the Indenture, at either of such offices or agencies.
Section 4.    The bonds of this Supplemental Indenture, upon the mailing of notice and in the manner provided in Section 7.01 of the Indenture (except that no published notice shall be required for the bonds of this Supplemental Indenture) and with the effect provided in Section 7.02 thereof, shall be redeemable at the option of the Company, as a whole at any time or in part from time to time, at a redemption price equal to 100% of the principal amount of the bonds of this Supplemental Indenture to be redeemed plus accrued and unpaid interest of the principal amount being redeemed to the date of redemption plus the Make-Whole Amount applicable thereto, as calculated by the Company.  “Make-Whole Amount” means, with respect to any bond of this Supplemental Indenture, an amount equal to the excess, if any, of the Discounted Value of the Remaining Scheduled Payments with respect to the Called Principal of such bond of this Supplemental Indenture over the amount of such Called Principal, provided that the Make-Whole Amount may in no event be less than zero.  For the purposes of determining the Make-Whole Amount, the following terms have the following meanings:
“Called Principal” means, with respect to any bond of this Supplemental Indenture, the principal of such bond of this Supplemental Indenture that is to be redeemed.
“Discounted Value” means, with respect to the Called Principal of any bond of this Supplemental Indenture, the amount obtained by discounting all Remaining Scheduled Payments with respect to such Called Principal from their respective scheduled due dates to the Settlement Date with respect to such Called Principal, in accordance with accepted financial practice and at a discount factor (applied on the same periodic basis as that on which interest on the bond of this Supplemental Indenture is payable) equal to the Reinvestment Yield with respect to such Called Principal.

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“Reinvestment Yield” means, with respect to the Called Principal of any bond of this Supplemental Indenture, the sum of (x) 0.50% plus (y) the yield to maturity implied by the “Ask Yield(s)” reported as of 10:00 a.m. (New York City time) on the second Business Day preceding the Settlement Date with respect to such Called Principal, on the display designated as “Page PX1” (or such other display as may replace Page PX1) on Bloomberg Financial Markets for the most recently issued actively traded on-the-run U.S. Treasury securities (“Reported”) having a maturity equal to the Remaining Average Life of such Called Principal as of such Settlement Date.  If there are no such U.S. Treasury securities Reported having a maturity equal to such Remaining Average Life, then such implied yield to maturity will be determined by (a) converting U.S. Treasury bill quotations to bond equivalent yields in accordance with accepted financial practice and (b) interpolating linearly between the “Ask Yields” Reported for the applicable most recently issued actively traded on-the-run U.S. Treasury securities with the maturities (1) closest to and greater than such Remaining Average Life and (2) closest to and less than such Remaining Average Life.  The Reinvestment Yield shall be rounded to the number of decimal places as appears in the interest rate of the applicable bond.
If such yields are not Reported or the yields Reported as of such time are not ascertainable (including by way of interpolation), then “Reinvestment Yield” means, with respect to the Called Principal of any bond of this Supplemental Indenture, the sum of (x) 0.50% plus (y) the yield to maturity implied by the U.S. Treasury constant maturity yields reported, for the latest day for which such yields have been so reported as of the second Business Day preceding the Settlement Date with respect to such Called Principal, in Federal Reserve Statistical Release H.15 (or any comparable successor publication) for the U.S. Treasury constant maturity having a term equal to the Remaining Average Life of such Called Principal as of such Settlement Date.  If there is no such U.S. Treasury constant maturity having a term equal to such Remaining Average Life, such implied yield to maturity will be determined by interpolating linearly between (1) the U.S. Treasury constant maturity so reported with the term closest to and greater than such Remaining Average Life and (2) the U.S. Treasury constant maturity so reported with the term closest to and less than such Remaining Average Life.  The Reinvestment Yield shall be rounded to the number of decimal places as appears in the interest rate of the applicable bond.
“Remaining Average Life” means, with respect to any Called Principal, the number of years obtained by dividing (a) such Called Principal into (b) the sum of the products obtained by multiplying (1) the principal component of each Remaining Scheduled Payment with respect to such Called Principal by (2) the number of years, computed on the basis of a 360-day year comprised of twelve 30-day months and calculated to the nearest two decimal places, that will elapse between the Settlement Date with respect to such Called Principal and the scheduled due date of such Remaining Scheduled Payment.
“Remaining Scheduled Payments” means, with respect to the Called Principal of any bond of this Supplemental Indenture, all payments of such Called Principal and interest thereon that would be due after the Settlement Date with respect to such Called Principal if no payment of such Called Principal were made prior to its scheduled due 

