Document:

Exhibit 4.1

SECOND SUPPLEMENTAL
INDENTURE

SECOND SUPPLEMENTAL INDENTURE (this “Second
Supplemental Indenture”), dated as of April 30, 2007, by and among Midwest
Generation, LLC, a Delaware limited liability company (“MWG”), Midwest
Finance Corp., a Delaware corporation (“MWF” and, together with MWG, the
“Issuers”) and The Bank of New York, as Trustee (the “Trustee”)
to the Indenture (as defined below).

W I T N E S S E T H:

WHEREAS, the Issuers and the Trustee have heretofore
executed and delivered the Indenture, dated as of April 27, 2004, as
supplemented by the Supplemental Indenture, dated as of March 1, 2006, among
Midwest Generation Procurement Services, LLC, MWG, MWF and the Trustee (as
amended and supplemented, the “Indenture”), pursuant to which MWG and
MWF have together issued $1 billion aggregate principal amount of 8.75% Second
Priority Senior Secured Notes due 2034 (the “Notes”) outstanding;

WHEREAS, Section 9.02 of the Indenture provides that
the Issuers and the Trustee may, with certain exceptions, amend the Indenture
and the Notes with the consent of the Holders (as defined in the Indenture) of
at least a majority in aggregate principal amount of the Notes then
outstanding;

WHEREAS, Section 10.03 of the Indenture provides that
the Liens (as defined in the Indenture) upon the Collateral (as defined in the
Indenture) securing the Notes or any other Obligations (as defined in the
Indenture) under the Indenture may be released with the consent of the Holders
of the requisite percentage of Notes in accordance with Article 9 of the
Indenture, and Section 9.02 of the Indenture provides that any amendment to, or
waiver of, the provisions of the Indenture to release all of the Collateral (as
defined in the Indenture) from the Liens (as defined in the Indenture) securing
the Notes requires the consent of the Holders of at least 662⁄3% in
aggregate principal amount of the Notes then outstanding;

WHEREAS, MWG has distributed an Offer to Purchase and
Consent Solicitation Statement, dated as of April 17, 2007 (the “Solicitation
Statement”), to the Holders of the Notes in connection with a proposed
release of security interests in the Collateral securing the Notes as described
in the Solicitation Statement (the “Proposed Release”), certain proposed
amendments to the Indenture as described in the Solicitation Statement (the “Proposed
Amendments”) and the authorization of the Trustee to take, and to instruct
the Collateral Trustee to take, all actions as may be necessary to effectuate
the Proposed Release as described in the Solicitation Statement (the “Proposed
Authorization”);

WHEREAS, the Holders of at least 662⁄3% in
aggregate principal amount of the Notes then outstanding have duly consented to
the Proposed Release and the Proposed Authorization and the Holders of at least
a majority in aggregate principal

amount of the Notes then
outstanding have duly consented to the Proposed Amendments (together, the “Requisite
Consents”);

WHEREAS, the Board of Managers of MWG and the Board of
Directors of MWF have each determined that it is in the best interests of MWG
and MWF, respectively, to authorize and approve the Proposed Release, the
Proposed Amendments and the Proposed Authorization; and

WHEREAS, the execution and delivery of this Second
Supplemental Indenture has been duly authorized by all necessary corporate
action on the part of the Issuers and all conditions and requirements necessary
to make this instrument a valid and binding agreement have been duly performed
and complied with.

NOW THEREFORE, in consideration of the foregoing and
for other good and valuable consideration, the receipt and sufficiency of which
is hereby acknowledged, the Issuers and the Trustee mutually covenant and
agree, for the equal and ratable benefit of the Holders of the Notes, as
follows:

ARTICLE I- AMENDMENTS

Section
1.1.            Amendments to the
Definitions in the Indenture and the Notes.

(a)       Upon the
effective date of this Second Supplemental Indenture (i) certain definitions in
the Indenture shall be deemed deleted when references to such definitions would
be eliminated as a result of the amendments described herein, (ii)
cross-references to provisions in the Indenture that have been deleted as a
result of the Proposed Release and the Proposed Amendments shall be deemed
deleted, and (iii) certain other changes to the Indenture of a technical or
conforming nature shall be deemed made to the extent necessary to reflect the
deletion of the provisions described herein.

(b)       Any
definitions used exclusively in the provisions of the Notes that are hereby
deleted, and any definitions used exclusively within such definitions, are
hereby deleted in their entirety from the Notes, and all references in the
Notes to paragraphs, Sections, Articles or other terms or provisions of the
Indenture that have been otherwise deleted pursuant to this Second Supplemental
Indenture are hereby deleted in their entirety or revised to conform herewith,
as the case may be.

Section 1.2.            Amendments
to Article 3 — Redemption and Prepayment. 
The following Section of the Indenture, and any corresponding provisions
in the Notes, is hereby deleted in its entirety and replaced with “Intentionally
Omitted.”:

	
  Existing
  Section Number

  	
   

  	
  Caption

  
	
  Section 3.09

  	
   

  	
  Offer to Purchase by Application of Excess Proceeds.

  

 

 2
 

 

Section 1.3.            Amendments
to Article 4 — Covenants.  The
following Sections of the Indenture, and any corresponding provisions in the
Notes, are hereby deleted in their entirety and replaced with “Intentionally
Omitted.”:

	
  Existing
  Section Number

  	
   

  	
  Caption

  
	
  Section 4.03

  	
   

  	
  Reports.

  
	
  Section 4.04

  	
   

  	
  Compliance Certificate.

  
	
  Section 4.05

  	
   

  	
  Taxes.

  
	
  Section 4.06

  	
   

  	
  Stay, Extension and Usury Laws.

  
	
  Section 4.07

  	
   

  	
  Restricted Payments.

  
	
  Section 4.08

  	
   

  	
  Dividend and Other Payment Restrictions Affecting
  Subsidiaries.

  
	
  Section 4.09

  	
   

  	
  Incurrence of Indebtedness and Issuance of Preferred
  Equity.

  
	
  Section 4.10

  	
   

  	
  Asset Sales.

  
	
  Section 4.11

  	
   

  	
  Transactions with Affiliates.

  
	
  Section 4.12

  	
   

  	
  Liens.

  
	
  Section 4.13

  	
   

  	
  Business Activities.

  
	
  Section 4.14

  	
   

  	
  Corporate Existence.

  
	
  Section 4.15

  	
   

  	
  Offer to Repurchase Upon Change in Control.

  
	
  Section 4.16

  	
   

  	
  Limitation on Sale and Leaseback Transactions.

  
	
  Section 4.17

  	
   

  	
  Limitation on Issuances of Guarantees of
  Indebtedness.

  
	
  Section 4.18

  	
   

  	
  Maintenance of Assignability of Contracts

  
	
  Section 4.19

  	
   

  	
  Maintenance and Enforcement of the Powerton/Joliet
  Lease Intercompany Note and Powerton/Joliet Subordination Agreements.

  
	
  Section 4.20

  	
   

  	
  Restrictions on Activities of Midwest Finance.

  
	
  Section 4.21

  	
   

  	
  Payments for Consent.

  

 

Section 1.4.            Amendments
to Article 6 —Defaults and Remedies. 
Section 6.01 of the Indenture is hereby amended by deleting paragraphs
(3), (5), (6) and (7) thereof. The remaining paragraphs are renumbered
accordingly. In addition, paragraphs (10) and (11) in Section 6.01 of the
Indenture are hereby amended in their entirety to read as follows:

(6) Midwest pursuant to or within the meaning of
Bankruptcy Law:

(A) commences a
voluntary case;

(B) consents to the
entry of an order for relief against it in an involuntary case;

 3
 

 

(C) consents to the
appointment of a custodian of it or for all or substantially all of its
property and assets;

(D) makes a general assignment
for the benefit of its creditors; or

(E) generally is not
paying its debts as they become due;

(7) a court of competent jurisdiction enters an order or decree under any
Bankruptcy Law that:

(A) is for relief
against Midwest in an involuntary case;

(B) appoints a
custodian of Midwest; or

(C) orders the
liquidation of Midwest;

and the order or decree remains unstayed and in
effect for 60 consecutive days.

Section 1.5.            Amendments
to Article 8 — Legal Defeasance and Covenant Defeasance. Section 8.04 of the
Indenture is hereby amended by deleting paragraphs (2), (3), (5) and (6) in
their entirety.

Section 1.6.            Amendments
to Article 10 — Collateral and Security. Sections 10.03 and 10.04 of the
Indenture, and any corresponding provisions in the Notes, are deleted in their
entirety and replaced with “Intentionally Omitted.” Section 10.06 shall be
added to the Indenture, as follows:

Section 10.06         Authorization to Release Security in Respect of Notes; Collateral Trust
Agreement

(a)           Notwithstanding
anything to the contrary contained in this Indenture or the other Note
Documents, (i) the Holders hereby consent to the release of the security
interests and mortgage liens created by the Security Documents on the
Collateral in favor of the Holders and the Holders acknowledge and agree that
following such release, the Notes and all other Obligations under the Indenture
shall no longer constitute “Parity Lien Debt” under the Indenture or any other
Note Document and (ii) the Holders hereby authorize the Trustee to instruct the
Collateral Trustee, and the Collateral Trustee is hereby instructed and
authorized, to execute and deliver such documents and to take such other
actions as are necessary to effect and evidence such release, including
delivery of evidence of such release to Midwest in accordance with the
Collateral Trust Agreement.

(b)           Notwithstanding
anything to the contrary contained in this Indenture or the other Note
Documents, the Holders hereby authorize the Trustee and the Collateral Trustee
to execute any and all amendments or supplements to, or give any instructions
under or take any other actions with respect to, the Note Documents that are
reasonably requested by the Borrower (i) to release the security interests and
the mortgage lien created by the Security Documents on the Collateral in favor
of the Holders and (ii) to evidence that following such release, the Notes
shall not constitute “Parity Lien Debt” as defined in the Collateral Trust
Agreement.

 4
 

 

(c)           Notwithstanding
anything to the contrary set forth in the Indenture or the other Note
Documents, the Holders acknowledge and agree that following the release of the
security interest and mortgage liens on the Collateral in accordance with
clause (a) above, the Notes shall have not have any rights under the Collateral
Trust Agreement or any other Security Document.

ARTICLE II- MISCELLANEOUS

Section 2.1.            Execution
of Supplemental Indenture. This Second Supplemental Indenture is executed
and shall be constructed as an indenture supplement to the Indenture and, as
provided in the Indenture, this Second Supplemental Indenture forms a part
thereof.

Section 2.2.            Indenture
Remains in Full Force and Effect. Except as supplemented by this Second
Supplemental Indenture, all provisions in the Indenture and the Notes shall
remain in full force and effect.

Section 2.3.            Effect and Operation of Supplemental Indenture.  This
Second Supplemental Indenture shall be effective and binding immediately upon
its execution by MWG, MWF and the Trustee (so long as the Requisite Consents
have been received) but, notwithstanding anything in the Indenture or this
Second Supplemental Indenture to the contrary, the amendments to the Indenture
set forth in Section 1.1 through Section 1.6 of this Second Supplemental
Indenture shall not become operative unless and until the Notes tendered in
connection with the Solicitation Statement are accepted for purchase by MWG
(the time at which the tendered Notes are so accepted for purchase, the “Acceptance Time”)
and the Indenture will remain in effect in its current form until such
amendments become operative.  If the
offer and consent solicitation set forth in the Solicitation Statement is
terminated, withdrawn or otherwise not completed, this Second Supplemental
Indenture will have no force or effect, and the amendments to the Indenture set
forth in Section 1.1 through Section 1.6 of this Second Supplemental Indenture
will not become operative.

Section 2.4.            References
to Supplemental Indenture. Any and all notices, requests, certificates and
other instruments executed and delivered after the execution and delivery of
this Second Supplemental Indenture may refer to the Indenture without making
specific reference to this Second Supplemental Indenture, but nevertheless all
such references shall include this Second Supplemental Indenture unless the
context requires otherwise.

Section 2.5.            Conflict
with Trust Indenture Act. The Issuers will comply with the provisions of
the TIA.  If any provision of this Second
Supplemental Indenture limits, qualifies or conflicts with any provision of the
TIA that is required under the TIA

 5
 

to
be part of and govern any provision of this Second Supplemental Indenture, the
provision of the TIA shall control.  If
any provision of this Second Supplemental Indenture modifies or excludes any
provision of the TIA that may be so modified or excluded, the provision of the
TIA shall be deemed to apply to the Indenture as so modified or to be excluded
by this Second Supplemental Indenture, as the case may be.

Section 2.6.            Severability.
If any court of competent jurisdiction shall determine that any provision in
this Second Supplemental Indenture shall be invalid, illegal or unenforceable,
the validity, legality and enforceability of the remaining provisions shall not
in any way be affected or impaired thereby.

Section 2.7.            Terms
Defined in the Indenture. All capitalized terms not otherwise defined
herein shall have the meanings ascribed to them in the Indenture.

Section 2.8.            Headings.
The Article and Section headings of this Second Supplemental Indenture have
been inserted for convenience of reference only, are not to be considered a
part of this Second Supplemental Indenture and shall in no way modify or
restrict any of the terms or provisions hereof.

