PUBLIC SERVICE CO OF NEW MEXICO
SC 13G/A, 1999-02-12
ELECTRIC & OTHER SERVICES COMBINED
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<PAGE>   1





                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13G


                   UNDER THE SECURITIES EXCHANGE ACT OF 1934

                           (AMENDMENT NO.     3    )*
                                          ---------


                      Public Service Company of New Mexico
- -------------------------------------------------------------------------------
                                (Name of Issuer)

                         Common Stock, $5.00 par value
- -------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   744499104
                               -----------------
                                 (CUSIP Number)

            December 31, 1998  - Amendment pursuant to Rule 13d-2(b)
- -------------------------------------------------------------------------------
           (Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

         [X] Rule 13d-1(b)

         [ ] Rule 13d-1(c)

         [ ] Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities,
and for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).





<PAGE>   2





- ----------------------                     ----------------------------------
                                     
CUSIP NO. 744499104             13G        Page    1     of    3    Pages
                                                 --------    -------
- ----------------------                     ----------------------------------
- -----------------------------------------------------------------------------
    1     NAME OF REPORTING PERSON                                           
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                  
                                                                             
          Boston Partners Asset Management, L.P.                             
                                                                             
- -----------------------------------------------------------------------------
    2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*           (a) [ ] 
                                                                      (b) [ ] 
          Not applicable                                                     
                                                                             
- -----------------------------------------------------------------------------
    3     SEC USE ONLY                                                       
                                                                             
                                                                             
                                                                             
- -----------------------------------------------------------------------------
    4     CITIZENSHIP OR PLACE OF ORGANIZATION                               
                                                                             
          Delaware                                                           
                                                                             
- -----------------------------------------------------------------------------
                             5     SOLE VOTING POWER                         
                                                                             
                                   -0- shares                                
        NUMBER OF          --------------------------------------------------
          SHARES             6     SHARED VOTING POWER                       
       BENEFICIALLY                                                          
         OWNED BY                  1,399,008 shares                          
           EACH            --------------------------------------------------
        REPORTING            7     SOLE DISPOSITIVE POWER                    
          PERSON                                                             
           WITH                    -0- shares                                
                                                                             
                           --------------------------------------------------
                             8     SHARED DISPOSITIVE POWER                  
                                                                             
                                   1,399,008 shares                          
- -----------------------------------------------------------------------------
    9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON       
                                                                             
          1,399,008 shares                                                   
- -----------------------------------------------------------------------------
   10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN   [ ] 
          SHARES*                                                            
                                                                             
          Not applicable                                                     
- -----------------------------------------------------------------------------
   11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)                  
                                                                             
          3.4%                                                               
                                                                             
- -----------------------------------------------------------------------------
   12     TYPE OF REPORTING PERSON *                                         
                                                                             
          IA                                                                 
- -----------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>   3



- ----------------------                   -----------------------------------
                                        
CUSIP NO. 744499104           13G         Page     2     of    3     Pages
                                               ---------    --------
- ----------------------                   -----------------------------------
- ----------------------------------------------------------------------------
    1     NAME OF REPORTING PERSON                                          
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                 
                                                                            
          Boston Partners, Inc.                                             
                                                                            
- ----------------------------------------------------------------------------
    2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*          (a) [ ]
                                                                     (b) [ ]
          Not applicable                                                    
                                                                            
- ----------------------------------------------------------------------------
    3     SEC USE ONLY                                                      
                                                                            
                                                                            
                                                                            
- ----------------------------------------------------------------------------
    4     CITIZENSHIP OR PLACE OF ORGANIZATION                              
                                                                            
          Delaware                                                          
                                                                            
- ----------------------------------------------------------------------------
                             5     SOLE VOTING POWER                        
                                                                            
                                   -0- shares                               
        NUMBER OF           ------------------------------------------------
          SHARES             6     SHARED VOTING POWER                      
       BENEFICIALLY                                                         
         OWNED BY                  1,399,008 shares                         
           EACH             ------------------------------------------------
        REPORTING            7     SOLE DISPOSITIVE POWER                   
          PERSON                                                            
           WITH                    -0- shares                               
                                                                            
                            ------------------------------------------------
                             8     SHARED DISPOSITIVE POWER                 
                                                                            
                                   1,399,008 shares                         
- ----------------------------------------------------------------------------
    9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON      
                                                                            
          1,399,008 shares                                                  
- ----------------------------------------------------------------------------
   10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN  [ ]
          SHARES*                                                           
                                                                            
          Not applicable                                                    
- ----------------------------------------------------------------------------
   11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)                 
                                                                            
          3.4%                                                              
                                                                            
- ----------------------------------------------------------------------------
   12     TYPE OF REPORTING PERSON *                                        
                                                                            
          CO                                                                
- ----------------------------------------------------------------------------


                     *SEE INSTRUCTIONS BEFORE FILLING OUT!





