Document:

<PAGE>   1

                                                                     EXHIBIT 4.1

                      WOODWIND COMMUNICATION SYSTEMS, INC.

                             1999 STOCK OPTION PLAN

     1.   PURPOSE. This 1999 Stock Option Plan (hereinafter referred to as this
"Plan") is intended to promote the best interests of the Corporation and its
stockholders by (a) enabling the Corporation and any Parent or Subsidiary to
attract and retain persons of ability as employees, directors, consultants and
advisers, (b) providing an incentive to such persons by affording them an equity
participation in the Corporation and (c) rewarding those employees, directors,
consultants and advisers who contribute to the operating progress and earning
power of the Corporation or any Parent or Subsidiary.

     2.   Definitions. The following terms shall have the following meanings
when used herein unless the context clearly otherwise requires:

          A.   "BOARD OF DIRECTORS" means the Board of Directors of the
Corporation.

          B.   "CODE" means the Internal Revenue Code of 1986, as amended, or
any successor provisions.

          C.   "COMMON STOCK" means the Common Stock of the Corporation, par
value One Cent ($0.01) per share.

          D.   "CONTROLLING PARTICIPANT" means any Eligible Person who,
immediately before any Option is granted to that particular Eligible Person,
directly or indirectly possesses more than ten percent (10%) of the total
combined voting power of all classes of stock of the Corporation (or any Parent
or Subsidiary).

          E.   "COMMITTEE" means any committee to which the Board of Directors
delegates any responsibility for the implementation, interpretation or
administration of this Plan.

          F.   "CORPORATION" means Woodwind Communications Systems, Inc., a
Delaware corporation.

          G.   "ELIGIBLE PERSON" means any employee or director of, or
consultant or adviser to, the Corporation or any Parent or Subsidiary.

          H.   "EXERCISE PRICE" means the price at which a share of Incentive
Stock may be purchased by a particular Participant pursuant to the exercise of
an Option.

          I.   "FAIR MARKET VALUE" means the value of a share of Incentive Stock
as determined by the Board of Directors in a manner that the Board of Directors
believes to be in accordance with the Code.

          J.   "INCENTIVE STOCK" means shares of Common Stock issued pursuant to
this Plan.

                                      -1-

<PAGE>   2

          K.   "ISO" means an Option (or a portion thereof) intended to qualify
as an "incentive stock option" within the meaning of Section 422 of the Code, or
any successor provision.

          L.   "NQSO" means an Option (or a portion thereof) which is not
intended to, or does not, qualify for any reason as an "incentive stock option"
within the meaning of Section 422 of the Code, or any successor provision.

          M.   "OPTION" means the right of a Participant to purchase shares of
Incentive Stock in accordance with the terms of this Plan and the Stock Option
Agreement between such Participant and the Corporation.

          N.   "PARENT" means any corporation (other than the Corporation) in an
unbroken chain of corporations ending with the Corporation if, at the time of
granting of an Option, each of the corporations (other than the Corporation)
owns stock possessing at least fifty percent (50%) of the total combined voting
power of all classes of stock in one of the other corporations in such chain.

          O.   "PARTICIPANT" means any Eligible Person to whom an Option has
been granted pursuant to this Plan and who is a party to a Stock Option
Agreement.

          P.   "SAR" means the right of a Participant to receive cash or other
consideration equal to the difference between the Fair Market Value of the
Incentive Stock covered by all or any unexercised portion of an Option on the
date of exercise of the SAR and the Fair Market Value of such Incentive Stock on
the date of grant of the SAR.

          Q.   "STOCK OPTION AGREEMENT" means an agreement by and between a
Participant and the Corporation setting forth the specific terms and conditions
of an Option and/or SAR, which shall establish the specific terms and conditions
under which Incentive Stock may be purchased by such Participant pursuant to the
exercise of such Option. Such Stock Option Agreement shall be subject to the
provisions of this Plan (which shall be incorporated by reference therein) and
shall contain such provisions as the Board of Directors, in its sole discretion,
may authorize.

          R.   "SUBSIDIARY" means any corporation (other than the Corporation)
in an unbroken chain of corporations beginning with the Corporation if, at the
time of granting of an Option, each of the corporations (other than the last
corporation in the unbroken chain) owns stock possessing at least fifty percent
(50%) of the total combined voting power of all classes of stock in one of the
other corporations in such chain.

     3.   Adoption and Administration of Plan.

          A.   Plan Approval. This Plan shall become effective upon its adoption
by the Board of Directors; provided, however, that if the stockholders of the
Corporation shall not approve this Plan, in accordance with applicable state
law, within twelve (12) months before or alter the adoption of this Plan by the
Board of Directors, this Plan shall expire by its terms. No Option, SAR or other
award hereunder shall be exercisable or payable in any respect prior to such
approval of this Plan by the stockholders of the Corporation.

