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

For the fiscal year ending DECEMBER 31, 2004

Commission File Number 1-16463

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

             PEABODY ENERGY CORPORATION EMPLOYEE STOCK PURCHASE PLAN
--------------------------------------------------------------------------------

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

                           PEABODY ENERGY CORPORATION
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             701 MARKET STREET, ST. LOUIS, MISSOURI       63101-1826            
--------------------------------------------------------------------------------
            (Address of principal executive offices)      (Zip Code)



                                TABLE OF CONTENTS



                                                                             PAGE
                                                                             ----
                                                                          
Report of Independent Registered Public Accounting Firm....................    2

Financial Statements:

      Statements of Net Assets Available for Benefits -
      December 31, 2004 and 2003...........................................    3

      Statements of Changes in Net Assets Available for Benefits -
      Years Ended December 31, 2004, 2003 and 2002.........................    4

      Notes to Financial Statements........................................    5

Signatures.................................................................    9

Exhibit Index..............................................................   10

Exhibit 23 - Consent of Independent Registered Public Accounting Firm......   11




             Report of Independent Registered Public Accounting Firm

The Plan Administrators and Participants
Peabody Energy Corporation Employee Stock Purchase Plan

We have audited the accompanying statements of net assets available for benefits
of Peabody Energy Corporation Employee Stock Purchase Plan as of December 31,
2004 and 2003, and the related statements of changes in net assets available for
benefits for the years ended December 31, 2004, 2003, and 2002. 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 the standards of the Public Company
Accounting Oversight Board (United States). Those standards require that we plan
and perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement. We were not engaged to perform an
audit of the Plan's internal control over financial reporting. Our audit
included consideration of internal control over financial reporting as a basis
for designing audit procedures that are appropriate in the circumstances, but
not for the purpose of expressing an opinion on the effectiveness of the Plan's
internal control over financial reporting. Accordingly, we express no such
opinion. An audit also includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements, assessing the
accounting principles used and significant estimates made by management, and
evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in
all material respects, the net assets available for benefits of the Plan at
December 31, 2004 and 2003, and the changes in its net assets available for
benefits for the years then ended, in conformity with U.S. generally accepted
accounting principles.

/s/ Ernst & Young LLP

St. Louis, Missouri
March 11, 2005



             PEABODY ENERGY CORPORATION EMPLOYEE STOCK PURCHASE PLAN

                 STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS



                                                                       December 31,
                                                             -------------------------------
                                                                 2004              2003
                                                             -------------     -------------
                                                                         
ASSETS
 Participant deposits due from Peabody Energy Corporation    $   1,349,168     $   1,139,357

LIABILITIES
 Stock purchase payable                                          1,349,168         1,139,357
                                                             -------------     -------------

NET ASSETS AVAILABLE FOR BENEFITS                            $           -     $           -
                                                             =============     =============


                 See accompanying notes to financial statements.

                                       3



             PEABODY ENERGY CORPORATION EMPLOYEE STOCK PURCHASE PLAN

           STATEMENTS OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS



                                                                  Year Ended December 31,
                                                 --------------------------------------------------------
                                                      2004                  2003                2002
                                                 ---------------      ----------------      -------------
                                                                                   
ADDITIONS TO NET ASSETS:
  Participant contributions                      $     2,553,361      $      2,198,057      $   2,883,183

DEDUCTIONS FROM NET ASSETS:
  Contributions held for future stock purchases       (1,349,168)           (1,139,357)          (676,916)
  Contributions used for stock purchases              (1,204,193)           (1,058,700)        (2,206,267)
                                                 ---------------      ----------------      -------------

NET CHANGE                                                     -                     -                  -

NET ASSETS AVAILABLE FOR BENEFITS:
  Beginning of period                                          -                     -                  -
                                                 ---------------      ----------------      -------------

  End of period                                  $             -      $              -      $           -
                                                 ===============      ================      =============


                See accompanying notes to financial statements.

                                       4



             PEABODY ENERGY CORPORATION EMPLOYEE STOCK PURCHASE PLAN

                          NOTES TO FINANCIAL STATEMENTS
                                DECEMBER 31, 2004

1.    DESCRIPTION OF PLAN

Basis of Presentation

On March 2, 2005, Peabody Energy Corporation (the "Company"), the sponsor of the
Peabody Energy Corporation Employee Stock Purchase Plan (the "Plan"), announced
a two-for-one stock split on all shares of its common stock payable to
shareholders of record at the close of business on March 16, 2005. The
additional shares will be distributed on March 30, 2005. All share amounts in
these notes to the financial statements reflect the stock split.

