SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                                    FORM 11-K/A

     /X/  Annual report pursuant to Section 15(d) of the Securities and Exchange
          Act of 1934 For the fiscal year ended December 31, 2000.

     / /  Transition report pursuant to Section 15(d) of the Securities
          Exchange Act of 1934 for the transition period from        to

          Commission file number: 1-3122

     A.   Full title of the plan and the address of the plan, if different from
          that if the issuer named below:

                          Resource Recovery 401(k) Plan

     B.   Name of the issuer of the securities held pursuant to the plan and the
          address of its principal executive office:

                           Covanta Energy Corporation
                                  40 Lane Road
                               Fairfield, NJ 07007





                                    Signature

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the trustees (or other persons who administer the Resources Recovery 401(k)
Plan) have duly caused this annual report to be signed by the undersigned
thereunto duly authorized.

                                            Resource Recovery 401(k) Plan
                                            Administrative Committee

                                            By: /s/ Louis M. Walters
                                               -------------------------
                                            Louis M. Walters
                                            Member of the Resource Recovery
                                            401(k) Plan Administrative Committee

Date : July 2, 2001





    Resource Recovery
    401(k) Plan

    Independent Auditors' Report

    Financial Statements

    Years Ended December 31, 2000 and 1999
    Supplemental Schedule
    Year Ended December 31, 2000







RESOURCE RECOVERY 401(k) PLAN

TABLE OF CONTENTS

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




INDEPENDENT AUDITORS' REPORT

FINANCIAL STATEMENTS FOR THE YEARS ENDED
   DECEMBER 31, 2000 AND 1999:

   Statements of Net Assets Available for Benefits

   Statements of Changes in Net Assets Available for Benefits

   Notes to Financial Statements


SUPPLEMENTAL SCHEDULE FOR THE
   YEAR ENDED DECEMBER 31, 2000:

   Schedule of Assets Held for Investment Purposes at End of Year







INDEPENDENT AUDITORS' REPORT

Resource Recovery 401(k) Plan

We have audited the accompanying statements of net assets available for benefits
of the Resource Recovery 401(k) Plan (the "Plan") as of December 31, 2000 and
1999, and the related statements of changes in net assets available for benefits
for the years then ended. These financial statements are the responsibility of
the Plan's management. Our responsibility is to express an opinion on these
financial statements based on our audits.

We conducted our audits in accordance with auditing standards generally accepted
in the United States of America. Those standards require that we plan and
perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements. An audit also includes assessing the accounting principles used and
significant estimates made by management, as well as evaluating the overall
financial statement presentation. We believe that our audits provide a
reasonable basis for our opinion.

In our opinion, such financial statements present fairly, in all material
respects, the net assets available for benefits of the Plan at December 31, 2000
and 1999, and the changes in net assets available for benefits for the years
then ended in conformity with accounting principles generally accepted in the
United States of America.

Our audits were conducted for the purpose of forming an opinion on the basic
financial statements taken as a whole. The supplemental schedule listed in the
Table of Contents is presented for the purpose of additional analysis and is not
a required part of the basic financial statements, but is supplementary
information required by the Department of Labor's Rules and Regulations for
Reporting and Disclosure under the Employee Retirement Income Security Act of
1974. This schedule is the responsibility of the Plan's management. Such
schedule has been subjected to the auditing procedures applied in our audit of
the basic 2000 financial statements and, in our opinion, is fairly stated in all
material respects when considered in relation to the basic financial statements
taken as a whole.

/s/ DELOITTE & TOUCHE LLP

Parsippany, New Jersey
June 15, 2001




RESOURCE RECOVERY 401(k) PLAN

STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS
DECEMBER 31, 2000 AND 1999
- --------------------------------------------------------------------------------


                                             2000            1999
     ASSETS -


       Investments (See Note 3)          $48,363,668   $46,940,538
                                         -----------   -----------

     RECEIVABLES:

       Employer contributions                 80,252       138,944
       Participant contributions             194,478       324,349
                                         -----------   -----------

                Total receivables            274,730       463,293
                                         -----------   -----------

     NET ASSETS AVAILABLE FOR BENEFITS   $48,638,398   $47,403,831
                                         ===========   ===========


See notes to financial statements.




