Document:

Registration Rights Agreement dated as of April 29, 2003.

 EXHIBIT 4.3 
  
 $40,000,000 
  
 North Shore Gas Company 
  
 First Mortgage Bonds, Series N-1 
  
 Due May 1, 2013 
  
 REGISTRATION
RIGHTS AGREEMENT 
  
 April 29,
2003 
  
 Banc of America Securities LLC 
 U.S. Bancorp Piper Jaffray Inc. 
 c/o Banc of America Securities LLC

 Bank of America Corporate Center 
 100 North Tryon Street

 8th Floor 
 Charlotte, North Carolina 28255 
  
 Ladies and Gentlemen: 
  
 North Shore Gas Company, an Illinois corporation (the “Company”), proposes to issue and sell to Banc of
America Securities LLC (“Banc of America”) and U.S. Bancorp Piper Jaffray Inc. (“U.S. Bancorp,” and together with Banc of America, the “Initial Purchasers” and each individually referred to as an
“Initial Purchaser”), upon the terms set forth in a purchase agreement dated April 23, 2003 (the “Purchase Agreement”), $40,000,000 aggregate principal amount of its First Mortgage Bonds, Series N-1 due May 1, 2013
(the “Initial Securities”). The Initial Securities will be issued under the Mortgage, dated April 1, 1955, from the Company to Continental Illinois National Bank and Trust Company of Chicago (succeeded through consolidation, merger
or sale by U.S. Bank, National Association), as Trustee (the “Trustee”), which Mortgage has heretofore been amended and supplemented by various supplemental indentures thereto, including the Supplemental Indenture dated as of April
15, 2003 providing for the issuance of the Initial Securities (the “Supplemental Indenture”). As used herein, “Mortgage” shall mean such Mortgage as heretofore amended and supplemented, including the Supplemental
Indenture. As an inducement to the Initial Purchasers to enter into the Purchase Agreement, the Company agrees with the Initial Purchasers, for the benefit of the Initial Purchasers and the holders of the Securities (as defined below) (collectively
the “Holders”), as follows: 

 1.    Registered Exchange Offer.    Unless not permitted
by applicable law (after the Company has complied with the ultimate paragraph of this Section 1) or the policy of the Securities and Exchange Commission (the “Commission”), the Company shall prepare and, not later than 60 days (such
60th day being a “Filing Deadline”) after the date on which the Initial Purchasers purchase the Initial Securities pursuant to the Purchase Agreement (the “Closing Date”), file with the Commission a registration
statement (the “Exchange Offer Registration Statement”) on an appropriate form under the Securities Act of 1933, as amended (the “Securities Act”), with respect to a proposed offer (the “Registered Exchange
Offer”) to the Holders of Transfer Restricted Securities (as defined in Section 6 hereof), who are not prohibited by any law or policy of the Commission from participating in the Registered Exchange Offer, to issue and deliver to such
Holders, in exchange for the Initial Securities, a like aggregate principal amount of debt securities of the Company issued under the Mortgage, identical in all material respects to the Initial Securities and registered under the Securities Act (the
“Exchange Securities”). The Company shall use its reasonable best efforts to (i) cause such Exchange Offer Registration Statement to become effective under the Securities Act within 200 days after the Closing Date (such 200th day
being an “Effectiveness Deadline”) and (ii) keep the Exchange Offer Registration Statement effective for not less than 30 days (or longer, if required by applicable law) after the date notice of the Registered Exchange Offer is
mailed to the Holders (such period being called the “Exchange Offer Registration Period”). 
  
 If the Company commences the Registered Exchange Offer, the Company (i) will be entitled to consummate the Registered Exchange Offer 30 days after such
commencement (provided that the Company has accepted all the Initial Securities theretofore validly tendered in accordance with the terms of the Registered Exchange Offer) and (ii) will be required to consummate the Registered Exchange Offer
no later than 40 days after the date on which the Exchange Offer Registration Statement is declared effective (such 40th day being the “Consummation Deadline”). 
  
 Following the declaration of the effectiveness of the Exchange Offer Registration Statement, the Company shall promptly
commence the Registered Exchange Offer, it being the objective of such Registered Exchange Offer to enable each Holder of Transfer Restricted Securities electing to exchange the Initial Securities for Exchange Securities (assuming that such Holder
is not an affiliate of the Company within the meaning of the Securities Act, acquires the Exchange Securities in the ordinary course of such Holder’s business and has no arrangements with any person to participate in the distribution of the
Exchange Securities and is not prohibited by any law or policy of the Commission from participating in the Registered Exchange Offer) to trade such Exchange Securities from and after their receipt without any limitations or restrictions under the
Securities Act and without material restrictions under the securities laws of the several states of the United States. 
  
 The Company acknowledges that, pursuant to current interpretations by the Commission’s staff of Section 5 of the Securities Act, in the absence of an
applicable exemption therefrom, (i) each Holder which is a broker-dealer electing to exchange Initial Securities, acquired for its own account as a result of market making activities or other trading activities, for Exchange Securities (an
“Exchanging Dealer”), is required to deliver a prospectus containing the information set forth in (a) Annex A hereto on the cover, (b) Annex B hereto in the 
  

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 “Exchange Offer Procedures” section and the “Purpose of the Exchange Offer” section,
and (c) Annex C hereto in the “Plan of Distribution” section of such prospectus in connection with a sale of any such Exchange Securities received by such Exchanging Dealer pursuant to the Registered Exchange Offer and (ii) the Initial
Purchasers that elect to sell Securities (as defined below) acquired in exchange for Initial Securities constituting any portion of an unsold allotment, are required to deliver a prospectus containing the information required by Items 507 or 508 of
Regulation S-K under the Securities Act, as applicable, in connection with such sale. 
  
 The Company shall use its reasonable best efforts to keep the Exchange Offer Registration Statement effective and to amend and supplement the prospectus contained therein, in order to permit such prospectus to be
lawfully delivered by all persons subject to the prospectus delivery requirements of the Securities Act for such period of time as such persons must comply with such requirements in order to resell the Exchange Securities; provided, however,
that (i) in the case where such prospectus and any amendment or supplement thereto must be delivered by an Exchanging Dealer or either of the Initial Purchasers, such period shall be the lesser of 180 days and the date on which all Exchanging
Dealers and the Initial Purchasers have sold all Exchange Securities held by them (unless such period is extended pursuant to Section 3(j) below) and (ii) the Company shall make such prospectus and any amendment or supplement thereto available to
any broker-dealer for use in connection with any resale of any Exchange Securities for a period of not less than 180 days after the consummation of the Registered Exchange Offer. 
  
 If, upon consummation of the Registered Exchange Offer, either of the Initial Purchasers holds Initial Securities acquired
by it as part of its initial distribution, the Company, simultaneously with the delivery of the Exchange Securities pursuant to the Registered Exchange Offer, shall issue and deliver to such Initial Purchaser upon the written request of such Initial
Purchaser, in exchange (the “Private Exchange”) for the Initial Securities held by such Initial Purchaser, a like principal amount of debt securities of the Company issued under the Mortgage and identical in all material respects to
the Initial Securities (the “Private Exchange Securities”). The Initial Securities, the Exchange Securities and the Private Exchange Securities are herein collectively called the “Securities.” 
  
 In connection with the Registered Exchange Offer, the Company shall:

  
 (a)    mail to each
Holder a copy of the prospectus forming part of the Exchange Offer Registration Statement, together with an appropriate letter of transmittal and related documents; 
  
 (b)    keep the Registered Exchange Offer open for not less than 30 days (or longer, if
required by applicable law) after the date notice thereof is mailed to the Holders; 
  
 (c)    utilize the services of a depositary for the Registered Exchange Offer with an address in the Borough of
Manhattan, The City of New York, which may be the Trustee or an affiliate of the Trustee; 
  

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 (d)    permit Holders to withdraw tendered Securities at any time
prior to the close of business, New York time, on the last business day on which the Registered Exchange Offer shall remain open; and 
  
 (e)    otherwise comply with all applicable laws. 
  
