EXHIBIT 10.1
Big Stone II Power Plant
Amendment No. 5 to
Participation Agreement
By and Among
CENTRAL MINNESOTA MUNICIPAL POWER AGENCY,

GREAT RIVER ENERGY,

HEARTLAND CONSUMERS POWER DISTRICT,

MONTANA-DAKOTA UTILITIES CO., A DIVISION OF MDU

RESOURCES GROUP, INC.,

OTTER TAIL CORPORATION dba OTTER TAIL POWER COMPANY,

SOUTHERN MINNESOTA MUNICIPAL POWER AGENCY, AND

WESTERN MINNESOTA MUNICIPAL POWER AGENCY

As
Owners
Effective
September 1, 2007
Amendment No. 5 to Participation Agreement
Effective: September 1, 2007
Vote Date: On September 21, 2007

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Amendment No. 5 to Participation Agreement
     THIS AMENDMENT NO. 5 TO PARTICIPATION AGREEMENT (this “Amendment”) is made
as of September 1, 2007, by and among Central Minnesota Municipal Power Agency,
an agency incorporated under the laws of the State of Minnesota (“CMMPA”), Great
River Energy, a cooperative corporation incorporated under the laws of the State
of Minnesota (“GRE”), Heartland Consumers Power District, a consumers power
district formed and organized under the South Dakota Consumers Power District
Law (Chapter 49-35 of the South Dakota Codified Laws) (“Heartland”),
Montana-Dakota Utilities Co., a Division of MDU Resources Group, Inc., a
corporation incorporated under the laws of the State of Delaware
(“Montana-Dakota”), Otter Tail Corporation, a corporation incorporated under the
laws of the State of Minnesota, doing business as Otter Tail Power Company
(“Otter Tail”), Southern Minnesota Municipal Power Agency, a municipal
corporation and political subdivision of the State of Minnesota (“SMMPA”), and
Western Minnesota Municipal Power Agency, a municipal corporation and political
subdivision of the State of Minnesota (“WMMPA”) (each individually a “Party”
and, collectively, the “Parties”).
RECITALS
     WHEREAS, the Parties have entered into a Participation Agreement, dated
June 30, 2005 (the “Agreement”), and an Amendment No. 1 to the Participation
Agreement dated effective as of June 1, 2006 (the “Amendment No. 1”), an
Amendment No. 2 to the Participation Agreement dated August 1, 2006 (the
“Amendment No. 2”), Amendment No. 3 to the Participation Agreement dated
effective as of September 1, 2006 (the “Amendment No. 3”), and an Amendment
No. 4 to the Participation Agreement dated effective June 8, 2007 (individually,
the “Amendment No. 4” and collectively with the Agreement and the Amendment
No. 1, the Amendment No. 2, and the Amendment No. 3, the “Amended Agreement”),
to provide for their ownership as tenants in common of BSP II and set forth
certain responsibilities and mechanisms for the design, construction, ownership,
operation, maintenance and repair of BSP II; and
     WHEREAS, the Parties desire to amend the Amended Agreement as and to the
extent provided in this Amendment.
     NOW, THEREFORE, in consideration of the agreements and covenants set forth
herein, and other good and valuable consideration, the receipt and sufficiency
of which is hereby acknowledged, and intending to be legally bound by this
Amendment, the Parties covenant and agree as follows:
AGREEMENTS
     1.01 Defined Terms. Capitalized terms used but not otherwise defined herein
shall have the meanings ascribed to such terms in the Agreement.
Amendment No. 5 to Participation Agreement
Effective: September 1, 2007
Vote Date: On September 21, 2007

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     1.02 Amendments. The Amended Agreement is hereby amended as follows:
     (a) In Section 3.05(b) of the Amended Agreement, the words “not later than
September 12, 2007” are hereby deleted and replaced with “on September 21,
2007”.
     1.03 Continuing Effect; Ratification. Except as expressly amended herein,
all other terms, covenants and conditions contained in the Amended Agreement
shall continue to remain unchanged and in full force and effect and are hereby
ratified and confirmed.
      1.04 Governing Law. This Amendment shall be interpreted and enforced in
accordance with the Laws of the State of South Dakota, notwithstanding any
conflict of law provision to the contrary.
     1.05 Captions. All titles, subject headings, section titles and similar
items are provided for the purpose of reference and convenience and are not
intended to affect the meaning of the content or scope of this Amendment.
     1.06 Counterparts. This Amendment may be executed in any number of
counterparts, each of which shall be deemed to be an original and all of which
together shall constitute but one and the same agreement. Counterpart signatures
may be delivered by facsimile or electronic transmission, each of which shall
have the same force and effect as an original signed copy.
     1.07 Authority. Each signatory to this Amendment represents that he/she has
the authority to execute and deliver this Amendment on behalf of the party set
forth above his/her signature.
[Signature pages follow.
The remainder of this page is intentionally blank.]
Amendment No. 5 to Participation Agreement
Effective: September 1, 2007
Vote Date: On September 21, 2007

