Document:

TAX SHARING AGREEMENT

 Exhibit 10.7 
  
 TAX SHARING AGREEMENT 
  
 This Agreement is made effective this 4th day of September, 2003 (the “Agreement”) between EPC CORPORATION, a Delaware corporation (“EPC”) and ENVIRONMENTAL POWER CORPORATION, a Delaware corporation (“EPC Holdings”). 
  
 RECITALS 
  
 WHEREAS, EPC is primarily engaged in the business of holding the equity interest in Buzzard Power Corporation
(“Buzzard”); 
  
 WHEREAS, EPC is a wholly-owned
subsidiary of EPC Holdings; 
  
 WHEREAS, EPC, EPC Holdings and
Buzzard file consolidated federal income tax returns and would find it advantageous to file consolidated income tax returns with state and other taxing authorities; 
  
 WHEREAS, certain states or other taxing authorities do not permit EPC and EPC Holdings to file consolidated tax returns; and

  
 WHEREAS, EPC contemporaneously herewith is engaging in a
financing transaction under that certain Note Purchase Agreement dated September     , 2003 between Crystal Creek Coalpower Funding LLC (the “Purchaser”) and EPC (the “Note Purchase Agreement”)
that will have direct material benefits to EPC Holdings, and one of the conditions of such transaction is that EPC Holdings undertake an obligation to pay any and all taxes of any nature otherwise due and payable by EPC or Buzzard (whether such
payment obligation arises under a consolidated return or under a separate return filed by EPC or Buzzard). 
  
 NOW, THEREFORE, in consideration of the above recitals and other good and valuable consideration, the parties to this Agreement agree as follows:

  
 1. Definitions. Capitalized terms not otherwise
defined herein shall have the meaning assigned to such terms in the Note Purchase Agreement. 
  
 2. Preparation of Tax Returns. EPC Holdings shall prepare, pursuant to the terms of that certain Management Services Agreement executed contemporaneously herewith, or if such agreement has been terminated,
pursuant to the terms of this Section 1, any and all tax returns required to be filed by EPC and Buzzard with any taxing authority (federal, state, local or otherwise) regardless of whether such tax returns can be prepared on a consolidated basis.
EPC Holdings shall undertake such preparation (as well as the preparation of its own tax returns) in the manner which is necessary and advisable and shall timely file such tax returns (including its own tax returns) as may be required by applicable
law to avoid any penalty or other negative consequence. EPC Holdings shall only be compensated for the provision of such service as part of the Management Services Agreement, or if such agreement is no longer outstanding, the cost of such service
shall be considered a capital contribution from EPC Holdings to EPC. In no 

 
event shall EPC Holdings be entitled to such compensation in contravention with the Note Purchase Agreement. 
  
 3. Payment of Tax Liability. Upon submission of any tax return, EPC
Holdings shall pay to the applicable taxing authority any tax (and any interest or penalties related thereto) due from EPC Holdings, EPC or Buzzard whether such amount arises from (i) an allocable share in a consolidated return, (ii) from a wholly
separate tax return being filed by EPC or Buzzard or (iii) from any tax assessed or imposed by any taxing authority. The payment of such tax liability shall be considered a capital contribution from EPC Holdings to EPC or from EPC to Buzzard, as
applicable, as opposed to a loan. Notwithstanding the foregoing, EPC Holdings in its sole discretion shall have the right to withhold any payment of taxes, interest or penalties to any taxing authority until a final determination of liability has
been rendered by the appropriate taxing authority or a court of competent jurisdiction if EPC Holdings is in good faith contesting the validity or amount of such taxes, interest or penalties claimed to be due from EPC or Buzzard. 
  
 4. Term. The term of this Agreement shall commence on the date hereof
and shall continue through December 31, 2012; provided, however, that EPC Holdings may terminate this Agreement if an Event of Default occurs under the Note Purchase Agreement and the Purchaser exercises any remedies available to it under the Note
Purchase Agreement. Notwithstanding the foregoing, the Purchaser shall have the right to cause EPC and EPC Holdings to terminate this Agreement at any time for cause or if an Event of Default has occurred and is continuing. 
  
 5. Miscellaneous. 
  
 (a) Third Party Rights. The Purchaser and its
successors and assigns shall enjoy the rights and not the obligations of a third-party beneficiary hereunder. No other third party beneficiary rights are created hereunder. 
  
 (b) Survival of Claims. Any claims that EPC or Buzzard may have against EPC Holdings arising from the
performance of EPC Holdings’ obligations hereunder shall survive the termination of this Agreement. Notwithstanding anything to the contrary contained herein, EPC Holdings’ obligation to pay any taxes (and any interest or penalties related
thereto) pursuant to this Agreement which arose or were incurred during the term of this Agreement shall survive termination hereof. 
  
 (c) Headings. Section and article headings used in this Agreement have no legal significance and are used solely for convenience of
reference. 
  
 (d) Governing Law. This
Agreement shall be construed and enforced in accordance with the internal laws of the State of New York, without regard to its principles of conflicts of laws, and each party hereby submits to the non-exclusive jurisdiction of the state courts of
New York and the federal courts of the United States of America sitting in the Southern District of New York. 
  
 [Remainder of page intentionally left blank] 
  

 2 

 IN WITNESS WHEREOF the parties have executed this Agreement the date first above written. and agree to be
bound by the terms hereof and the documents issued pursuant hereto. 
  

	EPC CORPORATION
		
	 By
	 	 /S/ Joseph E. