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Exhibit 10.20
 
 ENERGY MANAGEMENT AGREEMENT
(Single Site)
 Central Iowa Energy, LLC
 SCOPE OF SERVICES:
 PROJECT DESCRIPTION : 30 XX 0
 U.S. ENERGY RESPONSIBILITIES :
 Natural Gas Supply Management Services
 1.
    
    Invoice Review U.S. Energy will perform a detailed review of the monthly supply and
utility invoices to ensure accuracy for each of the Client facilities. U.S. Energy will
report any major discrepancies and pursue resolution of any incorrect invoices.2.
    
    Tariff Review Each facility will be evaluated to determine the most beneficial rate
structure available that best fits the Clients needs. In addition, U.S. Energy will
continue to monitor natural gas service tariffs to determine if new tariffs or changes to
the tariffs will have an impact on Client.3.
    
    Procurement of Supply to
Facilities U.S. Energy will determine the most
appropriate method of securing firm physical natural gas supplies to the facilities. A
determination as to whether U.S. Energy-transported, third party-transported, or gas
utility tariff sales supply will provide the most reliable and economic supply of natural
gas to the facilities will be made. Once determined, U.S. Energy will be responsible for
management and monitoring of all operations and agreements related to the natural gas
activities.4.
    
    Negotiation Services U.S. Energy will provide negotiation services to establish
transportation rates on interstate pipelines and gas utilities, contractual terms with
suppliers and transporters, lines of credit with suppliers, and new tariffs where
applicable with utilities.5.
    
    Energy Tax Exemption Analysis U.S. Energy will evaluate energy tax exemption
opportunities and if evidence proves an audit to be beneficial, with
Clients approval and payment, U.S. Energy will arrange for a third party energy tax
exemption audit.




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6.
    
    Gold + Web Site Access Gold+ is U.S. Energys password-protected web site that
allows clients access to their information. Gold+ access also makes available industry
news, hedging strategies and NYMEX pricing. In addition, various energy usage reports,
and other customized reports for Client will be available on the web page.
 Natural Gas Price Rick Management Servicesu
 1.
    
    Commodity Price Management U.S. Energy will review natural gas usage at all
facilities and make recommendations for managing natural gas commodity costs. An analysis
will be developed to help determine the amount of natural gas usage that should be
considered for this price management service. U.S. Energy will procure the fixed natural
gas price once Client agrees to a target gas price and quantity. U.S. Energy will provide
price risk management information several times a month through the following
communications:
 Weekly Update:  Monthly Pricing Letter:  Monthly Conference Call  Hedge Recommendations:  Annual Energy Conference:  Gold+ Web Site Access:
 Electric Supply Management Services
 1.
    
    Invoice Review U.S. Energy will perform a detailed review of the monthly supply and
utility invoices to ensure accuracy for each of the Client facilities. U.S. Energy will
report any major discrepancies and pursue resolution of any incorrect invoices.2.
    
    Tariff Review Each facility will be evaluated to determine the most beneficial rate
structure available that best fits the Clients needs. In addition, U.S. Energy will
continue to monitor electric tariffs to determine if new tariffs or changes to the tariffs
will have an impact on Client.3.
    
    Electric Procurement U.S. Energy will investigate the market conditions for third
party purchase of electricity in Clients specified locations as it becomes available. If
advantageous to Clients facilities, U.S. Energy will conduct procurements for those
facilities that have the ability to purchase energy from third-party suppliers. On an
annual basis or according to contract expiration dates, U.S. Energy will negotiate
directly with electric power suppliers to provide supply agreements for the Client
facilities. U.S. Energy will assist with the management and monitoring of these
agreements. U.S. Energy wil also
determine whether firm, interruptible, or a blend of services will provide the lowest cost.
As regulatory conditions change in each state, the electric procurement process will be
reevaluated to take advantage of the changes.
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4.
    
    Cost and Usage Analysis/Trending:U.S. Energy will archive the monthly electric
billing information in a database that will be used to analyze and trend electric costs
and usage. The reports will be available on U.S. Energys website for Client access.5.
    
    Load Profile U.S. Energy will trend interval load data if available, and help
identify potential areas for Client to target for demand and energy savings.6.
    
    Negotiation Services U.S. Energy will provide negotiation services to establish
electric rates with electric utilities, contractual terms with third party suppliers,
lines of credit with suppliers, and new tariffs where applicable with electric utlities.7.
    
