PROMISSORY NOTE Principal Loan Date Maturity Loan No Call / Coll Account Officer Initials $10,000,000.00 04-28-2009 01-05-2010 ###-###-#### 1A2 / 101 Krugeg References in the boxes above are for Lendersuse only and do not limit the applicability of this document to any particularloan or item. Any itemabove containing *** has been omitted due to text length limitations.

Exhibit 10.2

PROMISSORY NOTE

References in the boxes above are for Lender’s use only and do not limit the applicability of this document to any particular loan or item. Any item above containing “***” has been omitted due to text length limitations.

PROMISE TO PAY.  TOWER TECH SYSTEMS INC (“Borrower”) promises to pay to GREAT WESTERN BANK (“Lender”), or order, in lawful money of the United States of America, the principal amount of Ten Million & 00/100 Dollars ($10,000,000.00) or so much as may be outstanding, together with interest on the unpaid outstanding principal balance of each advance, calculated as described in the “INTEREST CALCULATION METHOD” paragraph using an interest rate of 7.500% per annum based on a year of 360 days. Interest shall be calculated from the date of each advance until repayment of each advance. The interest rate may change under the terms and conditions of the “INTEREST AFTER DEFAULT” section.

PAYMENT. Borrower will pay this loan in one payment of all outstanding principal plus all accrued unpaid interest on January 5, 2010. In addition, Borrower will pay regular monthly payments of all accrued unpaid interest due as of each payment date, beginning June 5, 2009, with all subsequent interest payments to be due on the same day of each month after that. Unless otherwise agreed or required by applicable law, payments will be applied first to any accrued unpaid interest; then to principal; then to any unpaid collection costs; and then to any late charges. Borrower will pay Lender at Lender’s address shown above or at such other place as Lender may designate in writing.

INTEREST CALCULATION METHOD. Interest on this Note is computed on a 365/360 basis; that is, by applying the ratio of the interest rate over a year of 360 days, multiplied by the outstanding principal balance, multiplied by the actual number of days the principal balance is outstanding. All interest payable under this Note is computed using this method.

PREPAYMENT; MINIMUM INTEREST CHARGE.  Borrower agrees that all loan fees and other prepaid finance charges are earned fully as of the date of the loan and will not be subject to refund upon early payment (whether voluntary or as a result of default), except as otherwise required by law.  In any event, even upon full prepayment of this Note, Borrower understands that Lender is entitled to a minimum interest charge of $75.00.  Other than Borrower’s obligation to pay any minimum interest charge, Borrower may pay without penalty all or a portion of the amount owed earlier than it is due. Early payments will not, unless agreed to by Lender in writing, relieve Borrower of Borrower’s obligation to continue to make payments of accrued unpaid interest.  Rather, early payments will reduce the principal balance due.  Borrower agrees not to send Lender payments marked “paid in full”, “without recourse”, or similar language.  If Borrower sends such a payment, Lender may accept it without losing any of Lender’s rights under this Note, and Borrower will remain obligated to pay any further amount owed to Lender. All written communications concerning disputed amounts, including any check or other payment instrument that indicates that the payment constitutes “payment in full” of the amount owed or that is tendered with other conditions or limitations or as full satisfaction of a disputed amount must be mailed or delivered to:  GREAT WESTERN BANK, 35 1st Ave NE Watertown, SD 57201.

LATE CHARGE. If a payment is 10 days or more late, Borrower will be charged 2.000% of the regularly scheduled payment or $25.00, whichever is greater.

INTEREST AFTER DEFAULT. Upon default, including failure to pay upon final maturity, the interest rate on this Note shall be increased to 20.000% per annum based on a year of 360 days.  However, in no event will the interest rate exceed the maximum interest rate limitations under applicable law.

DEFAULT.  Each of the following shall constitute an event of default (“Event of Default”) under this Note:

Payment Default. Borrower fails to make any payment when due under this Note.

