Certificate Number:                              Number of Common Securities:
      -------                                              --------

                         Convertible Common Securities
                                       of
                          CalEnergy Capital Trust ____

                       __% Convertible Common Securities
            (liquidation amount $50 per Convertible Common Security)

         CalEnergy Capital Trust ___, a statutory business trust formed under
the laws of the State of Delaware (the "Trust"), hereby certifies that
CALENERGY COMPANY, INC. (the "Holder") is the registered owner of common
securities of the Trust representing undivided beneficial interests in the
assets of the Trust designated the __% Convertible Common Securities
(liquidation amount $50 per Convertible Common Security) (the "Common
Securities"). The Common Securities are transferable on the books and records
of the Trust, in person or by a duly authorized attorney, upon surrender of
this certificate duly endorsed and in proper form for transfer. The
designation, rights, privileges, restrictions, preferences and other terms and
provisions of the Common Securities represented hereby are issued and shall in
all respects be subject to the provisions of the Amended and Restated
Declaration of Trust of the Trust dated as of _____________, 1997, as the same
may be amended from time to time (the "Declaration"), including the designation
of the terms of the Common Securities as set forth in Annex I to the
Declaration. Capitalized terms used herein but not defined shall have the
meaning given them in the Declaration. The Holder is entitled to the benefits
of the Common Securities Guarantee to the extent provided therein. The Sponsor
will provide a copy of the Declaration, the Common Securities Guarantee and the
Indenture to a Holder without charge upon written request to the Sponsor at its
principal place of business.

         Reference is hereby made to select provisions of the Common Securities
set forth on the reverse hereof, which select provisions shall for all purposes
have the same effect as if set forth at this place.

         Upon receipt of this certificate, the Sponsor is bound by the
Declaration and is entitled to the benefits thereunder.



         By acceptance, the Holder agrees to treat for United States federal
income tax purposes the Debentures as indebtedness and the Common Securities as
evidence of indirect beneficial ownership in the Debentures.

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         IN WITNESS WHEREOF, the Trust has executed this certificate this __th
day of ______, 1997.

                                            CalEnergy Capital Trust ___


                                            By:
                                               ------------------------------
                                               Name:  Steven A. McArthur
                                               Title: Regular Trustee



                              REVERSE OF SECURITY

         Distributions payable on each Common Security will be fixed at a rate
per annum of ___% (the "Coupon Rate") of the stated liquidation amount of $50
per Common Security, such rate being the rate of interest payable on the
Debentures to be held by the Property Trustee. Distributions in arrears for
more than one quarter will bear interest thereon compounded quarterly at the
Coupon Rate (to the extent permitted by applicable law). The term
"Distributions" as used herein includes such cash distributions and any such
interest payable unless otherwise stated. A Distribution is payable only to the
extent that payments are made in respect of the Debentures held by the Property
Trustee and to the extent the Property Trustee has funds available therefor.
The amount of Distributions payable for any period will be computed for any
full quarterly Distribution period on the basis of a 360-day year of twelve
30-day months, and for any period shorter than a full quarterly Distribution
period for which Distributions are computed, Distributions will be computed on
the basis of the actual number of days elapsed per 30-day month.

         Except as otherwise described below, distributions on the Common
Securities will be cumulative, will accrue from __________, 1997 or from the
most recent distribution date to which interest has been paid or duly provided
for and will be payable quarterly in arrears, on March 1, June 1, September 1
and December 1 of each year, commencing on __________, 1997, to Holders of
record fifteen (15) days prior to such payment dates, which payment dates shall
correspond to the interest payment dates on the Debentures. The Debenture
Issuer has the right under the Indenture to defer payments of interest on the
Debentures by extending the interest payment period from time to time on the
Debentures for successive periods not exceeding 20 consecutive quarters (each
an "Extension Period") during which Extension Periods no interest shall be due
and payable on the Debentures; provided, that no Extension Period shall last
beyond the date of maturity of the Debentures, as then in effect, or any
earlier redemption date. As a consequence of such extension, Distributions will
also be deferred. Despite such extension, quarterly Distributions will continue
to accrue with interest thereon (to the extent permitted by applicable law) at
the Coupon Rate compounded quarterly during the Extension Periods. Prior to the
termination of any Extension Period,

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the Debenture Issuer may elect to continue to defer payments of interest for
another consecutive Extension Period; provided, that any such continued
Extension Period, together with all such previous and consecutive Extension
Periods, may not exceed 20 consecutive quarters. Payments of accrued
Distributions will be payable to Holders as they appear on the books and
records of the Trust on the first record date after the end of the Extension
Period. Upon the termination of any Extension Period and the payment of all
amounts then due, the Debenture Issuer may commence a new Extension Period,
subject to the above requirements.

