As
      of
      ___________, 2008

     

    Renewable
      Energy Acquisition Corp.

    7078
      East
      Fish Lake Road, Suite 800

    Minneapolis,
      MN 55311

    


    Crusader
      Securities, Inc.

    230
      Park
      Avenue, Suite 1000

    New
      York,
      NY 10169

    


    
      	
            	Re:	
              Renewable
                Energy Acquisition Corp.

            


      	 	 	Initial Public
              Offering


    

     

    Ladies
      and Gentlemen: 

    


    The
      undersigned shareholder, officer and director of Renewable Energy Acquisition
      Corp. (the “Company”), in consideration of Crusader Securities, Inc. (the
“Underwriter”) underwriting the initial public offering of the securities of the
      Company (“IPO”), hereby agrees as follows (certain capitalized terms used herein
      are defined in paragraph 11 hereof): 

    


    1. If
      the
      Company solicits approval by its stockholders of a Business Combination, the
      undersigned will vote (i) all Insider Shares owned by him in accordance with
      the
      majority of the votes cast by the holders of the IPO Shares, and (ii) all other
      shares of common stock of the Company then owned by him, whether purchased
      in or
      after the IPO, in accordance with the majority of the votes cast by the holders
      of the IPO Shares. The undersigned acknowledges and agrees that he will not
      be
      entitled to exercise the conversion rights offered to the Company’s public
      stockholders as to any other shares of common stock owned by him. 

    


    2. In
      the
      event that the Company fails to consummate a Business Combination within 18
      months from the closing date (“Closing Date”) of the Company’s IPO described in
      the registration statement on Form SB-2, File No. 333-__________ (the
“Registration Statement”) (or 24 months under the circumstances described in the
      Registration Statement), the undersigned (i) will take all reasonable actions
      within his power to cause the Company to liquidate as soon as reasonably
      practicable, (ii) waives any and all right, title, interest or claim of any
      kind
      in or to any liquidating distributions by the Company, including, without
      limitation, any distribution of the assets from the trust account established
      under the Investment Management Trust Agreement dated as of __________________,
      2007, between the Company and _____________________ (the “Trust Account”) as a
      result of such liquidation with respect to his Insider Shares (“Claim”), (iii)
      waives any Claim the undersigned may have in the future as a result of, or
      arising out of, any contracts or agreements with the Company except as and
      to
      the extent an agreement is otherwise disclosed in the Company’s registration
      statement relating to the IPO and described in paragraph 5 below, and (iv)
      will
      not seek recourse against the Trust Account for any reason whatsoever.


     

    
      
         

      

      
         

        
          

        

      

      
         

      

    

    


    3. In
      order
      to minimize potential conflicts of interest which may arise from multiple
      affiliations, the undersigned agrees that in the event he becomes aware of,
      or
      involved with, (i) any business combination opportunities in the renewable
      energy industry or the environmental industry with
      a
      fair market value of $4.0 million or more or (ii) transactions such as joint
      ventures, partnerships or technology acquisition opportunities in the
renewable
      energy industry or the environmental industry with
      a
      fair market value of $4.0 million or more, the undersigned will first offer
      such
      business opportunities to the Company and further agrees that neither he nor
      any
      affiliate of the undersigned will pursue such opportunities unless and until
      the
      Company’s board of directors determines that it will not pursue such
      opportunities (the “Company’s Right of First Refusal”). The Company’s Right of
      First Refusal will terminate on the earlier of (x) the consummation by the
      Company of a Business Combination and (y) the liquidation of the Company.


    


    4. The
      undersigned acknowledges and agrees that the Company will not consummate any
      Business Combination that involves a company which is affiliated with any of
      the
      Insiders, the Underwriter or any selling group member. 

    


    5. None
      of
      the undersigned, any member of the family of the undersigned, nor any affiliate
      of the undersigned will be entitled to receive and will not accept any
      compensation for services rendered to the Company prior to the consummation
      of
      the Business Combination; provided that the undersigned shall (i) be entitled
      to
      reimbursement from the Company for his out-of-pocket expenses incurred in
      connection with seeking and consummating a Business Combination, and (ii)
      receive repayment of the promissory note or notes issued by the Company to
      the
      undersigned. 