 As soon as practicable after the close of the Registered Exchange Offer or the Private Exchange, as the case may be, the
Company shall: 
  
 (x)    accept for exchange all the Securities validly tendered and not withdrawn pursuant to the Registered Exchange Offer and the Private Exchange; 
  
 (y)    deliver to the Trustee for cancellation all the Initial Securities so accepted
for exchange; and 
  
 (z)    cause the Trustee to authenticate and deliver promptly to each Holder of the Initial Securities, Exchange Securities or Private Exchange Securities, as the case may be, equal in principal amount to the Initial
Securities of such Holder so accepted for exchange. 
  
 The
Mortgage will provide that the Exchange Securities will not be subject to the transfer restrictions set forth in the Mortgage and that all the Securities will vote and consent together on all matters as one class and that none of the Securities will
have the right to vote or consent as a class separate from one another on any matter. 
  
 Interest on each Exchange Security and Private Exchange Security issued pursuant to the Registered Exchange Offer and in the Private Exchange will accrue from the last interest payment date on which interest was paid
on the Initial Securities surrendered in exchange therefor or, if no interest has been paid on the Initial Securities, from the date of original issue of the Initial Securities. 
  
 Each Holder participating in the Registered Exchange Offer shall be required to represent to the Company that at the time of
the consummation of the Registered Exchange Offer (i) any Exchange Securities received by such Holder will be acquired in the ordinary course of business, (ii) such Holder will have no arrangements or understanding with any person to participate in
the distribution of the Securities or the Exchange Securities within the meaning of the Securities Act, (iii) such Holder is not an “affiliate,” as defined in Rule 405 of the Securities Act, of the Company or if it is an affiliate, such
Holder will comply with the registration and prospectus delivery requirements of the Securities Act to the extent applicable, (iv) if such Holder is not a broker-dealer, that it is not engaged in, and does not intend to engage in, the distribution
of the Exchange Securities and (v) if such Holder is a broker-dealer, that it will receive Exchange Securities for its own account in exchange for Initial Securities that were acquired as a result of market-making activities or other trading
activities and that it will be required to acknowledge that it will deliver a prospectus in connection with any resale of such Exchange Securities. 
  

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 Notwithstanding any other provisions hereof, the Company will ensure that (i) any Exchange Offer
Registration Statement and any amendment thereto and any prospectus forming part thereof and any supplement thereto complies in all material respects with the Securities Act and the rules and regulations thereunder, (ii) any Exchange Offer
Registration Statement and any amendment thereto does not, when it becomes effective, contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not
misleading and (iii) any prospectus forming part of any Exchange Offer Registration Statement, and any supplement to such prospectus, does not include an untrue statement of a material fact or omit to state a material fact required to be stated
therein or necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading. 
  
 If following the date hereof there has been announced a change in Commission policy with respect to exchange offers that in the reasonable opinion of
counsel to the Company raises a substantial question as to whether the Registered Exchange Offer is permitted by applicable federal law, the Company will seek a no-action letter or other favorable decision from the Commission allowing the Company to
consummate the Registered Exchange Offer. The Company will pursue the issuance of such a decision to the Commission staff level. In connection with the foregoing, the Company will take all such other actions as may be requested by the Commission or
otherwise required in connection with the issuance of such decision, including without limitation (i) participating in telephonic conferences with the Commission, (ii) delivering to the Commission staff an analysis prepared by counsel to the Company
setting forth the legal bases, if any, upon which such counsel has concluded that the Registered Exchange Offer should be permitted and (iii) diligently pursuing a resolution (which need not be favorable) by the Commission staff. 
  
 2.    Shelf
Registration.    If, (i) because of any change in law or in applicable interpretations thereof by the staff of the Commission, the Company is not permitted to effect a Registered Exchange Offer, as contemplated by Section 1
hereof, (ii) the Registered Exchange Offer is not consummated by the 240th day after the Closing Date, (iii) either of the Initial Purchasers so requests with respect to the Initial Securities (or the Private Exchange Securities) not eligible to be
exchanged for Exchange Securities in the Registered Exchange Offer and held by it following consummation of the Registered Exchange Offer or (iv) any Holder (other than an Exchanging Dealer) is not eligible to participate in the Registered Exchange
Offer or, in the case of any Holder (other than an Exchanging Dealer) that participates in the Registered Exchange Offer, such Holder does not receive freely tradeable Exchange Securities on the date of the exchange and any such Holder so requests,
the Company shall take the following actions (the date on which any of the conditions described in the foregoing clauses (i) through (iv) occur, including in the case of clauses (iii) or (iv) the receipt of the required notice, being a
“Trigger Date”): 
  
 (a)    The Company shall promptly (but in no event more than 60 days after the Trigger Date (such 60th day being a “Filing Deadline”)) file with the Commission and thereafter use its reasonable best
efforts to cause to be declared effective no later than 180 days after the Trigger Date (such 180th day being an “Effectiveness Deadline”) a registration statement (the “Shelf Registration Statement” and, together
with the 
  

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Exchange Offer Registration Statement, a “Registration Statement”) on an appropriate form under the Securities Act relating to the offer and
sale of the Transfer Restricted Securities by the Holders thereof from time to time in accordance with the methods of distribution set forth in the Shelf Registration Statement and Rule 415 under the Securities Act (hereinafter, the “Shelf
Registration”); provided, however, that no Holder (other than the Initial Purchaser) shall be entitled to have the Securities held by it covered by such Shelf Registration Statement unless such Holder agrees in writing to be bound by
all the provisions of this Agreement applicable to such Holder. 
  
 (b)    The Company shall use its reasonable best efforts to keep the Shelf Registration Statement continuously effective in order to permit the prospectus included therein to be lawfully delivered
by the Holders of the relevant Securities, for a period (the “Shelf Registration Period”) of two years (or for such longer period if extended pursuant to Section 3(j) below) from the date of its effectiveness or such shorter period
that will terminate when all the Securities covered by the Shelf Registration Statement (i) have been sold pursuant thereto or (ii) are no longer restricted securities (as defined in Rule 144 under the Securities Act, or any successor rule thereof).
The Company shall be deemed not to have used its reasonable best efforts to keep the Shelf Registration Statement effective during the requisite period if it voluntarily takes any action that would result in Holders of Securities covered thereby not
being able to offer and sell such Securities during that period, unless such action is required by applicable law, rules, regulations or administrative or judicial order. 
  
 (c)    Notwithstanding any other provisions of this Agreement to the contrary, the
Company shall cause the Shelf Registration Statement and the related prospectus and any amendment or supplement thereto, as of the effective date of the Shelf Registration Statement, amendment or supplement, (i) to comply in all material respects
with the applicable requirements of the Securities Act and the rules and regulations of the Commission and (ii) not to contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary in
order to make the statements therein (in the case of the prospectus, in light of the circumstances under which they were made) not misleading. 
  
 3.    Registration Procedures.    In connection with any Shelf Registration contemplated by Section 2
hereof and, to the extent applicable, any Registered Exchange Offer contemplated by Section 1 hereof, the following provisions shall apply: 
  
 (a)    The Company shall (i) furnish to the Initial Purchasers, prior to the filing thereof with the Commission, a
copy of the Registration Statement and each amendment thereof and each supplement, if any, to the prospectus included therein and, in the event that either of the Initial Purchasers (with respect to any portion of an unsold allotment from the
original offering) is participating in the Registered Exchange Offer or the Shelf Registration Statement, the Company shall use its reasonable best efforts to reflect in each such document, when so filed with the Commission, such comments as such
Initial Purchaser reasonably may propose; (ii) include the information set forth in Annex A hereto on the cover, in Annex B hereto in the “Exchange Offer Procedures” section and 
  

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the “Purpose of the Exchange Offer” section and in Annex C hereto in the “Plan of Distribution” section of the prospectus forming a part
of the Exchange Offer Registration Statement and include the information set forth in Annex D hereto in the Letter of Transmittal delivered pursuant to the Registered Exchange Offer; (iii) if requested by either of the Initial Purchasers, include
the information required by Items 507 or 508 of Regulation S-K under the Securities Act, as applicable, in the prospectus forming a part of the Exchange Offer Registration Statement; (iv) include within the prospectus contained in the Exchange Offer
Registration Statement a section entitled “Plan of Distribution,” reasonably acceptable to the Initial Purchasers, which shall contain a summary statement of the positions taken or policies made by the staff of the Commission with respect
to the potential “underwriter” status of any broker-dealer that is the beneficial owner (as defined in Rule 13d-3 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) of Exchange Securities received
by such broker-dealer in the Registered Exchange Offer (a “Participating Broker-Dealer”), whether such positions or policies have been publicly disseminated by the staff of the Commission or such positions or policies, in the
reasonable judgment of the Initial Purchasers based upon advice of counsel (which may be in-house counsel), represent the prevailing views of the staff of the Commission; and (v) in the case of a Shelf Registration Statement, include the names of
the Holders who propose to sell Securities pursuant to the Shelf Registration Statement as selling securityholders. 
  
