EXHIBIT 2.2


                     STOCK OPTION AGREEMENT
 
     This STOCK OPTION AGREEMENT, dated as of April 13, 1996, (the
 "Agreement") by and between Texas Utilities Company, a corporation formed
 under the laws of the State of Texas ("TUC"), and ENSERCH Corporation, a
 corporation formed under the laws of the State of Texas ("Enserch").
 
 
                 W I T N E S S E T H   T H A T:
 
     WHEREAS, concurrently with the execution and delivery of this Agreement,
 Enserch,  TUC, TXA, Inc., a wholly-owned subsidiary of TUC, and TXB, Inc., a
 corporation formed under the laws of the State of Texas, entered into an
 Agreement and Plan of Merger, dated as of April  13, 1996, (the "Merger
 Agreement"), which provides, inter alia, upon the terms and subject to the
 conditions thereof, for the merger of TXA, Inc. with and into Enserch or, in
 certain circumstances, the merger of two newly formed, wholly-owned
 subsidiaries of TXB, Inc. with and into TUC and Enserch respectively (in
 either case, the "Merger").
 
     WHEREAS, as a condition to TUC's willingness to enter into the Merger
 Agreement, TUC has requested that Enserch agree, and Enserch has so agreed,
 to grant to TUC an option with respect to certain shares of Enserch' common
 stock, on the terms and subject to the conditions set forth herein;
     
     NOW THEREFORE, to induce TUC to enter into the Merger Agreement, and in
 consideration of the representations, warranties, covenants and agreements
 contained herein, in the Merger Agreement, 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 applicable law, Enserch hereby grants TUC an irrevocable option
 (the "Enserch Option") to purchase up to 3,363,570 shares, subject to
 adjustment as provided in Section 11 (the "Enserch Shares"), of common stock,
 par value $4.45 per share, of Enserch (the "Enserch Common Stock") (being 4.9%
 of the number of shares of Enserch Common Stock outstanding as of March 31,
 1996) in the manner set forth below, at a price (the "Exercise Price") per
 Enserch Share of $16 3/8.
 
     (b)  The Exercise Price shall be payable, at TUC's option, as follows:
 
          (i)  in cash, or
 
          (ii) subject to the receipt of all approvals of any Governmental
      Authority required for Enserch to acquire, and TUC to issue, TUC Shares
      (as defined below) from TUC, in shares of common stock, without par
      value, of TUC ("TUC Shares"))
 
 in either case in accordance with Section 4 hereof.
 
     (c)  Notwithstanding the foregoing, in no event shall the number of
 Enserch Shares for which the Enserch Option is exercisable exceed 4.9% of the
 number of issued and outstanding shares of Enserch Common Stock.
 
     (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)  Capitalized terms used herein but not defined herein shall have
 the meanings set forth in the Merger Agreement.
 
     2.   Exercise of Option.
 
     (a)  The Enserch Option may be exercised by TUC, in whole or in part,
 at any time or from time to time after the Merger Agreement becomes terminable
 by TUC under circumstances which could entitle TUC to a payment under 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 TUC being referred to herein as a "Trigger Event").
 
     (b)(i)    Enserch shall notify TUC promptly in writing of the
 occurrence of any Trigger Event, it being understood that the giving of such
 notice by Enserch shall not be a condition to the right of TUC to exercise the
 Enserch Option.
 
          (ii) In the event TUC wishes to exercise the Enserch Option, TUC
      shall deliver to Enserch written notice (an "Exercise Notice")
      specifying the total number of Enserch Shares it wishes to purchase.
 
          (iii)     Upon the giving by TUC to Enserch of the Exercise Notice and
      the tender of the applicable aggregate Exercise Price, TUC, to the
      extent permitted by law and Enserch's organizational documents, and
      provided that the conditions to Enserch's obligations to issue the
      Enserch Shares to TUC hereunder set forth in Section 3 have been
      satisfied or waived, shall be deemed to be the holder of record of the
      Enserch Shares issuable upon such exercise, notwithstanding that the
      stock transfer book of Enserch shall then be closed or that certificates
      representing such Enserch Shares shall not then be actually delivered
      to TUC.
 
          (iv) Each closing of a purchase of Enserch Shares (a "Closing")
      shall occur at a place, on a date, and at a time designated by TUC in
      an Exercise Notice delivered at least two business days prior to the
      date of the Closing.
 
     (c)  The Enserch 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 could entitle TUC to
      a payment under Section 10.3(b) of the Merger Agreement; and
 
          (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 Enserch 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 September 30, 1997.
 
