FIRST AMENDMENT TO COTEAU LIGNITE SALES AGREEMENT

THIS FIRST AMENDMENT TO COTEAU LIGNITE SALES AGREEMENT ("Amendment") dated as of June 1, 1994, is by and between THE COTEAU PROPERTIES COMPANY, an Ohio corporation authorized to do business in the State of North Dakota (Coteau) and DAKOTA COAL COMPANY, a North Dakota corporation (Dakota).

WHEREAS, Coteau and Dakota are parties to the Coteau Lignite Sales Agreement dated as of January 1, 1990 (the Coteau Lignite Sales Agreement); and

WHEREAS, the Parties desire to amend the Coteau Lignite Sales Agreement in certain respects;

NOW, THEREFORE, in consideration of the foregoing and the mutual covenants and agreements contained herein, the Parties agree as follows:

1.All capitalized terms used in this Amendment shall have the meanings ascribed to them in the Coteau Lignite Sales Agreement unless such terms are otherwise defined herein, or unless the context clearly otherwise requires.

2.Section 1.1 of the Coteau Lignite Sales Agreement hereby is amended by adding the following definition after the definition of the term ANG:

Antelope Valley shall mean the Antelope Valley Station, consisting of two 450 MW generating units named "Unit 1" and "Unit 2", located at a site adjacent to Great Plains near Beulah, North Dakota, and which is controlled and operated by Basin Electric.

3.Section 1.1 of the Coteau Lignite Sales Agreement hereby is amended by adding the

following definition after the definition of the term Dakota:

Dakota Option Agreement shall mean the Dakota Option Agreement dated January 1, 1992 by and among Coteau, Dakota and the State of North Dakota doing business as the Bank of North Dakota (as escrow agent).

4.The definitions of the terms Dakota's Other Plants and Dakota's Primary Plants in

Section 1.1 of the Coteau Lignite Sales Agreement hereby are amended to read in their entirety as

follows:

Dakota's Other Plants shall mean all additional generating units installed by Basin Electric that increase the original generating capacity of Antelope Valley and all additional gasifiers as well as the incremental increased capacity achieved by replacing one or more of the existing gasifiers with a replacement gasifier having a capacity greater than that of the gasifier being replaced at or near Great Plains.

Dakota's Primary Plants shall mean collectively Antelope Valley and Great Plans.

5.Section 1.1 of the Coteau Lignite Sales Agreement hereby is amended by adding the following definition after the definition of the term Escrowed Stock:

GAAP shall mean generally accepted accounting principles.

6.Section 1.1 of the Coteau Lignite Sales Agreement hereby is amended by adding the

following definition after the definition of the term Glenharold Mine:

Great Plains shall mean the Great Plains Coal Gasification Plant, the first phase of which consists of a Lurgi lignite gasification facility with the capability of producing approximately 175 MMSCF/D of pipeline quality synthetic natural gas and is located on a site adjacent to Antelope Valley near Beulah, No4th Dakota, which is owned and operated by DGC.

7.The definition of the term Index in Section 1.1 of the Coteau Lignite Sales Agreement hereby is amended to read in its entirety as follows:

Index shall mean the average Producer Price Index - All Commodities on the base 1982 = 100, published by the Bureau of Labor Statistics of the U.S. Department of Labor, for the months of January through November of said calendar year. The base for calculating changes in the Index in Subsections 5.5(a), 5.5(b) and 5.5(c) hereof shall be the Producer Price Index - All Commodities for July 1988.

8.The fifth paragraph of Section 4.10 of the Coteau Lignite Sales Agreement hereby is

amended to read in its entirety as follows:

Coteau shall develop formal written policies with respect to donations to charitable and civic organizations and corporate sponsorships, which policies shall be subject to approval by Dakota. All expenditures by Coteau for donations and sponsorships that are included in the cost of Production shall be subject to approval by Dakota.

