Exhibit 10.2
Teton Energy Corporation
410 17th Street, Suite 1850
Denver, CO 80202
September 19, 2008
To each Purchaser identified on the signature pages hereto

Re:   Teton Energy Corporation — Securities Purchase Agreement dated as of
June 9, 2008 (the “Purchase Agreement”)

Gentlemen:
     Reference is made to the Purchase Agreement, a copy of the form of which is
attached hereto as Exhibit A. Capitalized terms not otherwise defined in this
letter of amendment (“Letter Agreement”) have the respective meanings ascribed
to them in the Purchase Agreement.
     This Letter Agreement confirms our recent conversations.
     In consideration of the covenants set forth in this Letter Agreement and
for other good and valuable consideration, the receipt and sufficiency of which
is hereby acknowledged, the Company and holders holding at least 67% in interest
of the Securities then outstanding hereby agree pursuant to Section 5.5 of the
Purchase Agreement as follows:

  (a)   The definitions of the terms “Debentures” and “Transaction Documents”
set forth in Section 1.1 of the Purchase Agreement are hereby modified to read
as follows:         “Debentures” means the 10.75% Secured Convertible Debentures
due, subject to the terms therein, 5 years from their date of issuance, issued
by the Company to the Purchasers hereunder, in the form of Exhibit A attached
hereto and after the exchange described in Section 4.17(b) hereof, “Debentures”
shall mean the “Exchanged Debentures.”         “Transaction Documents” means
this Agreement, the Debentures, the Registration Rights Agreement, the Security
Agreement, the Intercreditor and Subordination Agreement, the Mortgages, all
exhibits and schedules thereto and hereto and any other documents or agreements
executed in connection with the transactions contemplated hereunder.”

 

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Letter Agreement
September 19, 2008
Page 2

  (b)   Section 4.5 of the Purchase Agreement is hereby modified to read as
follows:         “4.5 Conversion Procedures. Until the Debentures are exchanged
for Exchanged Debentures, the form of Notice of Conversion included in the
Debentures set forth the totality of the procedures required of the Purchasers
in order to convert the Debentures. No additional legal opinion, other
information or instructions shall be required of the Purchasers to convert their
Debentures. The company shall honor conversions of the Debentures and shall
deliver Underlying Shares in accordance with the terms, conditions and time
periods set forth in the Transaction Documents. After the exchange of Debentures
for Exchanged Debentures, the procedures required of the Purchasers in order to
convert the Exchanged Debentures shall be as set forth in the indenture pursuant
to which the Exchanged Debentures are issued.”     (c)   Section 4.18 of the
Purchase Agreement is hereby modified to read as follows:         “Appointment
of Subordinated Noteholder Representative. Each Purchaser hereby appoints The
Bank of New York Mellon Trust Company, N.A., as Subordinated Noteholder
Representative under the Security Documents and the other Transaction Documents,
with full authority to execute and deliver each of such agreements on behalf of
the Purchaser as such Purchaser’s attorney-in-fact for such purpose only, and to
have all rights, powers and indemnities of the Subordinated Noteholder
Representative as set forth therein.”     (d)   Section 5.4 of the Purchase
Agreement is hereby amended by adding at the end thereof the following sentence:
        “Upon the effectiveness of the appointment of The Bank of New York
Mellon Trust Company, N.A. as Subordinated Noteholder Representative, the
address for notices and communications to the Subordinated Noteholder
Representative shall be The Bank of New York Mellon Trust Company, N.A., 601
Travis Street, 18th Floor, Houston, Texas 77002, Attention: Corporate Trust
Services, re: Teton Energy Corporation or such other address as the Subordinated
Noteholder Representative may designate from time to time.”     (e)   The
Security Documents and the other Transaction Documents are hereby amended
mutatis mutandis to reflect the appointment of The Bank of New York Mellon Trust
Company, N.A. as Subordinated Noteholder Representative in accordance with the
terms of this Letter Agreement. To this end, the Subordinated

 

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Letter Agreement
September 19, 2008
Page 3

      Noteholder Representative is hereby authorized to execute and deliver on
behalf of each Purchaser revised agreements, which reflect amendments and other
modifications consistent with the provisions hereof, such as the substitution of
The Bank of New York Mellon Trust Company, N.A. for Whitebox Teton, Ltd. as
collateral agent for the Subordinated Holders under the Amended and Restated
Intercreditor and Subordination Agreement.

