OPTION GRANTOR/OPTION HOLDER STOCK OPTION
                          AND TRIGGER PAYMENT AGREEMENT


             This STOCK OPTION AGREEMENT, dated as of November 10, 1995 (the
   "Agreement") by and among IES Industries Inc., a corporation organized
   under the laws of the State of Iowa ("OPTION GRANTOR" or the "Company")
   and Interstate Power Company, a corporation organized under the laws of
   the State of Delaware ("OPTION HOLDER").

                         W I T N E S S E T H   T H A T:

             WHEREAS, concurrently with the execution and delivery of this
   Agreement, OPTION GRANTOR, OPTION HOLDER, WPL Holdings, Inc., a
   corporation organized under the laws of the State of Wisconsin ("WPL"),
   and AMW Acquisition, Inc., a wholly-owned subsidiary of WPL organized
   under the laws of the State of Delaware ("AMW"), are entering into an
   Agreement and Plan of Merger, dated as of November 10, 1995, (the "Merger
   Agreement"), which provides, inter alia, upon the terms and subject to the
   conditions thereof, for the merger of OPTION GRANTOR with and into WPL in
   accordance with the laws of the States of Wisconsin and Iowa (the "IES
   Merger"), and the merger of AMW with and into OPTION HOLDER in accordance
   with the laws of the State of Delaware (the "Interstate Merger", and
   together with the IES Merger, the "Merger");

             WHEREAS, in connection with the execution of the Merger
   Agreement, OPTION GRANTOR, OPTION HOLDER and WPL are entering into certain
   stock option agreements dated as of the date hereof, of which this
   Agreement is one, whereby the parties hereto grant each other an option
   with respect to certain shares of each other's common stock on the terms
   and subject to the conditions set forth therein (the "Stock Option
   Agreements"); and

             WHEREAS, as a condition to OPTION HOLDER's willingness to enter
   into the Merger Agreement, OPTION HOLDER has requested that OPTION GRANTOR
   agree, and OPTION GRANTOR has so agreed, to grant to OPTION HOLDER an
   option with respect to certain shares of OPTION GRANTOR's common stock, on
   the terms and subject to the conditions set forth herein;

             NOW, THEREFORE, to induce OPTION HOLDER to enter into the Merger
   Agreement and certain of the Stock Option Agreements, and in consideration
   of the representations, warranties, covenants and agreements contained
   herein, in the Merger Agreement and in the Stock Option Agreements to
   which OPTION GRANTOR and OPTION HOLDER are parties, the parties hereto,
   intending to be legally bound, hereby agree as follows:

             1.   GRANT OF OPTION.

             (a)  Subject to the receipt of all regulatory approvals and
   orders required by OPTION GRANTOR as set forth in Section 5.4(c) of the
   IES Disclosure Schedule to the Merger Agreement and by OPTION HOLDER as
   set forth in Section 6.4(c) of the Interstate Disclosure Schedule to the
   Merger Agreement, OPTION GRANTOR hereby grants OPTION HOLDER an
   irrevocable option (the "OPTION GRANTOR Option") to purchase up to that
   number of shares, subject to adjustment as provided in Section 12 (the
   "OPTION GRANTOR Shares"), of common stock, no par value, of OPTION GRANTOR
   (the "OPTION GRANTOR Common Stock") equal to a percentage (the "Option
   Shares Percentage"), which Option Shares Percentage is equal to the OPTION
   HOLDER's Participation Percentage as defined below in subsection (e), of
   5,861,115 shares of OPTION GRANTOR Common Stock (being 19.9% of the number
   of shares of OPTION GRANTOR Common Stock issued and outstanding as of
   November 10, 1995, the "Initial Number") in the manner set forth below, at
   a price (the "Exercise Price") per OPTION GRANTOR Share of $26.7125 (which
   is equal to the Fair Market Value (as defined below) of a OPTION GRANTOR
   Share as of the date hereof).

             (b)  The Exercise Price shall be payable, at OPTION HOLDER's
   option, as follows:

                  (i)  in cash, or

                  (ii) subject to the receipt of all approvals of any
        Governmental Authority required for OPTION GRANTOR to acquire, and
        OPTION HOLDER to issue, the OPTION HOLDER Shares (as defined below)
        from OPTION HOLDER, in shares of common stock, $3.50 par value, of
        OPTION HOLDER ("OPTION HOLDER Shares"),

   in either case in accordance with Section 4 hereof.

             (c)  Notwithstanding the foregoing, in no event shall the number
   of OPTION GRANTOR Shares for which the OPTION GRANTOR Option is
   exercisable exceed the product of the Option Shares Percentage and the
   Initial Number, subject to adjustment as provided in Section 12.

             (d)  As used herein, the "Fair Market Value" of any share shall
   be the average of the daily closing sales price for such share on the New
   York Stock Exchange (the "NYSE") during the ten NYSE trading days prior to
   the fifth NYSE trading day preceding the date such Fair Market Value is to
   be determined.

             (e)  For purposes of this Agreement the term "Participation
   Percentage" shall have the same meaning as in Section 10.3(f)(i) of the
   Merger Agreement, except that the numerator and denominator shall be
   calculated based on the number of shares of WPL Common Stock which would
   be issuable (or, in the case of WPL, retained by its shareholders) on a
   fully diluted basis had the Effective Time occurred as of the date on
   which the Exercise Notice is delivered under Section 2 hereof or the date
   on which demand for the Trigger Payment (as defined herein) is given under
   Section 5 hereof, as the case may be.  Other capitalized terms used herein
   but not defined herein shall have the meanings set forth in the Merger
   Agreement.

             2.   EXERCISE OF OPTION.

             (a)  The OPTION GRANTOR Option may be exercised by OPTION
   HOLDER, in whole or in part, at any time or from time to time after the
   Merger Agreement becomes terminable by OPTION HOLDER under circumstances
   which could entitle OPTION HOLDER to a termination fee under Section
   10.3(a) of the Merger Agreement (provided that the events specified in
   Section 10.3(a)(ii)(A) of the Merger Agreement shall have occurred,
   although the events specified in Section 10.3(a)(ii)(B) thereof need not
   have occurred), or Section 10.3(b) of the Merger Agreement (regardless of
   whether the Merger Agreement is actually terminated or whether there
   occurs a closing of any Business Combination involving a Target Party or a
   closing by which a Target Party becomes a Subsidiary), any such event by
   which the Merger Agreement becomes so terminable by OPTION HOLDER being
   referred to herein as a "Trigger Event").