RESOURCE RECOVERY 401(k) PLAN

STATEMENTS OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS
YEARS ENDED DECEMBER 31, 2000 AND 1999
- --------------------------------------------------------------------------------




                                                                 2000               1999
                                                                       
     ADDITIONS:

       Additions to net assets attributed to:
         Investment Income:
           Net (depreciation) appreciation in fair value of
             investments (See Note 3)                         $ (3,295,444)   $  3,401,755
           Interest and dividends                                2,063,823       1,096,089
                                                              ------------    ------------

                                                                (1,231,621)      4,497,844
                                                              ------------    ------------

       Contributions:
         Participant                                             3,806,494       3,602,836
         Employer                                                1,512,821       1,604,636
         Rollovers                                                    --            52,122
                                                              ------------    ------------

                                                                 5,319,315       5,259,594
         Net transfer from other plans                                --        39,395,641
                                                              ------------    ------------

               Total additions                                   4,087,694      49,153,079
                                                              ------------    ------------

     DEDUCTIONS -

       Deductions from net assets attributed to:
         Administrative expenses                                   (30,470)        (14,997)
         Distributions to participants                          (2,822,657)     (1,734,251)
                                                              ------------    ------------

                Total deductions                                (2,853,127)     (1,749,248)
                                                              ------------    ------------

     NET INCREASE IN NET ASSETS AVAILABLE FOR BENEFITS           1,234,567      47,403,831

     NET ASSETS AVAILABLE FOR BENEFITS,
       BEGINNING OF YEAR                                        47,403,831            --
                                                              ------------    ------------

     NET ASSETS AVAILABLE FOR BENEFITS, END OF YEAR           $ 48,638,398    $ 47,403,831
                                                              ============    ============



See notes to financial statements.






RESOURCE RECOVERY 401(k) PLAN

NOTES TO FINANCIAL STATEMENTS
YEARS ENDED DECEMBER 31, 2000 AND 1999

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


1.   DESCRIPTION OF THE PLAN

     The following is a description of the Resource Recovery 401(k) Plan (the
     "Plan"). Participants should refer to the Plan document for more complete
     information.

     a.   General Information - The Plan is a defined contribution employee
          savings plan providing for both employer and employee contributions.
          Prior to adoption of the Plan on January 1, 1999, Covanta Energy
          Services, Inc. (the"Company", formerly Ogden Resource Recovery Support
          Services, Inc.) was included in the Ogden 401(k) Plan (the "Prior
          Plan"). It was determined that it was in the best interest of the
          Company and its employees to adopt the Plan, such plan being
          substantially similar to, and a continuation of the Prior Plan.
          Accordingly, effective January 1, 1999 the Prior Plan assets
          pertaining to the Company were transferred to the Plan. All service
          credited to an individual as a participant under the Prior Plan was
          credited to such individual under the Plan; provided, that such
          individual became a Participant of the Plan on or after January 1,
          1999. The Plan is subject to the provisions of the Employee Retirement
          Income Security Act of 1974.

          Effective February 1, 2000, all of the assets and outstanding loans of
          the Plan were transferred from American Express Trust Company (the
          "Prior Trustee") to T. Rowe Price Trust Company (the "Trustee"). The
          sponsor of the Plan, the Company, determined that it would be in the
          best interest of the Company and the Plan, for the assets and
          outstanding loans to be held by a separate trustee from the Prior
          Trustee.

     b.   Administration of the Plan - Administrative and Investment Committees
          are appointed by the Board of Directors (the "Board") of Covanta
          Energy Group, Inc.(formerly Ogden Energy Group, Inc.) and serve
          as fiduciaries of the Plan. The Administrative Committee has
          responsibility for administering the Plan, and the Investment
          Committee has responsibility for reviewing the performance of the
          Plan's investments. Costs related to the administration of the Plan
          may be paid out of Plan assets if the Company does not pay such
          expenses directly.

     c.   Participation - Full-time employees who are not hourly employees of
          participating companies who are not covered under a collective
          bargaining agreement with a recognized union and have attained age 21
          are eligible to participate in the Plan on the first day of the
          calendar month following the date he or she has completed 12 months of
          employment and 1,000 hours of service.

     d.   Contributions - Participants may elect to contribute to the Plan from
          one to fifteen percent of their annual compensation on a pre-tax
          basis. For 2000 and 1999, participant pre-tax contribution could not
          exceed $10,500 and $10,000, respectively, in accordance with Internal
          Revenue Service ("IRS") Regulations. The Company matches 100 percent
          up to the first 3 percent of a participant's annual compensation which
          is invested based on participant investment elections.