 (b)    The Company shall give written notice to the Initial Purchasers, the Holders of the Securities and any
Participating Broker-Dealer from whom the Company has received prior written notice that it will be a Participating Broker-Dealer in the Registered Exchange Offer (which notice pursuant to clauses (ii)-(v) hereof shall be accompanied by an
instruction to suspend the use of the prospectus until the requisite changes have been made): 
  
 (i)    when the Registration Statement or any amendment thereto has been filed with the Commission and when the
Registration Statement or any post-effective amendment thereto has become effective; 
  
 (ii)    of any request by the Commission for amendments or supplements to the Registration Statement or the prospectus
included therein or for additional information; 
  
 (iii)    of the issuance by the Commission of any stop order suspending the effectiveness of the Registration Statement or the initiation of any proceedings for that purpose; 
  
 (iv)    of the receipt by the Company or
its legal counsel of any notification with respect to the suspension of the qualification of the Securities for sale in any jurisdiction or the initiation or threatening of any proceeding for such purpose; and 
  

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 (v) of the happening of any event that requires the Company to make changes in the
Registration Statement or the prospectus in order that the Registration Statement or the prospectus do not contain an untrue statement of a material fact nor omit to state a material fact required to be stated therein or necessary to make the
statements therein (in the case of the prospectus, in light of the circumstances under which they were made) not misleading. 
  
 (c) The Company shall use its reasonable best efforts to obtain the withdrawal at the earliest possible time, of any order suspending the
effectiveness of the Registration Statement. 
  
 (d) The Company shall furnish to each Holder of Securities included within the coverage of the Shelf Registration, without charge, at least one copy of the Shelf Registration Statement and any post-effective amendment thereto, including
financial statements and schedules, and, if the Holder so requests in writing, all exhibits thereto (including those, if any, incorporated by reference). 
  
 (e) The Company shall deliver to each Exchanging Dealer and the Initial Purchasers, and to any other Holder who so requests, without
charge, at least one copy of the Exchange Offer Registration Statement and any post-effective amendment thereto, including financial statements and schedules, and, if either of the Initial Purchasers or any such Holder requests, all exhibits thereto
(including those incorporated by reference). 
  
 (f) The Company shall, during the Shelf Registration Period, deliver to each Holder of Securities included within the coverage of the Shelf Registration, without charge, as many copies of the prospectus (including each preliminary
prospectus) included in the Shelf Registration Statement and any amendment or supplement thereto as such person may reasonably request. The Company consents, subject to the provisions of this Agreement, to the use of the prospectus or any amendment
or supplement thereto by each of the selling Holders of the Securities in connection with the offering and sale of the Securities covered by the prospectus, or any amendment or supplement thereto, included in the Shelf Registration Statement.

  
 (g) The Company shall deliver to the Initial
Purchasers, any Exchanging Dealer, any Participating Broker-Dealer and such other persons required to deliver a prospectus following the Registered Exchange Offer, without charge, as many copies of the final prospectus included in the Exchange Offer
Registration Statement and any amendment or supplement thereto as such persons may reasonably request. The Company consents, subject to the provisions of this Agreement, to the use of the prospectus or any amendment or supplement thereto by the
Initial Purchasers, if necessary, any Participating Broker-Dealer and such other persons required to deliver a prospectus following the Registered Exchange Offer in connection with the offering and sale of the Exchange Securities covered by the
prospectus, or any amendment or supplement thereto, included in such Exchange Offer Registration Statement. 
  

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 (h) Prior to any public offering of the Securities pursuant to any Registration Statement
the Company shall register or qualify or cooperate with the Holders of the Securities included therein and their respective counsel in connection with the registration or qualification of the Securities for offer and sale under the securities or
“blue sky” laws of such states of the United States as any Holder of the Securities reasonably requests in writing and do any and all other acts or things necessary or advisable to enable the offer and sale in such jurisdictions of the
Securities covered by such Registration Statement; provided, however, that the Company shall not be required to (i) qualify generally to do business in any jurisdiction where it is not then so qualified or (ii) take any action which would
subject it to general service of process or to taxation in any jurisdiction where it is not then so subject. 
  
 (i) The Company shall cooperate with the Holders of the Securities to facilitate the timely preparation and delivery of certificates
representing the Securities to be sold pursuant to any Registration Statement free of any restrictive legends and in such denominations and registered in such names as the Holders may request a reasonable period of time prior to sales of the
Securities pursuant to such Registration Statement. 
  
 (j) Upon the occurrence of any event contemplated by paragraphs (ii) through (v) of Section 3(b) above during the period for which the Company is required to maintain an effective Registration Statement, the Company shall promptly prepare
and file a post-effective amendment to the Registration Statement or a supplement to the related prospectus and any other required document so that, as thereafter delivered to Holders of the Securities or purchasers of Securities, the prospectus
will not contain an untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary to make the statements therein, in light of the circumstances under which they were made, not misleading. If the
Company notifies the Initial Purchasers, the Holders of the Securities and any known Participating Broker-Dealer in accordance with paragraphs (ii) through (v) of Section 3(b) above to suspend the use of the prospectus until the requisite changes to
the prospectus have been made, then the Initial Purchasers, the Holders of the Securities and any such Participating Broker-Dealers shall suspend use of such prospectus, and the period of effectiveness of the Shelf Registration Statement provided
for in Section 2(b) above and the Exchange Offer Registration Statement provided for in Section 1 above shall each be extended by the number of days from and including the date of the giving of such notice to and including the date when the Initial
Purchasers, the Holders of the Securities and any known Participating Broker-Dealer shall have received such amended or supplemented prospectus pursuant to this Section 3(j). 
  
 (k) Not later than the effective date of the applicable Registration Statement, the Company will provide a
CUSIP number for the Initial Securities, the Exchange Securities or the Private Exchange Securities, as the case may be, and provide the applicable trustee with printed certificates for the Initial Securities, the Exchange Securities or the Private
Exchange Securities, as the case may be, in a form eligible for deposit with The Depository Trust Company. 
  

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 (l) The Company will comply with all rules and regulations of the Commission to the
extent and so long as they are applicable to the Registered Exchange Offer or the Shelf Registration and will make generally available to its security holders (or otherwise provide in accordance with Section 11(a) of the Securities Act) an earnings
statement satisfying the provisions of Section 11(a) of the Securities Act, no later than 45 days after the end of a 12-month period (or 90 days, if such period is a fiscal year) beginning with the first month of the Company’s first fiscal
quarter commencing after the effective date of the Registration Statement, which statement shall cover such 12-month period. 
  
 (m) The Company shall cause the Mortgage to be qualified under the Trust Indenture Act of 1939, as amended, in a timely manner and
containing such changes, if any, as shall be necessary for such qualification. In the event that such qualification would require the appointment of a new trustee under the Mortgage, the Company shall appoint a new trustee thereunder pursuant to the
applicable provisions of the Mortgage. 
  
 (n)
The Company may require each Holder of Securities to be sold pursuant to the Shelf Registration Statement to furnish to the Company such information regarding the Holder and the distribution of the Securities as the Company may from time to time
reasonably require for inclusion in the Shelf Registration Statement, and the Company may exclude from such registration the Securities of any Holder that unreasonably fails to furnish such information within a reasonable time after receiving such
request. 
  
 (o) The Company shall enter into
such customary agreements (including, if requested, an underwriting agreement in customary form) and take all such other action, if any, as any Holder of the Securities shall reasonably request in order to facilitate the disposition of the
Securities pursuant to any Shelf Registration. 
  