     (d)  Notwithstanding the foregoing, the Enserch Option may not be
 exercised if TUC is in 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.
 
     3.   Conditions to Closing.  The obligation of Enserch to issue the
 Enserch Shares to TUC hereunder is subject to the conditions that
 
     (a)  all waiting periods, if any, under the HSR Act applicable to the
 issuance of the Enserch Shares hereunder shall have expired or have been
 terminated;
 
     (b)  the Enserch Shares, and any TUC Shares which are issued in payment
 of the Exercise Price, shall have been approved for listing on the NYSE upon
 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 and
 acquisition of the Enserch Shares hereunder shall have been obtained or made,
 including, without limitation, any required approval of the SEC under Sections
 9 and 10 of the 1935 Act, any required approval of the Texas Railroad
 Commission or the Texas Public Utilities Commission, as the case may be, of
 (i) the issuance of the Enserch Shares by Enserch (ii) the acquisition of
 Enserch Shares by TUC and (iii) the acquisition by Enserch of the TUC 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 conditions set forth in paragraph (b) above may be waived by Enserch, in
 the case of TUC Shares, and by TUC, in the case of Enserch Shares, in the sole
 discretion of the waiving party.
 
     4.   Closing. At any Closing, 
 
     (a)  Enserch shall deliver to TUC or its designee a single certificate
 in definitive form representing the number of Enserch Shares designated by TUC
 in its Exercise Notice, such certificate to be registered in the name of TUC
 and to bear the legend set forth in Section 12; and
 
     (b)  TUC shall deliver to Enserch the aggregate price for the Enserch
 Shares so designated and being purchase by
 
          (i)  wire transfer of immediately available funds or certified
      check or bank check, or
 
          (ii) subject to the conditions in Section 1(b)(ii), a certificate
      or certificates representing the number of TUC Shares being issued by
      TUC in consideration thereof, determined in accordance with Section
      4(c).
 
     (c)  In the event that TUC issues TUC Shares to Enserch in
 consideration of Enserch Shares pursuant to Section 4(b)(ii), the number of
 TUC Shares to be so issued shall be equal to the quotient obtained by
 dividing:
 
          (i)  the product of (x) the number of Enserch Shares with respect
      to which the Enserch Option is being exercised and (y) the Exercise
      Price, by
 
          (ii) the Fair Market Value of the TUC Shares as of the date
      immediately preceding the date the Exercise Notice is delivered to
      Enserch.
 
     (d)  Enserch shall pay all expenses, and any and all United States
 Federal, state and local taxes, and other chargers that may be payable in
 connection with the preparation, issue and delivery of stock certificates
 under this Section 4.
 
     5.   Representations and Warranties of Enserch. Enserch represents and
 warrants to TUC that
 
     (a)  Subject to any required regulatory approvals, Enserch 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
 Enserch Shares pursuant to Section 7(a) to applicable law and the provisions
 of Enserch' Articles of Incorporation, as amended (the "Enserch Articles");
 
     (b)  this Agreement has been duly and validly executed and delivered
 by Enserch, and assuming the due authorization, execution and delivery hereby
 by TUC, constitutes a valid and binding obligation of Enserch, enforceable
 against Enserch in accordance with its terms, except as may be limited by
 applicable bankruptcy, insolvency, fraudulent conveyance, 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)  Enserch has taken all necessary corporate action to authorize and
 reserve for issuance and to permit it to issue, upon exercise of the Enserch
 Option, and at all times from the date hereof through the expiration of the
 Enserch Option will have reserved 3,363,570 authorized and unissued Enserch
 Shares, such amount being subject to adjustment as provided in Section 11, all
 of which, upon their issuance and delivery in accordance with the terms of
 this Agreement, will be validly issued, fully paid and nonassessable;
 
     (d)  upon delivery of the Enserch Shares to TUC upon the exercise of
 the Enserch Option, TUC will acquire the Enserch 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 Enserch Disclosure
 Schedule to the Merger Agreement, the execution and delivery of this Agreement
 by Enserch does not, and, subject to compliance with applicable law and the
 Enserch Articles with respect to the repurchase of the Enserch Shares pursuant
 to Section 7(a), the consummation by Enserch 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 or
 acceleration, loss or creation, hereinafter a "Violation") of Enserch or any
 of its Subsidiaries, pursuant to
 
          (i)  any provision of the Enserch Articles or the Bylaws of
      Enserch,
 
          (ii) any provision of any material loan or credit agreement,
      note, mortgage, indenture, lease, Enserch benefit plan or other
      agreement, obligation, instrument, permit, concession, franchise,
      license of Enserch or its Subsidiaries or to which any of them is a
      party (any of the foregoing in effect on the date hereof being referred
      to as a "Material Contract"), or
 