9.Section 5.2(a) of the Coteau Lignite Sales Agreement hereby is amended by deleting

clauses (xiv) and (xv) in their entirety and adding the following in lieu thereof:

10.Subsection 5.4(a) of the Coteau Lignite Sales Agreement hereby is amended to read in

its entirety as follows:

ii) For lignite sold and delivered hereunder in any calendar year between January 1, 1994 and December 31, 2006 for use at Antelope Valley, the Agreed Profit, expressed in July 1, 1988 dollars, shall be [* * *] per Ton for all Tons of lignite until the total quantity of lignite delivered to all of Dakota's Primary Plants equals [* * *] Tons for such year and thereafter shall be [* * *] per Ton for all Tons in excess of [* * *] Tons sold and delivered to Dakota's Primary Plants in such year, which such amounts of Agreed Profit shall be subject to adjustment as provided in Subsection 5.5(a) hereof. Notwithstanding the foregoing sentence, if Great Plains permanently and completely ceases production of

synthetic natural gas on or before December 31, 1997, then for a period of two (2) years following the date on which Great Plains so ceases such production, the Agreed Profit

for lignite sold and delivered hereunder for use at Antelope Valley, after adjustment pursuant to Subsection 5.5 (a) hereof, shall be reduced by [* * *] per Ton, which amount of reduction shall not be subject to any adjustment. If Great Plains permanently and completely ceases production of synthetic natural gas after December 31, 1997, then the Agreed Profit for Lignite sold and delivered hereunder for use at Antelope Valley, after adjustment pursuant to Subsection 5.5(a) hereof, shall not be reduced thereafter by the [* * *].

iii) For lignite sold and delivered hereunder in any calendar year between January 1, 1994 and December 31, 2006 for use at Great Plains, the Agreed Profit, expressed in July 1, 1988 dollars, shall be [* * *] per Ton, which such amount of Agreed Profit shall be subject to adjustment as provided in Subsection 5.5(a) hereof and after such adjustment shall be reduced by [* * *] per Ton, which amount of reduction shall not be subject to any adjustment.

iv) For the first [* * *] Tons of lignite sold and delivered from the Dedicated Lignite for use at Dakota's Primary Plants following December 31, 1989, the Agreed Profit per Ton, after adjustment pursuant to Subsection 5.5(a) hereof, shall be reduced by an amount equal to [* * *] adjusted in the manner as provided in paragraph 7 of the Coal Reserve Agreement. An example of the aforesaid calculation is attached hereto as Exhibit c and made a part hereof.

11.The references to Subsection 5.4 (a) that are contained in Subsections 5.4(b) and 5.4(c) hereby are amended to mean and refer to Subsection 5.4(a) (i). In addition, the second reference to Subsection 5.4(a) that is contained in clause (i) of Subsection 5.7(a) hereby is amended to mean and refer to Subsection 5.4(a) (i).

12.Section 5.6 of the Coteau Lignite Sales Agreement hereby is amended to read in its entirety

as follows:

Section 5.6    Further Modifications.

If at any time during the term of this Agreement it is reasonably believed by either Party that the [* * *] or any index substituted therefor in accordance with the following provisions no longer reflects the true change in purchasing power of the United States dollar, then upon the written request of either Party a substituted index or method whereby such change in purchasing power of the United States dollar can be determined shall be substituted by mutual agreement. In the event that the [* * *] * * * Confidential Treatment Requested

or any substituted index is changed in the future to use some base other than the base of 1982 = 100, then, for the purposes hereof, the [* * *] or any substitute index, as the case may be, shall be adjusted so as to be in correct relationship to the base of 1982 = 100, or some other alternative base which is mutually agreeable to Coteau and Dakota. In the event publication of the [* * *]

or any substituted index is no longer made by any federal agency, the index to be used as aforesaid shall be that index agreed to by the Parties which, after necessary adjustment, if any, provides the most reasonable substitute for said index.

13.Exhibits C, D, E and F hereto hereby are substituted for Exhibits C, D, E and F to the Coteau Lignite Sales Agreement, respectively, each of which shall be of no further force or effect.

14.Section 13.2 of the Coteau Lignite Sales Agreement hereby is amended to read in its

entirety as follows:

Section 13.2    Other Activities.

Notwithstanding the provisions of Section 13.1 hereof, it is contemplated that Coteau may provide other services to Dakota or its Affiliates such as solid waste disposal, disposal of excess lignite fines, snow removal as well as such other services, in each instance as may be mutually agreed upon by Coteau and Dakota. It is further contemplated that Coteau shall provide such services to Dakota or its Affiliates at a price agreed to by the Parties.

15.Section 14.1 of the Coteau Lignite Sales Agreement hereby is amended to read in its

entirety as follows: Section 14.1 Term.