 (p) In the case of any Shelf Registration, the Company shall (i) make reasonably available for inspection by the Holders of the Securities, any underwriter participating in any disposition pursuant to the Shelf Registration Statement and
any attorney, accountant or other agent retained by the Holders of the Securities or any such underwriter all relevant financial and other records, pertinent corporate documents and properties of the Company and (ii) cause the Company’s
officers, directors, employees, accountants and auditors to supply all relevant information reasonably requested by the Holders of the Securities or any such underwriter, attorney, accountant or agent in connection with the Shelf Registration
Statement, in each case, as shall be reasonably necessary to enable such persons, to conduct a reasonable investigation within the meaning of Section 11 of the Securities Act; provided, however, that the foregoing inspection and information
gathering shall be coordinated by Banc of America, as an Initial Purchaser and on behalf of the other parties, by one counsel designated by and on behalf of such other parties as described in Section 4 hereof. 
  
 (q) In the case of any Shelf Registration, the Company, if
requested by any Holder of Securities covered thereby, shall cause (i) its counsel to deliver an opinion and updates thereof relating to the Securities in customary form addressed to such Holders 
  

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 and the managing underwriters, if any, thereof and dated, in the case of the initial opinion, the
effective date of such Shelf Registration Statement (it being agreed that the matters to be covered by such opinion shall include, without limitation, the due incorporation and good standing of the Company and its subsidiaries; the qualification of
the Company and its subsidiaries to transact business as foreign corporations; the due authorization, execution and delivery of the relevant agreement of the type referred to in Section 3(o) hereof; the due authorization, execution, authentication
and issuance, and the validity and enforceability, of the applicable Securities; the absence of material legal or governmental proceedings involving the Company and its subsidiaries, other than as set forth in the Shelf Registration Statement or the
documents incorporated by reference therein; the absence of governmental approvals required to be obtained in connection with the Shelf Registration Statement, the offering and sale of the applicable Securities, or any agreement of the type referred
to in Section 3(o) hereof; the compliance as to form of such Shelf Registration Statement and any documents incorporated by reference therein and of the Mortgage with the requirements of the Securities Act and the Trust Indenture Act, respectively;
and, as of the date of the opinion and as of the effective date of the Shelf Registration Statement or most recent post-effective amendment thereto, as the case may be, the absence from such Shelf Registration Statement and the prospectus included
therein, as then amended or supplemented, and from any documents incorporated by reference therein of an untrue statement of a material fact or the omission to state therein a material fact required to be stated therein or necessary to make the
statements therein not misleading (in the case of any documents incorporated by reference, in the light of the circumstances existing at the time that such documents were filed with the Commission under the Exchange Act)); (ii) its officers to
execute and deliver all customary documents and certificates and updates thereof requested by any underwriters of the applicable Securities; and (iii) its independent public accountants to provide to the selling Holders of the applicable Securities
and any underwriter therefor a comfort letter in customary form and covering matters of the type customarily covered in comfort letters in connection with primary underwritten offerings, subject to receipt of appropriate documentation as
contemplated, and only if permitted, by Statement of Auditing Standards No. 72. 
  
 (r) In the case of the Registered Exchange Offer, if requested by either of the Initial Purchasers or any known Participating
Broker-Dealer, the Company shall cause (i) its counsel to deliver to the Initial Purchasers or such Participating Broker-Dealer a signed opinion in the form set forth in Section 6(b) of the Purchase Agreement with such changes as are customary in
connection with the preparation of a Registration Statement and (ii) its independent public accountants to deliver to the Initial Purchasers or such Participating Broker-Dealer a comfort letter, in customary form, meeting the requirements as to the
substance thereof as set forth in Section 6(e) of the Purchase Agreement, with appropriate date changes. 
  
 (s) If a Registered Exchange Offer or a Private Exchange is to be consummated, upon delivery of the Initial Securities by Holders to the
Company (or to such other Person as directed by the Company) in exchange for the Exchange Securities or the Private Exchange Securities, as the case may be, the Company shall mark, or caused to be marked, on the Initial Securities so exchanged that
such Initial Securities are 
  

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 being canceled in exchange for the Exchange Securities or the Private Exchange Securities, as the case
may be; in no event shall the Initial Securities be marked as paid or otherwise satisfied. 
  
 (t) The Company will use its reasonable best efforts to (a) if the Initial Securities have been rated prior to the initial sale of such
Initial Securities, confirm such ratings will apply to the Securities covered by a Registration Statement, or (b) if the Initial Securities were not previously rated, cause the Securities covered by a Registration Statement to be rated with the
appropriate rating agencies, if so requested by Holders of a majority in aggregate principal amount of Securities covered by such Registration Statement, or by the managing underwriters, if any. 
  
 (u) In the event that any broker-dealer registered under the
Exchange Act shall underwrite any Securities or participate as a member of an underwriting syndicate or selling group or “assist in the distribution” (within the meaning of the Conduct Rules (the “Rules”) of the National
Association of Securities Dealers, Inc. (“NASD”)) thereof, whether as a Holder of such Securities or as an underwriter, a placement or sales agent or a broker or dealer in respect thereof, or otherwise, the Company will assist such
broker-dealer in complying with the requirements of such Rules, including, without limitation, by (i) if such Rules, including Rule 2720, shall so require, engaging a “qualified independent underwriter” (as defined in Rule 2720) to
participate in the preparation of the Registration Statement relating to such Securities, to exercise usual standards of due diligence in respect thereto and, if any portion of the offering contemplated by such Registration Statement is an
underwritten offering or is made through a placement or sales agent, to recommend the yield of such Securities, (ii) indemnifying any such qualified independent underwriter to the extent of the indemnification of underwriters provided in Section 5
hereof and (iii) providing such information to such broker-dealer as may be required in order for such broker-dealer to comply with the requirements of the Rules. 
  
 (v) The Company shall use its reasonable best efforts to take all other steps necessary to effect the
registration of the Securities covered by a Registration Statement contemplated hereby. 
  
 4. Registration Expenses. (a) All expenses incident to the Company’s performance of and compliance with this Agreement will be borne by the Company, regardless of whether a Registration Statement is ever
filed or becomes effective, including without limitation; 
  
 (i) all registration and filing fees and expenses; 
  
 (ii) all fees and expenses of compliance with federal securities and state “blue sky” or securities laws; 
  
 (iii) all expenses of printing (including printing
certificates for the Securities to be issued in the Registered Exchange Offer and the Private Exchange and printing of Prospectuses), messenger and delivery services and telephone; 
  

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 (iv) all fees and disbursements of counsel for the Company; 
  
 (v) all application and filing fees in connection with
listing the Exchange Securities on a national securities exchange or automated quotation system pursuant to the requirements hereof; and 
  
 (vi) all fees and disbursements of independent certified public accountants of the Company (including the expenses of any special audit
and comfort letters required by or incident to such performance). 
  
 The Company will bear its internal expenses (including, without limitation, all salaries and expenses of its officers and employees performing legal or accounting duties), the expenses of any annual audit and the fees and expenses of any
person, including special experts, retained by the Company. 
  
 (b) In connection with any Registration Statement required by this Agreement, the Company will reimburse the Initial Purchasers and the Holders of Transfer Restricted Securities who are tendering Initial Securities in the Registered
Exchange Offer and/or selling or reselling Securities pursuant to the “Plan of Distribution” contained in the Exchange Offer Registration Statement or the Shelf Registration Statement, as applicable, for the reasonable fees and
disbursements of not more than one counsel, who shall be Chapman and Cutler, unless another firm shall be chosen by the Holders of a majority in principal amount of the Transfer Restricted Securities for whose benefit such Registration Statement is
being prepared. 
  