             (b)  (i)  OPTION GRANTOR shall notify OPTION HOLDER promptly in
        writing of the occurrence of any Trigger Event, it being understood
        that the giving of such notice by OPTION GRANTOR shall not be a
        condition to the right of OPTION HOLDER to exercise the OPTION
        GRANTOR Option.

                  (ii) In the event OPTION HOLDER wishes to exercise the
        OPTION GRANTOR Option, OPTION HOLDER shall deliver to OPTION GRANTOR
        written notice (an "Exercise Notice") specifying the total number of
        OPTION GRANTOR Shares it wishes to purchase.

                  (iii)     Upon the giving by OPTION HOLDER to OPTION
        GRANTOR of the Exercise Notice and the tender of the applicable
        aggregate Exercise Price, OPTION HOLDER, to the extent permitted by
        law and OPTION GRANTOR's organizational documents, and provided that
        the conditions to OPTION GRANTOR's obligation to issue the OPTION
        GRANTOR Shares to OPTION HOLDER hereunder set forth in Section 3 have
        been satisfied or waived, shall be deemed to be the holder of record
        of the OPTION GRANTOR Shares issuable upon such exercise,
        notwithstanding that the stock transfer books of OPTION GRANTOR shall
        then be closed or that certificates representing such OPTION GRANTOR
        Shares shall not then be actually delivered to OPTION HOLDER.

                  (iv) Each closing of a purchase of OPTION GRANTOR Shares (a
        "Closing") shall occur at a place, on a date, and at a time
        designated by OPTION HOLDER in an Exercise Notice delivered at least
        two business days prior to the date of the Closing.

             (c)  The OPTION GRANTOR Option shall terminate upon the earliest
   to occur of:

                  (i)  the Effective Time of the Merger;

                  (ii) the termination of the Merger Agreement pursuant to
        Section 10.1 thereof, other than under circumstances which also
        constitute a Trigger Event under this Agreement; 

                  (iii)     180 days following any termination of the Merger
        Agreement upon or during the continuance of a Trigger Event (or if,
        at the expiration of such 180 day period, the OPTION GRANTOR Option
        cannot be exercised by reason of any applicable judgment, decree,
        order, law or regulation, ten business days after such impediment to
        exercise shall have been removed or shall have become final and not
        subject to appeal, but in no event under this clause (iii) later than
        May 10, 1998); and

                  (iv) payment by OPTION GRANTOR of the Trigger Payment set
        forth in Section 5 of this Agreement to OPTION HOLDER.

             (d)  Notwithstanding the foregoing, the OPTION GRANTOR Option
   may not be exercised if (i) OPTION HOLDER is in material breach of any of
   its representations or warranties, or in material breach of any of its
   covenants or agreements, contained in this Agreement or in the Merger
   Agreement, or (ii) a Trigger Payment has been paid pursuant to Section 5
   of this Agreement or demand therefor has been made and not withdrawn.

             3.   CONDITIONS TO CLOSING.  The obligation of OPTION GRANTOR to
   issue the OPTION GRANTOR Shares to OPTION HOLDER hereunder is subject to
   the conditions that

             (a)  all waiting periods, if any, under the HSR Act applicable
   to the issuance and acquisition of the OPTION GRANTOR Shares hereunder
   shall have expired or have been terminated;

             (b)  the OPTION GRANTOR Shares, and any OPTION HOLDER Shares
   which are issued in payment of the Exercise Price, shall have been
   approved for listing on the NYSE subject only to official notice of
   issuance;

             (c)  all consents, approvals, orders or authorizations of, or
   registrations, declarations or filings with, any federal, state or local
   administrative agency or commission or other federal, state or local
   Governmental Authority, if any, required in connection with the issuance
   by OPTION GRANTOR and the acquisition by OPTION HOLDER of the OPTION
   GRANTOR Shares hereunder shall have been obtained or made, including,
   without limitation, the approval of the SEC under Sections 9 and 10 of the
   Public Utility Holding Company Act of 1935, as amended (the "1935 Act"),
   the approval of Iowa Utilities Board of the issuance of the OPTION GRANTOR
   Shares by OPTION GRANTOR and, if applicable, the acquisition of OPTION
   GRANTOR Shares by OPTION HOLDER, and the approval of the Iowa Utilities
   Board, the Minnesota Public Utilities Commission and the Illinois Commerce
   Commission of the acquisition of the OPTION GRANTOR Shares by OPTION
   HOLDER and, if applicable, the acquisition by OPTION GRANTOR of the OPTION
   HOLDER Shares constituting the Exercise Price hereunder; and

             (d)  no preliminary or permanent injunction or other order by
   any court of competent jurisdiction prohibiting or otherwise restraining
   such issuance shall be in effect.

   The condition set forth in paragraph (b) above may be waived by OPTION
   GRANTOR, in the case of OPTION HOLDER Shares, and by OPTION HOLDER, in the
   case of OPTION GRANTOR Shares, in the sole discretion of the waiving
   party.

             4.   CLOSING.  At any Closing,

             (a)  OPTION GRANTOR shall deliver to OPTION HOLDER or its
   designee a single certificate in definitive form representing the number
   of OPTION GRANTOR Shares designated by OPTION HOLDER in its Exercise
   Notice, such certificate to be registered in the name of OPTION HOLDER and
   to bear the legend set forth in Section 13; and

             (b)  OPTION HOLDER shall deliver to OPTION GRANTOR the aggregate
   price for the OPTION GRANTOR Shares so designated and being purchased by

                  (i)  wire transfer of immediately available funds or
        certified check or bank check, or

                  (ii) subject to the condition in Section 1(b)(ii), delivery
        of a certificate or certificates representing the number of OPTION
        HOLDER Shares being issued by OPTION HOLDER in consideration thereof,
        determined in accordance with Section 4(c).