<PAGE>   4





- ----------------------                    ----------------------------------
                                          
CUSIP NO. 744499104            13G         Page    3     of    3     Pages
                                                --------    --------
- ----------------------                    ----------------------------------
- ----------------------------------------------------------------------------
    1     NAME OF REPORTING PERSON                                          
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                 
                                                                            
          Desmond John Heathwood                                            
                                                                            
- ----------------------------------------------------------------------------
    2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*          (a) [ ]
                                                                     (b) [ ]
          Not applicable                                                    
                                                                            
- ----------------------------------------------------------------------------
    3     SEC USE ONLY                                                      
                                                                            
                                                                            
                                                                            
- ----------------------------------------------------------------------------
    4     CITIZENSHIP OR PLACE OF ORGANIZATION                              
                                                                            
          United States                                                     
                                                                            
- ----------------------------------------------------------------------------
                             5     SOLE VOTING POWER                        
                                                                            
                                   -0- shares                               
        NUMBER OF           ------------------------------------------------
          SHARES             6     SHARED VOTING POWER                      
       BENEFICIALLY                                                         
         OWNED BY                  1,399,008 shares                         
           EACH             ------------------------------------------------
        REPORTING            7     SOLE DISPOSITIVE POWER                   
          PERSON                                                            
           WITH                    -0- shares                               
                                                                            
                            ------------------------------------------------
                             8     SHARED DISPOSITIVE POWER                 
                                                                            
                                   1,399,008 shares                         
- ----------------------------------------------------------------------------
    9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON      
                                                                            
          1,399,008 shares                                                  
- ----------------------------------------------------------------------------
   10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN  [ ]
          SHARES*                                                           
                                                                            
          Not applicable                                                    
- ----------------------------------------------------------------------------
   11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)                 
                                                                            
          3.4%                                                              
                                                                            
- ----------------------------------------------------------------------------
   12     TYPE OF REPORTING PERSON *                                        
                                                                            
          IN                                                                
- ----------------------------------------------------------------------------


                     *SEE INSTRUCTIONS BEFORE FILLING OUT!





<PAGE>   5



Item 1(a).       Name of Issuer:  Public Service Company of New Mexico (the
                 "Issuer").

Item 1(b).       Address of Issuer's Principal Executive Offices:
                 Alvarado Square, Albuquerque, NM 87158

Item 2(a).       Names of Persons Filing:  Boston Partners Asset Management,
                 L.P. ("BPAM"), Boston Partners, Inc. ("Boston Partners"), and
                 Desmond John Heathwood.  BPAM, Boston Partners, and Mr.
                 Heathwood are sometimes referred to collectively herein as the
                 "Reporting Persons."

Item 2(b).       Address of Principal Business Office or, if None, Residence:
                 The address of the principal business office of BPAM, Boston
                 Partners, and Mr. Heathwood is 28 State Street, 20th Floor,
                 Boston, MA 02109.

Item 2(c).       Citizenship:  BPAM is a Delaware limited partnership.  Boston
                 Partners is a Delaware corporation.  Mr. Heathwood is a United
                 States citizen.

Item 2(d).       Title of Class of Securities:  Common Stock, $5.00 par value
                 ("Common Stock").

Item 2(e).       CUSIP Number:  744499104

Item 3.          If this statement is filed pursuant to Rule 13d-1(b) or
                 13d-2(b) or (c), check whether the person filing is a:

                          (a)     [    ]   Broker or dealer registered under
                                           section 15 of the Act (15 U.S.C.
                                           78o).

                          (b)     [    ]   Bank as defined in section 3(a)(6)
                                           of the Act (15 U.S.C. 78c).

                          (c)     [    ]   Insurance Company as defined in
                                           section 3(a)(19) of the Act (15
                                           U.S.C. 78c).

                          (d)     [    ]   Investment Company registered under
                                           section 8 of the Investment Company
                                           Act of 1940 (15 U.S.C. 80a-8).