          A participant's elective contributions and Company contributions are
          invested, at the direction of the participant, in accordance with one
          of the following options:

          o    100 percent in one of the Investment Funds; or

          o    in more than one Investment Fund allocated in multiples of 1
               percent.

          If a participant does not make such an election, he or she is deemed
          to have elected investment in the Government Securities Fund.

     e.   Loans to Participants - Loans are made to participants at a minimum of
          $500 and up to the lesser of 50 percent of the participant's total
          vested account balance (including outstanding loans, if any,) minus
          the current loan balance or $50,000 reduced by the highest outstanding
          balance of loans during the preceding 12 months, even if repaid, not
          to exceed the limitations of the Tax Reform Act of 1986. The terms of
          the loans are a minimum of 6 months and a maximum of 5 years or 60
          months (10 year maximum on loans for a primary residence).
          Participants are prohibited from borrowing funds accumulated in the
          Ogden Stock Fund. The maximum number of loans outstanding at one time
          for an employee is two loans with only one of the outstanding loans
          being a residential loan. The loan interest rate is based on the prime
          rate plus 1% on the first business day of each month.

     f.   Vesting - Vesting of employer contributions to the Plan is determined
          based on the period of vesting service by participants commencing on
          their date of hire to their date of termination of service in
          accordance with the following schedule:

                                                              Percent
              Years of Vesting Service in the Plan             Vested

          Less Than one year of vesting service                  0%
          One but less than two years of vesting service        20
          Two but less than three years of vesting service      40
          Three but less than four years of vesting service     60
          Four but less than five years of vesting service      80
          Five or more years of vesting service                100

          Participant contributions are immediately 100% vested.

     g.   Retirement Dates - A participant's normal retirement date is the
          participant's sixty-fifth birthday. A participant may elect early
          retirement at age 55 with 5 years of credited service.

     h.   Form of Benefits - A participant can receive payout through one of the
          following options: lump sum cash distribution, direct rollover into
          another qualified retirement plan or IRA, or transfer in-kind
          distribution.

2.   SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     The accounting and reporting policies followed in the preparation of the
     financial statements of the Plan are in conformity with accounting
     principles generally accepted in the United States of America. The
     following is a description of the more significant of these policies:

     a.   Investment Funds - During 2000, the Plan included the following funds
          in which participants could elect to invest their Plan assets.

          o    T. Rowe Price Equity Income Fund - This fund invests in stocks
               that pay above-average dividends.

          o    T. Rowe Price Stable Value Fund ("Stable Value Fund") - This fund
               invests in investment contracts issued by high-quality insurance
               companies and banks.

          o    T. Rowe Price U. S. Treasury Money Fund ("U. S. Treasury Money
               Fund") - This fund invests primarily in short-term U. S. Treasury
               securities.

          o    Fidelity Magellan Fund - This fund invests in common stock of
               domestic, foreign and multinational companies of all sizes. The
               fund may also invest in bonds.

          o    T. Rowe Price International Stock Fund - This fund invests in
               established non-U.S. companies.

          o    T. Rowe Price Balanced Fund - This fund invests approximately 60%
               in stocks and 40% in bonds.

          o    T. Rowe Price Spectrum Income Fund - This fund invests in five U.
               S. bond funds, two international bond funds, a money market fund
               and an income-oriented stock fund.

          o    T. Rowe Price Blue Chip Growth Fund - This fund invests in large
               and medium-sized blue chip growth companies.

          o    T. Rowe Price Equity Index 500 Fund - This fund invests in the
               500 stocks that make up the S&P 500 Index.

          o    T. Rowe Price Small-Cap Value Fund - This fund invests in small
               companies that appear to be undervalued.