             (c)  In the event that OPTION HOLDER issues OPTION HOLDER Shares
   to OPTION GRANTOR in consideration of OPTION GRANTOR Shares pursuant to
   Section 4(b)(ii), the number of OPTION HOLDER Shares to be so issued shall
   be equal to the quotient obtained by dividing:

                  (i)  the product of (x) the number of OPTION GRANTOR Shares
        with respect to which the OPTION GRANTOR Option is being exercised
        and (y) the Exercise Price, by

                  (ii) the Fair Market Value of the OPTION HOLDER Shares as
        of the date immediately preceding the date the Exercise Notice is
        delivered to OPTION GRANTOR.

             (d)  OPTION GRANTOR shall pay all expenses, and any and all
   Federal, state and local taxes and other charges that may be payable in
   connection with the preparation, issue and delivery of stock certificates
   under this Section 4.

             5.   TRIGGER PAYMENT.

             (a)  Trigger Payment.  Subject to the provisions of Section
   10.3(e) of the Merger Agreement, if a Trigger Event shall have occurred
   and any regulatory approval or order required for the issuance by OPTION
   GRANTOR, or the acquisition by OPTION HOLDER, of the OPTION GRANTOR Option
   pursuant to Section 1 hereof shall not have been obtained, OPTION HOLDER
   shall have the right to receive, and OPTION GRANTOR shall pay to OPTION
   HOLDER, an amount (the "Trigger Payment") equal to the product of

        (i)  the maximum number of OPTION GRANTOR Shares that would have been
        subject to purchase by OPTION HOLDER upon exercise of the OPTION
        GRANTOR Option pursuant to Sections 1 and 2 hereof if all such
        regulatory approvals or orders had been obtained, and

        (ii)  the difference between (A) the Market/Offer Price (as defined
        herein), determined as of the date on which notice of demand for the
        Trigger Payment is given by OPTION HOLDER, and (B) the Exercise Price
        (but only if such Market/Offer Price is higher than such Exercise
        Price).

   Demand for the Trigger Payment shall be given by notice in accordance with
   the provisions of Section 17 hereof.  The Trigger Payment shall be paid to
   OPTION HOLDER by OPTION GRANTOR on the Payment Date (as defined herein),
   by wire transfer of immediately available funds to an account to be
   designated in writing by OPTION HOLDER not less than two business days
   before the Payment Date.

             (b)  Payment Date.  For purposes of this Section 5, "Payment
   Date" means the date on which termination fees are required to be paid by
   OPTION GRANTOR to OPTION HOLDER under Sections 10.3(a) or 10.3(b), as the
   case may be, of the Merger Agreement as a result of the occurrence of the
   Trigger Event referred to in subsection (a) of this Section 5.

             (c)  Certain Conditions.  OPTION GRANTOR shall have no
   obligation to pay the Trigger Payment if OPTION HOLDER is in material
   breach of any of its representations or warranties, or in material breach
   of any of its covenants or agreements, contained in this Agreement or in
   the Merger Agreement.

             6.   REPRESENTATIONS AND WARRANTIES OF OPTION GRANTOR.  OPTION
   GRANTOR represents and warrants to OPTION HOLDER that

             (a)  Except as set forth in Section 5.4(a) of the IES Disclosure
   Schedule to the Merger Agreement, OPTION GRANTOR has the corporate power
   and authority to enter into this Agreement and to carry out its
   obligations hereunder, subject in the case of the repurchase of the OPTION
   GRANTOR Shares pursuant to Section 8(a) to applicable law and the
   provisions of OPTION GRANTOR's Articles of Incorporation, as amended (the
   "OPTION GRANTOR Articles");

             (b)  this Agreement has been duly and validly executed and
   delivered by OPTION GRANTOR, and, assuming the due authorization,
   execution and delivery hereof by OPTION HOLDER and the receipt of all
   required regulatory approvals, constitutes a valid and binding obligation
   of OPTION GRANTOR, enforceable against OPTION GRANTOR in accordance with
   its terms, except as may be limited by applicable bankruptcy, insolvency,
   reorganization or other similar laws affecting the enforcement of
   creditors' rights generally, and except that the availability of equitable
   remedies, including specific performance, may be subject to the discretion
   of any court before which any proceeding therefor may be brought;

             (c)  OPTION GRANTOR has taken all necessary corporate action to
   authorize and reserve for issuance and to permit it to issue, upon
   exercise of the OPTION GRANTOR Option, and at all times from the date
   hereof through the expiration of the OPTION GRANTOR Option will have
   reserved, the Initial Number of authorized and unissued OPTION GRANTOR
   Shares, such amount being subject to adjustment as provided in Section 12,
   all of which, upon their issuance and delivery in accordance with the
   terms of this Agreement, will be duly authorized, validly issued, fully
   paid and nonassessable;

             (d)  upon delivery of the OPTION GRANTOR Shares to OPTION HOLDER
   upon the exercise of the OPTION GRANTOR Option, OPTION HOLDER will acquire
   the OPTION GRANTOR Shares free and clear of all claims, liens, charges,
   encumbrances and security interests of any nature whatsoever;

             (e)  except as described in Section 5.4(b) of the IES Disclosure
   Schedule to the Merger Agreement, the execution and delivery of this
   Agreement by OPTION GRANTOR does not, and, subject to compliance with
   applicable law and the OPTION GRANTOR Articles with respect to the
   repurchase of the OPTION GRANTOR Shares pursuant to Section 8(a), the
   consummation by OPTION GRANTOR of the transactions contemplated hereby
   will not, violate, conflict with, or result in a breach of any provision
   of, or constitute a default (with or without notice or a lapse of time, or
   both) under, or result in the termination of, or accelerate the
   performance required by, or result in a right of termination,
   cancellation, or acceleration of any obligation or the loss of a material
   benefit under, or the creation of a lien, pledge, security interest or
   other encumbrance on assets (any such conflict, violation, default, right
   of termination, cancellation, acceleration, loss or creation, hereinafter
   a "Violation") of OPTION GRANTOR or any of its Subsidiaries, pursuant to