          (iii)     any judgment, order, decree, statute, law, ordinance, rule
      or regulation applicable to Enserch or its properties or assets,
 
 which Violation, in the case of each of clauses (ii) and (iii), could
 reasonably be expected to have a Enserch Material Adverse Effect (except that
 no representation or warranty is given concerning any Violation of a Material
 Contract with respect to the repurchase of Enserch Shares pursuant to Section
 7(a));
 
     (f) except as described in Section 5.4(c) of the Enserch Disclosure
 Schedule to the Merger Agreement or Section 3 hereof, the execution and
 delivery of this Agreement by Enserch does not, and the performance of this
 Agreement by Enserch will not, require any consent, approval, authorization
 or permit or filing with or notification to, any Governmental Authority;
 
     (g)  none of Enserch, any of its affiliates or anyone acting on its or
 their behalf, has issued, sold or offered any security of Enserch to any
 person under circumstances that would cause the issuance and sale of Enserch
 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 TUC contained in Section 6(g)
 are true and correct, the issuance, sale and delivery of the Enserch Shares
 hereunder would be exempt from the registration and prospectus delivery
 requirements of the Securities Act, as in effect on the date hereof  (and
 Enserch shall not take any action which would cause the issuance, sale, and
 delivery of Enserch Shares hereunder not to be exempt from such requirements);
 and
     
     (h)  any TUC Shares acquired pursuant to this Agreement will be
 acquired for Enserch' own account, for investment purposes only, and will not
 be acquired by Enserch with a view to the public distribution thereof in
 violation of nay applicable provision of the Securities Act.
 
     6.   Representations and Warranties of TUC. TUC represents and warrants
 to Enserch that 
 
     (a)  TUC 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 TUC, and assuming the due authorization, execution and delivery hereof,
 constitutes a valid and binding obligation of TUC, enforceable against TUC 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 may be brought:
 
     (c)  prior to any delivery of TUC Shares in consideration of the
 purchase of Enserch Shares pursuant hereto, TUC will have taken all necessary
 corporate action to authorize for issuance and to permit it to issue such TUC
 Shares, all of which, upon their issuance and delivery in accordance with the
 terms of this Agreement, will be validly issued, fully paid and nonassessable;
 
     (d)  upon any delivery of such TUC Shares to Enserch in consideration
 of the purchase of Enserch Shares pursuant hereto, Enserch will acquire the
 TUC Shares free and clear of all claims, liens, charges, encumbrances and
 security interest of any nature whatsoever;
 
     (e)  except as described in Section 6.4(b) of the TUC Disclosure
 Schedule to the Merger Agreement, the execution and delivery of this Agreement
 by TUC does not, and the consummation by TUC 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 TUC or any of its
 subsidiaries, pursuant to
 
          (i)  any provision of the Articles of Incorporation or Bylaws of
      TUC,
 
          (ii) any provisions of any loan or credit agreement, note,
      mortgage, indenture, lease, TUC benefit plan or other agreement,
      obligation, instrument, permit, concession, franchise, license of TUC
      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 TUC or its properties or assets,
 
 which Violation, in the case of each of clauses (ii) or (iii) would have a TUC
 Material Adverse Effect;
 
     (f)  except as described in Section 6.4(c) of the TUC Disclosure
 Schedule to the Merger Agreement or Section 3 hereof, the execution and
 delivery of this Agreement by TUC does not, and the consummation by TUC of the
 transactions contemplated hereby will not, require any consent, approvals
 authorization or permit of, or filing with or notification to, any
 Governmental Authority; and
 
     (g)  any Enserch Shares acquired upon exercise of the Enserch Option
 will be acquired for TUC's own account, for investment purposes only and will
 not be, and the Enserch Option is not being, acquired by TUC with a view to
 the public distribution thereof, in violation of any applicable provision of
 the Securities Act.
 