         The Common Securities shall be redeemable as provided in the
Declaration.

         The Common Securities shall be convertible into shares of Common Stock
of CalEnergy Company, Inc., through (i) the exchange of Common Securities for a
portion of the Debentures and (ii) the immediate conversion of such Debentures
into Common Stock of CalEnergy Company, Inc., in the manner and according to
the terms set forth in the Declaration.

                                       5



                               CONVERSION REQUEST

To:  THE BANK OF NEW YORK
       CalEnergy Capital Trust ___

         The undersigned owner of these Common Securities hereby irrevocably
exercises the option to convert these Common Securities, or the portion below
designated, into Common Stock of CALENERGY COMPANY, INC. (the "CalEnergy Common
Stock") in accordance with the terms of the Amended and Restated Declaration of
Trust (the "Declaration"), dated as of ____________, 1997, by ________________,
______________ and _______________, as Regular Trustees, The Bank of New York
(Delaware), as Delaware Trustee, The Bank of New York, as Property Trustee,
CalEnergy Company, Inc., as Sponsor, and by the Holders, from time to time, of
individual beneficial interests in the Trust to be issued pursuant to the
Declaration. Pursuant to the aforementioned exercise of the option to convert
these Common Securities, the undersigned hereby directs the Conversion Agent
(as that term is defined in the Declaration) to (i) exchange such Common
Securities for a portion of the Debentures (as that term is defined in the
Declaration) held by the Trust (at the rate of exchange specified in the terms
of the Common Securities set forth as Annex I to the Declaration) and (ii)
immediately convert such Debentures on behalf of the undersigned, into
CalEnergy Common Stock (at the conversion rate specified in the terms of the
Common Securities set forth as Annex I to the Declaration).

         The undersigned does also hereby direct the Conversion Agent that the
shares issuable and deliverable upon conversion, together with any check in
payment for fractional shares, be issued in the name of and delivered to the
undersigned, unless a different name has been indicated in the assignment
below. If shares are to be issued in the name of a person other than the
undersigned, the undersigned will pay all transfer taxes payable with respect
thereto.

                                       6



         Any holder, upon the exercise of its conversion rights in accordance
with the terms of the Declaration and the Common Securities, agrees to be bound
by the terms of the Registration Rights Agreement relating to the CalEnergy
Common Stock issuable upon conversion of the Common Securities.

Dated: ________________

         in whole __                        in part __

                                            Number of Common Securities to be
                                            converted:

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

                                            If a name or names other than the
                                            undersigned, please indicate in the
                                            spaces below the name or names in
                                            which the shares of CalEnergy
                                            Common Stock are to be issued,
                                            along with the address or addresses
                                            of such person or persons

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

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

                                            -----------------------------------
                                            Signature (for conversion only)

                                            Please Print or Typewrite Name and
                                            Address, Including Zip Code, and
                                            Social Security or Other
                                            Identifying Number

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

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

                                            -----------------------------------
                                            Signature Guarantee:*
                                                                 --------------

- --------------
*   (Signature must be guaranteed by an "eligible guarantor institution" that
    is, a bank, stockbroker, savings and loan association or credit union
    meeting the requirements of the Registrar, which requirements include
    membership or participation in the Securities Transfer Agents Medallion
    Program ("STAMP") or such other "signature guarantee program" as may be
    determined by the Registrar in addition to, or in substitution for,
    STAMP, all in accordance with the Securities Exchange Act of 1934, as
    amended.)

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


                                   ASSIGNMENT

FOR VALUE RECEIVED, the undersigned assigns and transfers this Common Security
Certificate to:

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(Insert assignee's social security or tax identification number)


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

- -------------------------------------------------------------------------------
(Insert address and zip code of assignee)

and irrevocably appoints

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agent to transfer this Common Security Certificate on the books of the Trust.
The agent may substitute another to act for him or her.

Date:
     -----------------------------
Signature:
          ------------------------

      (Sign exactly as your name appears on the other side of this Common
                             Security Certificate)

Signature Guarantee**:
                      ---------------------------------------------------------

- --------------
**  (Signature must be guaranteed by an "eligible guarantor institution" that
    is, a bank, stockbroker, savings and loan association or credit union
    meeting the requirements of the Registrar, which requirements include
    membership or participation in the Securities Transfer Agents Medallion
    Program ("STAMP") or such other "signature guarantee program" as may be
    determined by the Registrar in addition to, or in substitution for,
    STAMP, all in accordance with the Securities Exchange Act of 1934, as
    amended.)

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