EXHIBIT 99.1


              UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL DATA

     On August 11,  1998,  Registrant  (then known as  CalEnergy  Company,  Inc.
("Company")  entered  into  an  Agreement  and  Plan of  Merger  with  MHC  Inc.
("Merger"),  then known as MidAmerican  Energy  Holdings  Company  ("MHC").  The
Merger  closed on March 12,  1999 and  Registrant  paid  $27.15 in cash for each
outstanding share of MHC common stock for a total of approximately $2.42 billion
in a merger, pursuant to which MHC became an indirect wholly owned subsidiary of
the Company.  Additionally,  Registrant  reincorporated in the State of Iowa and
was renamed  MidAmerican  Energy  Holdings  Company and upon  closing  became an
exempt public utility holding company.

     The  Company  and its  wholly  owned  subsidiary  MidAmerican  Funding  LLC
("Funding")  financed the purchase of all outstanding shares of MHC common stock
with the net proceeds of a $700 million  offering of  Funding's  senior  secured
notes and bonds and an equity  contribution  from  Registrant.  A portion of the
Company  equity  contribution  was provided from  approximately  $940 million in
proceeds to the Company from its sale of senior notes in September  and November
of 1998. The balance of the Company equity  contribution was funded from cash on
hand and from the proceeds of the Company's recently completed sales of at least
50% of its interest in all of its qualifying  facility projects,  including 100%
of Coso Finance  Partners (Navy I), Coso Energy  Developers (BLM) and Coso Power
Developers  (Navy  II)  (collectively  the  "Coso  Partnerships")  and 50% of CE
Generation LLC ("CE Generation").

     The following unaudited pro forma combined condensed  financial  statements
are based on the historical consolidated financial statements of the Company and
MHC,  combined  and  adjusted to give effect to the Merger and the  transactions
contemplated thereby (including the related financing and the sale of qualifying
facility  project  interests,  excluding the gain on the sale of the  qualifying
facility project interests from the pro forma income statement), as described in
the notes  thereto.  An after-tax  gain of $12.4  million,  or $0.17 per diluted
share, on the sale of the qualifying  facility project interests was reported in
the first quarter of 1999. Certain amounts in the MHC financial  statements have
been  reclassified to conform to the Company's  presentation.  These  statements
should be read in conjunction with the historical financial statements and notes
thereto.

     The unaudited pro forma  combined  condensed  statement of earnings for the
year ended  December 31, 1998 presents the results for the Company and MHC as if
the Merger had occurred at the beginning of the year. The accompanying unaudited
pro forma combined  condensed balance sheet as December 31, 1998 gives effect to
the Merger as of that date.

     The pro forma adjustments are based upon preliminary estimates, information
currently  available,  and certain  assumptions  that  management  believes  are
reasonable under the circumstances.  The Company's actual consolidated financial
statements will reflect the effects of the Merger on and after the completion of
the Merger  rather  than the dates  indicated  above.  The  unaudited  pro forma
combined  condensed  financial  statements neither purport to represent what the
combined results of operations or financial  condition  actually would have been
had the Merger and related  transactions  in fact occurred on the assumed dates,
nor to project the combined results of operations and financial position for any
future period.

     The Merger will be  accounted  for by the purchase  method and,  therefore,
assets and liabilities of MHC will be recorded at their fair values.  The excess
of the  purchase  cost  over  the  fair  value  of net  assets  acquired  at the
completion of the Merger will be recorded as goodwill.  Allocations  included in
the pro forma  statements  are  based on  analysis  which is not yet  completed.
Accordingly,  the  final  value of the  purchase  price and its  allocation  may
differ,  perhaps  significantly,  from the  amounts  included in these pro forma
statements.

                                      -1-


         PRO FORMA UNAUDITED COMBINED CONDENSED STATEMENT OF OPERATIONS
                      FOR THE YEAR ENDED DECEMBER 31, 1998
                      (IN THOUSANDS, EXPECT PER SHARE DATA)




                                                 DEBT OFFERINGS
                                                 AND RETIREMENTS   QF SALES                           MERGER          
                                     COMPANY      (NOTES 1 &2)     (NOTE 3)            MHC         (NOTES 4 & 5)     PRO FORMA
                                   ----------    ---------------   ---------       -----------     -------------    -----------