* * * Confidential Treatment Requested

16.Section 14.4 of the Coteau Lignite Sales Agreement hereby is amended to read in its entirety as follows:

Section 14.4    Exercise of Option of Escrowed Stock.

17.Article XIV of the Coteau Lignite Sales Agreement hereby is amended by adding a new Section 14.5 thereto, which shall read in its entirety as follows:

On January 1, 1990, the effective date of this Agreement, GAAP required Coteau to follow Accounting Principles Board Opinion No. 11, entitled "Accounting for Income Taxes” ("APB 11"), or Statement of Financial Accounting Standard No. 96, entitled "Accounting for Income Taxes" ("SFAS 96"). Coteau did not adopt SFAS 96, and no further reference to SFAS 96 is either intended or implied herein. For fiscal years commencing after December 15, 1992, GAAP have required Coteau to adopt Statement of Financial Accounting Standard No. 109, entitled "Accounting for Income Taxes" ("SFAS 109"), which supersedes APB 11. Under SFAS 109, because of the difference between the financial statement and income tax basis of its assets and its liabilities, Coteau is required to record additional net deferred tax liabilities (“ADTL") on its financial statements for certain years that it was not required to record under APB 11. The amount of the ADTL will decrease with time. If Coteau continues in operation for a sufficient period of time, Coteau will not have to pay any portion of the ADTL and may be required to record additional net deferred tax assets ("ADTA") on its financial statements for certain years that it would not be required to record under APB 11.

So long as GAAP requires that ADTL continue to be recorded on Coteau's financial statements, the amount of dividends Coteau is able to pay under Section 4.8 hereof will be reduced, because the amount of the ADTL will reduce the earned surplus from which such dividends may be paid. Accordingly, the Parties agree that if this Agreement terminates and/or if the Escrowed Stock is transferred to Dakota for any reason, then in addition to any other payments by Dakota to North American Coal provided for in this Agreement, the Option Agreement and/or the Dakota Option Agreement, Dakota shall pay to North American Coal an amount equal to the difference between (x) the amount of net deferred tax liabilities recorded on Coteau's financial statements on the date the Escrowed stock is transferred to Dakota and (y) the amount of net deferred tax liabilities that Coteau would have recorded on such date if Coteau had determined such liabilities by the method it used prior to its required adoption of SFAS 109. Under no circumstances shall the amount of the payment by Dakota under this Subsection 14.5 exceed the total Agreed Profit paid to Coteau since its adoption of SFAS 109 less the sum of (i) the dividends paid by Coteau since its adoption of SFAS 109, (ii) the income tax payments made by Coteau with respect to years for which SFAS 109 was adopted, and (iii) the net deferred tax liabilities that would be payable by Coteau following the transfer of the Escrowed Stock in respect of its prior mining operations, if such deferred taxes were determined by the method Coteau used prior to its required adoption of SFAS 109, so long as GAAP requires that ADTA continue to be recorded on Coteau's financial statements, the amount of dividends Coteau is able to pay under Section 4 hereof will be increased by the amount of the ADTA. Accordingly, the Parties agree that if this Agreement terminates and/or if the Escrowed Stock is transferred to Dakota for any reason, then Coteau shall retain as an asset, and North American Coal shall not cause or permit Coteau to distribute to it as a dividend, an amount equal to the difference between (X) the amount of net deferred tax assets recorded on Coteau's financial statements

on the date the Escrowed Stock is transferred to Dakota and (y) the amount of net deferred tax assets that Coteau would have recorded on such date if Coteau had determined such assets in accordance with SFAS 109. Article XV of the Coteau Lignite Sales Agreement and all references thereto in the Coteau Lignite Sales Agreement hereby are deleted in their entirety effective as of June 1, 1994. Section 16.15 of the Coteau Lignite Sales Agreement hereby is deleted in its entirety effective as of January 1, 1990. All of the other terms and provisions of the Coteau Lignite Sales Agreement not expressly amended hereby shall continue and remain in full force and effect. 21. This Amendment may be executed in any number of counterparts, each of which, when executed and delivered, shall be an original, but all of which shall collectively constitute one and the same instrument.

IN WITNESS WHEREOF, the Parties have caused this Amendment to be executed on their behalf by their respective authorized representatives as of the day first written above.