     7.   Certain Repurchases.
 
     (a)  TUC "Put".     At the request of TUC by written notice (x) at any
 time during which the Enserch Option is exercisable pursuant to Section 2 (the
 "Repurchase Period"), Enserch (or any successor entity thereof) shall, if
 permitted by applicable law, the Enserch Articles and Bylaws and Enserch's
 Material Contracts (but notwithstanding any insufficiency in the number of
 Enserch Shares authorized for issuance upon the exercise of the Enserch
 Option), repurchase from TUC all or any portion of the Enserch Option, at the
 price set forth in subparagraph (i) below, or, (y) at any time prior to March
 31, 1997 (provided that such date shall have extended to September 30, 1997
 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 September 30, 1997), Enserch (or any successor entity
 thereof) shall, if permitted by applicable law, the Enserch Articles and
 Enserch's Material Contracts, repurchase from TUC all or any portion of the
 Enserch Shares purchased by TUC pursuant to the Enserch Option, at the price
 set forth in subparagraph (ii) below:
 
          (i)  the difference between the "Market/Offer Price" (as defined
      below) for shares of Enserch Common Stock as of the date TUC gives
      notice of its intent to exercise its rights under this Section 7 and the
      Exercise Price, multiplied by the number of Enserch Shares purchasable
      pursuant to the Enserch Option (or portion thereof with respect to which
      TUC is exercising its rights under this Section 7), but only if the
      Market/Offer Price is greater than the Exercise Price. For purposes of
      this subparagraph (i), "Market/Offer Price" shall mean, as of any date,
      the higher of (x) 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 Enserch as the Target Party which was
      made prior to such date and not terminated or withdrawn as of such date
      and (y) the Fair Market Value of Enserch Common Stock as of such date.
 
          (ii) the product of (x) the sum of (A) the Exercise Price paid
      by TUC per Enserch Share acquired pursuant to the Enserch Option, and
      (B) the difference between the "Offer Price" (as defined below) and the
      Exercise Price, but only if the Offer Price is greater than the Exercise
      Price, and (y) the number of Enserch Shares so to be repurchased
      pursuant to this Section 8. 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 Enserch
      as the Target party during the Repurchase Period prior to the delivery
      by TUC of a notice of repurchase.
 
     (b)  Redelivery of TUC Shares. If TUC shall have previously elected to
 purchase Enserch Shares pursuant to the exercise of the Enserch Option by the
 issuance and delivery of TUC Shares, then Enserch shall, if so requested by
 TUC, in fulfillment of its obligation pursuant to Section 7(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
 7(a)(ii)(x)), redeliver the certificates for such TUC Shares to TUC, 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
 Enserch Shares so purchased by TUC pursuant to the Enserch Option are to be
 repurchased by Enserch pursuant to Section 7(a)(y), then (i) Enserch shall be
 obligated to redeliver to TUC the same proportion of such TUC Shares as the
 number of Enserch Shares that Enserch is then obligated to repurchase bears
 to the number of Enserch Shares acquired by TUC upon exercise of the Enserch
 Option and (ii) TUC shall issue to Enserch new certificates representing those
 TUC Shares which are not due to be redelivered to TUC pursuant to this Section
 7(b) to the extent that excess TUC Shares are included in the certificates
 redelivered to TUC by Enserch.
 
     (c)  Payment and Redelivery of Enserch Options or Shares. In the event
 TUC exercises its rights under this Section 7, Enserch shall, within ten
 business days thereafter, pay the required amount to TUC in immediately
 available funds and TUC shall surrender to Enserch the Enserch Option or the
 certificate or certificates evidencing the Enserch Shares purchased by TUC
 pursuant hereto, and TUC shall warrant that it owns the Enserch Option or such
 shares and that the Enserch Option or such shares are then free and clear of
 all liens, claims, damages, charges and encumbrances of any kind or nature
 whatsoever.
 
     (d)  TUC "Call". If TUC has elected to purchase Enserch Shares pursuant
 to the exercise of the Enserch Option by the issuance and delivery of TUC
 Shares, notwithstanding that TUC may no longer hold any such Enserch Shares
 or that TUC elects not to exercise its other rights under this Section 7, TUC
 may require, at any time or from time to time prior to March 31, 1997
 (provided that such date shall be extended to September 30, 1997 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 September 30, 1997), Enserch to sell to TUC any such TUC Shares
 at the price attributed to such TUC 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 TUC Shares pursuant to Section 4 to the Closing Date
 under this Section 7(d) less any dividends on such TUC Shares paid during such
 period or declared and payable to shareholders of record on a date during such
 period.
 
     (e)  Repurchase Price Reduced at TUC's Option. In the event the
 repurchase price specified in Section 7(a) would subject the purchase of the
 Enserch Option or the Enserch Shares purchased by TUC pursuant to the Enserch
 Option to a vote of the shareholders of Enserch pursuant to applicable law or
 the Enserch Articles, then TUC may, at its election, reduce the repurchase
 price to an amount which would permit such repurchase without the necessity
 for such a shareholder vote.
 
     8.   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 TUC 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.
 
     9.   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 7, or
 (ii) in accordance with Section 7(b) or Section 10.
 
