CALPINE CORP
SC 13G/A, 1999-02-12
COGENERATION SERVICES & SMALL POWER PRODUCERS
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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.   2   )*
                                         -------

                              Calpine Corporation
- ------------------------------------------------------------------------------
                                (Name of Issuer)

                         Common Stock, $.001 par value
- ------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   131347106
                              --------------------
                                 (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. 131347106             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

      NUMBER OF               -0- shares
       SHARES          -------------------------------------------------------
    BENEFICIALLY         6    SHARED VOTING POWER
      OWNED BY
        EACH                  -0- shares
      REPORTING        -------------------------------------------------------
       PERSON            7    SOLE DISPOSITIVE POWER
        WITH
                              -0- shares
                       -------------------------------------------------------
                         8    SHARED DISPOSITIVE POWER

                              -0- shares
- ------------------------------------------------------------------------------
   9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

         -0- 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)

        0%

- ------------------------------------------------------------------------------
  12    TYPE OF REPORTING PERSON *

        IA

- ------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>   3


- -------------------                              ----------------------------

CUSIP NO. 131347106             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
     NUMBER OF
      SHARES                  -0- shares
   BENEFICIALLY        -------------------------------------------------------
     OWNED BY            6    SHARED VOTING POWER
       EACH
     REPORTING                -0- shares
      PERSON          -------------------------------------------------------
       WITH              7     SOLE DISPOSITIVE POWER

                              -0- shares
                    -------------------------------------------------------
                         8    SHARED DISPOSITIVE POWER

                              -0- shares
- ------------------------------------------------------------------------------
   9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        -0- 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)

        0%

- ------------------------------------------------------------------------------
  12    TYPE OF REPORTING PERSON *

        CO

- ------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>   4

- -------------------                              ----------------------------

CUSIP NO. 131347106             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
      NUMBER OF
       SHARES                 -0- shares
    BENEFICIALLY       -------------------------------------------------------
      OWNED BY           6    SHARED VOTING POWER
        EACH
      REPORTING               -0- shares
       PERSON         -------------------------------------------------------
        WITH             7    SOLE DISPOSITIVE POWER

                              -0- shares
                     -------------------------------------------------------
                         8    SHARED DISPOSITIVE POWER

                              -0- shares
- ------------------------------------------------------------------------------
   9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        -0- 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)

        0%

- ------------------------------------------------------------------------------
  12    TYPE OF REPORTING PERSON *

        IN

- ------------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>   5




Item 1(a).     Name of Issuer:  Calpine Corporation (the "Issuer").

Item 1(b).     Address of Issuer's Principal Executive Offices:
               50 West San Fernando Street, San Jose, CA 95113

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, $.001 par value
               ("Common Stock").

Item 2(e).     CUSIP Number:  131347106

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 0 shares of Common Stock at December
               31, 1998. BPAM owns of record 0 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 0 shares of Common Stock of the
               Issuer.

      (b)      Percent of Class: 0 % for all Reporting Persons. The foregoing
               percentage is calculated based on the 20,151,581 shares of
               Common Stock outstanding on November 9, 1998, as reported on the
               Form 10Q 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: 0 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: 0
                      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 0 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 Calpine Corporation.

        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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