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          B.   Grant of Options. Any Option granted pursuant to this Plan shall
be granted within ten (10) years from the date that this Plan is adopted by the
Board of Directors or the date that this Plan is approved by the stockholders of
the Corporation, whichever is earlier.

          C.   Board of Directors' Authority. The Board of Directors shall
implement, interpret (except as expressly provided in this Plan) and administer
this Plan. Without limiting the powers and authority of the Board of Directors
in any respect, the Board of Directors shall have authority (i) to construe and
interpret this Plan and any Stock Option Agreement entered into hereunder; (ii)
to determine the Fair Market Value of Incentive Stock; (iii) to select Eligible
Persons to whom Options may from time to time be granted hereunder; (iv) to
determine whether any Option or any portion thereof shall be an ISO or a NQSO;
(v) to determine the number of shares of Incentive Stock to be covered by any
Option and the Exercise Price applicable to any Option; (vi) to determine the
terms and conditions, not inconsistent with the terms of this Plan, of any
Option and to approve forms of Stock Option Agreement; (vii) to determine
whether, and under what circumstances, an Option may be settled or paid in cash
or other consideration; (viii) to amend, cancel, accept the surrender of, modify
or accelerate the vesting of all or any portion of an Option, including
amendments or modifications that may cause an ISO to become a NQSO; (ix) to
authorize and implement any amendment, as required by the Code or with the
consent of the Participant, to any Stock Option Agreement and the terms of any
Option evidenced thereby; and (x) to establish policies and procedures for the
exercise of Options and the satisfaction of withholding or other obligations
arising in connection therewith.

          D.   Delegation of Authority. To the extent not prohibited by the
General Corporation Law of the State of Delaware or the charter or bylaws of the
Corporation, the Board of Directors may delegate any or all of its
responsibilities hereunder to the Committee, and all references herein or in any
Stock Option Agreement to the Board of Directors shall, to the extent
applicable, be deemed to refer to and include the Committee.

          E.   Action by Board of Directors. Any action taken by the Board of
Directors (or the Committee) with respect to the implementation, interpretation
or administration of this Plan shall be final, conclusive and binding.

     4.   TOTAL NUMBER OF SHARES OF INCENTIVE STOCK. The number of shares of
Incentive Stock which (a) may be issued in the aggregate by the Corporation
under this Plan pursuant to the exercise of Options granted hereunder and (b)
may be covered by SARs granted hereunder which have not expired unexercised
shall not be more than four million six hundred seventy-five thousand three
hundred sixty-one (4,675,361) which number may be increased only by a resolution
adopted by the Board of Directors and approved within twelve (12) months after
such adoption by the stockholders of the Corporation in accordance with
applicable state law. Such shares of Incentive Stock may be issued out of the
authorized and unissued or reacquired Common Stock of the Corporation. Any
shares subject to an Option, SAR or portion thereof which expires or is
terminated unexercised (unless by virtue of the exercise of an Option or SAR
granted in tandem therewith) as to such shares may again be subject to an Option
or SAR under this Plan. To the extent there shall be any adjustment pursuant to
the provisions of Article 9 hereof, the aforesaid number of shares shall be
appropriately so adjusted.

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     5.   ELIGIBILITY AND AWARD.

          A.   Terms and Conditions of Options. The Board of Directors shall
determine, at any time and from time to time, (i) any Eligible Person to whom
the award of an Option or SAR may further the purposes of this Plan in the view
of the Board of Directors, (ii) whether any Option to be awarded to an Eligible
Person shall be intended as an ISO or as a NQSO, the number of shares of
Incentive Stock to be covered by such Option or a SAR, the Exercise Price of
such Option or SAR, whether such Option contains a SAR and all other terms and
conditions of such Option, (iii) the Fair Market Value on the date of grant of
the Option or SAR and (iv) the terms and conditions of the Stock Option
Agreement to evidence such Option or SAR, including the restrictions, if any,
applicable to the shares of Incentive Stock that may be acquired upon exercise
of any portion of such Option. The Board of Directors may delegate to the
appropriate officer or officers of the Corporation the authority to prepare,
execute and deliver any Stock Option Agreement evidencing any Option or SAR
granted under this Plan; provided, however, that any such Stock Option Agreement
shall be consistent with the terms and conditions of this Plan.

