SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


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


                                    FORM 11-K


                                  ANNUAL REPORT
                        PURSUANT TO SECTION 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


/x/   ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF
      1934.

      For the fiscal year ended December 31, 2001.

                                       OR

/ /   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
      of the issuer named below:

                             The Ogden 401(k) Plan


B.    Name of 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



    The Ogden 401(k) Plan

    Independent Auditors' Report

    Financial Statements
    As of December 31, 2001 and 2000
    and for the Year Ended December 31, 2001
    Supplemental Schedule
    December 31, 2001



THE OGDEN 401(k) PLAN

TABLE OF CONTENTS
- --------------------------------------------------------------------------------


                                                                           Page

INDEPENDENT AUDITORS' REPORT                                                 1

FINANCIAL STATEMENTS:

  Statements of Net Assets Available for Benefits as of
    December 31, 2001 and 2000                                               2

  Statement of Changes in Net Assets Available for Benefits
    for the Year Ended December 31, 2001                                     3

   Notes to Financial Statements                                            4-7

SUPPLEMENTAL SCHEDULE-

  Form 5500, Schedule H, Part IV, Line 4i - Schedule of Assets
    Held at End of Year as of December 31, 2001                               8



INDEPENDENT AUDITORS' REPORT


The Ogden 401(k) Plan

We have audited the accompanying statements of net assets available for benefits
of The Ogden 401(k) Plan (the "Plan") as of December 31, 2001 and 2000, and the
related statement of changes in net assets available for benefits for the year
ended December 31, 2001. 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 as of December 31,
2001 and 2000, and the changes in net assets available for benefits for the year
ended December 31, 2001 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 2001 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
July 10, 2002



THE OGDEN 401(k) PLAN

STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS
DECEMBER 31, 2001 AND 2000
- --------------------------------------------------------------------------------


                                                     2001                2000

ASSETS:
  Investments (Note 3)                              $ 51,135,230    $ 87,823,337
                                                    ------------    ------------

  Receivables:
    Employer contributions                                39,925         121,612
    Participant contributions                             36,035          65,051
                                                    ------------    ------------

           Total receivables                              75,960         186,663
                                                    ------------    ------------

NET ASSETS AVAILABLE FOR BENEFITS                   $ 51,211,190    $ 88,010,000
                                                    ============    ============


See notes to financial statements.



THE OGDEN 401(k) PLAN

STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS
YEAR ENDED DECEMBER 31, 2001
- --------------------------------------------------------------------------------



ADDITIONS:
  Additions to net assets attributed to-
    Interest and dividends                                         $ 506,190

  Contributions:
    Participant                                                    1,149,297
    Employer                                                         532,047
                                                                ------------

           Total additions                                         2,187,534
                                                                ------------

DEDUCTIONS:
  Deductions from net assets attributed to:
    Net depreciation in fair value of investments (Note 3)        (8,023,995)
    Benefits paid to participants                                (13,072,174)
    Administrative expenses                                          (80,459)
    Net transfer to other plans                                  (17,809,716)
                                                                ------------

           Total deductions                                      (38,986,344)
                                                                ------------

NET DECREASE IN NET ASSETS
  AVAILABLE FOR BENEFITS                                         (36,798,810)

NET ASSETS AVAILABLE FOR BENEFITS:
  BEGINNING OF YEAR                                               88,010,000
                                                                ------------

  END OF YEAR                                                   $ 51,211,190
                                                                ============


See notes to financial statements.



THE OGDEN 401(k) PLAN

NOTES TO FINANCIAL STATEMENTS
YEARS ENDED DECEMBER 31, 2001 AND 2000
- --------------------------------------------------------------------------------


1.   DESCRIPTION OF THE PLAN

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

     a.  General  Information - Ogden Services  Corporation (the "Company"),  a
         wholly owned subsidiary of Covanta Energy  Corporation  ("Covanta") is
         the Plan's sponsor. The Plan is an employee savings plan providing for
         both employer and participants  contributions.  The Plan is subject to
         the provisions of the Employee  Retirement Income Security Act of 1974
         ("ERISA").

         The Plan was established as the Ogden Food Service Corporation Savings
         and Security Plan by Ogden Food Service Corporation on January 1, 1982.
         Effective January 1, 1996, the Company changed the Plan's name from the
         Ogden Profit Sharing Plan to The Ogden 401(k) Plan. The Plan was
         amended and restated effective January 1, 1991 to conform with the Tax
         Reform Act of 1986.

         Effective January 1, 1999, the Plan was amended as a result of several
         administrative and plan design changes. The Company determined that it
         would be in the best interest of Ogden Resource Recovery Support
         Services, Inc. and ADT Global Services, Inc. (collectively, "Prior
         Participating Companies"), and their employees, to establish separate
         defined contribution plans. Effective January 1, 1999, the Plan assets
         of the Prior Participating Companies were transferred from the Plan to
         the Resource Recovery 401(k) Plan and ADT Global Services 401(k) Plan,
         respectively.

         On various dates in 2001, the Company sold certain subsidiaries. Some
         of the participants in the Plan were employees who became participants
         of other plans sponsored by these subsidiaries. Amounts transferred to
         these unrelated Plans amounted to $17,809,716.

         Covanta has announced a financial restructuring plan resulting from its
         comprehensive review of strategic alternatives. As the first element of
         that plan, on April 1, 2002, Covanta and 123 of its domestic
         subsidiaries (the "Debtors"), which include the Company, filed
         voluntary petitions for reorganization under Chapter 11 of the United
         States Bankruptcy Code (the "Bankruptcy Code") with the United States
         Bankruptcy Court for the Southern District of New York (the "Bankruptcy
         Court"). The Debtors are currently operating their businesses as
         debtors in possession pursuant to the Bankruptcy Code. The Debtors'
         dependence upon, among other things, confirmation of a plan of
         reorganization, their ability to comply with the terms of their debtor
         in possession financing facility, and their ability to generate
         sufficient cash flows from operations, asset sales and financing
         arrangements to meet their obligations, raise substantial doubt about
         their ability to continue as going concerns. The Debtors' debtor in
         possession financing facility includes provisions enabling Covanta and
         its subsidiaries, including the Company, to obtain funding for making
         employer matching contributions to the Plan (see Note 1 (d)).

         As a result of publicly disclosed information concerning Covanta and
         uncertainty of future rules and regulations which may apply to the
         Plan's investment in Covanta's common stock, the Investment Committee
         determined that it was in the best interest of the Plan and its
         participants to discontinue the Covanta Stock Fund as an investment
         option under the Plan effective March 18, 2002. Additionally, the Plan
         was amended to discontinue the Company matching contributions in the
         form of Covanta common stock and to allow Plan participants to maintain
         their investment in the Covanta Stock Fund or, at their discretion,
         redirect their investment to another investment fund offered under the
         Plan. On May 16, 2002, the Securities and Exchange Commission granted
         the application of the New York Stock Exchange, Inc. (the "NYSE") for
         removal of Covanta's common stock from listing and registration on the
         NYSE. The removal of such stock became effective at the opening of the
         trading session on May 17, 2002.

     b.  Administration of the Plan - Administrative and Investment Committees
         are appointed by the Board of Directors (the "Board") of the Company
         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 and part-time 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 twelve 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.
         The maximum annual compensation that can be applied to the 401(k)
         deferral for 2001 is $170,000. For 2001, participant pre-tax
         contributions could each not exceed $10,500 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 that is
         invested based on participant investment elections. On January 1, 1999,
         the Company implemented an additional company match of 50 percent up to
         the next 2 percent of a participant's annual compensation in Covanta
         common stock for participants who are eligible and who elect to
         contribute.

         A participant's  elective  contributions and Company contributions and
         discretionary  profit  sharing   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 vested balance or
         $50,000, less the highest of any outstanding loan balance in the
         previous 12 months, even if repaid. Loans cannot exceed the limitations
         of the Tax Reform Act of 1986. The terms of the loans are a minimum of
         one year and a maximum of five years or sixty months (ten year maximum
         on loans for a primary residence). Participants were prohibited from
         borrowing funds accumulated in the Covanta Stock Fund (see Note 8). The
         maximum number of loans outstanding at one time for an employee is two.
         The interest rate charged is The Wall Street Journal's prime rate plus
         1 percent. Loans to participants, which comprise the Loan Fund, are
         reported at cost, which approximates fair value.

     f.  Vesting - Employees eligible to participate in the Plan become 100
         percent vested in Company contributions made on or after January 1,
         1999. Matching contributions contributed on behalf of the participants
         for payroll dates December 31, 1998 and earlier will be fully vested
         after 5 years of service.

         Participant contributions are immediately 100 percent 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 10 years of credited service.

     h.  Form of Benefits - Benefits are paid in one lump sum generally.

     i.  Distribution from the Plan Because of Hardship - Withdrawals are
         permitted if a participant establishes, to the satisfaction of the
         Administrative Committee, a financial need for funds for which there is
         no other money available such as: (i) to purchase a primary residence,
         (ii) to pay uninsured medical expenses for the participant or immediate
         family, (iii) to prevent mortgage foreclosure on, or eviction from
         their primary residence, or (iv) to pay post-secondary educational
         expenses for the participant, spouse, children or dependents.

     j.  Payments from the Plan's Trust - Upon termination of service of a
         participant on or after retirement date or by reason of death or
         disability, an amount equal to the value of the participant's account
         as of the valuation date next following the date of termination of
         service, whether or not such participant has a vested interest in such
         account, is paid from the trust at age 59-1/2 or older.

     k.  Forfeitures - Forfeitures arising under the Plan during the year are
         first used to reduce employer contributions for the year and then used
         to pay administrative expenses of the Plan.

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 - Plan assets are held by American Express Trust
         Company (the "Trustee").

     b.  Investment  Valuation and Income  Recognition - The Plan's investments
         are stated at fair value.  Shares of mutual  funds and the  collective
         trust  ("American  Express Equity Index Fund II") are valued at quoted
         market prices,  which  represent the net asset value of shares held by
         the Plan at  year-end.  Participant  loans are  valued at  outstanding
         principle balance due for loans taken from individual accounts,  which
         approximates fair value. Purchase and sales of securities are recorded
         on a trade date basis. Dividends are recorded on the ex-dividend date.

         Amounts for securities that have no quoted market prices represent
         estimated fair value. The approximate value of the Covanta Stock Fund
         is the quoted market price of Covanta's stock.

         The American Express Trust Income Fund II which invests in
         benefit-responsive investments and is valued at contract value (cost
         plus accrued interest), which approximates fair value.

     c.  Use of Estimates - The preparation of financial statements in
         conformity with accounting principles generally accepted in the United
         States of America requires management to make estimates and assumptions
         that affect the reported amounts of net assets available for benefits
         and changes therein. Actual results could differ from the estimates and
         assumptions used.

     d.  Risks and Uncertainties - The Plan provides for various investment
         options (Note 3). Investment securities, in general, are exposed to
         various risks, such as interest rate, credit and overall market
         volatility. Due to the level of risk associated with certain investment
         securities, it is reasonably possible that changes in value of
         investment securities will occur in the near term and that such changes
         would materially affect participants' account balances and the amounts
         reported in the statements of net assets available for benefits.

     e.  Accounting  for  Derivative  Instruments  - The  Financial  Accounting
         Standards  Board  ("FASB")  issued  Statement of Financial  Accounting
         Standards ("SFAS") No. 133, Accounting for Derivative  Instruments and
         Hedging  Activities,  in June  1998.  SFAS No.  133,  as  amended  and
         interpreted,   establishes  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 net
         assets available for  benefits and to measure those instruments at fair
         value. Effective January 1, 2001, the Plan adopted this statement. The
         adoption of SFAS No. 133 had no impact on the financial  statements of
         the Plan for the year ended December 31, 2001.

     f.  Expenses - Administrative expenses of the Plan, are paid by either the
         Plan or the Plan's sponsor as provided in the Plan document.

3.   INVESTMENTS

         The following is a summary of the Plan's investments held by the
         Trustee at December 31, 2001 and 2000 that represent 5 percent or more
         of the Plan's net assets:

                                                         2001           2000

   Investments at fair value:
     *AXP Growth Fund                                 $ 7,905,144    $18,715,324
     *American Express Equity Index Fund II            10,575,176     18,261,231
     *AXP Mutual Fund Balanced Portfolio                3,198,526      5,324,939
     *AET U.S. Government Securities Fund II            5,029,366      8,680,355
     *American Express Trust Income Fund II            18,544,875          -
     *Fiduciary Capital Management Fixed Income Fund         -        22,793,995

     *Permitted party-in-interest



         During 2001, the Plan's investments (including gains and losses on
         investments bought and sold as well as held during the year)
         depreciated in value by $8,023,995 as follows:



     *American Express Equity Index Fund II                    $ (1,627,799)
     *AXP New Dimensions Fund                                      (532,528)
     *AXP Mutual Fund Balanced Portfolio                           (608,152)
     *Other American Express/American Express Trust
      Company Funds                                              (4,365,267)
     *Covanta Stock Fund                                         (1,983,870)
      Other Assets                                                1,093,621
                                                                ------------

                                                                $(8,023,995)
                                                               =============

     *Permitted party-in-interest

4.   INVESTMENT CONTRACTS

         The  Fiduciary  Capital  Management  Fixed Income Fund ("Fixed  Income
         Fund") invested in investment  contracts providing a guaranteed return
         on principal  invested over a specified time period.  The Fixed Income
         Fund  was   discontinued   effective   December  11,  2001.  The  Plan
         participants were given the option of transferring their investment to
         another  investment fund offered under the Plan, or any investment not
         transferred was automatically redirected to the American Express Trust
         Index Fund II. The crediting  interest  rates at December 31, 2001 for
         the  various   investment   contracts  ranged  from  6.54%  to  7.32%.
         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 $3,355,677 at December 31, 2000.