                          (e)     [  X ]   An investment adviser in accordance
                                           with Rule 13d-1(b)(1)(ii)(E);

                          (f)     [    ]   An employee benefit plan or
                                           endowment fund in accordance with
                                           Rule 13d-1(b)(1)(ii)(F);

                          (g)     [    ]   A parent holding company or control
                                           person in accordance with Rule
                                           13d-1(b)(1)(ii)(G);





<PAGE>   6



                          (h)     [    ]   A savings association as defined in
                                           section 3(b) of the Federal Deposit
                                           Insurance Act (12 U.S.C. 1813);

                          (i)     [    ]   A church plan that is excluded from
                                           the definition of an investment
                                           company under section 3(c)(14) of
                                           the Investment Company Act of 1940
                                           (15 U.S.C. 80a-3);

                          (j)     [    ]   Group, in accordance with Rule
                                           13d-1(b)(1)(ii)(J).

Item 4.          Ownership.

      (a)        Amount Beneficially Owned:  Each of the Reporting Persons may
                 be deemed to own beneficially 1,399,008 shares of Common Stock
                 at December 31, 1998.  BPAM owns of record 1,399,008 shares of
                 Common Stock. As sole general partner of BPAM, Boston Partners
                 may be deemed to own beneficially all of the shares of Common
                 Stock that BPAM may be deemed to own beneficially.  As
                 principal stockholder of Boston Partners, Mr. Heathwood may be
                 deemed to own beneficially all of the Common Stock that Boston
                 Partners may be deemed to own beneficially.  Therefore, each
                 of the Reporting Persons may be deemed to own beneficially
                 1,399,008 shares of Common Stock of the Issuer.

      (b)        Percent of Class:  3.4% for all Reporting Persons.  The
                 foregoing percentage is calculated based on the 41,774,083
                 shares of Common Stock outstanding on October 31, 1998 as
                 reported on the Form 10-Q for the quarter ended September 30,
                 1998.

      (c)        Number of shares as to which such person has:

                 (i)      sole power to vote or to direct the vote:  0 shares
                          for all Reporting Persons.

                 (ii)     shared power to vote or to direct the vote: 1,399,008
                          shares for all Reporting Persons.

                 (iii)    sole power to dispose or to direct the disposition
                          of:  0 shares for all Reporting Persons.

                 (iv)     shared power to dispose or to direct the disposition
                          of:  1,399,008 shares for all Reporting Persons.

                 Pursuant to Rule 13d-4, each of Boston Partners and Mr.
                 Heathwood expressly disclaims beneficial ownership of any
                 shares of Common Stock of the Issuer.

Item 5.          Ownership of Five Percent or Less of a Class.





<PAGE>   7




                 If this statement is being filed to report that as of the date
                 hereof the Reporting Persons have ceased to be the beneficial
                 owners of more than five percent of the Common Stock of the
                 Issuer, check the following [  X  ].

Item 6.          Ownership of More than Five Percent on Behalf of Another
                 Person.

                 BPAM holds all of the above 1,399,008 shares under management
                 for its clients, who have the right to direct the receipt of
                 dividends, to receive dividends from such shares and to
                 receive the proceeds from the sale of such shares.  None of
                 these clients holds more than five percent of the Common Stock
                 of the Issuer.

Item 7.          Identification and Classification of the Subsidiary Which
                 Acquired the Security Being Reported on by the Parent Holding
                 Company.

                 Not applicable.

Item 8.          Identification and Classification of Members of the Group.

                 Not applicable.  BPAM, Boston Partners and Mr. Heathwood
                 expressly disclaim membership in a "group" as defined in Rule
                 13d-5(b)(1).

Item 9.          Notice of Dissolution of Group.

                 Not applicable.

Item 10.         Certification.

                 By signing below we certify that, to the best of our knowledge
                 and belief, the securities referred to above were acquired and
                 are held in the ordinary course of business and were not
                 acquired and are not held for the purpose of or with the
                 effect of changing or influencing the control of the issuer of
                 the securities and were not acquired and are not held in
                 connection with or as participant in any transaction having
                 that purpose or effect.





<PAGE>   8



                                   SIGNATURE

                 After reasonable inquiry and to the best of our knowledge and
belief, we certify that the information set forth in this statement is true,
complete and correct.  We also hereby agree to file this statement jointly
pursuant to the agreement set forth as Exhibit 1 hereto.

Dated:  February 12, 1999

BOSTON PARTNERS ASSET MANAGEMENT, L.P.