Other Defaults. Borrower fails to comply with or to perform any other term, obligation, covenant or condition contained in this Note or in any of the related documents or to comply with or to perform any term, obligation, covenant or condition contained in any other agreement between Lender and Borrower.

False Statements. Any warranty, representation or statement made or furnished to Lender by Borrower or on Borrower’s behalf under this Note or the related documents is false or misleading in any material respect, either now or at the time made or furnished or becomes false or misleading at any time thereafter.

Insolvency. The dissolution or termination of Borrower’s existence as a going business, the insolvency of Borrower, the appointment of a receiver for any part of Borrower’s property, any assignment for the benefit of creditors, any type of creditor workout, or the commencement of any proceeding under any bankruptcy or insolvency laws by or against Borrower.

Creditor or Forfeiture Proceedings.  Commencement of foreclosure or forfeiture proceedings, whether by judicial proceeding, self-help, repossession or any other method, by any creditor of Borrower or by any governmental agency against any collateral securing the loan.  This includes a garnishment of any of Borrower’s accounts, including deposit accounts, with Lender.  However, this Event of Default shall not apply if there is a good faith dispute by Borrower as to the validity or reasonableness of the claim which is the basis of the creditor or forfeiture proceeding and if Borrower gives Lender written notice of the creditor or forfeiture proceeding and deposits with Lender monies or a surety bond for the creditor or forfeiture proceeding, in an amount determined by Lender, in its sole discretion, as being an adequate reserve or bond for the dispute.

Events Affecting Guarantor. Any of the preceding events occurs with respect to any Guarantor of any of the indebtedness or any Guarantor dies or becomes incompetent, or revokes or disputes the validity of, or liability under, any guaranty of the indebtedness evidenced by this Note.

Change In Ownership. Any change in ownership of twenty-five percent (25%) or more of the common stock of Borrower.

Adverse Change.  A material adverse change occurs in Borrower’s financial condition, or Lender believes the prospect of payment or performance of this Note is impaired.

Insecurity. Lender in good faith believes itself insecure.

Cure Provisions.  If any default, other than a default in payment is curable and if Borrower has not been given a notice of a breach of the same provision of this Note within the preceding twelve (12) months, it may be cured if Borrower, after receiving written notice from Lender demanding cure of such default: (1)  cures the default within fifteen (15) days; or (2)  if the cure requires more than fifteen (15) days, immediately initiates steps which Lender deems in Lender’s sole discretion to be sufficient to cure the default and thereafter continues and completes all reasonable and necessary steps sufficient to produce compliance as soon as reasonably practical.

LENDER’S RIGHTS.  Upon default, Lender may declare the entire unpaid principal balance under this Note and all accrued unpaid interest immediately due, and then Borrower will pay that amount.

ATTORNEYS’ FEES; EXPENSES.  Lender may hire or pay someone else to help collect this Note if Borrower does not pay.  Borrower will pay Lender that amount.  This includes, subject to any limits under applicable law, Lender’s attorneys’ fees and Lender’s legal expenses, whether or not there is a lawsuit, including attorneys’ fees, expenses for bankruptcy proceedings (including efforts to modify or vacate any automatic stay or injunction), and appeals.  If not prohibited by applicable law, Borrower also will pay any court costs, in addition to all other sums provided by law.

GOVERNING LAW. This Note will be governed by federal law applicable to Lender and, to the extent not preempted by federal law, the laws of the State of South Dakota without regard to its conflicts of law provisions. This Note has been accepted by Lender in the State of South Dakota.

CHOICE OF VENUE. If there is a lawsuit, Borrower agrees upon Lender’s request to submit to the jurisdiction of the courts of Minnehaha County, State of South Dakota.