                (i)    any provision of the OPTION GRANTOR Articles or the
             Bylaws of OPTION GRANTOR,

               (ii)    any provisions of any material loan or credit
             agreement, note, mortgage, indenture, lease, benefit plan or
             other agreement, obligation, instrument, permit, concession,
             franchise or license (any of the foregoing in effect on the date
             hereof being referred to as a "Material Contract") of OPTION
             GRANTOR or its subsidiaries or to which any of them is a party,
             or

              (iii)    any judgment, order, decree, statute, law, ordinance,
             rule or regulation applicable to OPTION GRANTOR or its
             properties or assets,

   which Violation, in the case of each clauses (ii) and (iii), could
   reasonably be expected to have an OPTION GRANTOR Material Adverse Effect
   (except that no representation or warranty is given concerning any
   Violation of a Material Contract with respect to the repurchase of OPTION
   GRANTOR Shares pursuant to Section 8(a));

             (f)  except as described in Section 5.4(c) of the IES Disclosure
   Schedule to the Merger Agreement or Section 1 or 3 hereof, the execution
   and delivery of this Agreement by OPTION GRANTOR does not, and the
   performance of this Agreement by OPTION GRANTOR will not, require any
   consent, approval, authorization or permit of, filing with or notification
   to, any Governmental Authority;

             (g)  none of OPTION GRANTOR, any of its affiliates or anyone
   acting on its or their behalf, has issued, sold or offered any security of
   OPTION GRANTOR to any person under circumstances that would cause the
   issuance and sale of OPTION GRANTOR Shares, as contemplated by this
   Agreement, to be subject to the registration requirements of the
   Securities Act as in effect on the date hereof, and, assuming the
   representations and warranties of OPTION HOLDER contained in Section 7(g)
   are true and correct, the issuance, sale and delivery of the OPTION
   GRANTOR Shares hereunder would be exempt from the registration and
   prospectus delivery requirements of the Securities Act, as in effect on
   the date hereof (and OPTION GRANTOR shall not take any action which would
   cause the issuance, sale, and delivery of OPTION GRANTOR Shares hereunder
   not to be exempt from such requirements); and

             (h)  any OPTION HOLDER Shares acquired pursuant to this
   Agreement will be acquired for OPTION GRANTOR's own account, for
   investment purposes only, and will not be acquired by OPTION GRANTOR with
   a view to the public distribution thereof in violation of any applicable
   provision of the Securities Act.

             7.   REPRESENTATIONS AND WARRANTIES OF OPTION HOLDER.  OPTION
   HOLDER represents and warrants to OPTION GRANTOR that

             (a)  Except as set forth in Schedule 6.4(a) of the Interstate
   Disclosure Schedule to the Merger Agreement, OPTION HOLDER has the
   corporate power and authority to enter into this Agreement and to carry
   out its obligations hereunder;

             (b)  this Agreement has been duly and validly executed and
   delivered by OPTION HOLDER and, assuming the due authorization, execution
   and delivery hereof by OPTION GRANTOR and the receipt of all required
   regulatory approvals, constitutes a valid and binding obligation of OPTION
   HOLDER, enforceable against OPTION HOLDER in accordance with its
   respective terms, except as may be limited by applicable bankruptcy,
   insolvency, reorganization, or other similar laws affecting the
   enforcement of creditors' rights generally, and except that the
   availability of equitable remedies, including specific performance, may be
   subject to the discretion of any court before which any proceeding may be
   brought;

             (c)  prior to any delivery of OPTION HOLDER Shares in
   consideration of the purchase of OPTION GRANTOR Shares pursuant hereto,
   OPTION HOLDER will have taken all necessary corporate action to authorize
   for issuance and to permit it to issue such OPTION HOLDER Shares, all of
   which, upon their issuance and delivery in accordance with the terms of
   this Agreement, will be duly authorized, validly issued, fully paid and
   nonassessable;

             (d)  upon any delivery of such OPTION HOLDER Shares to OPTION
   GRANTOR in consideration of the purchase of OPTION GRANTOR Shares pursuant
   hereto, OPTION GRANTOR will acquire the OPTION HOLDER Shares free and
   clear of all claims, liens, charges, encumbrances and security interests
   of any nature whatsoever;

             (e)  except as described in Section 6.4(b) of the Interstate
   Disclosure Schedule to the Merger Agreement, the execution and delivery of
   this Agreement by OPTION HOLDER does not, and the consummation by OPTION
   HOLDER of the transactions contemplated hereby will not, violate, conflict
   with, or result in the breach of any provision of, or constitute a default
   (with or without notice or a lapse of time, or both) under, or result in
   any Violation by OPTION HOLDER or any of its Subsidiaries, pursuant to

                (i)         any provision of the Articles of Incorporation or
             Bylaws of OPTION HOLDER,

               (ii)         any Material Contract of OPTION HOLDER or any of
             its subsidiaries or to which any of them is a party, or

              (iii)         any judgment, order, decree, statute, law,
             ordinance, rule or regulation applicable to OPTION HOLDER or its
             properties or assets,

   which Violation, in the case of each of clauses (ii) or (iii), would have
   an OPTION HOLDER Material Adverse Effect;

             (f)  except as described in Section 6.4(c) of the Interstate
   Disclosure Schedule to the Merger Agreement or Section 1 or 3 hereof, the
   execution and delivery of this Agreement by OPTION HOLDER does not, and
   the consummation by OPTION HOLDER of the transactions contemplated hereby
   will not, require any consent, approval, authorization or permit of,
   filing with or notification to, any Governmental Authority; and

             (g)  any OPTION GRANTOR Shares acquired upon exercise of the
   OPTION GRANTOR Option will be acquired for OPTION HOLDER's own account,
   for investment purposes only and will not be, and the OPTION GRANTOR
   Option is not being, acquired by OPTION HOLDER with a view to the public
   distribution thereof, in violation of any applicable provision of the
   Securities Act.