 5. Indemnification. (a) The Company
agrees to indemnify and hold harmless each Holder of the Securities, any Participating Broker-Dealer and each person, if any, who controls such Holder or such Participating Broker-Dealer within the meaning of the Securities Act or the Exchange Act
(each Holder, any Participating Broker-Dealer and such controlling persons are referred to collectively as the “Indemnified Parties”) from and against any losses, claims, damages or liabilities, joint or several, or any actions in
respect thereof (including, but not limited to, any losses, claims, damages, liabilities or actions relating to purchases and sales of the Securities) to which each Indemnified Party may become subject under the Securities Act, the Exchange Act or
otherwise, insofar as such losses, claims, damages, liabilities or actions arise out of or are based upon any untrue statement or alleged untrue statement of a material fact contained in a Registration Statement or prospectus or in any amendment or
supplement thereto or in any preliminary prospectus relating to a Shelf Registration, or arise out of, or are based upon, the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the
statements therein not misleading, and shall reimburse, as incurred, the Indemnified Parties for any reasonable legal fees or other expenses reasonably incurred by them in connection with investigating or defending any such loss, claim, damage,
liability or action in respect thereof; provided, however, that (i) the Company shall not be liable in any such case to the extent that such loss, claim, damage or liability arises out of or is based upon any untrue statement or alleged
untrue statement or omission or alleged omission made in a Registration Statement or prospectus or in any amendment or supplement thereto or in any preliminary prospectus relating to a Shelf Registration in reliance upon and in conformity with
written information pertaining to such Holder and furnished to the Company by or on behalf of 
  

 13 

 such Holder specifically for inclusion therein and (ii) with respect to any untrue statement or omission or alleged
untrue statement or omission made in any preliminary prospectus relating to a Shelf Registration Statement, the indemnity agreement contained in this subsection (a) shall not inure to the benefit of any Holder or Participating Broker-Dealer from
whom the person asserting any such losses, claims, damages or liabilities purchased the Securities concerned, to the extent that a prospectus relating to such Securities was legally required to be delivered by such Holder or Participating
Broker-Dealer under the Securities Act in connection with such purchase and any such loss, claim, damage or liability of such Holder or Participating Broker-Dealer results from the fact that there was not sent or given to such person, at or prior to
the written confirmation of the sale of such Securities to such person, a copy of the final prospectus (which corrected such untrue statement or omission) if the Company had previously furnished copies thereof to such Holder or Participating
Broker-Dealer; provided further, however, that this indemnity agreement will be in addition to any liability which the Company may otherwise have to such Indemnified Party. The Company shall also indemnify underwriters, their officers and
directors and each person who controls such underwriters within the meaning of the Securities Act or the Exchange Act to the same extent as provided above with respect to the indemnification of the Holders of the Securities if requested by such
Holders. 
  
 (b) Each Holder of the Securities, severally and not
jointly, will indemnify and hold harmless the Company and each person, if any, who controls the Company within the meaning of the Securities Act or the Exchange Act from and against any losses, claims, damages or liabilities or any actions in
respect thereof, to which the Company or any such controlling person may become subject under the Securities Act, the Exchange Act or otherwise, insofar as such losses, claims, damages, liabilities or actions arise out of or are based upon any
untrue statement or alleged untrue statement of a material fact contained in a Registration Statement or prospectus or in any amendment or supplement thereto or in any preliminary prospectus relating to a Shelf Registration, or arise out of or are
based upon the omission or alleged omission to state therein a material fact necessary to make the statements therein not misleading, but in each case only to the extent that the untrue statement or omission or alleged untrue statement or omission
was made in reliance upon and in conformity with written information pertaining to such Holder and furnished to the Company by or on behalf of such Holder specifically for inclusion therein; and, subject to the limitation set forth immediately
preceding this clause, shall reimburse, as incurred, the Company for any legal or other expenses reasonably incurred by the Company or any such controlling person in connection with investigating or defending any loss, claim, damage, liability or
action in respect thereof. This indemnity agreement will be in addition to any liability which such Holder may otherwise have to the Company or any of its controlling persons. 
  
 (c) Promptly after receipt by an indemnified party under this Section 5 of notice of the commencement of any action or
proceeding (including a governmental investigation), such indemnified party will, if a claim in respect thereof is to be made against the indemnifying party under this Section 5, notify the indemnifying party of the commencement thereof; but the
omission so to notify the indemnifying party will not, in any event, relieve the indemnifying party from any obligations to any indemnified party other than the indemnification obligation provided in paragraph (a) or (b) above. In case any such
action is brought against any indemnified party, and it notifies the indemnifying party of the commencement thereof, the indemnifying party will be entitled to participate therein and, to the extent that it may wish, jointly with any other

  

 14 

 indemnifying party similarly notified, to assume the defense thereof, with counsel reasonably satisfactory to such
indemnified party (who shall not, except with the consent of the indemnified party, be counsel to the indemnifying party), and after notice from the indemnifying party to such indemnified party of its election so to assume the defense thereof the
indemnifying party will not be liable to such indemnified party under this Section 5 for any legal or other expenses, other than reasonable costs of investigation, subsequently incurred by such indemnified party in connection with the defense
thereof. No indemnifying party shall, without the prior written consent of the indemnified party, effect any settlement of any pending or threatened action in respect of which any indemnified party is or could have been a party and indemnity could
have been sought hereunder by such indemnified party unless such settlement includes an unconditional release of such indemnified party from all liability on any claims that are the subject matter of such action, and does not include a statement as
to or an admission of fault, culpability or a failure to act by or on behalf of any indemnified party. 
  
 (d) If the indemnification provided for in this Section 5 is unavailable or insufficient to hold harmless an indemnified party under subsections (a) or
(b) above, then each indemnifying party shall contribute to the amount paid or payable by such indemnified party as a result of the losses, claims, damages or liabilities (or actions in respect thereof) referred to in subsection (a) or (b) above in
such proportion as is appropriate to reflect the relative fault of the indemnifying party or parties on the one hand and the indemnified party on the other in connection with the statements or omissions that resulted in such losses, claims, damages
or liabilities (or actions in respect thereof) as well as any other relevant equitable considerations. The relative fault of the parties shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a
material fact or the omission or alleged omission to state a material fact relates to information supplied by the Company on the one hand or such Holder or such other indemnified party, as the case may be, on the other, and the parties’
relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission. The amount paid by an indemnified party as a result of the losses, claims, damages or liabilities referred to in the first sentence
of this subsection (d) shall be deemed to include any legal or other expenses reasonably incurred by such indemnified party in connection with investigating or defending any action or claim which is the subject of this subsection (d).
Notwithstanding any other provision of this Section 5(d), the Holders of the Securities shall not be required to contribute any amount in excess of the amount by which the net proceeds received by such Holders from the sale of the Securities
pursuant to a Registration Statement exceeds the amount of damages which such Holders have otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No person guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. For purposes of this paragraph (d), each person, if any, who
controls such indemnified party within the meaning of the Securities Act or the Exchange Act shall have the same rights to contribution as such indemnified party and each person, if any, who controls the Company within the meaning of the Securities
Act or the Exchange Act shall have the same rights to contribution as the Company. 
  
 (e) The agreements contained in this Section 5 shall survive the sale of the Securities pursuant to a Registration Statement and shall remain in full force and effect, regardless of any 
  

 15 

 termination or cancellation of this Agreement or any investigation made by or on behalf of any indemnified party.

  
 6. Additional Interest under Certain Circumstances. (a)
Additional interest (the “Additional Interest”) with respect to the Securities shall be assessed as follows if any of the following events occur (each such event in clauses (i) through (iv) below being herein called a
“Registration Default”): 
  
 (i)
any Registration Statement required by this Agreement is not filed with the Commission on or prior to the applicable Filing Deadline; 
  
 (ii) any Registration Statement required by this Agreement is not declared effective by the Commission on or prior to the applicable
Effectiveness Deadline; 
  
 (iii) the Registered
Exchange Offer has not been consummated on or prior to the Consummation Deadline; or 
  
 (iv) any Registration Statement required by this Agreement has been declared effective by the Commission but (A) such Registration
Statement thereafter ceases to be effective or (B) such Registration Statement or the related prospectus ceases to be usable in connection with resales of Transfer Restricted Securities during the periods specified herein because either (1) any
event occurs as a result of which the related prospectus forming part of such Registration Statement would include any untrue statement of a material fact or omit to state any material fact necessary to make the statements therein in the light of
the circumstances under which they were made not misleading, or (2) it shall be necessary to amend such Registration Statement or supplement the related prospectus, to comply with the Securities Act or the Exchange Act or the respective rules
thereunder. 
  
 Each of the foregoing will constitute a
Registration Default whatever the reason for any such event and whether it is voluntary or involuntary or is beyond the control of the Company or pursuant to operation of law or as a result of any action or inaction by the Commission. 
  
 Additional Interest shall accrue on the Securities over and above the
interest set forth in the title of the Securities from and including the date on which any such Registration Default shall occur to but excluding the date on which all such Registration Defaults have been cured, at a rate of 0.25% per annum (the
“Additional Interest Rate”) for the first 90-day period immediately following the occurrence of such Registration Default. The Additional Interest Rate shall increase by an additional 0.25% per annum with respect to each subsequent
90-day period until all Registration Defaults have been cured, up to a maximum Additional Interest Rate of 1.0% per annum. 
  