          B.   Terms and Conditions of ISO. For any Option intended to qualify
as an ISO, in whole or in part, (i) the Eligible Person shall then be an
employee of the Corporation or a Parent or Subsidiary, as provided in the Code,
(ii) the term during which such Option shall be in effect shall not be greater
than ten (10) years (provided, however, that the term shall not be greater than
five (5) years for any Option granted to a Controlling Participant), (iii) the
Exercise Price shall not be less than one hundred percent (100%) of the Fair
Market Value on the date that such Option is granted (provided, however, that,
if an ISO shall be granted to a Controlling Participant, the Exercise Price
shall not be less than one hundred ten percent (110%) of the Fair Market Value
on the date that such Option is granted) and (iv) such Option is exercisable
only by the Participant during his or her lifetime and shall be nontransferable
by the Participant unless the Stock Option Agreement permits such Option to be
transferred by will or the laws of descent and distribution.

          C.   Notice of Option Grant. As soon as practicable after the Board of
Directors determines to award an Option or SAR pursuant to 5A hereof, the
appropriate officer or officers of the Corporation shall give notice (written or
oral) to such effect to each Eligible Person designated to be awarded an Option
or SAR, which notice shall be accompanied by a copy or copies of the Stock
Option Agreement to be executed by such Eligible Person.

          D.   Execution of Stock Option Agreement. Upon receipt of the notice
specified in 5C hereof, an Eligible Person shall have an Option or SAR, and
shall thereby become and be a Participant, only after the due execution and
delivery by such Eligible Person and the Corporation of a Stock Option Agreement
(in such form and number as the officer or officers of the Corporation shall
direct) by such date and time as shall be specified in such notice (unless
waived by the Corporation).

          E.   Assumption of Option. In the event that the Corporation or any
Parent or Subsidiary assumes an option granted by another entity, which option
is to be covered by this Plan and upon the exercise of which shares of Incentive
Stock are to be issued, the terms and conditions of such option shall remain
unchanged (except the exercise price and the number and

                                      -4-

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nature of shares issuable upon exercise thereof, which shall be adjusted
appropriately in accordance with the Code, and references to such other entity,
which shall be deemed to refer to the Corporation). In the event that the Board
of Directors elects to grant an Option or SAR under this Plan to replace an
option or SAR granted by another entity (rather than assume such option or SAR),
the holder of such option or SAR shall be eligible to receive such replacement
Option or SAR, which may be granted with a similarly-adjusted Exercise Price.

     6.   Exercise and Termination of Options.

          A.   Exercise of Option. An Option of a Participant may be exercised
during the period such Option is in effect and as set forth herein and in the
Stock Option Agreement, and only if compliance with all applicable Federal and
state securities laws can be effected. An Option may be exercised only by (i)
the Participant's completion, execution and delivery to the Corporation of a
notice of such Participant's exercise of such Option and an "investment letter"
(if required by the Corporation) as supplied by the Corporation and (ii) the
payment to the Corporation of the aggregate Exercise Price, in accordance with
6B hereof and the Stock Option Agreement, for the shares of Incentive Stock to
be purchased pursuant to such exercise (as shall be specified by such
Participant in such notice). Except as specifically provided by a duly executed
Stock Option Agreement or unless waived by the Board of Directors, an Option or
any of the rights thereunder may be exercised by such Participant only, and may
not be transferred or assigned, voluntarily, involuntarily or by operation of
law (including, without limitation, the laws of bankruptcy, intestacy, descent
and distribution and succession).

          B.   Payment. Payment by each Participant for the shares of Incentive
Stock purchased hereunder upon the exercise of an Option shall be made by good
check or in accordance with the terms of any Stock Option Agreement executed by
such Participant.

          C.   Repurchase Right. The Board of Directors at any time or from time
to time may offer to buy out for a payment in cash or Incentive Stock all or a
portion of an outstanding Option held by a Participant, based on such terms and
conditions as the Board of Directors shall establish and communicate to the
Participant at the time that such offer is made. The Board of Directors may
provide for the surrender of all or any portion of an Option in satisfaction of
specified obligations of a Participant, including tax withholding obligations.

          D.   Tax Obligations. As a condition to the exercise of any Option or
SAR (for non-cash consideration), the Corporation shall have the right to
require that the Participant (or the recipient of any shares of Incentive Stock
or noncash consideration) remit to the Corporation or any Parent or Subsidiary
an amount calculated by the Corporation to be sufficient to satisfy applicable
Federal, state, foreign or local withholding tax requirements prior to the
delivery of any stock certificate evidencing shares of Incentive Stock or other
form of non-cash consideration; in lieu thereof, the Participant may satisfy
applicable withholding tax requirements by electing to have the Corporation
withhold from the Incentive Stock issuable upon exercise of an Option a number
of whole shares having a fair Market Value (determined on the date that the
amount of tax to be withheld is to be fixed) at least equal to the aggregate
amount required to be withheld. Whenever any payments are to be made in cash
(upon the exercise of a SAR or otherwise), the Corporation shall be entitled, in
its sole discretion, to deduct

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<PAGE>   6

from such payment such amount calculated by the Corporation to be sufficient to
satisfy applicable Federal, state, foreign or local withholding tax requirements
thereon.