RIGHT OF SETOFF.  To the extent permitted by applicable law, Lender reserves a right of setoff in all Borrower’s accounts with Lender (whether checking, savings, or some other account). This includes all accounts Borrower holds jointly with someone else and all accounts Borrower may open in the future.  However, this does not include any IRA or Keogh accounts, or any trust accounts for which setoff would be prohibited by law.  Borrower authorizes Lender, to the extent permitted by applicable law, to charge or setoff all sums owing on the indebtedness against any and all such accounts.

COLLATERAL.  Borrower acknowledges this Note is secured by A COLLATERAL REAL ESTATE MORTGAGE; COMMERCIAL SECURITY AGREMENT & AN ASSIGNMENT OF DEPOSIT ACCOUNT SAVINGS #1347401 FROM TOWER TECH SYSTEMS, INC TO GREAT WESTERN BANK DATED APRIL 28, 2009 AND A SUBORDINATION AGREEMENT BY AND BETWEEN GREAT WESTERN BANK AND BROADWIND ENERGY,  INC TO GREAT WESTERN BANK DATED APRIL 28, 2009 AND COMMERCIAL GUARANTY FROM BROADWIND ENERGY, INC TO GREAT WESTERN BANK.

LINE OF CREDIT.  This Note evidences a straight line of credit.  Once the total amount of principal has been advanced, Borrower is not entitled to further loan advances.  The following person or persons are authorized to request advances and authorize payments under the line of credit until Lender receives from Borrower, at Lender’s address shown above, written notice of revocation of such authority:  STEVE HUNTINGTON, CHIEF

PROMISSORY NOTE

(Continued)

FINANCIAL OFFICER of TOWER TECH SYSTEMS INC.  Borrower agrees to be liable for all sums either:  (A)  advanced in accordance with the instructions of an authorized person or (B) credited to any of Borrower’s accounts with Lender. The unpaid principal balance owing on this Note at any time may be evidenced by endorsements on this Note or by Lender’s internal records, including daily computer print-outs.

SUCCESSOR INTERESTS.  The terms of this Note shall be binding upon Borrower, and upon Borrower’s heirs, personal representatives, successors and assigns, and shall inure to the benefit of Lender and its successors and assigns.

NOTIFY US OF INACCURATE INFORMATION WE REPORT TO CONSUMER REPORTING AGENCIES.  Please notify us if we report any inaccurate information about your account(s) to a consumer reporting agency.  Your written notice describing the specific inaccuracy(ies) should be sent to us at the following address: GREAT WESTERN BANK 35 1st Ave NE Watertown, SD 57201.

GENERAL PROVISIONS. If any part of this Note cannot be enforced, this fact will not affect the rest of the Note. Lender may delay or forgo enforcing any of its rights or remedies under this Note without losing them. Borrower and any other person who signs, guarantees or endorses this Note, to the extent allowed by law, waive presentment, demand for payment, and notice of dishonor. Upon any change in the terms of this Note, and unless otherwise expressly stated in writing, no party who signs this Note, whether as maker, guarantor, accommodation maker or endorser, shall be released from liability. All such parties agree that Lender may renew or extend (repeatedly and for any length of time) this loan or release any party or guarantor or collateral; or impair, fail to realize upon or perfect Lender’s security interest in the collateral; and take any other action deemed necessary by Lender without the consent of or notice to anyone. All such parties also agree that Lender may modify this loan without the consent of or notice to anyone other than the party with whom the modification is made. The obligations under this Note are joint and several.

PRIOR TO SIGNING THIS NOTE, BORROWER READ AND UNDERSTOOD ALL THE PROVISIONS OF THIS NOTE. BORROWER AGREES TO THE TERMS OF THE NOTE.

BORROWER ACKNOWLEDGES RECEIPT OF A COMPLETED COPY OF THIS PROMISSORY NOTE.

BORROWER:

TOWER TECH SYSTEMS INC

LASER PRO Lending, Ver. 5.43.00.003 Copr. Harland Financial Solutions, Inc. 1997, 2009.  All Rights reserved. - SD o:\officers\apps\CFI\LPL\D20.FC TR-14454 PR-34

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