General

The following general description of the Plan is provided for general
information purposes only. Participants should refer to the Plan document for
complete information.

The Plan is an employee stock purchase plan, established on May 22, 2001, that
enables eligible employees of the Company and certain of its subsidiaries to
purchase Peabody Energy Corporation common stock at a discount from fair market
value. The purchase price is equal to 85 percent of the lower of the fair market
value of the stock on the first or last day of an offering period. Fair market
value is the closing price on each of the applicable dates, as quoted on the New
York Stock Exchange ("NYSE"). Each plan year contains two serial offering
periods of six-month duration. Subsequent six-month offering periods
automatically commence unless otherwise specified by the Plan administrator.
Purchased shares of common stock are issued by the Company to participant
brokerage accounts maintained outside of the Plan by the Plan custodian.

In December 2002, the Plan Administrator changed the Plan offering periods to
coincide with the Plan's fiscal year. As a result, the offering periods changed
from April 1 through September 30 and October 1 through March 30 to January 1
through June 30 and July 1 through December 31. In order to transition to the
new offering periods in 2003, a shortened offering period occurred for the
period April 1, 2003 through June 30, 2003.

The Plan terminates the earlier of May 22, 2011 or upon issuance of all
available shares, as amended from time to time. There were 3.0 million shares of
the Company's common stock authorized for sale under the Plan, and as of
December 31, 2004, 799,774 shares of this allotment had been sold, leaving
2,200,226 shares available for sale in the future. Common stock sold under the
Plan may be newly issued or sold from treasury stock.

The Plan is intended to qualify as an "employee stock purchase plan" under
Section 423 of the U.S. Internal Revenue Code of 1986, as amended (the "Code").
The Plan is not intended to be a qualified pension, profit-sharing or stock
bonus plan under Code Section 401(a), nor is it subject to the provisions of the
Employee Retirement Income Security Act of 1974, as amended.

                                       4



Administration of the Plan

The Plan is administered by a committee appointed by the Peabody Energy
Corporation Board of Directors. Allecon Stock Associates, L.L.C. serves as the
recordkeeper and A.G. Edwards & Sons, Inc. serves as the custodian for the Plan.

Eligibility

Current employees of the Company or a participating subsidiary of the Company
are eligible to participate in the Plan if:

      -     their customary employment is more than 20 hours per week and they
            are employed more than five months per year; and

      -     they own less than five percent of the total combined voting power
            of all outstanding shares of all classes of securities of the
            Company.

Participation begins on the first day of the offering period.

Participant Accounts

A separate account is maintained by the custodian for each Plan participant.
Each plan participant account reflects the quantity and pricing of that
participant's share purchases and sales, dividends reinvested and investment
gains and losses. Assets held in participant accounts are neither assets of the
Plan nor the Company.

Contributions

The Plan allows participants to elect an after-tax contribution rate of 1% to
15% of the employee's eligible compensation, which includes straight time wages
or base salary. Bonuses, incentive compensation, overtime, commissions and shift
premiums paid to an employee are not included in eligible compensation. Plan
participants may modify their contribution rate once during each offering
period. Contributions are made through payroll deductions and are held by the
Company until shares are purchased. Employees may not purchase more than $25,000
worth of stock through the Plan in any calendar year; contributions in excess of
this amount are refunded to the employee. No interest is paid on contributions
made during an offering period. The Company does not make contributions to the
Plan.

Employee contributions are used to purchase shares of the Company's stock on the
purchase date, or the last day during which the NYSE is open during each
offering period. Purchases are made in whole and fractional shares. A
participant may withdraw or discontinue their contributions to the Plan prior to
15 days before the purchase date. If contributions are discontinued, the
participant may either elect to have all contributions made during the offering
period refunded or leave all contributions deducted during the current offering
period to purchase stock at the end of the offering period. Any shares
previously purchased remain in the participant's account despite discontinuing
contributions or withdrawing from the Plan. Purchases are made automatically,
unless a participant withdrawal is executed.