     7.   COSTS AND EXPENSES. All costs and expenses with respect to the
adoption, implementation, interpretation and administration of this Plan shall
be borne by the Corporation; provided, however, that, except as otherwise
specifically provided in this Plan or the applicable Stock Option Agreement
between the Corporation and a Participant, the Corporation shall not be
obligated to pay any costs or expenses (including legal fees) incurred by any
Participant in connection with any Stock Option Agreement, this Plan or any
Option, SAR or Incentive Stock held by any Participant.

     8.   NO PRIOR RIGHT OF AWARD. Nothing in this Plan shall be deemed to give
any director, officer or employee of, or advisor or consultant to, the
Corporation or any Parent or Subsidiary, or such person's legal representatives
or assigns, or any other person or entity claiming under or through such person,
any contract or other right to participate in the benefits of this Plan. Nothing
in this Plan shall be construed as constituting a commitment, guarantee,
agreement or understanding of any kind or nature that the Corporation or any
Parent or Subsidiary shall continue to employ, retain or engage any individual
(whether or not a Participant). This Plan shall not affect in any way the right
of the Corporation and any Parent or Subsidiary to terminate the employment or
engagement of any individual (whether or not a Participant) at any time and for
any reason whatsoever and to remove any individual (whether or not a
Participant) from any position as a director or officer. No change of a
Participant's duties as an employee of the Corporation or any Parent or
Subsidiary shall result in a modification of the terms of any rights of such
Participant under this Plan or any Stock Option Agreement executed by such
Participant.

     9.   CHANGES IN CAPITAL STRUCTURE. Subject to any required action by the
stockholders of the Corporation and the provisions of the General Corporation
Law of the State of Delaware, the number of shares of Incentive Stock
represented by the unexercised portion of an Option or SAR and the number of
shares of Incentive Stock which has been authorized or reserved for issuance
hereunder (whether such shares are unissued, reacquired or subject to an Option
or SAR that expired, was cancelled, surrendered or terminated unexercised as to
such shares), as well as the Exercise Price under the unexercised portion of an
Option or SAR, shall be proportionately adjusted for (a) a division, combination
or reclassification of any of the shares of Common Stock of the Corporation or
(b) a dividend payable in shares of Common Stock of the Corporation.

     10.  AMENDMENT OR TERMINATION OF PLAN. Except as otherwise provided herein,
this Plan may be amended or terminated in whole or in part by the Board of
Directors (in its sole discretion), but no such action shall adversely affect or
alter any right or obligation with respect to any Option, SAR or Stock Option
Agreement then in effect, except to the extent that any such action shall be
required or desirable (in the opinion of the Corporation or its counsel) so that
any Option intended to qualify as an IS0 complies with the Code or any rule or
regulation promulgated or proposed thereunder.

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<PAGE>   7

     11.  BURDEN AND BENEFIT. The terms and provisions of this Plan shall be
binding upon, and shall inure to the benefit of, each Participant and such
Participant's executors and administrators, estate, heirs and personal and legal
representatives.

     12.  HEADINGS. The headings and other captions contained in this Plan are
for convenience and reference only and shall not be used in interpreting,
construing or enforcing any of the provisions of this Plan.

     13.  INTERPRETATION. Notwithstanding any provision of this Plan or any
provision of any Stock Option Agreement evidencing an Option that is intended,
in whole or in part, to qualify as an ISO, this Plan and each such Stock Option
Agreement are intended to comply with all requirements for qualification under
the Code and with any rule or regulation promulgated or proposed thereunder, and
shall be interpreted and construed in a manner which is consistent with this
Plan and each such Stock Option Agreement being so qualified. This Plan shall be
governed by, and construed in accordance with, the substantive laws of the State
of Delaware (other than rules of conflicts-of-law or choice-of-law).