             8.   CERTAIN REPURCHASES.

             (a)  OPTION HOLDER "PUT".  At the request of OPTION HOLDER by
   written notice (x) at any time during which the OPTION GRANTOR Option is
   exercisable pursuant to Section 2 (the "Repurchase Period"), OPTION
   GRANTOR (or any successor entity thereof) shall, if permitted by
   applicable law, the OPTION GRANTOR Articles and Bylaws and OPTION
   GRANTOR's Material Contracts, repurchase from OPTION HOLDER all or any
   portion of the OPTION GRANTOR Option, at the price set forth in
   subparagraph (i) below, or, (y) at any time prior to May 10, 1997
   (provided that such date shall be extended to May 10, 1998 under the
   circumstances where the date after which either party may terminate the
   Merger Agreement pursuant to Section 10.1(b) of the Merger Agreement has
   been extended to May 10, 1998), OPTION GRANTOR (or any successor entity
   thereof) shall, if permitted by applicable law, the OPTION GRANTOR
   Articles and Bylaws and OPTION GRANTOR's Material Contracts, repurchase
   from OPTION HOLDER all or any portion of the OPTION GRANTOR Shares
   purchased by OPTION HOLDER pursuant to the OPTION GRANTOR Option, at the
   price set forth in subparagraph (ii) below:

                (i)  (A) The difference between the "Market/Offer Price" (as
        defined below) for shares of OPTION GRANTOR Common Stock as of the
        date OPTION HOLDER gives notice of its intent to exercise its rights
        under this Section 8 and the Exercise Price, multiplied by the number
        of OPTION GRANTOR Shares purchasable pursuant to the OPTION GRANTOR
        Option (or portion thereof with respect to which OPTION HOLDER is
        exercising its rights under this Section 8), but only if the
        Market/Offer Price is greater than the Exercise Price.

                     (B) for purposes of this Agreement, "Market/Offer
        Price") shall mean, as of any date, the higher of (I) the price per
        share offered as of such date pursuant to any tender or exchange
        offer or other offer with respect to a Business Combination involving
        OPTION GRANTOR as the Target Party which was made prior to such date
        and not terminated or withdrawn as of such date and (II) the Fair
        Market Value of OPTION GRANTOR Common Stock as of such date.

               (ii)  (A) the product of (I) the sum of (a) the Exercise
        Price paid by OPTION HOLDER per OPTION GRANTOR Share acquired
        pursuant to the OPTION GRANTOR Option, and (b) the difference between
        the "Offer Price" (as defined below) and the Exercise Price, but only
        if the offer Price is greater that the Exercise Price, and (II) the
        number of OPTION GRANTOR Shares so to be repurchased pursuant to this
        Section 8.

                     (B) For purposes of this clause (ii), the "Offer Price"
        shall be the highest price per share offered pursuant to a tender or
        exchange offer or other Business Combination offer involving OPTION
        GRANTOR as the Target Party during the Repurchase Period prior to the
        delivery by OPTION HOLDER of a notice of repurchase.

             (b)  REDELIVERY OF OPTION HOLDER SHARES.  If OPTION HOLDER shall
   have previously elected to purchase OPTION GRANTOR Shares pursuant to the
   exercise of the OPTION GRANTOR Option by the issuance and delivery of
   OPTION HOLDER Shares, then OPTION GRANTOR shall, if so requested by OPTION
   HOLDER, in fulfillment of its obligation pursuant to Section 8(a)(y) (that
   is, with respect to the Exercise Price only and without limitation to its
   obligation to pay additional consideration under clause (b) of Section
   8(a)(ii)(A)(I)), redeliver the certificates for such OPTION HOLDER Shares
   to OPTION HOLDER, free and clear of all liens, claims, charges and
   encumbrances of any kind or nature whatsoever; provided, however, that if
   at any time less than all of the OPTION GRANTOR Shares so purchased by
   OPTION HOLDER pursuant to the OPTION GRANTOR Option are to be repurchased
   by OPTION GRANTOR pursuant to Section 8(a)(y), then (i) OPTION GRANTOR
   shall be obligated to redeliver to OPTION HOLDER the same proportion of
   such OPTION HOLDER Shares as the number of OPTION GRANTOR Shares that
   OPTION GRANTOR is then obligated to repurchase bears to the number of
   OPTION GRANTOR Shares acquired by OPTION HOLDER upon exercise of the
   OPTION GRANTOR Option and (ii) OPTION HOLDER shall issue to OPTION GRANTOR
   new certificates representing those OPTION HOLDER Shares which are not due
   to be redelivered to OPTION HOLDER pursuant to this Section 8(b) to the
   extent that excess OPTION HOLDER Shares are included in the certificates
   redelivered to OPTION HOLDER by OPTION GRANTOR.

             (c)  PAYMENT AND REDELIVERY OF OPTION GRANTOR OPTIONS OR SHARES. 
   In the event OPTION HOLDER exercises its rights under this Section 8,
   OPTION GRANTOR shall, within ten business days thereafter, pay the
   required amount to OPTION HOLDER in immediately available funds and OPTION
   HOLDER shall surrender to OPTION GRANTOR the OPTION GRANTOR Option or the
   certificate or certificates evidencing the OPTION GRANTOR Shares purchased
   by OPTION HOLDER pursuant hereto, and OPTION HOLDER shall warrant that it
   owns the OPTION GRANTOR Option or such shares and that the OPTION GRANTOR
   Option or such shares are then free and clear of all liens, claims,
   damages, charges and encumbrances of any kind or nature whatsoever.