5.   NONPARTICIPANT DIRECTED INVESTMENTS

         Information about the net assets at December 31, 2001 and 2000 and
         significant components of the changes in net assets relating to the
         nonparticipant-directed investments for the year ended December 31,
         2001 and 2000 are as follows:

                                                         2001          2000

Net assets:
  Covanta Stock Fund                                   $ 502,762    $ 2,060,024
                                                       =========    ===========

                                                                       2001

Change in net assets:
  Contributions                                                       $ 132,740
  Net realized and unrealized depreciation of assets                 (1,018,895)
  Benefits paid to participants                                        (201,945)
  Administrative expenses                                                (2,917)
  Transfers to participant-directed investments                        (485,743)
                                                                    ------------

  Net change                                                        $(1,576,760)
                                                                    ============

6.   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.

7.   FEDERAL INCOME TAX STATUS

         The Internal Revenue Service has determined and informed the Company by
         letter dated June 14, 1995 that the Plan and related trust are designed
         in accordance with applicable sections of the Internal Revenue Code
         (the "Code"). The Plan has been amended since receiving the
         determination letter. However, the Plan Administrator and the Plan's
         counsel believe that the plan is designed and 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 statements.

8.   PARTY-IN-INTEREST TRANSACTIONS

         The  Covanta  Stock Fund  invested in Covanta  common  stock which was
         traded on the New York  Stock  Exchange  and  maintained  a small cash
         balance  invested in a money market fund for  liquidity  purposes (see
         Note 1).

         The Plan invests in certain mutual funds managed by the Trustee.

         Certain officers and employees of the Company (who may also be
         participants in the Plan) perform administrative services related to
         the operation, record keeping and financial reporting of the Plan. The
         Company pays these individuals salaries and also pays other
         administrative expenses on behalf of the Plan. Certain fees, including
         fees for the investment management services, to the extent not paid by
         the Company, are paid by the Plan.

         These transactions are not deemed prohibited party-in-interest
         transactions, because they are covered by statutory administrative
         exemptions from the Code's and ERISA's rules on prohibited
         transactions.

                                     ******


THE OGDEN 401(k) PLAN

FORM 5500, SCHEDULE H, PART IV, LINE 4i -
SCHEDULE OF ASSETS HELD AT END OF YEAR
DECEMBER 31, 2001
- --------------------------------------------------------------------------------


                                                  Description          Number
                                                       of                of                         Market
    Identity of Issue                              Investment       Shares/Units     Cost            Value

General Investments:
                                                                                     
  *Covanta Stock Fund                             Common Stock         393,179                 $    996,403
   AET U.S. Government Securities Fund II         Money Market       5,029,366                    5,029,366
  *American Express Equity Index Fund II        Collective Trust       332,031      2,458,536    10,575,176
  *Loan Fund                                        Loans**              N/A                        715,547
  *American Express Trust Income Fund II              GIC              847,417                   18,544,875
                                                                                                 ----------

Total General Investments                                                                        35,861,367
                                                                                                 ----------

Regulated Investment Companies:
  *AXP Growth Fund                                Mutual Fund          292,783                    7,905,144
  *AXP Mutual Fund Balanced Portfolio             Mutual Fund          339,907                    3,198,526
  *AXP New Dimensions Fund                        Mutual Fund           83,025                    2,040,762
   Templeton Foreign Fund                         Mutual Fund          230,209                    2,129,431
                                                                                                  ---------

Total Regulated Investment Companies                                                             15,273,863
                                                                                                 ----------

TOTAL                                                                                          $ 51,135,230
                                                                                               ============



*    Permitted party-in-interest
**   Notes receivable from participants (with
      interest from 6.5% to 10.5%; maturity
      from 2002 to 2010)



                                   SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the trustees (or other persons who administer The Ogden 401(k) Plan) have duly
caused this annual report to be signed on its behalf by the undersigned hereunto
duly authorized.



                                     The Ogden 401(k) Plan


Date:  July 15, 2002              By: /s/ Louis M. Walters
       -------------------------     -------------------------------------------
                                     Louis M. Walters
                                     Member of The Ogden 401(k) Plan
                                     Administrative Committee


                                  EXHIBIT INDEX


Exhibit Number           Description of Exhibit
- ---------------------    -------------------------------------------------------

23.1                     Consent of Independent Auditors