Exhibit
    10.10
  Base
    Contract for Sale and Purchase of Natural Gas
    Tenaska Marketing Ventures

and

Ultra Resources, Inc.  Houston, TX 7706011718 Nicholas Street Omaha, NE 68154



363 North Sam Houston Parkway East, Suite 1200Duns Number:
    62-424-0628



Duns Number: 07-110-9974Contract Number: TMV-S-1495 & TMV-P-1353



Contract
    Number: ­
    ­U.S. Federal Tax ID Number:
    47-0741451



U.S. Federal Tax ID Number: 83-0320643Notices:11718 Nicholas Street Omaha, NE 68164



Address  Same as aboveAttn: Manager, Contract Administration



Attn: Natural Gas Marketing  Contract AdministrationPhone:
    402-758-6266     Fax:
    402-758-6250



Phone: 281-876-0120 Ext. 306 Fax: 281-876-2831Confirmations:11718 Nicholas Street Omaha, NE 68154



Address  Same as aboveAttn: Contract Administration



Attn: Natural Gas Marketing  Gas ControlPhone: 402-758-6100     Fax:
    402-758-6250



Phone: 281-876-0120 Ext. 305 Fax: 281-876-2831Invoices and Payments:11718 Nicholas Street Omaha, NE 68154



Address  Same as aboveAttn: Gas Accounting



Attn: Natural Gas Marketing  Contract AdministrationPhone:
    402-758-6259     Fax:
    402-758-6253



Phone: 281-876-0120 Ext. 306 Fax: 281-876-2831Wire Transfer or ACH Numbers (if applicable):BANK:
    ­
    ­



BANK:
    ­
    ­ABA:
    ­
    ­



ABA:
    ­
    ­ACCT:
    ­
    ­



ACCT:
    ­
    ­Other
    Details: ­
    ­



Other Details: For the acct. of Ultra Resources. Inc.   Select only one box from each section:
  Section 1.2

x

Oral (default)

Section 7.2

x

25th

    Day of Month followingTransaction

o

Written

Payment Date



Month of delivery (default)Procedure







o

Day of Month following Month of deliverySection 2.5Confirm Deadline

xo

2 Business Days after receipt (default)  Business Days after receipt

Section 7.2Method of Payment

xo

Wire transfer (default)Automated Clearinghouse Credit (ACH)o

CheckSection 2.6

o

Seller (default)

Section 7.7

x

Netting applies (default)Confirming Party

o

Buyer

Netting

o

Netting does not applyx

Tenaska Marketing VenturesSection 3.2

x

Cover Standard (default)

Section 10.3.1

x

Early Termination Damages Apply (default)Performance
    Obligation

o

Spot Price Standard

Early Termination
    Damages

o

Early Termination Damages Do Not ApplySection 10.3.2

x

Other Agreement Setoffs Apply (default)Note: The following Spot Price Publication applies to both
    of the immediately preceding.

Other Agreement Setoffs

o

Other Agreement Setoffs Do Not ApplySection 2.26

x

Gas Daily Midpoint (default)

Section 14.5Spot Price
    Publication

o



Choice Of Law



New YorkSection 6

x

Buyer Pays At and After Delivery Point (default)

Section 14.10

x

Confidentiality applies (default)Taxes

o

Seller Pays Before and At Delivery Point

Confidentiality

o

Confidentiality does not applySpecial Provisions Number of sheets attached: TWO (2)Addendum(s): ­
    ­     TENASKA MARKETING VENTURES

ULTRA RESOURCES, INC.Party Name

Party Name   By: Tenaska Marketing, Inc, Managing General PartnerBy -s- Fred R. Hunzeker

By -s- Stuart E. NanceName: Fred R. Hunzeker

Name: Stuart E. NanceTitle: President

Title: Director  Oil & Gas Marketing
    Attorney-in-fact    Copyright
    ©

    2002 North American Energy Standards Board, Inc.
    NAESB Standard 6.3.1 All
    Rights Reserved
    April 19, 2002