 (b) A Registration Default referred to in Section 6(a)(iv) hereof shall be deemed not to have occurred and be continuing in relation to a Shelf
Registration Statement, which is filed on Form S-1 under the Securities Act or any other form that does not allow incorporation by reference, or the related prospectus if (i) such Registration Default has occurred solely as a result of (x) the
filing of a post-effective amendment to such Shelf Registration Statement to 
  

 16 

 incorporate annual audited financial information with respect to the Company where such post-effective amendment is not
yet effective and needs to be declared effective to permit Holders to use the related prospectus or (y) other material events, with respect to the Company that would need to be described in such Shelf Registration Statement or the related prospectus
and (ii) in the case of clause (y), the Company is proceeding promptly and in good faith to amend or supplement such Shelf Registration Statement and related prospectus to describe such events; provided, however, that in any case if such
Registration Default occurs for a continuous period in excess of 30 days, Additional Interest shall be payable in accordance with the above paragraph from the day such Registration Default occurs until such Registration Default is cured. 

 
 (c) Any amounts of Additional Interest due pursuant to Section 6(a) will
be payable in cash on the regular interest payment dates with respect to the Securities. The amount of Additional Interest will be determined by multiplying the applicable Additional Interest Rate by the principal amount of the Securities and
further multiplied by a fraction, the numerator of which is the number of days such Additional Interest Rate was applicable during such period (determined on the basis of a 360-day year comprised of twelve 30-day months), and the denominator of
which is 360. 
  
 (d) “Transfer Restricted
Securities” means each Security until (i) the date on which such Security has been exchanged by a person other than a broker-dealer for a freely transferable Exchange Security in the Registered Exchange Offer, (ii) following the exchange by
a broker-dealer in the Registered Exchange Offer of the Initial Security for an Exchange Note, the date on which such Exchange Note is sold to a purchaser who receives from such broker-dealer on or prior to the date of such sale a copy of the
prospectus contained in the Exchange Offer Registration Statement, (iii) the date on which such Security has been effectively registered under the Securities Act and disposed of in accordance with the Shelf Registration Statement or (iv) the date on
which such Security is distributed to the public pursuant to Rule 144 under the Securities Act or is saleable pursuant to Rule 144(k) under the Securities Act. 
  

(e) The parties hereto agree that the Additional Interest shall constitute a reasonable estimate of the damages that may be incurred by the Holders
(other than the Initial Purchasers) for a Registration Default and shall constitute liquidated damages; the actual damages that the Holders might sustain as a result of a Registration Default would be difficult to ascertain; and the payment of
Additional Interest would be reasonable and just compensation for a Registration Default. 
  
 7. Rules 144 and 144A. The Company shall use its reasonable best efforts to file the reports required to be filed by it under the Securities Act and the Exchange Act in a timely manner and, if at any time the
Company is not required to file such reports, it will, upon the request of any Holder of Securities, make publicly available other information so long as necessary to permit sales of their securities pursuant to Rules 144 and 144A. The Company
covenants that it will take such further action as any Holder of Securities may reasonably request, all to the extent required from time to time to enable such Holder to sell Securities without registration under the Securities Act within the
limitation of the exemptions provided by Rules 144 and 144A (including the requirements of Rule 144A(d)(4)). The Company will provide a copy of this Agreement to prospective purchasers of Initial Securities identified to the 
  

 17 

 Company by either of the Initial Purchasers upon request. Upon the request of any Holder of Initial Securities, the
Company shall deliver to such Holder a written statement as to whether it has complied with such requirements. Notwithstanding the foregoing, nothing in this Section 7 shall be deemed to require the Company to register any of its securities pursuant
to the Exchange Act. 
  
 8. Underwritten Registrations. If
any of the Transfer Restricted Securities covered by any Shelf Registration are to be sold in an underwritten offering, the investment banker or investment bankers and manager or managers that will administer the offering (“Managing
Underwriters”) will be selected by the Holders of a majority in aggregate principal amount of such Transfer Restricted Securities to be included in such offering. 
  
 No person may participate in any underwritten registration hereunder unless such person (i) agrees to sell such
person’s Transfer Restricted Securities on the basis reasonably provided in any underwriting arrangements approved by the persons entitled hereunder to approve such arrangements and (ii) completes and executes all questionnaires, powers of
attorney, indemnities, underwriting agreements and other documents reasonably required under the terms of such underwriting arrangements. 
  
 9. Miscellaneous. 
  
 (a) No Inconsistent Agreements. The Company will not on or after the date of this Agreement enter into any agreement with respect to its securities
that is inconsistent with the rights granted to the Holders in this Agreement or otherwise conflicts with the provisions hereof. The rights granted to the Holders hereunder do not in any way conflict with and are not inconsistent with the rights
granted to the holders of the Company’s securities under any agreement in effect on the date hereof. 
  
 (b) Amendments and Waivers. The provisions of this Agreement may not be amended, modified or supplemented, and waivers or consents to departures
from the provisions hereof may not be given, except by the Company and the written consent of the Holders of a majority in principal amount of the Securities affected by such amendment, modification, supplement, waiver or consents. 
  
 (c) Notices. All notices and other communications provided for or
permitted hereunder shall be made in writing by hand delivery, first-class mail, facsimile transmission, or air courier which guarantees overnight delivery: 
  
 (1) if to a Holder of the Securities, at the most current address given by such Holder to the Company. 
  
 (2) if to the Initial Purchasers: 
  
 Banc of America Securities LLC 
 Bank of America Corporate Center 
 100 North Tryon Street 
  

 18 

 8th Floor 
 Charlotte, NC 28255 
 Fax No.: (704) 388-9939 
 Attention: Brian Hungerford 
  
 with a copy to: 
  
 Chapman and Cutler 
 111 West Monroe Street 
 Chicago, IL 60603 
 Fax No.: (312)701-2361 
 Attention: Paul Kosin 
  
 (3) if to the Company, at its address as follows: 
  
 North Shore Gas Company 
 130 East Randolph Drive 
 Chicago, IL 60601 
 Attention: Treasurer 
  
 with a copy to:

  
 North Shore Gas Company 
 130 East Randolph Drive 
 Chicago, IL 60601 
 Attention: General Counsel 
  
 All such notices and communications shall be deemed to have been duly given:
at the time delivered by hand, if personally delivered; three business days after being deposited in the mail, postage prepaid, if mailed; when receipt is acknowledged by recipient’s facsimile machine operator, if sent by facsimile
transmission; and on the day delivered, if sent by overnight air courier guaranteeing next day delivery. 
  
 (d)    Third Party Beneficiaries.    The Holders shall be third party beneficiaries to the agreements made
hereunder between the Company, on the one hand, and the Initial Purchasers, on the other hand, and shall have the right to enforce such agreements directly to the extent they may deem such enforcement necessary or advisable to protect their rights
or the rights of Holders hereunder. 
  
 (e)    Successors and Assigns.    This Agreement shall inure to the benefit of and be binding upon the successors, assigns and transferees of each of the parties, including, without limitation
and without the need for an express assignment or assumption, subsequent Holders; provided that nothing herein shall be deemed to permit any assignment, transfer or other disposition of the Initial Securities in violation of the terms of the
Purchase Agreement. If any transferees of any Holder shall acquire Initial Securities, in any manner, whether by operation of law or otherwise, such Initial Securities, shall be held subject to all of the terms of this 
  

 19 

 
Agreement, and by taking and holding such Initial Securities such person shall be conclusively deemed to have agreed to be bound by and to perform all of the
terms and provisions of this Agreement and such person shall be entitled to receive the benefits hereof. The Initial Purchasers shall have no liability or obligation to the Company with respect to any failure by a Holder to comply with, or any
breach by any Holder of, the obligations of such Holder under this Agreement. 
  
 (f)    Counterparts.    This Agreement may be executed in any number of counterparts and by the parties hereto in separate counterparts, each of which when so executed
shall be deemed to be an original and all of which taken together shall constitute one and the same agreement. 
  
 (g)    Headings.    The headings in this Agreement are for convenience of reference only and shall not
limit or otherwise affect the meaning hereof. 
  
 (h)    Governing Law.    THIS AGREEMENT SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK
WITHOUT REGARD TO PRINCIPLES OF CONFLICTS OF LAWS. 
  