By:      Boston Partners, Inc.,
         its general partner


         By:     /s/ Mary Ann Iudice
                 -------------------
                 William J. Kelly
                 Treasurer and Senior Vice President
                 by:      Mary Ann Iudice
                          Attorney-in-Fact*

BOSTON PARTNERS, INC.


         By:     /s/ Mary Ann Iudice
                 -------------------
                 William J. Kelly
                 Treasurer and Senior Vice President
                 by:      Mary Ann Iudice
                          Attorney-in-Fact*



/s/ Mary Ann Iudice
- -------------------
Desmond John Heathwood
by:      Mary Ann Iudice
         Attorney-in-Fact**

*        Signed pursuant to a Power of Attorney executed by William J. Kelly, a
copy of which is filed herewith.

**       Signed pursuant to a Power of Attorney executed by Desmond John
Heathwood, a copy of which is filed herewith.





<PAGE>   9



                                                                       Exhibit 1

                                   AGREEMENT

         Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of
1934, the undersigned hereby agree that only one statement containing the
information required by Schedule 13G need be filed with respect to the
ownership by each of the undersigned of shares of Common Stock of Public
Service Company of New Mexico.

         This Agreement may be executed in any number of counterparts, each of
which shall be deemed an original.

         EXECUTED this 12th day of February, 1999.

BOSTON PARTNERS ASSET MANAGEMENT, L.P.

By:      Boston Partners, Inc.
         its general partner

         By:     /s/ Mary Ann Iudice
                 -------------------
                 William J. Kelly
                 Treasurer and Senior Vice President
                 by:      Mary Ann Iudice
                          Attorney-in-Fact*


BOSTON PARTNERS, INC.

         By:     /s/ Mary Ann Iudice
                 -------------------
                 William J. Kelly
                 Treasurer and Senior Vice President
                 by:      Mary Ann Iudice
                          Attorney-in-Fact*


/s/ Mary Ann Iudice
- -------------------
Desmond John Heathwood
by:      Mary Ann Iudice
         Attorney-in-Fact**

*        Signed pursuant to a Power of Attorney executed by William J. Kelly, a
copy of which is filed herewith.

**       Signed pursuant to a Power of Attorney executed by Desmond John
Heathwood, a copy of which is filed herewith.






<PAGE>   1
                                                                    EXHIBIT 24.1

                               POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS, that the undersigned, Desmond John
Heathwood, hereby constitutes and appoints William J. Kelly and Mary Ann
Iudice his true and lawful attorneys-in-fact and agents, for him and in his
name, place and stead, to sign any Schedule 13G or Schedule 13D relating to
beneficial ownership and changes in beneficial ownership of equity securities
of the companies set forth on Exhibit A hereto (each, a "Company" and,
collectively, the "Companies"), and any amendment thereto, and to file the
same, with all exhibits thereto and other documents in connection therewith,
with the U.S. Securities and Exchange Commission, and submit copies thereof to
any securities exchange or automated quotation system and to the applicable
Company, granting unto said attorneys-in-fact and agents full power and
authority to do and perform each and every act and thing requisite or necessary
to be done, as fully to all intents and purposes as the undersigned might or
could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents may lawfully do or cause to be done by virtue
hereof.  This power-of-attorney shall expire at such time as the undersigned
ceases to be subject to filing requirements under Section 13(d) and/or 13(g)
under the Securities and Exchange Act of 1934, as amended, with respect to the
Companies.


                                   /s/ Desmond J. Heathwood
                                   ------------------------
                                   Desmond John Heathwood

                                   Dated: February 9, 1998





<PAGE>   2



                                                                       EXHIBIT A

                     Companies Subject to Power of Attorney
                          Dated as of February 9, 1998


               American General Hospitality Corporation
               Bank Plus Corporation
               Calpine Corporation
               Chris-Craft Industries, Inc.
               Golden State Bancorp, Inc.
               Mid-America Apartment Communities, Inc.
               Public Service Company of New Mexico
               RFS Hotel Investors, Inc.
               Security-Connecticut Corporation
               Shopko Stores, Inc.
               SLM Holding Corporation
               The Vanguard Group, Gemini II Inc. (closed end fund)
               Wang Laboratories, Inc.
               Allmerica Financial Corporation
               BJ's Wholesale Club, Inc.
               Bowne & Co., Inc.
               Caltec Net Lease Realty, Inc.
               Chiquita Brands International, Inc.
               Equity Inns, Inc.
               Harcourt General, Inc.
               Highlands Insurance Group, Inc.
               Horace Mann Educators Corporation
               IPC Holdings, Ltd.
               Long Island Lighting Company
               Moog, Inc.
               National Presto Industries, Inc.
               PFF Bancorp, Inc.
               WMS Industries Inc.
               Woolworth Corporation