  (f)   Each party hereto (other than Whitebox Advisors, LLC and Whitebox Teton,
Ltd.) on behalf of itself and its successors and assigns hereby confirms that it
has no claims against Whitebox Advisors, LLC or Whitebox Teton, Ltd. under the
Security Documents or the other Transaction Documents, and to the extent there
arises any such claims, the affected party on behalf of itself and its
successors and assigns hereby forever waives and releases any liability that
Whitebox Advisors, LLC, Whitebox Teton, Ltd. or any of their respective
officers, directors, managers, employees, and other affiliates may have in
respect of any such claim that may be possessed by the affected party.     (g)  
This Letter Agreement shall be effective simultaneously with the execution and
delivery of that certain Secured Subordinated Convertible Debenture Indenture
among the Company, the Guarantors signatory thereto, and The Bank of New York
Mellon Trust Company, N.A. and the consummation of the transactions contemplated
thereby.

     Please confirm your agreement with the foregoing by signing a copy of this
Letter Agreement in the space indicated and by initialing the Exhibit attached
hereto and by returning the same to the undersigned.

 

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Letter Agreement
September 19, 2008
Page 4
     This Letter Agreement may be executed in counterparts.
Sincerely,

          TETON ENERGY CORPORATION
    By:   /s/ Lonnie R. Brock     Name:   Lonnie R. Brock     Title:   EVP & CFO
 

Address for Notice:
410 17th Street, Suite 1850
Denver, CO 80202
Fax: (303)565-4606
With a copy (which shall not constitute notice) to:
David Danovitch, Esq.
Gersten Savage LLP
600 Lexington Avenue
New York, NY 10022
Fax: (212) 980-5192
[REMAINDER OF PAGE INTENTIONALLY LEFT BLANK
SIGNATURE PAGE FOR PURCHASERS FOLLOWS]

 

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Letter Agreement
September 19, 2008
Page 5
READ, ACCEPTED AND AGREED TO:
[PURCHASER SIGNATURE PAGES TO TEC LETTER AGREEMENT]
     IN WITNESS WHEREOF, the undersigned have caused this Letter Agreement to be
duly executed by their respective authorized signatories as of the date first
indicated above.
Name of Purchaser:  Aristeia Partners, L.P.
Signature of Authorized Signatory of Purchaser:  /s/ Robert H. Lynch
Name of Authorized Signatory:  Robert H. Lynch
Title of Authorized Signatory:  Managing Member
Email Address of Authorized Signatory:  lynch@aristeiacapital.com
Facsimile Number of Authorized Signatory:  212-532-8712
Address for Notice of Purchaser:  c/o Aristeia Capital, LLC
136 Madison Ave, 3rd fl,
NY, NY 10016
Address for Delivery of Securities for Purchaser (if not same as address for
notice):  Goldman, Sachs & Co,
Global Securities Service - Prince Brokerage
One New York Plaza, 44th fl,
NY, NY 10004
Attn: Michael Park
Subscription Amount: 2,600,000
EIN Number: [PROVIDE THIS UNDER SEPARATE COVER]
[SIGNATURE PAGES CONTINUE]

 

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Letter Agreement
September 19, 2008
Page 5
READ, ACCEPTED AND AGREED TO:
[PURCHASER SIGNATURE PAGES TO TEC LETTER AGREEMENT]
     IN WITNESS WHEREOF, the undersigned have caused this Letter Agreement to be
duly executed by their respective authorized signatories as of the date first
indicated above.
Name of Purchaser:  Aristeia Special Investments Master, L.P.
Signature of Authorized Signatory of Purchaser:  /s/ Robert H. Lynch
Name of Authorized Signatory:  Robert H. Lynch
Title of Authorized Signatory:  Managing Member
Email Address of Authorized Signatory:  lynch@aristeiacapital.com
Facsimile Number of Authorized Signatory:  212-532-8712
Address for Notice of Purchaser:  c/o Aristeia Capital, LLC
136 Madison Ave, 3rd fl,
NY, NY 10016
Address for Delivery of Securities for Purchaser (if not same as address for
notice):  Goldman, Sachs & Co
Global Securities Services - Prince Brokerage
One New York Plaza, 44th fl,
NY, NY 10004
Attn: Michael Park
Subscription Amount: 400,000
EIN Number: [PROVIDE THIS UNDER SEPARATE COVER]
[SIGNATURE PAGES CONTINUE]