 (i)    Severability.    If any one or more of the provisions contained
herein, or the application thereof in any circumstance, is held invalid, illegal or unenforceable, the validity, legality and enforceability of any such provision in every other respect and of the remaining provisions contained herein shall not be
affected or impaired thereby. 
  
 (j)    Securities Held by the Company.    Whenever the consent or approval of Holders of a specified percentage of principal amount of Securities is required hereunder, Securities held by the
Company or its affiliates (other than subsequent Holders of Securities if such subsequent Holders are deemed to be affiliates solely by reason of their holdings of such Securities) shall not be counted in determining whether such consent or approval
was given by the Holders of such required percentage. 
  
 (k)    Submission to Jurisdiction; Waiver of Immunities.    By the execution and delivery of this Agreement, the Company and each Initial Purchaser submits to the nonexclusive jurisdiction of
the United States District Court located in the Borough of Manhattan, New York, in any suit or proceeding brought under federal or state securities laws. To the extent that the Company or any Initial Purchaser may acquire any immunity from
jurisdiction of such court or from any legal process (whether through service of notice, attachment prior to judgment, attachment in aid of execution, execution or otherwise) with respect to itself or its property, it hereby irrevocably waives such
immunity in respect of this Agreement, to the fullest extent permitted by law. 
  

 20 

 If the foregoing is in accordance with your understanding of our agreement, please sign and return to the
Company a counterpart hereof, whereupon this instrument, along with all counterparts, will become a binding agreement among the Initial Purchasers and the Company, in accordance with its terms. 
  

	 Very truly yours,
	 	 
	 	 	 	 	 	 	 
	 NORTH SHORE GAS COMPANY
	 	 
	 	 	 	 	 	 	 
	 By
	 	     /s/    Thomas A. Nardi

	 	 
	 	 	 Name:    
	 	 Thomas A. Nardi

	 	 	 Title
	 	 Senior Vice President, Chief
     Financial Officer and Treasurer

  

 21 

 The foregoing Registration Rights 
 Agreement is hereby confirmed and 
 accepted as of the date first above written. 
  
 BANC OF AMERICA SECURITIES LLC 
  
 By    /s/    Peter J. Carbone 

	 	

 Name:      Peter J. Carbone 

	 	

 Title:        Vice President 

	 	

  
 U.S.
BANCORP PIPER JAFFRAY INC. 
  
 By    /s/    Mark Stevenson                            

	 	

 Name:      Mark Stevenson 

	 	

 Title:        Managing Director

	 	

  

 22 

 ANNEX A 
  
 Each broker-dealer that receives Exchange Securities for its own account pursuant to the Exchange Offer must acknowledge
that it will deliver a prospectus in connection with any resale of such Exchange Securities. The Letter of Transmittal states that by so acknowledging and by delivering a prospectus, a broker-dealer will not be deemed to admit that it is an
“underwriter” within the meaning of the Securities Act. This Prospectus, as it may be amended or supplemented from time to time, may be used by a broker-dealer in connection with resales of Exchange Securities received in exchange for
Initial Securities where such Initial Securities were acquired by such broker-dealer as a result of market-making activities or other trading activities. The Company has agreed that, for a period of 180 days after the Expiration Date (as defined
herein), it will make this Prospectus available to any broker-dealer for use in connection with any such resale. See “Plan of Distribution.” 
  

 23 

 ANNEX B 
  
 Each broker-dealer that receives Exchange Securities for its own account in exchange for Initial Securities, where such
Initial Securities were acquired by such broker-dealer as a result of market-making activities or other trading activities, must acknowledge that it will deliver a prospectus in connection with any resale of such Exchange Securities. See “Plan
of Distribution.” 
  

 24 

 ANNEX C 
  
 PLAN OF DISTRIBUTION 
  
 Each broker-dealer that receives Exchange Securities for its own account
pursuant to the Exchange Offer must acknowledge that it will deliver a prospectus in connection with any resale of such Exchange Securities. This Prospectus, as it may be amended or supplemented from time to time, may be used by a broker-dealer in
connection with resales of Exchange Securities received in exchange for Initial Securities where such Initial Securities were acquired as a result of market-making activities or other trading activities. The Company has agreed that, for a period of
180 days after the Expiration Date, it will make this prospectus, as amended or supplemented, available to any broker-dealer for use in connection with any such resale. In addition, until
                    , 200  , all dealers effecting transactions in the Exchange Securities may be required to deliver a
prospectus.1 
  
 The Company will not receive any proceeds from any sale of Exchange Securities by broker-dealers. Exchange Securities received by broker-dealers for their
own account pursuant to the Exchange Offer may be sold from time to time in one or more transactions in the over-the-counter market, in negotiated transactions, through the writing of options on the Exchange Securities or a combination of such
methods of resale, at market prices prevailing at the time of resale, at prices related to such prevailing market prices or negotiated prices. Any such resale may be made directly to purchasers or to or through brokers or dealers who may receive
compensation in the form of commissions or concessions from any such broker-dealer or the purchasers of any such Exchange Securities. Any broker-dealer that resells Exchange Securities that were received by it for its own account pursuant to the
Exchange Offer and any broker or dealer that participates in a distribution of such Exchange Securities may be deemed to be an “underwriter” within the meaning of the Securities Act and any profit on any such resale of Exchange Securities
and any commission or concessions received by any such persons may be deemed to be underwriting compensation under the Securities Act. The Letter of Transmittal states that, by acknowledging that it will deliver and by delivering a prospectus, a
broker-dealer will not be deemed to admit that it is an “underwriter” within the meaning of the Securities Act. 
  
 For a period of 180 days after the Expiration Date the Company will promptly send additional copies of this Prospectus and any amendment or supplement to
this Prospectus to any broker-dealer that requests such documents in the Letter of Transmittal. The Company has agreed to pay all expenses incident to the Exchange Offer (including the expenses of one counsel for the Holders of the Securities) other
than commissions or concessions of any brokers or dealers and will indemnify the Holders of the Securities (including any broker-dealers) against certain liabilities, including liabilities under the Securities Act. 

	1	 	In addition, the legend required by Item 502(b) of Regulation S-K will appear on the back cover page of the Exchange Offer prospectus. 

  

 25 

 ANNEX D 
  

	[  ]	 	CHECK HERE IF YOU ARE A BROKER-DEALER AND
WISH TO RECEIVE 10 ADDITIONAL COPIES OF THE PROSPECTUS AND 10 COPIES OF
ANY AMENDMENTS OR SUPPLEMENTS THERETO. 

  
 Name:                                     
                                    
  
 Address:
                                        
                             
  
 If the undersigned is not a broker-dealer, the undersigned represents that it is not engaged in, and does not intend to
engage in, a distribution of Exchange Securities. If the undersigned is a broker-dealer that will receive Exchange Securities for its own account in exchange for Initial Securities that were acquired as a result of market-making activities or other
trading activities, it acknowledges that it will deliver a prospectus in connection with any resale of such Exchange Securities; however, by so acknowledging and by delivering a prospectus, the undersigned will not be deemed to admit that it is an
“underwriter” within the meaning of the Securities Act. 
  

 26TERMINATION  AND RELEASE AGREEMENT BY AND BETWEEN IMMULOGIC PHARMACEUTICAL CORPO

 Exhibit 4.18 
  
 TERMINATION AND RELEASE AGREEMENT 
  
 TERMINATION AND RELEASE AGREEMENT, dated as of January 8, 2003 (the “Termination and Release Agreement”),
by and between (i) ImmuLogic Pharmaceutical Corporation Liquidating Trust, a trust created under the laws of Delaware (the “Trust”) and Immulogic Pharmaceutical Corporation, a Delaware corporation (the “Corporation”
and together with the Trust “ImmuLogic”), and (ii) Cantab Pharmaceuticals Ltd., formerly known as Cantab Pharmaceuticals plc (“Cantab”), and Xenova Group plc, a corporation organized under the laws of England and
Wales, as the parent of Cantab (“Xenova”). 
  
