ADVANCED BIOENERGY, LLC SUBSCRIPTION AGREEMENT Limited Liability Company Membership Units $1.50 per Unit Minimum Investment of 6,666 Units ($10,000) 666 Unit Increments Thereafter ($1,000)

A.

SUBSCRIBER INFORMATION. Please print your individual or entity name and address. Joint subscribers should provide their respective names. Your name and address will be recorded exactly as printed below.

ENTITIES:

Hawkeye Energy Holdings. LLC

Name of Entity (Please Print)

224 S. Bell Ave.

Ames, IA 50010

Attention: Timothy B. Callahan
Street Address

(515) 233-5405

Telephone

(515) 233-5577

Facsimile

Email Address

B.

NUMBER OF UNITS PURCHASED. The minimum participation is $10,000. We may lower the minimum purchase requirement for certain investors at our discretion. Additional units must be purchased in $1,000 unit increments. We presently have 12,651,962 units outstanding. The maximum number of units to be sold in this offering is 4,666,666.

Number of Units Requested to Be Purchased: 2,200,000

1.

Total Purchase Price
($1.50 per unit multiplied by the number of units to be purchased indicated in Item B above)

$3,300,000

1.

Complete all information required in this Subscription Agreement, and date and sign the Subscription Agreement and the Member Signature Page Addenda to our Third Amended and Restated Operating Agreement attached as Exhibit B to the Memorandum . A copy of the Subscription Agreement and the Member Signature Page Addenda for you to return to the Company has been enclosed.

2.

Immediately provide your personal or business check for the entire investment amount made payable to “Advanced BioEnergy, LLC.” You will determine this amount in Item C.2 of this Subscription Agreement.

3.

Deliver each of the original executed documents referenced in Items 1 and 2 of these instructions, together with your personal or business check described in Item 2 of these instructions, to the following:

4.

Until confirmation by Advanced BioEnergy of your subscription contemplated hereby and the acceptance by Advanced BioEnergy of the subscription contemplated hereby, this instrument shall be deemed an offer to subscribe for units and shall be non-binding on the undersigned and the undersigned may revoke for any reason, by delivering written notice to Advanced BioEnergy, this subscription. Upon acceptance by Advanced BioEnergy of your offer to subscribe, your subscription will become irrevocable and Advanced BioEnergy will deposit your check and deliver to you a copy of your completed Subscription Agreement signed by Advanced BioEnergy. Any request received from a subscriber for a withdrawal of his, her or its subscription prior to acceptance by Advanced BioEnergy will be honored, and the subscriber’s check for the subscription amount will be immediately returned (without interest).

5.

Upon acceptance of your subscription by Advanced BioEnergy, your funds will be placed in Advanced BioEnergy’s escrow account. The funds will be released to Advanced BioEnergy or returned to you in accordance with the arrangements described in the Memorandum. Advanced BioEnergy may, in its sole discretion, reject or accept any part or all of your subscription at any time. If Advanced BioEnergy rejects your subscription, your Subscription Agreement and check will be promptly returned to you, without interest. Advanced BioEnergy may not consider the acceptance or rejection of your subscription until a future date near the end of this offering.