                                                                                                  
Revenue:                         
Operating Revenue ..............   $2,555,206     $        -       $(531,461)      $ 1,940,150       $      -       $ 3,963,895
Interest and other income ......      127,505              -           5,192            36,189              -           168,886
                                   ----------     ----------       ---------       -----------       --------       -----------

     Total revenues ............    2,682,711              -        (526,269)        1,976,339              -         4,132,781
                                   ----------     ----------       ---------       -----------       --------       -----------
Cost and expenses:
Cost of Sales ..................    1,258,539              -               -           705,948        (11,599) A      1,952,888
Operating expense ..............      425,004              -        (146,980)          771,775         (3,035) A      1,046,764
General and administration .....       46,401              -          (4,963)                -              -            41,438
Depreciation and amortization ..      333,422              -        (116,189)          182,211         33,264  A,B      432,708
Interest expense ...............      406,084         60,027         (64,401)           95,519              -           497,229
Less interest capitalized ......      (58,792)             -             347            (3,377)             -           (61,822)
                                   ----------     ----------       ---------       -----------       --------       -----------
     Total costs and expenses ..    2,410,658         60,027        (332,186)        1,752,076         18,630         3,909,205
                                   ----------     ----------       ---------       -----------       --------       -----------

Income before income taxes .....      272,053        (60,027)       (194,082)          224,263        (18,630)          223,577

Provision for income taxes .....       93,265        (24,311)        (85,847)           80,013          5,850  C         68,971
                                   ----------     ----------       ---------       -----------       --------       -----------

Income before minority interest       178,788        (35,716)       (108,236)          144,250        (24,480)          154,606
Minority interest ..............       41,276              -               -            12,932              -            54,208
                                   ----------     ----------       ---------       -----------       --------       -----------

Income before extraordinary item   $  137,512     $  (35,716)      $(108,236)      $   131,318       $(24,480)      $   100,398
                                   ==========     ==========       =========       ===========       ========       ===========

 Net Income per share - basic ..         2.29                                                                              1.67

 Net Income per share - diluted          2.15                                                                              1.63

Basic shares  outstanding ......       60,139                                                                            60,139

Diluted shares outstanding .....       74,100                                                          (5,654) D         68,446


                                      -2-



              PRO FORMA UNAUDITED COMBINED CONDENSED BALANCE SHEET
                                DECEMBER 31, 1998
                                 (IN THOUSANDS)


                                                 
                                                        
                                                    DEBT OFFERINGS                      
                                                    AND RETIREMENTS    QF SALES                        MERGER 
                                       COMPANY        (NOTES 1 &2)     (NOTE 3)          MHC          (NOTE 4)          PRO FORMA
                                      ----------    ---------------  ------------    -----------     -----------       -----------
                                                                                                             
Cash and Investments ...............  $1,606,148      $  56,623      $   816,042      $    9,221     $(2,424,779)      $    63,255
Restricted cash & Investments ......     637,571              -         (132,183)              -               -           505,388
Marketable securities ..............           -              -                -         398,554               -           398,554
Accounts receivable ................     528,116              -          (89,486)        211,241               -           649,871
Properties, plants, contracts
  and equipment, net ...............   4,236,039              -       (1,174,518)      2,791,433         (34,295)        5,818,659
Excess of cost over fair value of
  net assets acquired, net .........   1,538,176              -         (310,700)              -       1,345,238         2,572,714
Equity investments .................     125,036              -           43,438               -               -           168,474
Deferred charges and other assets ..     432,438          4,581          (63,681)        923,484         (71,485)        1,225,337
                                      ----------      ---------      -----------      ----------     -----------       -----------

     Total assets ..................  $9,103,524      $  61,204      $  (911,089)     $4,333,933     $(1,185,321)      $11,402,252
                                      ==========      =========      ===========      ==========     ===========       ===========


Liabilities and Stockholders' Equity

Liabilities:
Accounts payable ...................  $  305,757      $       -      $   (39,945)     $  172,779     $         -       $   438,591
Other accrued liabilities ..........   1,009,091        (17,432)          (7,562)        598,226          75,802         1,658,125
Parent Company Debt ................   2,645,991       (569,501)               -               -               -         2,076,490
Subsidiary and Project Debt ........   3,093,810        700,000         (692,210)      1,446,888           4,076         4,552,564
Deferred income taxes ..............     543,391        (20,486)        (194,233)        733,331         (65,955)          996,048
                                      ----------      ---------      -----------      ----------     -----------       -----------
Total liabilities ..................   7,598,040         92,581         (933,950)      2,951,224          13,923         9,721,818
                                      ----------      ---------      -----------      ----------     -----------