Section 2.9.            Benefits
of Second Supplemental Indenture. 
Nothing in this Second Supplemental Indenture or the Notes, express or
implied, shall give to any Person, other than the parties hereto and thereto
and their successors hereunder and thereunder and the Holders of the Notes any
benefit of any legal or equitable right, remedy or claim under the Indenture,
this Second Supplemental Indenture or the Notes.

Section 2.10.          Successors.
All agreements of MWG and MWF in this Second Supplemental Indenture shall bind
their respective successors.  All agreements
of the Trustee in this Second Supplemental Indenture shall bind its successors.

Section 2.11.          Concerning
the Trustee. The recitals contained herein and in the Notes, except with
respect to the Trustee’s certificates of authentication, shall be taken as the
statements of the Issuers, and the Trustee assumes no responsibility for the
correctness of the same.  The Trustee
makes no representations as to the validity or sufficiency of this Second
Supplemental Indenture or of the Notes.

Section 2.12.          Certain
Duties and Responsibilities of the Trustee. 
In entering into this Second Supplemental Indenture, the Trustee shall
be entitled to the benefit of every provision of the Indenture and the Notes
relating to the conduct or affecting the liability or affording protection to
the Trustee, whether or not elsewhere herein so provided.

Section 2.13.          Counterparts.  This Second Supplemental Indenture may be
executed in any number of counterparts, each of which when so executed shall be
deemed to be an original, but all such counterparts shall together constitute
but one and the same instrument.

 6
 

 

Section 2.14.          GOVERNING
LAW. THIS SECOND SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY THE INTERNAL
LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO CHOICE OF LAW RULES (OTHER THAN
SECTION 5-1401 OF THE NEW YORK GENERAL OBLIGATIONS LAW).

Section 2.15.          Confirmation.
Each of the Issuers and the Trustee hereby confirms and reaffirms the Indenture
in every particular except as amended and supplemented by this Second
Supplemental Indenture.

IN WITNESS WHEREOF, the
parties hereto have caused this Second Supplemental Indenture to be duly
executed by their respective officers thereunto duly authorized as of the date
first above written.

	
  

  	
  MIDWEST GENERATION, LLC

   

  
	
   

  	
  By:

  	
  /s/ Steven D. Eisenberg

  
	
   

  	
   

  	
  Name: Steven D. Eisenberg

  Title: Vice President

  
	
   

  	
   

  	
   

  
	
   

  	
  MIDWEST FINANCE CORP.

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Steven D. Eisenberg

  
	
   

  	
   

  	
  Name: Steven D. Eisenberg

  Title: Vice President

  
	
   

  	
   

  	
   

  
	
   

  	
  THE BANK OF NEW YORK

  
	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Christopher J. Grell

  
	
   

  	
   

  	
  Name: Christopher J. Grell

  Title: Vice President

  

 

Acknowledged by:

	
  MIDWEST GENERATION
  PROCUREMENT SERVICES, LLC

   

  
	
  By:

  	
  /s/ Steven D. Eisenberg

  
	
   

  	
  Name: Steven D. Eisenberg

  Title: Vice President

  
	
   

  	
   

  

 

 7Exhibit 10.1

CoBank

Rural
America’s Cooperative Bank

P.O
Box 5110

Denver,
Colorado 80217

5500
South Quebec Street

Greenwood
Village, Colorado 80111

Phone:
(303) 740-4000

Fax:
(303) 694-5851 (Closing Dept.)

April 26, 2007

Mr. Ed Irion, CFO

Dakota Growers Pasta
Company, Inc.

One Pasta Avenue

Carrington, North
Dakota  58421-0021

RE:         Temporary Extension of Term Loan
Supplement RIE539T07 / CIF # 38031300

Dear Mr. Irion:

The term of the
commitment under your existing Term Loan Supplement numbered RIE539T07 has been
extended from April 30, 2007, up to and including May 31, 2007, to allow you
additional time to advance funds.  All
other terms of the supplement will remain the same until such date that a new
and/or replacement supplement is executed by your company and CoBank.

It is important that you keep this letter with your original loan
documentation.

Should
you have any questions, please contact Jeff Doorenbos at (800) 282-4150,
(ext. 77932).

	
  Sincerely,

  
	
   

  
	
  /s/ Rebecca S. Kennedy

  	
   

  
	
   

  
	
  Assistant Corporate Secretary

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