     (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.
 
     10.  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 commerce 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 10 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 10 to be qualified
 for sale under the securities or Blue Sky law 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 10 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 10 shall be effected
 at the Registrant's expense, except for underwriting discounts and commissions
 and the fees and these 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
 10, 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 10 only if and to the extent the Manager determines that such
 inclusion will not adversely affect the prospects for success of such
 offering.
 
     11.  Adjustment of Number of Enserch Shares.
 
     (a)  Without limitation to any restrictions on Enserch contained in
 this Agreement or in the Merger Agreement, in the event of any change in
 Enserch 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 Enserch
 Option, and the purchase price per share provided in Section 1, shall be
 adjusted appropriately to restore to TUC its rights hereunder, including the
 right to purchase from Enserch (or its successors) shares of Enserch Common
 Stock (or such other shares or securities into which Enserch Common Stock has
 been so changed) representing 4.9% of the outstanding Enserch Common Stock for
 the aggregate Exercise Price calculated as of the date of this Agreement as
 provided in Section 1.
 
     (b)  If, as a result of the application of the limitations on payments
 contained in Section 10.3(d) of the Merger Agreement, the maximum payment upon
 the "put" of the entire Enserch Option under Section 7(a) of this Agreement
 is limited, the number of Enserch Shares shall be reduced to the maximum
 number of Enserch Shares that would, if the "put" of the Enserch Option 
 provided in Section 7(a) of this Agreement were exercised on the Termination
 Date (as defined in the Merger Agreement), result in such maximum payment as
 so limited.
     12.  Restrictive Legends. Each certificate representing shares of
 Enserch Common Stock issued to TUC hereunder, and TUC Shares, if any,
 delivered to Enserch 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, AN D 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 ENSERCH STOCK OPTION
      AGREEMENT, DATED AS OF APRIL 13, 1996, 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 TUC or Enserch, 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 should in a registered public
 offering pursuant to Section 10 shall not be required to bear the legend set
 forth in this Section 12.
 
     13.  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 Assignment.
 
     (d)  Any Restricted Shares sold by a party in compliance with the
 provision of Section 10 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 to be entitled to the
 registration rights of such party.
 
     14.  Specific Performance.     The parties hereto agree that irreparable
 harm would occur in the event that any of the provision 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
 Untied States or any state having jurisdiction, this being in addition to any
 other remedy to which they are entitled at law or equity.
 
     15.  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
 provision 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)  If for any reason any such court or regulatory agency determines
 that TUC is not permitted to acquire, or Enserch is not permitted to
 repurchase pursuant to Section 8, the full number of shares of Enserch Common
 Stock provided in Section 1 hereof (as the same may be adjusted), it is the
 express intention of Enserch to allow TUC to acquire or to require Enserch 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
 therewith, or not take any action required herein, the other party shall not
 be entitled to specific performance of such provisions 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.
 
     16.  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 TUC to:
 
          By Mail:  
          and Hand:      Worsham, Forsythe & Wooldridge, L.L.P.
                         1601 Bryan Street, 30th Floor
                         Dallas, Texas  75201
                         Attention:  Robert A. Wooldridge, Esq.
 
 
         with a copy to: LeBoeuf, Lamb, Greene & MacRae, L.L.P.
                         125 West 55th Street
                         New York, N.Y.  10019
                         Attention:  Douglas W. Hawes, Esq.
 
     B.   If to Enserch to:
 
          By Mail:  
          and Hand:      Enserch Corporation
                         300 South St. Paul
                         Dallas, Texas 
                         Attention:  William T. Satterwhite, Esq.
 
 
         with a copy to: Covington & Burling
                         1201 Pennsylvania Avenue, N.W.
                         Washington, D.C.  20044
                         Attention:  David Brown, Esq.
 
     17.  Governing Law; Choice of Forum. This Agreement shall be governed
 by and construed in accordance with the laws of the State of Texas applicable
 to agreements made and to be performed entirely within such State and without
 regard to its choice of law principles.
 
      18.  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 heading 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.
 
     19.  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.
 
     20.  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.
 
     21.  Extension of Time Periods. The time periods for exercise of
 certain rights under Sections 2, 6 and 7 shall be extended:
 
     (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.





     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
          
                              ENSERCH CORPORATION
 
 
 
                              By:  /s/ D. W. Biegler
                                   ---------------------------------
                                    Name:
                                    Title:
 
 
                              TEXAS UTILITIES COMPANY
 
 
 
                              By:  /s/ Erle Nye
                                   ---------------------------------
                                    Name:
                                    Title: