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                                                                   EXHIBIT 4.193

                            CERTIFICATE OF FORMATION

                                       OF

                         WILLIAMSVILLE COAL COMPANY, LLC

         1.       The name of the limited liability company is:

                        WILLIAMSVILLE COAL COMPANY, LLC.

         2.       The address of its registered office in the State of Delaware
                  is Corporation Trust Center, 1209 Orange Street, in the City
                  of Wilmington, County of New Castle. The name of its
                  registered agent at such address is The Corporation Trust
                  Company.

         3.       This Certificate of formation shall be effective on September
                  8, 2003.

         IN WITNESS WHEREOF, the undersigned have executed this Certificate of
Formation of WILLIAMSVILLE COAL COMPANY, LLC this 8th day of September, 2003.

                                                              /S/ JOSEPH W. BEAN
                                                              ------------------
                                                                  Joseph W. Bean
                                                                       Organizer<PAGE>

                                                                   EXHIBIT 4.194

                       LIMITED LIABILITY COMPANY AGREEMENT
                                       OF
                         WILLIAMSVILLE COAL COMPANY, LLC

                  THIS LIMITED LIABILITY COMPANY AGREEMENT ("Agreement") of
WILLIAMSVILLE COAL COMPANY, LLC, (the "LLC") is dated as of September 5, 2003
and made by Midwest Coal Acquisition Corp., a Delaware corporation (the
"Member").

                                   WITNESSETH:

                  WHEREAS, the LLC is a limited liability company formed under
the Delaware Limited Liability Company Act (the "Delaware LLC Act") pursuant to
a Certificate of Formation filed with the Delaware Secretary of State on
September 5, 2003; and

                  WHEREAS, the Member is the Member of the LLC.

                  NOW, THEREFORE, the Member hereby declares as follows:

1.       LLC FORMATION, NAME, PLACE OF BUSINESS

         1.1      FORMATION OF LLC; CERTIFICATE OF FORMATION

                  The Member of the LLC hereby acknowledges the formation of the
LLC as a limited liability company pursuant to the Delaware LLC Act by virtue of
the filing of a Certificate of Formation with the Delaware Secretary of State on
September 5, 2003.

         1.2      NAME OF LLC

                  The name of the LLC as of the date of this Agreement is and
shall continue to be "Williamsville Coal Company, LLC". The business of the LLC
may be conducted under any other name that is permitted by the Delaware LLC Act
and selected by the Member. The Manager designated pursuant to the terms of this
Agreement promptly shall execute, file, and record any assumed or fictitious
name certificates required by the laws of the State of Delaware or any state in
which the LLC conducts business and shall take such other action as such Manager
determines is required by or advisable under the laws of the State of Delaware,
or any other state in which the LLC conducts business, to use the name or names
under which the LLC conducts business.

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         1.3      PLACE OF BUSINESS

                  The LLC's principal place of business shall be Charleston, WV.
The Manager may establish and maintain such other offices and additional places
of business of the LLC, either within or without the State of Delaware, or close
any office or place of business of the LLC, as he or she deems appropriate.

         1.4      REGISTERED AGENT

                  The street address of the initial registered office of the LLC
shall be:

                           The Corporation Trust Company
                           Corporation Trust Center
                           1209 Orange Street
                           Wilmington, Delaware 19801

and the LLC's registered agent at such address shall be Corporation Service
Company. The Manager may from time to time appoint a new resident agent for the
LLC.

2.       PURPOSES AND POWERS OF LLC

         2.1      PURPOSES

                  The purposes of the LLC shall be (i) to invest in, develop
and/or operate various power generating facilities, coal mines and other
energy-related concerns, (ii) to undertake any lawful transactions and engage in
any lawful activity incidental to or in furtherance of the foregoing purpose or
otherwise related to the energy business; and (iii) as agreed by the Manager, to
engage in any other lawful business, purpose or activity permitted by the
Delaware LLC Act.

         2.2      POWERS

                  The LLC shall have all the powers and privileges as are
necessary or convenient to the conduct, promotion, or attainment of the
business, purposes or activities of the LLC.

3.       TERM OF LLC

                  The LLC commenced on the date upon which the Certificate of
Formation was duly filed with the Delaware Secretary of State and shall continue
until the dissolution of the LLC as provided by the Delaware LLC Act.

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4.       LIABILITY OF MEMBER AND MANAGER

                  Except as otherwise provided in the Delaware LLC Act, the
debts, obligations and liabilities of the LLC, whether arising in contract, tort
or otherwise, shall be solely the debts, obligations and liabilities of the LLC,
and neither the Member nor the Manager, nor any director, officer, employee,
shareholder, controlling person or agent of the LLC or the Member shall be
obligated personally for any such debt, obligation or liability of the LLC
solely by reason of being a member or a manager, director, officer, employee,
shareholder, controlling person or agent of the LLC or the Member. The failure
of the LLC to observe any formalities or requirements relating to the exercise
of its power or management of its business or affairs under the Delaware LLC Act
or this Agreement shall not be grounds for imposing personal liability on the
Member, the Manager, or any director, officer, employee, shareholder,
controlling person or agent of the LLC or the Member for liabilities of the LLC.