             (d)  OPTION HOLDER "CALL".  If OPTION HOLDER has elected to
   purchase OPTION GRANTOR Shares pursuant to the exercise of the OPTION
   GRANTOR Option by the issuance and delivery of OPTION HOLDER Shares,
   notwithstanding that OPTION HOLDER may no longer hold any such OPTION
   GRANTOR Shares or that OPTION HOLDER elects not to exercise its other
   rights under this Section 8, OPTION HOLDER may require, at any time or
   from time to time prior to May 10, 1997 (provided that such date shall be
   extended to May 10, 1998 under the circumstances where the date after
   which either party may terminate the Merger Agreement pursuant to Section
   10.1(b) of the Merger Agreement has been extended to May 10, 1998), OPTION
   GRANTOR to sell to OPTION HOLDER any such OPTION HOLDER Shares at the
   price attributed to such OPTION HOLDER Shares pursuant to Section 4 plus
   interest at the rate of 8.75% per annum on such amount from the Closing
   Date relating to the exchange of such OPTION HOLDER Shares pursuant to
   Section 4 to the Closing Date under this Section 8(d) less any dividends
   on such OPTION HOLDER Shares paid during such period or declared and
   payable to stockholders of record on a date during such period.

             (e)  REPURCHASE PRICE REDUCED AT OPTION HOLDER'S OPTION.  In the
   event the repurchase price specified in Section 8(a) would subject the
   purchase of the OPTION GRANTOR Option or the OPTION GRANTOR Shares
   purchased by OPTION HOLDER pursuant to the OPTION GRANTOR Option to a vote
   of the shareholders of OPTION GRANTOR pursuant to applicable law or the
   OPTION GRANTOR Articles, then OPTION HOLDER may, at its election, reduce
   the repurchase price to an amount which would permit such repurchase
   without the necessity for such a shareholder vote.

             9.   VOTING OF SHARES.  Following the date hereof and prior to
   the fifth anniversary of the date hereof (the "Expiration Date"), each
   party shall vote any shares of capital stock of the other party acquired
   by such party pursuant to this Agreement ("Restricted Shares"), including
   any OPTION HOLDER Shares issued pursuant to Section 1(b), or otherwise
   beneficially owned (within the meaning of Rule 13d-3 promulgated under the
   Securities Exchange Act of 1934, as amended (the "Exchange Act")), by such
   party on each matter submitted to a vote of shareholders of such other
   party for and against such matter in the same proportion as the vote of
   all other shareholders of such other party are voted (whether by proxy or
   otherwise) for and against such matter.

             10.  RESTRICTIONS ON TRANSFER.

             (a)  RESTRICTIONS ON TRANSFER.  Prior to the Expiration Date,
   neither party shall, directly or indirectly, by operation of law or
   otherwise, sell, assign, pledge, or otherwise dispose of or transfer any
   Restricted Shares beneficially owned by such party, other than (i)
   pursuant to Section 8, or (ii) in accordance with Section 10(b) or Section
   11.

             (b)  PERMITTED SALES.  Following the termination of the Merger
   Agreement, a party shall be permitted to sell any Restricted Shares
   beneficially owned by it if such sale is made pursuant to a tender or
   exchange offer that has been approved or recommended, or otherwise
   determined to be fair to and in the best interests of the shareholders of
   the other party, by a majority of the members of the Board of Directors of
   such other party, which majority shall include a majority of directors who
   were directors prior to the announcement of such tender or exchange offer.

             11.  REGISTRATION RIGHTS.

             (a)  Following the termination of the Merger Agreement, either
   party hereto that owns Restricted Shares (a "Designated Holder") may by
   written notice (the "Registration Notice") to the other party (the
   "Registrant") request the Registrant to register under the Securities Act
   all or any part of the Restricted Shares beneficially owned by such
   Designated Holder (the "Registrable Securities") pursuant to a bona fide
   firm commitment underwritten public offering, in which the Designated
   Holder and the underwriters shall effect as wide a distribution of such
   Registrable Securities as is reasonably practicable and shall use their
   best efforts to prevent any person (including any Group (as used in Rule
   13d-5 under the Exchange Act)) and its affiliates from purchasing through
   such offering Restricted Shares representing more than 1% of the
   outstanding shares of common stock of the Registrant on a fully diluted
   basis (a "Permitted Offering").

             (b)  The Registration Notice shall include a certificate
   executed by the Designated Holder and its proposed managing underwriter,
   which underwriter shall be an investment banking firm of nationally
   recognized standing (the "Manager"), stating that

                  (i)  they have a good faith intention to commence promptly
        a Permitted Offering, and

                  (ii)  the manager in good faith believes that, based on the
        then-prevailing market conditions, it will be able to sell the
        Registrable Securities at a per share price equal to at least 80% of
        the then Fair Market Value of such shares.

             (c)  The Registrant (and/or any person designated by the
   Registrant) shall thereupon have the option exercisable by written notice
   delivered to the Designated Holder within ten business days after the
   receipt of the Registration Notice, irrevocably to agree to purchase all
   or any part of the Registrable Securities proposed to be so sold for cash
   at a price (the "Option Price") equal to the product of (i) the number of
   Registrable Securities to be so purchased by the Registrant and (ii) the
   then Fair Market Value of such shares.

             (d)  Any purchase of Registrable Securities by the Registrant
   (or its designee) under Section 11(c) shall take place at a closing to be
   held at the principal executive offices of the Registrant or at the
   offices of its counsel at any reasonable date and time designated by the
   Registrant and/or such designee in such notice within twenty business days
   after delivery of such notice, and any payment for the shares to be so
   purchased shall be made by delivery at the time of such closing in
   immediately available funds.

             (e)  If the Registrant does not elect to exercise its option
   pursuant to this Section 11 with respect to all Registrable Securities, it
   shall use its best efforts to effect, as promptly as practicable, the
   registration under the Securities Act of the unpurchased Registrable
   Securities proposed to be so sold; provided, however, that

                  (i)  neither party shall be entitled to demand more than an
        aggregate of two effective registration statements hereunder, and

                  (ii)  the Registrant will not be required to file any such
        registration statement during any period of time (not to exceed 40
        days after such request in the case of clause (A) below or 90 days in
        the case of clauses (B) and (C) below) when

                     (A)  the Registrant is in possession of material non-
             public information which it reasonably believes would be
             detrimental to be disclosed at such time and, in the opinion of
             counsel to the Registrant, such information would be required to
             be disclosed if a registration statement were filed at that
             time;

                     (B)  the Registrant is required under the Securities Act
             to include audited financial statements for any period in such
             registration statement and such financial statements are not yet
             available for inclusion in such registration statement; or

                     (C)  the Registrant determines, in its reasonable
             judgment, that such registration would interfere with any
             financing, acquisition or other material transaction involving
             the Registrant or any of its affiliates.