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     IN WITNESS WHEREOF, the Parties have caused their names to be hereunto
subscribed by their officers thereunto duly authorized, intending thereby that
this Amendment shall be effective as of the date set forth above.
OWNERS:
CENTRAL MINNESOTA MUNICIPAL
POWER AGENCY

              By /s/ Bob Elston     Name:   Bob Elston     Title:   President   
 

[Signatures continued on next page.]
Amendment No. 5 to Participation Agreement
Effective: September 1, 2007
Vote Date: On September 21, 2007

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     IN WITNESS WHEREOF, the Parties have caused their names to be hereunto
subscribed by their officers thereunto duly authorized, intending thereby that
this Amendment shall be effective as of the date set forth above.
OWNERS:
HEARTLAND CONSUMERS POWER
DISTRICT

              By /s/ Mike McDowell     Name:   Mike McDowell    Title:   General
Manager     

[Signatures continued on next page.]
Amendment No. 5 to Participation Agreement
Effective: September 1, 2007
Vote Date: On September 21, 2007

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     IN WITNESS WHEREOF, the Parties have caused their names to be hereunto
subscribed by their officers thereunto duly authorized, intending thereby that
this Amendment shall be effective as of the date set forth above.
OWNERS:
SOUTHERN MINNESOTA MUNICIPAL
POWER AGENCY

              By /s/ Raymond A. Hayward     Name:   Raymond A. Hayward   
Title:   Executive Director & CEO     

[Signatures continued on next page.]
Amendment No. 5 to Participation Agreement
Effective: September 1, 2007
Vote Date: On September 21, 2007

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     IN WITNESS WHEREOF, the Parties have caused their names to be hereunto
subscribed by their officers thereunto duly authorized, intending thereby that
this Amendment shall be effective as of the date set forth above.
OWNERS:
WESTERN MINNESOTA MUNICIPAL
POWER AGENCY

              By /s/ Thomas J. Heller     Name:   Thomas J. Heller    Title:  
Asst. Secretary & Asst. Treasurer     

[Signatures continued on next page.]
Amendment No. 5 to Participation Agreement
Effective: September 1, 2007
Vote Date: On September 21, 2007

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     IN WITNESS WHEREOF, the Parties have caused their names to be hereunto
subscribed by their officers thereunto duly authorized, intending thereby that
this Amendment shall be effective as of the date set forth above.
OWNERS:
GREAT RIVER ENERGY

              By /s/ David Saggau     Name:   David Saggau    Title:   President
& CEO     

[Signatures continued on next page.]
Amendment No. 5 to Participation Agreement
Effective: September 1, 2007
Vote Date: On September 21, 2007

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     IN WITNESS WHEREOF, the Parties have caused their names to be hereunto
subscribed by their officers thereunto duly authorized, intending thereby that
this Amendment shall be effective as of the date set forth above.
OWNERS:
MONTANA-DAKOTA UTILITIES CO.,
a Division of MDU Resources Group, Inc.

              By /s/ Bruce Imsdahl     Name:   Bruce Imsdahl    Title:  
President & CEO     

[Signatures continued on next page.]
Amendment No. 5 to Participation Agreement
Effective: September 1, 2007
Vote Date: On September 21, 2007

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     IN WITNESS WHEREOF, the Parties have caused their names to be hereunto
subscribed by their officers thereunto duly authorized, intending thereby that
this Amendment shall be effective as of the date set forth above.
OWNERS:
OTTER TAIL CORPORATION
dba Otter Tail Power Company

              By /s/ Chuck MacFarlane     Name:   Chuck MacFarlane    Title:  
President     

Amendment No. 5 to Participation Agreement
Effective: September 1, 2007
Vote Date: On September 21, 2007

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