Sale of Stock

Shares purchased under the Plan are subject to a restriction period of 18 months
from the date the shares are purchased. Shares may not be sold, pledged or
transferred during this 18-month restriction period.

                                        5



Dividends

Dividends paid on stock held in participant accounts are automatically
reinvested in additional shares or fractional shares of the Company's stock.
Shares purchased with dividends are priced at 100% of the fair market value of
the stock on the date dividends are paid. There is no time requirement for
holding shares purchased with dividends.

2.    ACCOUNTING POLICIES

Basis of Accounting

The financial statements of the Plan are maintained on the accrual basis of
accounting.

Plan Expense

Administrative fees and expenses of the Plan are paid by the Company.

Use of Estimates in Preparation of Financial Statements

The preparation of financial statements in conformity with accounting principles
generally accepted in the United States requires the Plan Administrator and the
Company to make estimates and assumptions that affect the amounts reported in
the financial statements and accompanying notes. Actual results may differ from
these estimates.

3.    PARTICIPANT DEPOSITS DUE FROM PEABODY ENERGY CORPORATION AND STOCK
      PURCHASE PAYABLE

As of December 31, 2004 and 2003, the Plan had an obligation to purchase the
Company's common stock on behalf of the participants in an amount equal to the
participant contributions held on deposit by the Company. The liability is
reflected in the accompanying Statements of Net Assets Available for Benefits as
"Stock purchase payable." Amounts contributed by Plan participants during the
offering period from July 1, 2004 to December 31, 2004 and July 1, 2003 to
December 31, 2003 are reflected as "Participant deposits due from Peabody Energy
Corporation." All shares purchased were deposited directly to the participants'
accounts.

4.    TAX STATUS

The Plan, and the rights of participants to make purchases thereunder, is
intended to qualify as an "employee stock purchase plan" under Section 423 of
the Code. The Plan is not qualified under Section 401(a) of the Code. Pursuant
to Section 423 of the Code, no income, other than dividends on shares held in
participant accounts, will be taxable to a participant until disposition of the
shares purchased under the Plan. Upon the disposition of the shares, the
participant will generally be subject to tax and the amount and character of the
tax will depend upon the holding period and disposition price. Dividends
received on shares held in the participant's account are taxable to the
participant as ordinary income. The Plan does not provide for income taxes.

5.    PLAN MODIFICATIONS

The Peabody Energy Corporation Board of Directors may amend or suspend the Plan
at any time. However, no amendment can adversely affect participant rights under
the Plan in the current offering period.

                                       6



Although it has not expressed any intent to do so, the Peabody Energy
Corporation Board of Directors may terminate the Plan at any time. If it does,
the Plan will terminate in its entirety, and no further purchase rights will be
granted or exercised and no further payroll contributions will be collected. In
the event of a termination of the Plan, all contributions held by the Plan would
be refunded to the Plan participants at the time of termination.

6.    SUBSEQUENT EVENTS

On March 2, 2005, the Company announced that its board of directors authorized a
two-for-one stock split on all shares of its common stock. Shareholders of
record at the close of business on March 16, 2005 will be entitled to a dividend
of one share of stock for every share held. The additional shares will be
distributed on March 30, 2005, and the stock will begin trading ex-split on
March 31, 2005. Accordingly, all shareholders are entitled to a dividend of one
share of stock for every share owned. As discussed in Note 1, all share amounts
in these notes to the financial statements reflect the stock split.

                                       7



SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the plan
administrator of the Peabody Energy Corporation Employee Stock Purchase Plan has
duly caused this annual report to be signed on its behalf by the undersigned,
hereunto duly authorized.

                                                Peabody Energy Corporation
                                                Employee Stock Purchase Plan

 Date: March 28, 2005                       By:  /s/ Sharon D. Fiehler
                                               ---------------------------------
                                                Sharon D. Fiehler

                                                Peabody Energy Corporation
                                                Executive Vice President -
                                                Human Resources & Administration

                                       8



                                  EXHIBIT INDEX

The exhibits below are numbered in accordance with the Exhibit Table of Item 601
of Regulation S-K.



Exhibit
  No.                                Description of Exhibit
-------   ---------------------------------------------------------------------------
       
   23     Consent of Ernst & Young LLP, Independent Registered Public Accounting Firm


                                       9