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date, provided that if such Settlement Date is not a date on which interest payments are due to be made under the terms of the bond of this Supplemental Indenture, then the amount of the next succeeding scheduled interest payment will be reduced by the amount of interest accrued to such Settlement Date and required to be paid on such Settlement Date pursuant to the terms of this Supplemental Indenture.
“Settlement Date” means, with respect to the Called Principal of any bond of this Supplemental Indenture, the date on which such Called Principal is to be redeemed.
Section 5.    No sinking fund is to be provided for the bonds of this Supplemental Indenture.
ARTICLE II 
 
MISCELLANEOUS PROVISIONS
Section 1.    This Supplemental Indenture is executed by the Company and the Trustee pursuant to the provisions of Section 4.02 of the Indenture and the terms and conditions hereof shall be deemed to be a part of the terms and conditions of the Indenture for any and all purposes.  The Indenture, as heretofore modified and supplemented and as supplemented by this Supplemental Indenture, is in all respects ratified and confirmed.
Section 2.    This Supplemental Indenture shall bind and, subject to the provisions of Article XVI of the Indenture, inure to the benefit of the respective successors and assigns of the parties hereto.
Section 3.    Although this Supplemental Indenture is made as of August 14, 2019, effective August 30, 2019, it shall be effective only from and after the actual time of its execution and delivery by the Company and the Trustee on the date indicated by their respective acknowledgements hereto.
Section 4.    This Supplemental Indenture may be simultaneously executed in any number of counterparts, and all such counterparts executed and delivered, each as an original, shall constitute but one and the same instrument.
Section 5.    The recitals herein are deemed to be those of the Company and not of the Trustee.  The Trustee makes no representations as to the validity or sufficiency of this Supplemental Indenture.

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IN WITNESS WHEREOF, Northern Illinois Gas Company has caused this Supplemental Indenture to be executed in its name by its Executive Vice President, Chief Financial Officer and Treasurer and its corporate seal to be hereunto affixed and attested by its Corporate Secretary, and The Bank of New York Mellon Trust Company, N.A., as Trustee under the Indenture, has caused this Supplemental Indenture to be executed in its name by one of its Vice Presidents, and its seal to be hereunto affixed and attested by one of its Vice Presidents, all as of the day and year first above written.
	
					
	NORTHERN ILLINOIS GAS COMPANY

	 
	 
	 

	By:
	/s/Daniel S. Tucker
	 
	 
	 

	 
	Name: Daniel S. Tucker
Title:   Executive Vice President, Chief Financial Officer and Treasurer
	 
	 
	 

	 
	 
	 
	 
	 

	 
	 
	 
	ATTEST:

	 
	 
	 
	By:
	/s/Barbara P. Christopher

	 
	 
	 
	 
	Name: Barbara P. Christopher 
Title:  Corporate Secretary

	 
	 
	 
	 
	[SEAL]

[Signature Page to 2019 Supplemental Indenture]

	
					
	THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.,
   as Trustee

	 
	 
	 

	By:
	/s/Karen Yu
	 
	 
	 

	 
	Name:  Karen Yu
Title:    Vice President
	 
	 
	 

	 
	[SEAL]
	 
	 
	 

	 
	 
	 
	ATTEST:

	 
	 
	 
	By:
	/s/Fanny Chen

	 
	 
	 
	 
	Name: Fanny Chen 
Title:   Vice President

[Signature Page to 2019 Supplemental Indenture]

STATE OF GEORGIA     }    SS:
COUNTY OF HENRY    }

I, Brenda G. Davis, a Notary Public in the State aforesaid, DO HEREBY CERTIFY that Daniel S. Tucker, Executive Vice President, Chief Financial Officer and Treasurer of Northern Illinois Gas Company, an Illinois corporation, one of the parties described in and which executed the foregoing instrument, and Barbara P. Christopher, Corporate Secretary of said corporation, who are both personally known to me to be the same persons whose names are subscribed to the foregoing instrument as such Executive Vice President, Chief Financial Officer and Treasurer and Corporate Secretary, respectively, and who are both personally known to me to be the Executive Vice President, Chief Financial Officer and Treasurer and Corporate Secretary, respectively, of said corporation, appeared before me this day in person and severally acknowledged that they signed, sealed, executed and delivered said instrument as their free and voluntary act as such Executive Vice President, Chief Financial Officer and Treasurer and Corporate Secretary, respectively, of said corporation, and as the free and voluntary act of said corporation, for the uses and purposes therein set forth.
GIVEN under my hand and notarial seal as of the date listed below.
Dated: August 14, 2019
	
		
	 
	/s/ Brenda G. Davis   

	 
	   Notary Public

My Commission expires: August 17, 2021.
	