             (f)  The Registrant shall use its reasonable best efforts to
   cause any Registrable Securities registered pursuant to this Section 11 to
   be qualified for sale under the securities or Blue Sky laws of such
   jurisdictions as the Designated Holder may reasonably request and shall
   continue such registration or qualification in effect in such
   jurisdiction; provided, however, that the Registrant shall not be required
   to qualify to do business in, or consent to general service of process in,
   any jurisdiction by reason of this provision.

             (g)  The registration rights set forth in this Section 11 are
   subject to the condition that the Designated Holder shall provide the
   Registrant with such information with respect to such holder's Registrable
   Securities, the plans for the distribution thereof, and such other
   information with respect to such holder as, in the reasonable judgment of
   counsel for the Registrant, is necessary to enable the Registrant to
   include in such registration statement all material facts required to be
   disclosed with respect to a registration thereunder.

             (h)  A registration effected under this Section 11 shall be
   effected at the Registrant's expense, except for underwriting discounts
   and commissions and the fees and the expenses of counsel to the Designated
   Holder, and the Registrant shall provide to the underwriters such
   documentation (including certificates, opinions of counsel and "comfort"
   letters from auditors) as is customary in connection with underwritten
   public offerings as such underwriters may reasonably require.

             (i)  In connection with any registration effected under this
   Section 11, the parties agree

                  (i) to indemnify each other and the underwriters in the
        customary manner,

                 (ii) to enter into an underwriting agreement in form and
        substance customary for transactions of such type with the Manager
        and the other underwriters participating in such offering, and

                (iii) to take all further actions which shall be reasonably
        necessary to effect such registration and sale (including if the
        Manager deems it necessary, participating in road-show
        presentations).

             (j)  The Registrant shall be entitled to include (at its
   expense) additional shares of its common stock in a registration effected
   pursuant to this Section 11 only if and to the extent the Manager
   determines that such inclusion will not adversely affect the prospects for
   success of such offering.

             12.  ADJUSTMENT UPON CHANGES IN CAPITALIZATION.  Without
   limitation to any restriction on OPTION GRANTOR contained in this
   Agreement or in the Merger Agreement, in the event of any change in OPTION
   GRANTOR Common Stock by reason of stock dividends, splitups, mergers
   (other than the Merger), recapitalizations, combinations, exchange of
   shares or the like, the type and number of shares or securities subject to
   the OPTION GRANTOR Option, and the purchase price per share provided in
   Section 1, shall be adjusted appropriately to restore to OPTION HOLDER its
   rights hereunder, including the right to purchase from OPTION GRANTOR (or
   its successors) shares of OPTION GRANTOR Common Stock (or such other
   shares or securities into which OPTION GRANTOR Common Stock has been so
   changed) representing the Option Shares Percentage of the Initial Number
   of shares of OPTION GRANTOR Common Stock for the aggregate Exercise Price
   calculated as of the date of this Agreement as provided in Section 1.

             13.  RESTRICTIVE LEGENDS.  Each certificate representing OPTION
   GRANTOR Shares issued to OPTION HOLDER hereunder, and OPTION HOLDER
   Shares, if any, delivered to OPTION GRANTOR at a Closing, shall include a
   legend in substantially the following form:

        THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
        REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR ANY STATE
        SECURITIES OR BLUE SKY LAWS, AND MAY BE REOFFERED OR SOLD ONLY IF SO
        REGISTERED OR IF AN EXEMPTION FROM SUCH REGISTRATION IS AVAILABLE. 
        SUCH SECURITIES ARE ALSO SUBJECT TO ADDITIONAL RESTRICTIONS ON
        TRANSFER AS SET FORTH IN THE OPTION HOLDER STOCK OPTION AND TRIGGER
        PAYMENT AGREEMENT, DATED AS OF NOVEMBER 10, 1995, A COPY OF WHICH MAY
        BE OBTAINED FROM THE ISSUER UPON REQUEST.

   It is understood and agreed that:

                  (i)  the reference to the resale restrictions of the
        Securities Act and state securities or Blue Sky laws in the above
        legend shall be removed by delivery of substitute certificate(s)
        without such reference if OPTION HOLDER or OPTION GRANTOR, as the
        case may be, shall have delivered to the other party a copy of a
        letter from the staff of the SEC, or an opinion of counsel, in form
        and substance satisfactory to the other party, to the effect that
        such legend is not required for purposes of the Securities Act or
        such laws;

                  (ii)  the reference to the provisions to this Agreement in
        the above legend shall be removed by delivery of substitute
        certificate(s) without such reference if the shares have been sold or
        transferred in compliance with the provisions of this Agreement and
        under circumstances that do not require the retention of such
        reference; and

                  (iii)  the legend shall be removed in its entirety if the
        conditions in the preceding clauses (i) and (ii) are both satisfied.

   In addition, such certificates shall bear any other legend as may be
   required by law.  Certificates representing shares sold in a registered
   public offering pursuant to Section 11 shall not be required to bear the
   legend set forth in this Section 13.

             14.  BINDING EFFECT; NO ASSIGNMENT; NO THIRD PARTY
   BENEFICIARIES.  (a)  This Agreement shall be binding upon and inure to the
   benefit of the parties hereto and their respective successors and
   permitted assigns.

             (b)  Except as expressly provided for in this Agreement, neither
   this Agreement nor the rights or obligations of either party hereto are
   assignable, except by operation of law, or with the written consent of the
   other party.

             (c)  Nothing contained in this Agreement, express or implied, is
   intended to confer upon any person other than the parties hereto and their
   respective permitted assigns any rights or remedies of any nature
   whatsoever by reason of this Agreement.

             (d)  Any Restricted Shares sold by a party in compliance with
   the provisions of Section 11 shall, upon consummation of such sale, be
   free of the restrictions imposed with respect to such shares by this
   Agreement, unless and until such party shall repurchase or otherwise
   become the beneficial owner of such shares, and any transferee of such
   shares shall not be entitled to the registration rights of such party.