 

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Letter Agreement
September 19, 2008
Page 5
READ, ACCEPTED AND AGREED TO:
[PURCHASER SIGNATURE PAGES TO TEC LETTER AGREEMENT]
     IN WITNESS WHEREOF, the undersigned have caused this Letter Agreement to be
duly executed by their respective authorized signatories as of the date first
indicated above.
Name of Purchaser:  Aristeia International Limited
Signature of Authorized Signatory of Purchaser:  /s/ Robert H. Lynch
Name of Authorized Signatory:  Robert H. Lynch
Title of Authorized Signatory:  Managing Member
Email Address of Authorized Signatory:  lynch@aristeiacapital.com
Facsimile Number of Authorized Signatory:  212-532-8712
Address for Notice of Purchaser:  c/o Aristeia Capital, LLC
136 Madison Ave, 3rd fl,
NY, NY 10016
Address for Delivery of Securities for Purchaser (if not same as address for
notice):  Goldman, Sachs & Co
Global Securities Services - Prince Brokerage
One New York Plaza, 44th fl,
NY, NY 10004
Attn: Michael Park
Subscription Amount: $2,000,000
EIN Number: [PROVIDE THIS UNDER SEPARATE COVER]
[SIGNATURE PAGES CONTINUE]

 

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Letter Agreement
September 19, 2008
Page 5
READ, ACCEPTED AND AGREED TO:
[PURCHASER SIGNATURE PAGES TO TEC LETTER AGREEMENT]
     IN WITNESS WHEREOF, the undersigned have caused this Letter Agreement to be
duly executed by their respective authorized signatories as of the date first
indicated above.
Name of Purchaser:  Interlachen Convertible Investments Limited
Interlachen Convertible Investments Limited
By: Interlachen Capital Group, LP.
        Authorized Signatory
Signature of Authorized Signatory of Purchaser:  /s/ Gregg T. Colburn
Name of Authorized Signatory:  Gregg T. Colburn
Authorized Signatory
Title of Authorized
Signatory:_____________________________________________________________
Email Address of Authorized Signatory:  gcolburn@interlachencapital.com and
legal@interlachencapital.com
Facsimile Number of Authorized Signatory:  612-659-4457 or 612-659-4401
Address for Notice of Purchaser:  c/o Interlachen Capital Group LP
800 Nicollet Mall, Suite 2500, Minneapolis, MN 55402
Address for Delivery of Securities for Purchaser (if not same as address for
notice):
Subscription Amount: 5,250,000
EIN Number: [PROVIDE THIS UNDER SEPARATE COVER]
[SIGNATURE PAGES CONTINUE]

 

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Letter Agreement
September 19, 2008
Page 5
READ, ACCEPTED AND AGREED TO:
[PURCHASER SIGNATURE PAGES TO TEC LETTER AGREEMENT]
     IN WITNESS WHEREOF, the undersigned have caused this Letter Agreement to be
duly executed by their respective authorized signatories as of the date first
indicated above.
Name of Purchaser:  Ironman PI Fund (QP) LP
Signature of Authorized Signatory of Purchaser:  /s/ Gerald Dutt
Name of Authorized Signatory:  Gerald Dutt
Title of Authorized Signatory:  Managing Director
Email Address of Authorized Signatory:  bdutt@ironmanenergycapital.com
Facsimile Number of Authorized Signatory:
 _______________________________________
Address for Notice of Purchaser:  
Address for Delivery of Securities for Purchaser (if not same as address for
notice):
Subscription Amount: $1,000,000
EIN Number: [PROVIDE THIS UNDER SEPARATE COVER]
[SIGNATURE PAGES CONTINUE]

 

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Letter Agreement
September 19, 2008
Page 5
READ, ACCEPTED AND AGREED TO:
[PURCHASER SIGNATURE PAGES TO TEC LETTER AGREEMENT]
     IN WITNESS WHEREOF, the undersigned have caused this Letter Agreement to be
duly executed by their respective authorized signatories as of the date first
indicated above.
Name of Purchaser:  UBS O’Conner LLC FBO O’Conner Global Convertible Arbitrage
Master Limited
Signature of Authorized Signatory of Purchaser:  /s/ Andrew Martin
Name of Authorized Signatory:  Andrew Martin
Title of Authorized Signatory:  Managing Director
Email Address of Authorized Signatory:  andy.martin@ubs.com
Facsimile Number of Authorized Signatory:  212-821-6534
Address for Notice of Purchaser:  c/o UBS O’Conner LLC
One North Wacker Drive, 32nd fl, Chicago, IL 60606
Attn: Jeff Richmond
312-525-5839
Address for Delivery of Securities for Purchaser (if not same as address for
notice):
Subscription Amount: 3,375,000 pa (post Sept 08 put)
EIN Number: [PROVIDE THIS UNDER SEPARATE COVER]
[SIGNATURE PAGES CONTINUE]