                                      -7-<PAGE>

                                                                     EXHIBIT 4.5

     This is a Security Agreement and a Mortgage of Chattels as Well as a
                  Mortgage of Real Estate and Other Property

                         Ninth Supplemental Indenture

                                     from

                       SAN DIEGO GAS & ELECTRIC COMPANY

                                      to

                 THE BANK OF CALIFORNIA, NATIONAL ASSOCIATION

                                 _____________
                          Dated as of August 1, 1968
<PAGE>

                              TABLE OF CONTENTS*

                                                                           Page

Parties.....................................................................  1
Recitals....................................................................  1

                                   ARTICLE I
                            AMENDMENTS OF INDENTURE

Section 1.    Definition of Permanent Additions.............................  3
Section 2.    Amendment of Section 11 of Article II of Original Indenture...  4
Section 3.    Addition of Section 18 to Article II of Original Indenture....  5
Section 4.    Addition of Clause (2) of Section 2 to Article XI.............  5
Section 5.    Addition of Section 9 to Article XVII of Original Indenture...  5

                                  ARTICLE II
                           MISCELLANEOUS PROVISIONS

Section 1.    This Indenture Supplemental to Indenture of July 1, 1940.....   5
Section 2.    Effective Date...............................................   6
Section 3.    Covenants, Stipulations, Promises and Agreements.............   6

                             -------------------
Signatures and Acknowledgments............................................. 6,7

-----------------------
   * For convenience only and not a part of the Ninth Supplemental Indenture.
<PAGE>

        This Ninth Supplemental Indenture Is a Security Agreement and a
                 Mortgage of Chattels as Well as a Mortgage of
                        Real Estate and Other Property

     THIS NINTH SUPPLEMENTAL INDENTURE, made as of the 1st day of August, 1968,
by and between SAN DIEGO GAS & ELECTRIC COMPANY, a corporation duly organized
and existing under and by virtue of the laws of the State of California, having
its principal office in that State in the City of San Diego (the "Company"), the
party of the first part, and THE BANK OF CALIFORNIA, NATIONAL ASSOCIATION, a
corporation duly organized under an act known as the "National Bank Act," of the
United States of America, having its principal office in the City and County of
San Francisco, State of California, as Trustee (the "Trustee"), the party of the
second part.

     WHEREAS, the Company executed and delivered a Mortgage and Deed of Trust
(the "Original Indenture"), dated July 1, 1940, to the Trustee to secure payment
of the principal of and the interest on all bonds of the Company at any time
outstanding thereunder according to their tenor and effect, and to provide the
terms and provisions with respect to its First Mortgage Bonds, 3/8% Series due
July 1, 1970, issued in the aggregate principal amount of $16,000,000 and
presently outstanding; and

     WHEREAS, the Company executed and delivered to the Trustee a First
Supplemental Indenture dated as of December 1, 1946, a Second Supplemental
Indenture dated as of March 1, 1948, a Third Supplemental Indenture dated as of
April 1, 1952, a Fourth Supplemental Indenture dated as of April 1, 1954, a
Fifth Supplemental Indenture dated as of October 1, 1955, a Sixth Supplemental
Indenture dated as of October 1, 1957, a Seventh Supplemental Indenture, dated
as of October 1, 1960, and an Eighth Supplemental Indenture dated as of March 1,
1967, whereby, among other things, the Company set forth certain of the
particulars of the Bonds of series designated "First Mortgage Bonds, 2 3/4%
Series due December 1, 1981" issued in the aggregate principal amount of
$2,800,000, "First Mortgage Bonds, Series C due 1978" issued in the aggregate
principal amount of $10,000,000, "First Mortgage Bonds, Series D due 1982"
issued in the aggregate principal amount of $12,000,000, "First Mortgage Bonds,
Series E due 1984" issued in the aggregate principal amount of $17,000,000,
"First Mortgage Bonds, Series F due 1985" issued in the aggregate principal
amount of $18,000,000, "First Mortgage Bonds, Series G due 1987" issued in the
aggregate principal amount of $12,000,000, "First Mortgage Bonds, Series H due
1990" issued in the aggregate principal amount of $30,000,000, "First Mortgage
Bonds, Series I due 1997," issued in the aggregate principal amount of
$25,000,000, respectively, all of which First Mortgage Bonds except the 2 3/4%
Series due December 1, 1981 in the principal amount of $2,800,000 (which have
heretofore been retired) are presently issued and outstanding; and

     WHEREAS, the Original Indenture and each of said Supplemental Indentures
have been recorded in the Official Records of the Recorders of the Counties of
San Diego, Orange and Riverside, respectively, as follows:
<PAGE>