    


    6. Except
      as
      specifically proved for herein, none of the undersigned, any member of the
      family of the undersigned, or any affiliate of the undersigned will be entitled
      to receive or accept a finder’s fee or any other compensation in the event the
      undersigned, any member of the family of the undersigned or any affiliate of
      the
      undersigned originates a Business Combination. 

    


    7. The
      undersigned will escrow one-hundred percent (100%) of his Insider Shares until
      the earlier of the date that is three years following the Closing Date, the
      date
      the Company has completed a Business Combination, or the date of the Company’s
      liquidation. 

    


    8. The
      undersigned agrees to be the secretary, treasurer and a director of the Company
      until the earlier of the consummation by the Company of a Business Combination
      or the liquidation of the Company. The undersigned’s biographical information
      furnished to the Company and the Underwriter and included in the Registration
      Statement is true and accurate in all respects, does not omit any material
      information with respect to the undersigned’s background and contains all of the
      information required to be disclosed pursuant to Section 401 of Regulation
      S-B,
      promulgated under the Securities Act of 1933, as amended. The undersigned’s
      Questionnaire previously furnished to the Company and the Underwriter is true
      and accurate in all respects. The undersigned represents and warrants that:
      


    (a) he
      is not
      subject to or a respondent in any legal action for, any injunction,
      cease-and-desist order or order or stipulation to desist or refrain from any
      act
      or practice relating to the offering of securities in any jurisdiction;


     

    
      
         

      

      
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    (b) he
      has
      never been convicted of or pleaded guilty to any crime (i) involving any fraud
      or (ii) relating to any financial transaction or handling of funds of another
      person, or (iii) pertaining to any dealings in any securities and he is not
      currently a defendant in any such criminal proceeding; and 

    


    (c) he
      has
      never been suspended or expelled from membership in any securities or
      commodities exchange or association or had a securities or commodities license
      or registration denied, suspended or revoked. 

    


    9. The
      undersigned has full right and power, without violating any agreement by which
      he is bound, to enter into this letter agreement and to serve as secretary,
      treasurer and a director of the Company. 

    


    10. The
      undersigned authorizes any employer, financial institution, or consumer credit
      reporting agency to release to the Underwriter and their legal representatives
      or agents (including any investigative search firm retained by the Underwriter)
      any information they may have about the undersigned’s background and finances
      (“Information”). Neither the Underwriter nor its agents shall be violating the
      undersigned’s right of privacy in any manner in requesting and obtaining the
      Information and the undersigned hereby releases them from liability for any
      damage whatsoever in that connection. 

    


    11. As
      used
      herein, (i) a “Business Combination” shall mean an acquisition, through merger,
      stock exchange, asset acquisition or similar business combination with one
      or
      more operating businesses in the renewable
      energy industry or environmental industries
      that
      has, or collectively have, a fair market value equal to at least 80% of the
      balance in the Trust Account; (ii) “Insiders” shall mean all officers, directors
      and stockholders of the Company immediately prior to the IPO; (iii) “Insider
      Shares” shall mean all of the shares of Common Stock of the Company owned by
      Insiders prior to the IPO; (iv) “IPO Shares” shall mean the shares of Common
      Stock sold as part of the units in the Company’s IPO; and (vi) “Public
      Stockholders” shall mean the public holders of the Company’s common stock issued
      in the IPO. 

     

    
      
         

      

      
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    12. The
      undersigned hereby consents to the jurisdiction and venue of any state or
      federal court located in the State Nevada for purposes of resolving any disputes
      hereunder. The undersigned irrevocably submits to such jurisdiction, which
      jurisdiction shall be exclusive. The undersigned hereby waives any objection
      to
      such exclusive jurisdiction and that such courts represent an inconvenient
      forum. 

     

    
      	Yours very truly,	 	 	 
	 	 	 	 
	
            	 	 	
            
	
              
                

              

              Larry Hopfenspirger

              2025 Nicollet Ave. So., Suite 203

              
                Minneapolis,
                  MN 55404

              

            	 	 	
            


    

     

    
      
         

      

      
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