 

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Letter Agreement
September 19, 2008
Page 5
READ, ACCEPTED AND AGREED TO:
[PURCHASER SIGNATURE PAGES TO TEC LETTER AGREEMENT]
     IN WITNESS WHEREOF, the undersigned have caused this Letter Agreement to be
duly executed by their respective authorized signatories as of the date first
indicated above.
Name of Purchaser:  UBS O’Conner LLC FBO O’Conner Global Convertible Arbitrage
II Master Limited
Signature of Authorized Signatory of Purchaser:  /s/ Andrew Martin
Name of Authorized Signatory:  Andrew Martin
Title of Authorized Signatory:  Managing Director
Email Address of Authorized Signatory:  andy.martin@ubs.com
Facsimile Number of Authorized Signatory:  212-821-6534
Address for Notice of Purchaser:  c/o UBS O’Conner LLC
One North Wacker Drive, 32nd fl, Chicago, IL 60606
Attn: Jeff Richmond
312-525-5839
Address for Delivery of Securities for Purchaser (if not same as address for
notice):
Subscription Amount: 375,000 pa. (post Sept 08 put)
EIN Number: [PROVIDE THIS UNDER SEPARATE COVER]
[SIGNATURE PAGES CONTINUE]

 

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Letter Agreement
September 19, 2008
Page 5
READ, ACCEPTED AND AGREED TO:
[PURCHASER SIGNATURE PAGES TO TEC LETTER AGREEMENT]
     IN WITNESS WHEREOF, the undersigned have caused this Letter Agreement to be
duly executed by their respective authorized signatories as of the date first
indicated above.
Name of Purchaser:  UBS O’Conner LLC FBO O’Conner Pipes Corporate Strategies
Master Limited
Signature of Authorized Signatory of Purchaser:  /s/ Andrew Martin
Name of Authorized Signatory:  Andrew Martin
Title of Authorized Signatory:  Managing Director
Email Address of Authorized Signatory:  andy.martin@ubs.com
Facsimile Number of Authorized Signatory:  212-821-6534
Address for Notice of Purchaser:  c/o UBS O’Conner LLC
One North Wacker Drive, 32nd fl, Chicago, IL 60606
Attn: Jeff Richmond
312-525-5839
Address for Delivery of Securities for Purchaser (if not same as address for
notice):
Subscription Amount: 750,000 p.a. (post Sept 08 put)
EIN Number: [PROVIDE THIS UNDER SEPARATE COVER]
[SIGNATURE PAGES CONTINUE]

 

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Letter Agreement
September 19, 2008
Page 5
READ, ACCEPTED AND AGREED TO:
[PURCHASER SIGNATURE PAGES TO TEC LETTER AGREEMENT]
     IN WITNESS WHEREOF, the undersigned have caused this Letter Agreement to be
duly executed by their respective authorized signatories as of the date first
indicated above.
Name of Purchaser:  Whitebox Toton, Ltd.
Signature of Authorized Signatory of Purchaser:  /s/ Jonathan Wood
Name of Authorized Signatory:  Jonathan Wood
Title of Authorized Signatory:  Director COO
Email Address of Authorized Signatory:  jwood@whiteboxadvisors.com
Facsimile Number of Authorized Signatory:  612-253-6114
Address for Notice of Purchaser:  c/o Whitebox Advisors, LLC
3033 Excelsior Blvd, Suite 300, Minneopolis, MN 55416-4675
Address for Delivery of Securities for Purchaser (if not same as address for
notice): Same as above
Subscription Amount: 21,000,000
EIN Number: [PROVIDE THIS UNDER SEPARATE COVER]
[SIGNATURE PAGES CONTINUE]

 

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EXHIBIT A
SECURITIES PURCHASE AGREEMENT