5.       CAPITALIZATION, MEMBERSHIP INTEREST AND DISTRIBUTIONS OF CASH FLOW AND
         CERTAIN PROCEEDS.

         5.1      CAPITALIZATION

         Concurrent with the execution of this Agreement, the Member shall make
a $1,000 capital contribution to the LLC, in cash.

         5.2      NO ADDITIONAL CAPITAL CONTRIBUTIONS

                  The Member shall have no obligation to make additional capital
contributions to the LLC.

         5.3      MEMBERSHIP INTEREST

                  The Member shall own one hundred percent (100%) of the
membership interests in the LLC, and all profits and losses shall be allocated
to the Manager.

         5.4      DISTRIBUTIONS

                  The Member shall decide whether and in what amounts the
proceeds received by the LLC shall be distributed. All such proceeds, if any,
shall be distributed one hundred percent (100%) to the Member.

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6.       MANAGEMENT

         6.1      MANAGEMENT BY MANAGER

                  Management of the LLC is vested in a Manager and not in the
Member. The Manager shall be elected by the Member. The Manager may exercise all
such powers of the LLC and do all such lawful acts and things as may be done by
a manager of a limited liability company under the Act.

         6.2      MANAGER'S TERM OF OFFICE

                  The Manager shall remain in office until he or she resigns or
is removed from the office by the Member. Roger B. Walcott, Jr. shall be the
initial Manager of the LLC. The Manager will devote such time and attention to
the LLC as is appropriate to manage the affairs of the LLC to its best
advantage.

         6.3      IMPLEMENTATION OF ACTIONS OF MANAGER

                  The decisions and actions of the Manager shall be carried out
by the Manager or such other individuals granted authority to act on behalf of
the Manager, pursuant to decisions made or resolutions adopted from time to time
by the Manager.

7.       INDEMNIFICATION OF MEMBER, MANAGER REPRESENTATIVES, COMMITTEE MEMBERS
         AND EMPLOYEES

         7.1      INDEMNIFICATION

                  The LLC shall indemnify and hold harmless the Member, the
Manager and each director, officer, employee, shareholder, controlling person,
agent and representative of the LLC and of the Member (individually, in each
case, an "Indemnitee") to the fullest extent permitted by law from and against
any and all losses, claims, demands, costs, damages, liabilities (joint or
several), reasonable expenses of any nature (including reasonable attorneys'
fees and disbursements), judgments, fines, settlements, and other amounts
arising from any and all claims, causes of action, demands, actions, suits, or
proceedings (unless asserted by the LLC against the Indemnitee), whether civil,
criminal, administrative or investigative, in which the Indemnitee may be
involved, or threatened to be involved, as a party or otherwise, arising out of
or incidental to the business or activities of or relating to the LLC (a
"Claim"), regardless of whether such Indemnitee continues to be a Member or
Manager or a director, officer, employee, shareholder, controlling person, agent
or representative of the LLC or the Member at the time any such liability or
expense is paid or incurred, if such Indemnitee determined in good faith that
such conduct was in the best interest of the LLC and such Indemnitee's conduct
did not constitute fraud, gross negligence, or willful misconduct and

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was within the scope of the Indemnitee's authority; provided that all claims for
indemnification by an Indemnitee shall be made only against and shall be limited
to the assets of the LLC and no Indemnitee shall have recourse against the
Member with respect to any such Claim. The termination of any action, suit, or
proceeding by judgment, order, settlement, or conviction, or upon a plea of nolo
contendre or its equivalent shall not, in and of itself, create a presumption or
otherwise constitute evidence that the Indemnitee's conduct did constitute
fraud, gross negligence, or willful misconduct.

         7.2      EXPENSES

                  Expenses incurred by an Indemnitee in defending any Claim
subject to this SECTION 7 shall, from time to time, upon request by the
Indemnitee, be advanced by the LLC prior to the final disposition of such Claim
upon receipt by the LLC of an undertaking by or on behalf of the Indemnitee to
repay such amount, together with interest on any such advance or advances at the
rate equal to two percentage points above the "Federal short-term rate" as
defined in the Internal Revenue Code section 1274(d)(1)(C)(i) or the maximum
rate permitted under applicable law, promptly upon (and in no event more than
ten days after) a determination in a judicial proceeding or a binding
arbitration that such Indemnitee is not entitled to be indemnified as authorized
in this SECTION 7.