    Energy Tax Exemption Analysis U.S. Energy will evaluate energy tax exemption
opportunities and if evidence proves an audit to be beneficial, with Clients approval and
payment, U.S. Energy will arrange for a third party energy tax exemption audit. U.S.
Energy will further utilize the results for tax exemption filings.8.
    
    Gold+ Web Site Access Gold+ is U.S. Energys password-protected web site that
allows clients access to their information. Gold+ access also makes available industry
news, hedging strategies and NYMEX pricing. In addition, various energy usage reports,
load profile reports and other customized reports for Client will be available on the web
page.
 AGENCY: Exhibit A
 FEES :
  TERM :
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BILLING AND PAYMENT :
 TAXES:
 CONFIDENTIALITY :
 NOTICES :
 Client:
    
    Derek WinkelGeneral ManagerCentral Iowa Energy, LLC3426 East 28th St. NNewton, IA 50208U.S. Energy:
    
    Bank: US Bank(Payment by wire)
    
    Account Name: U.S. Energy Services, Inc.Account #: 173100561153ABA: 091 0000 22
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(Notices):
    
    U.S. Energy Services, Inc.1000 Superior Blvd, Suite 201Wayzata, MN 55391Attn: Contract Administration
 ASSIGNMENT OR AMENDMENT :
 APPLICABLE LAW :
 ENTIRE AGREEMENT :
 Agreed to and Accepted by:
 Central Iowa Energy, LLC
 By:
    
    /s/ Derek WinkelName: Derek Winkel(Print)Title: General Manager
 Date: 6/8/07
 U.S. Energy Services, Inc.
 By:
    
    /s/Gail McMinnName: Gail McMinn(Print)Title: Executive Vice President  Commercial Services
 Date: 6/12/07
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EXHIBIT A  AGENCY AUTHORIZATION
   1.
    
    APPOINTMENT AND SCOPE Client hereby appoints U.S. Energy as its agent for managing Clients
energy supplies and to deal with third parties on behalf of Client, in connection with
energy-related matters, in U.S. Energys capacity as Clients agent, including, without
limitation, the purchase of energy resources in such quantity and at such times as Client may
authorize in writing, by electronic communications (e.g., by email), verbally or otherwise
(Energy Procurements). U.S. Energy is authorized to contract on behalf of Client for the
acquisition of energy supply, transportation and distribution. U.S. Energy hereby accepts
such appointment and agrees to use commercially reasonable efforts to perform the services
required by this Authorization.2.
    
    AUTHORITY OF U.S. ENERGY TO ALIGN CREDIT Client authorizes U.S. Energy, in making Energy
Procurements, to align credit from energy suppliers or third parties on behalf and as an agent
of Client, as needed.3.
    
    AUTHORITY OF U.S. ENERGY TO EXTEND CREDIT Client hereby agrees that when making Energy
Procurements on behalf of a Client, U.S. Energy may use U.S. Energy funds to pay suppliers,
thereby extending credit directly to Client (and acting as a Creditor, as that term is used
in this Authorization).4.
    
    TERM The term of this Authorization shall commence as of the date hereof and shall continue
indefinitely until such time as the parties hereto shall agree in writing to terminate the
Authorization.5.
    
    INDEPENDENT CONTRACTOR It is not the intent of the parties hereto to form any partnership
or joint venture relationship. Each party shall, in relation to its obligations hereunder,
act as an independent contractor.6.
    
    RELEASE OF ENERGY CONSUMPTION RECORDS AND BILLS This Agreement serves as authorization for
the release of Clients energy consumption records and bills from pipelines and suppliers to
U.S. Energy.7.
    
    AUTHORITY Each of Assignor and Assignee represents and warrants to the other that it is
fully empowered and authorized to execute and deliver this Assignment, and the individuals
signing this Assignment each represent and warrant that he or she is fully authorized to do
so.
 Agreed to and Accepted by:
 Central Iowa Energy, LLC
    
    
    
    U.S. Energy Services, Inc.By:
    
    /s/ Derek Winkel
    
    
    
    By:
    
    /s/ Gail McMinnPrint Name: Derek Winkel
    
    
    
    Print Name: Gail McMinnTitle: General Manager
    
    
    
    Title: EVP  Commercial ServicesDate: 6/8/07
    
    
    
    Date: 6/12/07