<PAGE>   1
                                                                    Exhibit 24.2

                               POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS, that the undersigned, William J.
Kelly, Treasurer and Senior Vice President of Boston Partners, Inc., hereby
constitutes and appoints Mary Ann Iudice his true and lawful attorney-in-fact
and agent, for him and in his name, place and stead, to sign any Schedule 13G
or Schedule 13D relating to beneficial ownership and changes in beneficial
ownership of equity securities of the companies set forth on Exhibit A hereto
(each, a "Company" and, collectively, the "Companies"), and any amendment
thereto, and to file the same, with all exhibits thereto and other documents in
connection therewith, with the U.S.  Securities and Exchange Commission, and
submit copies thereof to any securities exchange or automated quotation system
and to the applicable Company, granting unto said attorney-in-fact and agent
full power and authority to do and perform each and every act and thing
requisite or necessary to be done, as fully to all intents and purposes as the
undersigned might or could do in person, hereby ratifying and confirming all
that said attorney-in-fact and agent may lawfully do or cause to be done by
virtue hereof.  This power-of-attorney shall expire at such time as Boston
Partners, Inc. ceases to be subject to filing requirements under Section 13(d)
and/or 13(g) under the Securities and Exchange Act of 1934, as amended, with
respect to the Companies.


                                                   /s/ William J. Kelly
                                                   --------------------
                                                   William J. Kelly

                                                   Dated: February 8, 1998
<PAGE>   2
                                                                       EXHIBIT A

                     Companies Subject to Power of Attorney
                          Dated as of February 9, 1998


                   American General Hospitality Corporation
                   Bank Plus Corporation
                   Calpine Corporation
                   Caltec Net Lease Realty, Inc.
                   Chris-Craft Industries, Inc.
                   Golden State Bancorp, Inc.
                   Mid-America Apartment Communities, Inc.
                   Public Service Company of New Mexico
                   RFS Hotel Investors, Inc.
                   Security-Connecticut Corporation
                   Shopko Stores, Inc.
                   SLM Holding Corporation
                   The Vanguard Group, Gemini II Inc. (closed end fund)
                   Wang Laboratories, Inc.
                   WMS Industries Inc.
                   Woolworth Corporation





<PAGE>   3
                          CERTIFICATE OF THE SECRETARY

         The undersigned, Desmond John Heathwood, Secretary of Boston Partners,
Inc., a Delaware corporation (the "Company"), DOES HEREBY CERTIFY THAT the
resolutions set forth below are true and correct copies of resolutions adopted
by the Board of Directors of the Company by unanimous written consent dated
February 9, 1998; and such resolutions are in full force and effect on the date
hereof:

                           Resolutions Adopted by the
                  Board of Directors of Boston Partners, Inc.
              by Unanimous Written Consent Dated February 9, 1998

                  RESOLVED, that each officer of the Company who may be
         required to sign and execute any Schedule 13G or Schedule 13D
         relating to beneficial ownership and changes in beneficial
         ownership of equity securities with respect to which the
         Company is subject to filing requirements under Section 13(d)
         or 13(g) under the Securities and Exchange Act of 1934, as
         amended ("Section 13 Filings"), be and hereby is authorized to
         execute a power of attorney appointing Mary Ann Iudice his
         true and lawful attorney-in-fact and agent, for him and in his
         name, place and stead, to sign any Section 13 Filings, and any
         amendment thereto, and to file the same, with all exhibits
         thereto and other documents in connection therewith, with the
         U.S. Securities and Exchange Commission, and submit copies
         thereof to any securities exchange or automated quotation
         system and to the applicable Company, granting unto said
         attorney-in-fact and agent full power and authority to do and
         perform each and every act and thing requisite or necessary to
         be done, as fully to all intents and purposes as the
         undersigned might or could do in person, hereby ratifying and
         confirming all that said attorney-in-fact and agent may
         lawfully do or cause to be done by virtue hereof.

         WITNESS my hand and the seal of the Company this 9th day of February,
1998.


                                                   /s/ Desmond John Heathwood
                                                   --------------------------
[Corporate Seal]                                   Desmond John Heathwood
                                                   Secretary







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