          o    T. Rowe Price New Horizons Fund - This aggressive fund seeks high
               long-term growth. It invests in small-company stocks and takes a
               growth approach to investing. This fund is subject to the abrupt
               and unpredictable market movements associated with small-company
               stocks.

          o    Ogden Stock Fund - This fund invests in Covanta Energy
               Corporation ("Covanta", formerly Ogden Corporation) common stock,
               traded on the New York Stock Exchange.

          o    T. Rowe Price Mid-Cap Growth Fund - This fund invests at least
               65% of its assets in a diversified portfolio of common stocks of
               mid-cap companies whose earnings T. Rowe Price expects to grow at
               a faster rate than the average company.

          o    T. Rowe Price Science & Technology Fund - This fund invests at
               least 65% of its assets in the common stocks of companies
               expected to benefit from the development, advancement and use of
               science and technology.

          Shares in group trust funds were determined on the basis of the
          initial asset contribution to the trust by each participating plan,
          adjusted for subsequent contributions, distributions and allocated
          income and realized and unrealized gains and losses. Allocation of
          income, realized and unrealized gains and losses and administrative
          expenses were determined monthly on the basis of each plan's
          proportionate share in the Plan assets stated at fair value.

     b.   Investment Funds - During 1999, the Plan included the following funds
          in which participants could elect to invest their Plan assets:

          o    Ogden Stock Fund ("Stock Fund") - Investments in common stock of
               Covanta, but does maintain a small cash balance
               invested in a money market fund for liquidity purposes.

          o    Fiduciary Capital Management Fixed Income Fund ("Fixed Income
               Fund") - Investment contracts with insurance companies and banks
               which provide for a guaranteed return on principal invested over
               a specified time period.

          o    American Express Equity Index Fund II ("AMEX Equity Fund") -
               Investments in a collective trust consisting of a diversified
               portfolio of equity securities.

          o    AXP Mutual Fund Balanced Portfolio ("AXP Mutual Fund") -
               Investments in a mutual fund consisting primarily of common
               stock, preferred stock and debt securities.

          o    Templeton Foreign Fund ("Templeton Fund") - Investments in a
               mutual fund consisting primarily of established, non-U.S.
               companies.

          o    AXP Growth Fund ("AXP Growth Fund") - Investments in a mutual
               fund seeking to provide long-term growth of capital primarily in
               growth, improving, and technology companies.

          o    AXP New Dimensions Fund ("AXP Dimensions Fund") - Investments in
               a mutual fund which invests primarily in common stocks of U.S.
               and foreign companies in which economic and technical changes may
               take place.

          o    AET U.S. Government Securities Fund II ("Government Securities
               Fund") - Investments in a collective money market fund, managed
               to provide maximum current income consistent with conserving
               capital and maintaining high liquidity.

     c.   Investment Valuation - Investments in securities listed on national
          securities exchanges are valued at closing composite prices published
          for the last business day of the year. Investments in guaranteed
          investment contracts included in the Stable Value Fund are stated at
          fair value which approximates contract value. Investments in the U. S.
          Treasury Money Fund is stated at cost plus investment income which
          approximates fair value. Other investments are stated at fair value as
          determined by the Trustee.

     d.   Investment Transactions and Investment Income - Investment
          transactions are accounted for on the date purchases or sales are
          executed. Realized and unrealized gains and losses are determined
          based on the fair value of assets at the beginning of the Plan year.
          Dividend income is accounted for on the ex-dividend date. Interest
          income is recorded on the accrual basis as earned.

     e.   United States Federal Income Taxes - The Plan and trust are intended
          to be qualified under Section 401(a) and tax-exempt under Section
          501(a) of the Internal Revenue Code (the "Code"), respectively. The
          Plan Administrator believes that the Plan is currently designed and
          being operated in compliance with the applicable requirements of the
          Code. Therefore, no provision for income taxes has been included in
          the Plan's financial statements.

     f.   Distributions to Participants - Benefits are recorded when paid.

     g.   General - The financial statements are prepared in conformity with
          accounting principles generally accepted in the United States of
          America. These principles require management to make certain estimates
          and assumptions that affect the reported amounts of assets and
          liabilities at the date of the financial statements, and the reported
          amounts of changes in net assets available for benefits during the
          reporting period. Actual results could differ from those estimates.