Deferred income ....................      58,468              -                -               -               -            58,468
                                      ----------      ---------      -----------      ----------     -----------       -----------
Convertible preferred securities
  of subsidiary ....................     553,930              -                -               -               -           553,930
Preferred stock of subsidiary ......      66,033              -                -         181,759           1,706           249,498
                                      ----------      ---------      -----------      ----------     -----------       -----------

Stockholders' Equity:
Common Stock .......................       5,602              -                -               -               -             5,602
Additional paid in capital .........   1,233,088              -                -       1,200,950      (1,200,950)        1,233,088
Retained earnings ..................     340,496        (31,377)          22,861               -               -           331,980
Treasury Stock .....................    (752,178)             -                -               -               -          (752,178)
Cumulative effect of foreign
  currency translation adjust ......          45              -                -               -               -                45
                                      ----------      ---------      -----------      ----------     -----------       -----------
Total Stockholders' Equity .........     827,053        (31,377)          22,861       1,200,950      (1,200,950)          818,537
                                      ----------      ---------      -----------      ----------     -----------       -----------

Total liabilities and
  stockholders' equity .............  $9,103,524      $  61,204      $  (911,089)     $4,333,933     $(1,185,321)      $11,402,252
                                      ==========      =========      ===========      ==========     ===========       ===========


                                      -3-



         NOTES TO UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL DATA

The  Unaudited  Pro Forma  Combined  Condensed  Financial  Data are based on the
following assumptions:

1.  Issuance of $700  million  notes of a  subsidiary,  net of $4.5 million debt
    issue costs,  with a weighted  average  interest  rate of 6.5%.  Issuance of
    $1,400 million senior notes and bonds of the Company with a weighted average
    interest rate of 7.26%. Issuance of $100 million 7.52% senior notes.

2.  Retirement of the $529.6  million,  10.25% Senior  Discount  Notes, of which
    $160.1  million was retired in the fourth quarter of 1998 and $369.5 million
    was retired in January 1999, and $195.8  million of 9.875% Limited  Recourse
    Notes.  The 1999  retirements  included  call  premiums of $38.6 million and
    write-off of deferred financing costs of $13.3 million.

3.  The sale of Coso for cash  proceeds  of $205  million  and the sale of a 50%
    interest  in  CE  Generation  for  cash  proceeds  of  $447  million,   less
    transaction  costs of $10 million and  including  $400  million  from the of
    proceeds  of  the  7.42%  Senior  Secured  Bonds  issued  by  CE  Generation
    (collectively the "QF Sales").  The pro forma income statement  excludes the
    gain on the sale of the qualifying facility project interests.  An after tax
    gain of  $12.4  million,  or $0.17  per  diluted  share,  on the sale of the
    qualifying  facility project  interests was reported in the first quarter of
    1999.

4.   The use of the net  proceeds  detailed  above to purchase  MHC for $2,439.8
     million,  including  accrued  transaction  costs of $15 million recorded in
     other liabilities.  The preliminary adjustments which have been made to the
     assets and liabilities of MHC to reflect the effect of the Merger accounted
     for as a purchase business combination follow (in thousands):

          Goodwill                                   $1,345,238
          Power purchase contract                       (34,295)
          Other assets                                  (71,485)
          Other liabilities                             (60,802)
          Long-term debt                                 (4,076)
          Deferred taxes                                 65,955
          Preferred securities of subsidiaries           (1,706)
                                                     ----------
                                                     $1,238,829
                                                     ==========

     Included in other  assets is primarily  an  adjustment  to reflect the fair
     value of MHC's investment in real estate. Included in other liabilities are
     primarily  adjustments  to reflect MHC's  compensation  obligations  and to
     reflect  MHC's  long-term  contracts  at fair value based on the  estimated
     market prices for similar purchases with similar remaining maturities.

5.  A.   Record amortization of the purchase price accounting adjustments using
         the straight line or other applicable method over their remaining 
         estimated lines.

    B.   Record  amortization  of the excess  purchase price over the net assets
         acquired using the straight line method over 40 years.

    C.   Includes   income  tax  expense  for  the  effects  of  the  pro  forma
         adjustments which affect taxable income at an effective rate of 40.5%.

    D.   Earnings per share-diluted is further adjusted for certain  convertible
         securities which are antidilutive on a pro forma basis.

                                      -4-