             15.  SPECIFIC PERFORMANCE.  The parties hereto agree that
   irreparable harm would occur in the event that any of the provisions of
   this Agreement were not performed in accordance with their specified terms
   or were otherwise breached.  It is accordingly agreed that the parties
   hereto shall be entitled to an injunction or injunctions to prevent
   breaches of this Agreement and to enforce specifically the terms and
   provisions hereof in any court of the United States or any state having
   jurisdiction, this being in addition to any other remedy to which they are
   entitled at law or equity.

             16.  VALIDITY.  (a)  The invalidity or unenforceability of any
   provision of this Agreement shall not affect the validity or
   enforceability of the other provisions of this Agreement, which shall
   remain in full force and effect.

             (b)  In the event any court or other competent authority holds
   any provisions of this Agreement to be null, void or unenforceable, the
   parties hereto shall negotiate in good faith the execution and delivery of
   an amendment to this Agreement in order, as nearly as possible, to
   effectuate, to the extent permitted by law, the intent of the parties
   hereto with respect to such provision and the economic effects thereof.

             (c)  Subject to Section 5, if for any reason any such court or
   regulatory agency determines that OPTION HOLDER is not permitted to
   acquire, or OPTION GRANTOR is not permitted to repurchase pursuant to
   Section 8, the full number of shares of OPTION GRANTOR Common Stock
   provided in Section 1 hereof (as the same may be adjusted), it is the
   express intention of OPTION GRANTOR to allow OPTION HOLDER to acquire or
   to require OPTION GRANTOR to repurchase such lesser number of shares as
   may be permissible without any amendment or modification hereof.

             (d)  Each party agrees that, should any court or other competent
   authority hold any provision of this Agreement or part hereof to be null,
   void or unenforceable, or order any party to take any action inconsistent
   herewith, or not take any action required herein, the other party shall
   not be entitled to specific performance of such provision or part hereof
   or to any other remedy, including but not limited to money damages, for
   breach hereof or of any other provision of this Agreement or part hereof
   as the result of such holding or order.

             17.  NOTICES.  All notices and other communications hereunder
   shall be in writing and shall be deemed given if (a) delivered personally,
   or (b) if sent by overnight courier service (receipt confirmed in
   writing), or (c) if delivered by facsimile transmission (with receipt
   confirmed), or (d) five days after being mailed by registered or certified
   mail (return receipt requested) to the parties in each case to the
   following addresses (or at such other address for a party as shall be
   specified by like notice):

             A.   If to OPTION HOLDER, to:

                  Interstate Power Company
                  1000 Main Street
                  Dubuque, Iowa  52004-0789

                  Attention:  Wayne H. Stoppelmoor
                              Chairman
                  Fax:  (319) 557-2202

                  with a copy to:

                  Milbank, Tweed, Hadley & McCloy
                  1 Chase Manhattan Plaza
                  New York, New York  10005-1413

                  Attention:  John T. O'Connor, Esq. 
                  Fax:  (212) 530-5219

             B.   If to OPTION GRANTOR, to:

                  IES Industries Inc.
                  IES Tower 
                  200 First Street, S.E.
                  Cedar Rapids, Iowa 52401

                  Attention:  Lee Liu
                  Fax:  (319) 398-4204

                  with a copy to:

                  Winthrop, Stimson, Putnam & Roberts
                  One Battery Park Plaza
                  New York, New York  10004-1490

                  Attention:  Stephen R. Rusmisel, Esq.
                  Fax:  (212) 858-1500

             18.  GOVERNING LAW.  This Agreement shall be governed by and
   construed in accordance with the laws of the State of Delaware applicable
   to agreements made and to be performed entirely within such State and
   without regard to its choice of law principles or to any requirement as to
   jurisdiction or service of process contained in Section 2708 of Title 6 of
   the Delaware Code.

             19.  INTERPRETATION.

             (a)  When reference is made in this Agreement to Articles,
   Sections or Exhibits, such reference shall be to an Article, Section or
   Exhibit of this Agreement, as the case may be, unless otherwise indicated.

             (b)  The table of contents and headings contained in this
   Agreement are for reference purposes and shall not affect in any way the
   meaning or interpretation of the Agreement.

             (c)  Whenever the words "include," "includes," or "including"
   are used in this Agreement, they shall be deemed to be followed by the
   words "without limitation."

             (d)  Whenever "or" is used in this Agreement it shall be
   construed in the nonexclusive sense.

             20.  COUNTERPARTS; EFFECT.  This Agreement may be executed in
   one or more counterparts, each of which shall be deemed to be an original,
   but all of which shall constitute one and the same agreement.

             21.  AMENDMENTS; WAIVER.  This Agreement may be amended by the
   parties hereto and the terms and conditions hereof may be waived only by
   an instrument in writing signed on behalf of each of the parties hereto,
   or, in the case of a waiver, by an instrument signed on behalf of the
   party waiving compliance.

             22.  EXTENSION OF TIME PERIODS.  The time periods for exercises
   of certain rights under Sections 2, 7 and 8 shall be extended (but in no
   event by more than six months):

             (a)  to the extent necessary to obtain all regulatory approvals
   for the exercise of such rights, and for the expiration of all statutory
   waiting periods; and

             (b)  to the extent necessary to avoid any liability under
   Section 16(b) of the Exchange Act by reason of such exercise.



                       THIS SPACE INTENTIONALLY LEFT BLANK


             IN WITNESS WHEREOF, the parties hereto have caused this
   Agreement to be executed by their respective duly authorized officers as
   of the date first above written.

                                 IES INDUSTRIES INC.


                                 By: /s/ Lee Liu           
                                    Name:  Lee Liu
                                    Title: Chairman of the Board, President
                                           and Chief Executive Officer


                                 INTERSTATE POWER COMPANY


                                 By: /s/ Wayne H. Stoppelmoor      
                                    Name:  Wayne H. Stoppelmoor
                                    Title: Chairman of the Board, President
                                           and Chief Executive Officer