     h.   Accounting for Derivative Instruments - The Financial Accounting
          Standards Board issued Statement of Financial Accounting Standards
          ("SFAS") No. 133, Accounting for Derivative Instruments and Hedging
          Activities. SFAS No. 133, as amended and interpreted, established
          accounting and reporting standards for derivative instruments,
          including certain derivative instruments embedded in other contracts,
          and hedging activities. It requires entities, including employee
          benefit plans, to recognize all derivatives as either assets or
          liabilities in the statement of financial position and to measure
          those instruments at fair value.


          This Statement is effective for fiscal years after June 15, 2000.
          Management has determined that the implementation of SFAS No. 133 will
          have no effect on the Plan's financial statements.

3.   INVESTMENTS

     The following is a summary of the Plan's investments held by the Trustee at
     December 31, 2000 that represent 5 percent or more of the Plan's net
     assets:


    Investments at fair value determined by quoted market price:

      Ogden Stock Fund                                               $ 5,440,134
      Stable Value Fund                                                5,688,474
      Fidelity Magellan Fund                                           9,837,890
      T. Rowe Price Balanced Fund                                      3,170,106
      T. Rowe Price Blue Chip Growth Fund                              2,756,836
      T. Rowe Price Equity Index 500 Fund                              9,596,725
      T. Rowe Price Spectrum Income Fund                               2,420,617
      Investments at estimated fair value by the Trustee - Loan Fund   3,901,875


     The Stable Value Fund primarily invests in investment contracts providing a
     guaranteed return on principal invested over a specified time period. The
     crediting interest rates at December 31, 2000 for the various investment
     contracts ranged from 5.88% to 7.83%. The average yields of the Stable
     Value Fund for the year ended December 31, 2000 was 6.58%. All investment
     contracts in the Stable Value Fund are fully benefit-responsive and are
     recorded at their fair values. Generally, fair value approximates contract
     value contributions made plus interest accrued at the contract rates less
     withdrawals and fees. If, however, an event has occurred that may impair
     the ability of the contract issuer to perform in accordance with the
     contract terms, fair value may be less than the contract value.

     During 2000, the Plan's investments (including gains and losses on
     investments bought and sold as well as held during the year) depreciated in
     value by $3,295,444 as follows:


                                                                       2000

     Fidelity Magellan Fund                                         $(1,105,005)
     T. Rowe Price International Stock Fund                            (476,736)
     T. Rowe Price Equity Income Fund                                       802
     Ogden Stock Fund                                                   108,645
     T. Rowe Price Balanced Fund                                        (10,954)
     T. Rowe Price New Horizons Fund                                   (285,885)
     T. Rowe Price Spectrum Income Fund                                  53,765
     T. Rowe Price Blue Chip Growth Fund                               (211,384)
     T. Rowe Price Equity Index 500 Fund                               (670,437)
     T. Rowe Price Small-Cap Value Fund                                  (3,731)
     T. Rowe Price Science & Technology Fund                           (780,118)
     T. Rowe Price Mid-Cap Growth Fund                                  (23,427)
     American Express Income Fund II (formerly Fixed Income Fund        109,021
                                                                     -----------

                                                                    $(3,295,444)
                                                                    ===========


     The following is a summary of the Plan's investments held by the Former
     Trustee at December 31, 1999 that represent 5 percent or more of the Plan's
     net assets.


     Investments at fair value as determined by quoted market price:
       Stock Fund                                                   $ 3,447,877
       AXP Growth Fund                                               11,726,578
       AMEX Equity Fund                                              11,316,493
       AXP Mutual Fund                                                3,226,609
       Templeton Fund                                                 2,507,349
       Government Securities Fund                                     2,689,523
     Investments at contract value as determined by
       the Trustee - Fixed Income Fund                                6,781,103
     Investments at estimated fair value as determined by
       the Trustee -Loan Fund                                         3,391,894


     Loans to participants at December 31, 2000 and 1999, which comprise the
     Loan Fund, are reported at cost, which approximates fair value.