<TABLE>
<CAPTION>
                            Official                             Counties of
Document                    Records          San Diego             Orange              Riverside
-----------------------------------------------------------------------------------------------------
<S>                       <C>           <C>                  <C>                  <C>
Original Indenture            Book              1087                 1062                 1765
                              Page               1                   300                  364
                              Date         Oct. 10, 1940        Oct. 10, 1940        July 13, 1955
-----------------------------------------------------------------------------------------------------
First Supplemental            Book              2321                 1506                 1765
Indenture                     Page              48                   472                  499
                              Date         Jan. 2, 1947         Jan. 9, 1947         July 13, 1955
-----------------------------------------------------------------------------------------------------
Second Supplemental           Book              2537                 1616                 1765
Indenture                     Page              363                  190                  448
                              Date         Mar. 16, 1948        Mar. 15, 1948        July 13, 1955
-----------------------------------------------------------------------------------------------------
Third Supplemental            Book              4424                 2311                 1765
Indenture                     Page              535                  116                  475
                              Date         Apr. 3, 1952         Apr. 3, 1952         July 13, 1955
-----------------------------------------------------------------------------------------------------
Fourth Supplemental           Book              5193                 2701                 1765
Indenture                     Page              217                  153                  336
                              Date         Apr. 2, 1954         Apr. 2, 1954         July 13, 1955
-----------------------------------------------------------------------------------------------------
Fifth Supplemental            Book              5893                 3304                 1829
Indenture                     Page              291                  205                  3
                              Date         Dec. 5, 1955         Dec. 5, 1955         Dec. 5, 1955
-----------------------------------------------------------------------------------------------------
Sixth Supplemental            Book              6829                 4099                 2175
Indenture                     Page              390                  109                  538
                              Date         Nov. 12, 1957        Nov. 12, 1957        Nov. 12, 1957
-----------------------------------------------------------------------------------------------------
Seventh Supplemental          Book           Series 1
                                             Book 1960               5455                 2780
Indenture                     Page        File No. 202061            385                  3
                              Date         Oct. 10, 1960        Oct. 10, 1960        Oct. 10, 1960
-----------------------------------------------------------------------------------------------------
Eighth Supplemental           Book         1967 Series 8             8197                20925
Indenture                     Page        File No. 33860             129             (Endorsement
                              Date         Mar. 13, 1967        Mar. 13, 1967            No.)
                                                                                    Mar. 13, 1967;
</TABLE>

and

     WHEREAS, the Company desires to amend the original Indenture as heretofore
amended, supplemented and now in effect, as hereinafter set forth; and

     WHEREAS, the execution and delivery of this Ninth Supplemental Indenture
has been duly authorized by resolution of the Board of Directors of the Company,
has been duly authorized and approved by the Public Utilities Commission of the
State of California and has been approved by the holders of more than 66 2/3% in
principal amount of the First Mortgage Bonds of the Company presently
outstanding; and

                                       2
<PAGE>

     WHEREAS, the Corporation has requested the Trustee to join in the execution
and delivery of this Ninth Supplemental Indenture; and

     WHEREAS, all other acts and things necessary to make this Ninth
Supplemental Indenture a valid, binding and legal instrument and a valid,
binding and legal amendment of the original Indenture, have been duly performed
and done;

     NOW, THEREFORE, in consideration of the premises IT IS HEREBY AGREED AND
PROVIDED:

                                   ARTICLE I
                            AMENDMENTS OF INDENTURE

     Section 1.  The definition of "Permanent Additions" contained in Section 4
of Article I of the Indenture is hereby amended to read as follows:

          "Section 4.  The term "Permanent Additions" shall mean all property,
     real, personal or mixed (including therein, without in anywise limiting or
     impairing by the enumeration of the same, the scope and intent of the
     foregoing except as hereinafter specifically limited, all lands, buildings,
     plants, power houses, dams, reservoirs, stations, lines, gas plants,
     holders, pipes, mains, conduits, cables, machinery, pumps, transmission and
     distribution lines, pipe lines, rights-of-way, distribution systems,
     substations, transformers, meters, service systems and supply systems,
     wires, poles, cross-arms, apparatus, and improvements, extensions and
     additions, including operating public utility properties acquired as an
     entirety whether by purchase, consolidation, merger or otherwise) which
     shall have been made, acquired, constructed or erected by the Company or by
     the Company and one or more other public utilities jointly subsequent to
     June 30, 1940, or in the process of construction or erection in so far as
     actually constructed or erected subsequent to June 30, 1940, and used or to
     be used in the business of generating, manufacturing, storing,
     transporting, transmitting, distributing or supplying electricity or gas
     for light, heat, power, refrigeration or other purposes.  Permanent
     Additions shall also include betterments, improvements, extensions and
     additions to the steam properties owned by the Company on June 30, 1940, if
     made, acquired, constructed or erected by the Company subsequent to June
     30, 1940.  The term "Permanent Additions" shall not include

          (1)  the undivided interest or interests of the one or more other
     public utilities in any such property made, acquired, constructed or
     erected by the Company and one or more other public utilities jointly;

          (2)  any property (other than paving, grading and other improvements
     to public properties) not subject to the lien of this Indenture as a first
     lien except for "permitted liens" as that term is hereinafter defined and
     except for Non-callable Liens as that term is hereinafter defined;