 R E C I T A L S 
  
 WHEREAS, ImmuLogic and Cantab are parties to a purchase agreement dated December 18, 1998 (the “Purchase Agreement” and together with the other documents executed in connection therewith the
“Purchase Documents”) pursuant to which Cantab has acquired from ImmuLogic the Assets (as defined in the Purchase Agreement); and 
  
 WHEREAS, ImmuLogic, Cantab and Xenova desire to settle all their rights, liabilities and claims arising out of the Purchase Documents on the terms and
conditions set forth herein; 
  
 NOW THEREFORE, in consideration
of the mutual promises and covenants contained herein, and other good and valuable consideration, the receipt, sufficiency and adequacy of which are hereby acknowledged, the parties hereto hereby agree as follows: 
  
 1. Mutual Release. Effective upon ImmuLogic’s receipt of US$ 1
million form Xenova, in cash by wire transfer of immediately available funds: 
  
 (a) ImmuLogic, Cantab and Xenova hereby agree that all obligations of Xenova, Cantab and ImmuLogic as specified in and arising from the Purchase Documents (including, without limitation, Article 2 thereof) and that
certain letter agreement, dated August 21, 2002, between Xenova and ImmuLogic (the “Letter Agreement”) are hereby terminated and neither party shall have any liability thereunder or with respect thereto. 
  
 (b) ImmuLogic does hereby remise, release and discharge Xenova and Cantab,
and each of its predecessors, successors, assigns, subsidiaries, affiliates, officers, employees, representatives and agents, from and against any and all claims, demands, debts, accounts, contracts, obligations, liabilities, actions and causes of
action, whether in law or in equity, and of any kind or nature, which ImmuLogic had, now has or hereafter may have directly or indirectly arising out of or in any way relating to the Purchase Documents or the Letter Agreement. 
  
 (c) Each of Xenova and Cantab does hereby remise, release and discharge
ImmuLogic and each of its predecessors, successors, assigns, subsidiaries, affiliates, officers, employees, representatives, trustees and agents, from and against any and all claims, demands, debts, accounts, contracts, obligations, liabilities,
actions and causes of action, whether in law or in equity, and of any kind or nature, which Xenova or Cantab had, now has or hereafter 

 may have directly or indirectly arising out of or in any way relating to the Purchase Documents or the Letter Agreement.

  
 (d) Xenova, on behalf of itself and Cantab, will immediately
notify the American Arbitration Association (“AAA”) that the disputes between the parties have been resolved and that Xenova is withdrawing its Demand for Arbitration in Xenova Group plc vs. ImmuLogic Pharmaceutical Corp.,
AAA Ref. No. 50 T 180 00423 02 (the “Arbitration Proceeding”), with each party to bear its own costs and fees. It is understood, however, that if the AAA refunds all or any portion of the filing fee paid by Xenova when it commenced
the Arbitration Proceeding, such refund will belong solely to Xenova. 
  
 2. Certain Representations and Warranties of ImmuLogic. ImmuLogic hereby represents, warrants and covenants to Xenova and Cantab as follows: 
  
 (a) The Trust is a trust duly created under the laws of Delaware. Keith D. Lowey (the “Trustee”) is the sole trustee of the Trust, duly
appointed and acting pursuant to the terms of that certain ImmuLogic Pharmaceutical Corporation Liquidating Trust Agreement, dated August 27, 2002, between the Trustee and the Corporation. The Corporation is a corporation duly incorporated and
validly existing under the laws of the State of Delaware 
  
 (b)
The Trustee has the requisite power and authority to enter into this Termination and Release Agreement and the Assignment and Power of Attorney in the form attached hereto as Schedule 1 (the “Assignment and Power”) on behalf of the
Trust and to carry out its obligations hereunder and thereunder. The Corporation has the requisite power and authority to enter into this Termination and Release Agreement and the Assignment and Power and to carry out its obligations hereunder and
thereunder. No other proceedings are or will be necessary to authorize this Termination and Release Agreement and the Assignment and Power and the transactions contemplated hereby and thereby on behalf of the Trust or ImmuLogic. This Termination and
Release Agreement and the Assignment and Power have been duly executed and delivered by the Trustee on behalf of the Trust and by the Corporation and constitute legal, valid and binding obligations of ImmuLogic enforceable against it in accordance
with its terms. 
  
 (c) Neither the execution and the delivery of
this Termination and Release Agreement and the Assignment and Power by ImmuLogic, nor the mutual releases exchanged herein, will violate, or result in a breach of any provision of, require any consent or approval under, or constitute a default (or
an event which, with notice or lapse of time or both, would constitute a default) under any terms, conditions or provisions of the Trust’s or the Corporation’s governing documents or any judgement, order, writ, decree, statute, rule,
regulation or agreement to which it is subject, or by which either of them is bound. 
  
 3. Representations and Warranties of Xenova. Each of Xenova and Cantab hereby represents and warrants to ImmuLogic as follows: 
  
 (a) It is a company duly incorporated and validly existing under the laws of England and has the requisite corporate power
and authority to carry on its business as it is now being conducted. 
  

 2 

 (b) It has the requisite corporate power and authority to enter into this Termination and Release
Agreement and to carry out its obligations hereunder. This Termination and Release Agreement has been duly authorized by it and no other corporate proceedings are or will be necessary to authorize this Termination and Release Agreement and the
transactions contemplated hereby on its behalf. This Termination and Release Agreement has been duly executed and delivered by it and constitutes its legal, valid and binding obligation enforceable against it in accordance with its terms.

  
 (c) Neither the execution and the delivery of this
Termination and Release Agreement by it, nor the mutual releases exchanged herein, will violate, or result in a breach of any provision of, require any consent or approval under, or constitute a default (or an event which, with notice or lapse of
time or both, would constitute a default) under any terms, conditions or provisions of it’s governing documents or any judgement, order, writ, decree, statute, rule, regulation or agreement to which it is subject, or by which it is bound.

  
 4. Public Announcements. Xenova will issue a press
release substantially in the form attached hereto as Schedule 2. Except as may be required by applicable law, court process or the requirements of the Nasdaq Stock Market or the London Stock Exchange, Xenova and ImmuLogic will consult with each
other before issuing, and provide each other the opportunity to review and comment upon, any other press release or other public statements with regard to the Purchase Documents, the Letter Agreement, this Termination and Release Agreement or the
Assignment and Power. 
  
 5. Arbitration. In the event that
there shall be a dispute among the parties arising out of or relating to this Termination and Release Agreement or the Assignment and Power and the transactions contemplated hereby or thereby, the parties agree that such dispute shall be resolved by
final and binding arbitration in New York, New York, in accordance with the Commercial Arbitration Rules of the American Arbitration Association or such other procedures as the parties may agree to. Depositions may be taken and other discovery may
be obtained during such arbitration proceedings to the same extent as authorized in civil judicial proceedings. Any award issued as a result of such arbitration shall be final and binding among the parties thereto, and shall be enforceable by any
court having jurisdiction over the party against whom enforcement is sought. The fees and expenses of such arbitration (including reasonable attorneys’ fees) or any action to enforce an arbitration award shall be paid by the party that does not
prevail in such arbitration. 
  
 6. Miscellaneous. This
Termination and Release Agreement represents the entire understanding of the parties with respect to the subject matter contained herein. This Termination and Release Agreement may not be amended, modified or waived except in a writing signed by the
party against whom enforcement of such amendment, modification or waiver is sought. This Termination and Release Agreement shall be construed and interpreted in accordance with the internal laws of the State of New York, without reference to the
conflict of laws principles thereof. This Termination and Release Agreement may be executed in one or more counterparts, each of which shall be deemed an original, but all of which, when taken together shall constitute one and the same instrument.

  

 3 

 IN WITNESS WHEREOF, the undersigned have entered into this Termination and Release Agreement as of the
day and year first above written. 
  

	IMMULOGIC PHARMACEUTICAL CORPORATION LIQUIDATING TRUST
		
	 By
	 	 /s/ Keith D. Lowey

	 	 	 Name: Keith D. Lowey
 Title: Trustee

  

	IMMULOGIC PHARMACEUTICAL CORPORATION
		
	 By
	 	 /s/ J. Richard Crowley

	 	 	 Name: J. Richard Crowley
 Title: President

  

	XENOVA GROUP PLC
		
	 By
	 	 /s/ Daniel Abrams

	 	 	 Name: Daniel Abrams
 Title: Finance Director

  

	CANTAB PHARMACEUTICALS LTD.
		
	 By
	 	 /s/ David Oxlade

	 	 	 Name: David Oxlade
 Title: Director

  

 4

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