		
	 
	[SEAL]

ACKNOWLEDGMENT 

	
	
	A notary public or other officer completing this certificate verifies only the identity of the individual who signed the document to which this certificate is attached, and not the truthfulness, accuracy, or validity of that document.

State of California
County of  Los Angeles        )

On   August 12, 2019         before me,  Alex Dominguez, Notary Public        
                                              (insert name and title of the officer)
personally appeared Karen Yu and Fanny Chen                ,
who proved to me on the basis of satisfactory evidence to be the person(s) whose name(s) are subscribed to the within instrument and acknowledged to me that they executed the same in their authorized capacity(ies), and that by their signature(s) on the instrument the person(s), or the entity upon behalf of which the person(s) acted, executed the instrument.

I certify under PENALTY OF PERJURY under the laws of the State of California that the foregoing paragraph is true and correct.

WITNESS my hand and official seal.

Signature   /s/ Alex Dominguez                 (Seal)

RECORDING DATA1 
This Supplemental Indenture was recorded on the following dates in the office of the Recorder of Deeds in certain counties in the State of Illinois, as follows:
	
			
	County
	Document No. 2
	Date Recorded

	Cook
	1923116023
	08/19/2019

	Adams
	2019R-05408
	08/19/2019

	Boone
	2019R04994
	08/19/2019

	Bureau
	2019R03023
	08/19/2019

	Carroll
	2019R-1568
	08/19/2019

	Champaign
	2019R13292
	08/19/2019

	DeKalb
	2019007351
	08/19/2019

	DeWitt
	255066
	08/19/2019

	DuPage
	R2019-071648
	08/20/2019

	Ford
	271607
	08/20/2019

	Grundy
	586526
	08/19/2019

	Hancock
	19-1969
	08/22/2019

	Henderson
	2019181097
	08/21/2019

	Henry
	20-1904194
	08/19/2019

	Iroquois
	19R2424
	08/20/2019

	Jo Daviess
	404591
	08/19/2019

	Kane
	2019K037432
	08/19/2019

	Kankakee
	201908980
	08/19/2019

	Kendall
	201900011709
	08/20/2019

	Lake
	7586065
	08/21/2019

	LaSalle
	2019-10461
	08/21/2019

	Lee
	2019003080
	08/20/2019

	Livingston
	2019R-03186
	08/20/2019

	McHenry
	2019R0026456
	08/19/2019

	McLean
	2019-00013241
	08/19/2019

	Mercer
	397025
	08/20/2019

	Ogle
	201904552
	08/19/2019

	Piatt
	368377
	08/20/2019

	Pike
	BOOK 883 PAGE 61
	08/21/2019

	Rock Island
	2019-11582
	08/19/2019

	Stephenson
	201900170874
	08/19/2019

	Tazewell
	201900010792
	08/19/2019

	Vermillion
	19-04920
	08/20/2019

	Whiteside
	201904422
	08/19/2019

	Will
	R2019055292
	08/20/2019

	Winnebago
	20191027833
	08/19/2019

	Woodford
	1903190
	08/19/2019

______________________________
1   This page to be intentionally omitted from versions submitted for recording.
2   For delivery at Closing, Nicor to include all document numbers received prior to Closing.  With respect to recordings for which no document number shall have been received prior to Closing, Nicor to provide such numbers post Closing.Exhibit

Exhibit 10(a)23
SIXTH AMENDMENT TO THE SOUTHERN COMPANY 
SUPPLEMENTAL BENEFIT PLAN
WHEREAS, Southern Company Services, Inc. heretofore established and adopted the Southern Company Supplemental Benefit Plan, as amended and restated effective June 30, 2016 (the “Plan”); 
WHEREAS, under Section 6.2 of the Plan, the Benefits Administration Committee (“Administrative Committee”) may amend the Plan, provided the amendment either (a) does not involve a substantial increase in cost to any Employing Company (as defined in the Plan), or (b) is necessary, proper, or desirable in order to comply with applicable laws or regulations enacted or promulgated by any federal or state governmental authority; and
WHEREAS, the Administrative Committee by the Resolution on November 8, 2019 has determined it is appropriate to amend the Plan to reflect the new method of allocating Pension Benefit liability for Participants who have been employed by more than one Employing Company.
NOW, THEREFORE, effective as of January 1, 2019, the Plan is hereby amended as follows:
1.
The Plan is hereby amended by deleting Section 5.6 in its entirety and replacing it with the following:
5.6.    Allocation of Pension Benefit Liability.  If a Participant entitled to a Pension Benefit has been employed by more than one Employing Company, then the Employing Company that employed the Participant as of the date of his Separation from Service, as determined by the Administrative Committee, will be responsible for payment of the entire Pension Benefit liability to such Participant.  However, settlement of obligations of the Pension Benefit liability for Participants who transfer employment shall occur among the Employing Companies using the methods described in this Section 5.6.
(a)    Transfers On or After January 1, 2019.  With respect to a Participant with a Pension Benefit who transfers employment from one Employing Company to another Employing Company on or after January 1, 2019, the prior Employing Company shall be responsible for paying the Participant’s Pension Benefit earned through the date of the Participant’s transfer.  
(1)  Calculation.  The amount of money to be transferred to the new Employing Company by the prior Employing Company as payment for the transferred liability shall be the Participant’s accumulated benefit obligation under Accounting Standards Codification Section 715 as of December 31 of the year during which he transfers employment, using data, assumptions, methods, 