                                       3
<PAGE>

          (3)  any plant used or intended for use in the manufacture of
     artificial gas if acquired in place as an entirety, or substantially as an
     entirety, except a plant built or constructed for the account of the
     Company; or any property used or intended for use in the transmission of
     natural or artificial gas if located outside of San Diego County,
     California, or the counties immediately adjacent thereto;

          (4)  any property acquired by the Company for the purpose of producing
     natural gas, oil or coal, or natural gas or oil rights owned in fee or
     under lease or gas wells or oil wells or equipment therefor, or coal mines
     or equipment therefor;

          (5) any franchises or governmental permits or licenses granted to or
     acquired by the Company as such, separate and distinct from the property
     operated thereunder or in connection therewith;

          (6)  any steam properties except to the extent hereinabove expressly
     permitted;

          (7)  any item of property acquired or constructed to replace a similar
     item of property whose retirement has not been credited to a capital
     account; or any property whose cost has been charged, or is properly
     chargeable, to repairs or maintenance or other operating expense account,
     or whose cost has not been charged, or is not properly chargeable, to a
     capital account; or

          (8)  any leased plant or system or any plant or system located on any
     leased property, easement or right of way terminable after a fixed period
     of time, or any undivided interest therein, or any betterments, extensions,
     improvements or additions of, upon, or to, any such plant or system, to the
     extent that such plant or system or betterments, extensions, improvements
     or additions thereto, may not be capitalized by the Company in accordance
     with the Uniform System of Accounts of the Public Utilities Commission or
     such other commission as may have jurisdiction thereof, or, in the absence
     of any such applicable Uniform System of Accounts, in accordance with
     generally accepted principles of accounting.

     The term Permanent Additions may include properties otherwise conforming to
the foregoing provisions of this Section acquired by the Company by means of or
in connection with the merger into the Company of any other corporation or the
consolidation of the Company with any other corporation or as a part of the
assets of any other corporation acquired as an entirety or substantially as an
entirety."

     Section 2.  Section 11 of Article II is hereby amended to read as follows:

          "Section 11.  In all cases of exchanges of bonds contemplated by the
     next preceding section hereof, the bonds to be exchanged shall be
     surrendered at the office or agency of the Company in such place or places
     as shall be designated for the purpose in such bonds or in this Indenture
     or any supplement thereto, with all unmatured coupons thereto appertaining
     (in the case of coupon bonds) and the Company shall execute and the Trustee
     shall authenticate and deliver in exchange therefor the bond or bonds which
     the
<PAGE>

     bondholder making the exchange shall be entitled to receive. All bonds so
     surrendered for exchange and the coupons appertaining thereto shall be
     cancelled by the Trustee. Notwithstanding any legend endorsed on any
     outstanding registered bond that such bond has been issued in lieu of or in
     exchange for coupon bond(s) of the same issue and series with specified
     numbers and that coupon bond(s) of said issue and series bearing the same
     numbers will be issued in exchange for said registered bond, the Company
     may execute and the Trustee may authenticate and deliver coupon bond(s) of
     the same issue and series bearing different numbers than those specified in
     such legend in exchange for any such registered bond surrendered for
     exchange for coupon bonds, provided that such coupon bonds so issued in
     exchange shall be in the same aggregate principal amount as such registered
     bond surrendered for exchange. Upon every exchange of bonds (including
     transfers of registered bonds without coupons under the provisions of
     Section 12 of this Article), the Company (subject to the provisions of
     Section 14 of this Article) may make a charge therefor sufficient to
     reimburse it for any tax or taxes or other governmental charge required to
     be paid by the Company by reason of such exchange and in addition may
     charge a sum not exceeding Two Dollars ($2) for each bond issued upon any
     such exchange, which shall be paid by the party requesting such exchange as
     a condition precedent to the exercise of the privilege of making such
     exchange. The Company shall not be obligated to make exchanges of bonds for
     a period of ten (10) days next preceding any interest payment date."

     Section 3.  A new section is hereby added to Article II of the original
Indenture to be designated as Section 18 and to read as follows:

          "Section 18.  Notwithstanding any of the terms or provisions of the
     Indenture, or any of the terms or provisions of any of the bonds now or
     hereafter outstanding, whenever in the Indenture or in any bond of any
     series (including series heretofore issued) hereafter authenticated and
     delivered under any provision of the Indenture reference is made to the
     execution, issue or signing of such bond by the Company or an officer
     thereof, or to the attestation of its corporate seal affixed thereto, the
     signature of the proper officer of the Company acting for any such purpose
     may be either a manual signature of such officer or a facsimile thereof."