         7.3      OTHER RIGHTS

                  The indemnification provided by this SECTION 7 shall be in
addition to any other rights to which an Indemnitee may be entitled under any
agreement or as approved by the Member, as a matter of law or equity, or
otherwise, both as to an action in such Indemnitee's capacity as the Member or
Manager or as a director, officer, employee, shareholder, controlling person,
agent or representative of the LLC or the Member, and as to an action in another
capacity, and shall continue as to an Indemnitee who has ceased to serve in such
capacity with respect to those periods during which such Indemnitee served, and
shall inure to the benefit of the heirs, successors, assigns, and administrators
of the Indemnitee.

         7.4      NOTICE

                  Promptly after receipt of notice of the commencement of any
Claim, an Indemnitee will, if indemnification in respect thereof is to be sought
against the LLC under this SECTION 7, notify the LLC of the initiation thereof,
but the omission so to notify the LLC will not relieve the LLC from any
liability that the LLC may have to such Indemnitee otherwise than under this
SECTION 7, or under this SECTION 7 except to the extent that the LLC is
adversely affected by such lack of notice.

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         7.5      COUNSEL

                  The LLC shall have the right to undertake, by counsel or other
representatives of its own choosing, the defense or other resolution of any
Claim. In the event that the LLC shall elect not to undertake such defense or
other resolution or within a reasonable time after notice of such Claim from an
Indemnitee, the LLC shall fail to defend or otherwise resolve such Claim, such
Indemnitee (upon further written notice to the LLC) shall have the right to
undertake the defense, compromise, or settlement of such Claim, by counsel or
other representatives of its own choosing, on behalf of and for the account and
risk of the LLC.

         7.6      OTHER PERSONS

                  The provisions of this SECTION 7 are for the benefit of the
Indemnitees and shall not be deemed to create any rights for the benefit of any
other person or entity.

         7.7      INSURANCE

                  The LLC may purchase and maintain insurance of a kind normal
and customary in the industry in which the LLC conducts business on behalf of
any Indemnitee against any liability asserted against an Indemnitee and incurred
by an Indemnitee in such capacity, or arising out of such Indemnitee's status as
aforesaid, whether or not the LLC would have the power to indemnify such
Indemnitee against such liability under this SECTION 7.

8.       DISSOLUTION AND LIQUIDATION

         8.1      EFFECT OF DISSOLUTION

                  Upon dissolution, the LLC shall cease carrying on its business
but shall not terminate until the winding up of the affairs of the LLC is
completed, the assets of the LLC shall have been distributed as provided below
and a Certificate of Cancellation of the LLC under the Delaware LLC Act has been
filed with the Secretary of State of the State of Delaware.

         8.2      LIQUIDATION UPON DISSOLUTION

                  Upon the dissolution of the LLC, sole and plenary authority to
effectuate the liquidation of the assets of the LLC shall be vested in the
Manager, which shall have full power and authority to sell, assign and encumber
any and all of the LLC's assets and to wind up and liquidate the affairs of the
LLC in an orderly and business-like manner. The proceeds of

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liquidation of the assets of the LLC distributable upon a dissolution and
winding up of the LLC shall be applied in the following order of priority:

                  (i)      first, to the creditors of the LLC, which may include
the Member as a creditor, in the order of priority provided by law, in
satisfaction of all liabilities and obligations of the LLC (or any nature
whatsoever, including, without limitation, fixed or contingent, matured or
unmatured, legal or equitable, secured or unsecured), whether by payment or the
making of reasonable provisions for payment thereof; and

                  (ii)     thereafter, one hundred percent (100%) to the Member.

         8.3      WINDING UP AND CERTIFICATE OF CANCELLATION

                  The winding up of the LLC shall be completed when all of its
debts, liabilities, and obligations have been paid and discharged or reasonably
adequate provisions therefor has been made, and all of the remaining property
and assets of the LLC have been distributed to the Member. Upon the completion
of the winding up of the LLC, a Certificate of Cancellation of the LLC shall be
filed with the Delaware Secretary of State.

9. AMENDMENT

                  This Agreement may be amended or modified by a written
instrument executed by the Member.

10. GOVERNING LAW

                  This Agreement shall be governed and construed in accordance
with the laws of the State of Delaware without regard to any applicable
conflicts of law.

                  IN WITNESS WHEREOF, the undersigned has duly executed this
Agreement, as of the day and year first herein above set forth.

                                      MIDWEST COAL ACQUISITION CORP.

                                      By:    /s/ STEVEN F. SCHAAB
                                             ------------------------------
                                      Name:  Steven F. Schaab
                                             ------------------------------
                                      Title: Vice President and Treasurer
                                             ------------------------------

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