and Plan provisions as of the applicable ASC 715 measurement date.  
(2)    Transfer of Pension Benefit Liability.  The Pension Benefit liability for such Participant will be transferred from the prior Employing Company to the Participant’s new Employing Company in the Plan Year following the year in which the Participant’s employment transfer occurs, or as soon as administratively feasible thereafter, using the method described in this paragraph (a).
(3)    Payment.  Payment of the amount described in paragraph (a)(2) will be made by the Employing Company at which the Participant was employed immediately prior to his date of transfer to the Employing Company to which the Participant’s employment is transferred as soon as administratively feasible following completion of the calculation described in paragraph (a)(2).  A transferring Employing Company’s share of a Participant’s Pension Benefit liability will be adjusted with interest from the date liability for the Participant’s Pension Benefit is transferred to his new Employing Company to the date his Pension Benefit liability is settled with such new Employing Company.  For purposes of this paragraph (a)(3), the interest rate shall be the 30-year Treasury yield as published by the Department of Treasury for purposes of compliance with Code Section 417(e) determined for September of the calendar year preceding the year in which the transfer of Pension Benefit liability occurs.
(b)    Transfers Prior to January 1, 2019.  With respect to a Participant with a Pension Benefit who transferred employment from one or more Employing Companies to another prior to January 1, 2019 and who has not commenced payment of his Pension Benefit, either his current Employing Company or his Employing Company as of the date of his Separation from Service, as applicable, shall be responsible for paying his Pension Benefit.  
(1)  Calculation.  Each Employing Company’s share of the Pension Benefit liability for a Participant who transferred employment or Separated from Service prior to January 1, 2019, shall be calculated by multiplying (A) the accumulated benefit obligation of the Participant under Accounting Standards Codification Section 715 as of December 31, 2018, by (B) a fraction where the numerator of such fraction is the Participant’s base rate of pay, as defined by the Administrative Committee, received by the Participant at the respective Employing Company as of his date of his Separation from Service or transfer of employment, as applicable, multiplied by the Accredited Service 

2

earned by the Participant at the respective Employing Company and where the denominator of such fraction is the sum of all numerators calculated for each respective Employing Company by which the Participant has been employed.  
(2)    Settlement of Pension Benefit Liability.  The Pension Benefit liability for such transferred Participant will be settled by any affected Employing Companies in December 2019, or as soon as administratively feasible thereafter, using the method described in this paragraph (b).
(3)    Payment.  Such Pension Benefit liability will be paid by the Participant’s prior Employing Company(ies) to either his current Employing Company or his Employing Company as of the date of his Separation from Service, as applicable.  An Employing Company’s share of a Participant’s Pension Benefit liability will be adjusted with interest from December 31, 2018 to the date such liability is settled with the Participant’s current Employing Company or the Employing Company as of the date of his Separation from Service, as applicable.  For purposes of this paragraph (b)(3), the interest rate shall be the 30-year Treasury yield as published by the Department of Treasury for purposes of compliance with Code Section 417(e) determined for September of the calendar year preceding the year in which the transfer of Pension Benefit liability occurs.
2.
Except as amended herein by this Sixth Amendment, the Plan shall remain in full force and effect.

IN WITNESS WHEREOF, the Administrative Committee, through its authorized representative, has adopted this Sixth Amendment to the Southern Company Supplemental Benefit Plan, as amended and restated as of June 30, 2016, this 4th day of December, 2019.

	
				
	 
	BENEFITS ADMINISTRATION COMMITTEE

	 
	By:
	 
	/s/James M. Garvie

	 
	 
	 
	 

	 
	Name:
	James M. Garvie

	 
	 
	 
	 

	 
	Its:
	 
	Chairperson

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