     Section 4.  Clause (2) of Section 2 of Article XI is hereby amended to read
as follows:

          "(2) cancel, or make changes or alterations in, or substitutions of,
     any and all contracts, leases and easements; or waive the right to
     partition property additions owned as a tenant-in-common with one or more
     other public utilities;"

     Section 5.  A new section is hereby added to Article XVII of the original
Indenture to be designated as Section 9 and to read as follows:

          "Section 9.  Anything in this Article XVII contained to the contrary
     notwithstanding, the Trustee shall receive the written consent or consents
     of the holders of not less than 66 2/3% in principal amount of bonds then
     outstanding and entitled to
<PAGE>

     consent in lieu of the holding of a meeting pursuant to this Article XVII
     and in lieu of all action at such a meeting."

                                  ARTICLE II
                           MISCELLANEOUS PROVISIONS

     Section 1.  This instrument is executed and shall be construed as an
indenture supplemental to the Original Indenture and shall form a part thereof
and, as amended by this Ninth Supplemental Indenture, the Original Indenture, as
heretofore amended and supplemented, is hereby confirmed.

     In order to facilitate the filing of this Ninth Supplemental Indenture the
same may be executed in several counterparts each of which, when so executed,
shall be deemed to be an original, but such counterparts shall constitute but
one and the same instrument.

     Section 2.  This Ninth Supplemental Indenture is dated for convenience
August 1, 1968, although executed and delivered on the date of the
acknowledgment hereof by the Trustee, and the same shall be effective from the
date on which it is so executed and delivered.

     Section 3.  All of the covenants, stipulations, promises and agreements in
this Ninth Supplemental Indenture contained by or on behalf of the Company shall
bind its successors and assigns, whether so expressed or not.

     IN WITNESS WHEREOF, SAN DIEGO GAS & ELECTRIC COMPANY has caused this Ninth
Supplemental Indenture to be signed in its name and behalf by its President or
one of its Vice Presidents and its corporate seal to be hereunto affixed duly
attested by its Secretary or one of its Assistant Secretaries, and THE BANK OF
CALIFORNIA, NATIONAL ASSOCIATION, to evidence its acceptance of the trusts
hereby created, has caused this Ninth Supplemental Indenture to be signed in its
name and behalf by its President or one of its Vice Presidents and its corporate
seal to be hereunto affixed duly attested by its Secretary or one of its
Assistant Secretaries as of the day and year first above written.

                              SAN DIEGO GAS & ELECTRIC COMPANY

                              By  SHERMAN CHICKERING
                                              Vice President
Attest:

C. HAYDEN AMES
             Assistant Secretary
[Corporate Seal]

                              THE BANK OF CALIFORNIA, NATIONAL ASSOCIATION

                              By  R. G. FUNSTON
                                              Vice President
Attest:

W. E. SHEEHAN
             Assistant Secretary
[Corporate Seal]
<PAGE>

State of California
City and County of San Francisco--ss.

     On this 1st day of August, 1968, before me, ELLEN SMITH, a Notary Public in
and for said City and County and State, personally appeared SHERMAN CHICKERING,
known to me to be Vice President and C. HAYDEN AMES, known to me to be Assistant
Secretary of SAN DIEGO GAS & ELECTRIC COMPANY, a California corporation, one of
the corporations that executed the within instrument, and known to me to be the
persons who executed the within instrument on behalf of the corporation therein
named, and acknowledged to me that such corporation executed the same.

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

                                                    ELLEN SMITH
                                   Notary Public in and for the City and County
                                       of San Francisco, State of California

My Commission expires Feb. 14, 1972

[Notarial Seal]

State of California
City and County of San Francisco--ss.

     On this 8 day of August, 1968, before me, SELMA R. CONLAN, a Notary Public
in and for said City and County and State, personally appeared R. G. FUNSTON,
known to me to be Vice President, and W. E. SHEEHAN, known to me to be Assistant
Secretary of THE BANK OF CALIFORNIA, NATIONAL ASSOCIATION, a corporation duly
organized under an act known as the "National Bank Act," of the United States of
America, one of the corporations that executed the within instrument, and known
to me to be the persons who executed the within instrument on behalf of the
corporation therein named, and acknowledged to me that such corporation executed
the same as trustee.

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

                                                  SELMA R. CONLAN
                                  Notary Public in and for the City and County
                                       of San Francisco, State of California

My Commission expires July 5, 1969

[Notarial Seal]

     Executed counterparts of the foregoing Ninth Supplemental Indenture were
recorded on August 14, 1968, Series 9 Book 1968 of Official Records of the
County Recorder of San Diego County, California File/Page No. 138926; in
Official Record Book 8691, at page 69 of the County Recorder of Orange County,
California; and under Recorder's Endorsement No. 78781 of the County Recorder of
Riverside County, California.

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