     The Fixed Income Fund invests in investment contracts providing a
     guaranteed return on principal invested over a specified time period. The
     crediting interest rates at December 31, 1999 for the various investment
     contracts ranged from 7.74% to 4.82%. The average yields of the Fixed
     Income Fund for the year ended December 31, 1999 was 6.91%. All investment
     contracts in the Fixed Income Fund are fully benefit-responsive and are
     recorded at contract value which equals principal plus accrued interest. If
     the investment contracts were reported at fair value, the investment
     contracts in the Fixed Income Fund would have approximated $1,784,491 at
     December 31, 1999.

4.   PLAN TERMINATION

     The Company expects to continue the Plan indefinitely, but reserves the
     right to modify, suspend, or terminate the Plan at any time, which includes
     the right to vary the amount of, or to terminate, the Company's
     contributions to the Plan. In no event shall assets of the Plan be used for
     any purpose other than to benefit participants or beneficiaries. In the
     event of the Plan's termination or discontinuance of contributions
     thereunder, the interest of each participant to benefits accrued to such
     date, to the extent then funded, is fully vested and nonforfeitable.

5.   TAX STATUS

     The Plan has not yet received a favorable IRS determination letter;
     however, the Plan Administrator is in the process of submitting an
     application requesting confirmation that the Plan and related trust are
     designed in accordance with applicable sections of the Code. The Plan
     Administrator believes that the plan is currently being operated in
     compliance with the applicable requirements of the Code. Therefore, no
     provision for income taxes has been included in the Plan's financial
     statments.

                                     ******



RESOURCE RECOVERY 401(k) PLAN

SCHEDULE OF ASSETS HELD FOR INVESTMENT PURPOSES AT END OF YEAR
DECEMBER 31, 2000
- --------------------------------------------------------------------------------




                                                Description               Number of            Market
      Identity of Issue                        of Investment            Share / Units          Value
                                                                                         
MUTUAL FUNDS:
  T. Rowe Price Equity
    Income Fund                                Mutual Fund                      4,159          $ 102,607
  T. Rowe Price
    Stable Value Fund                          GIC                          5,688,474          5,688,474
  T. Rowe Price
    U.S. Treasury Money Fund                   Mutual Fund                    117,237            117,237
  Fidelity Magellan Fund                       Mutual Fund                     86,347          9,837,890
  T. Rowe Price
    International Stock Fund                   Mutual Fund                    145,634          2,114,604
  T. Rowe Price
    Balanced Fund                              Mutual Fund                    165,368          3,170,106
  T. Rowe Price
    Spectrum Income Fund                       Mutual Fund                    224,756          2,420,617
  T. Rowe Price
    Blue Chip Growth Fund                      Mutual Fund                     81,443          2,756,836
  T. Rowe Price
    Equity Index 500 Fund                      Mutual Fund                    270,330          9,596,725
  T. Rowe Price
    Small Cap Value Fund                       Mutual Fund                     12,822            245,410
  T. Rowe Price
    New Horizons Fund                          Mutual Fund                     50,714          1,211,563
  T. Rowe Price
    Science & Technology Fund                  Mutual Fund                     40,825          1,452,150
  T. Rowe Price
    Mid-Cap Growth Fund                        Mutual Fund                      7,727            307,440

COMMON STOCKS:
  *Ogden Corporation                           Common Stock                   353,830          5,440,134

PARTICIPANT LOANS:
  Participant Loans                            Loans                          N/A             3,901,875
                                                                                            -----------

TOTAL ASSETS HELD FOR
  INVESTMENTS                                                                               $48,363,668
                                                                                            ===========


*Party-in-interest







INDEPENDENT AUDITORS' CONSENT

We consent to the incorporation by reference in Registration Statement Nos.
33-36658, 33-36657, 33-54143, 333-19641, 333-82801 and 333-40140 of Covanta
Energy Corporation (formerly Ogden Corporation) on Form S-8 of our report dated
June 15, 2001, appearing in this Annual Report on Form 11-K of the Resource
Recovery 401(k) Plan for the year ended December 31, 2000.

/s/  DELOITTE & TOUCHE LLP

Parsippany, New Jersey
June 27, 2001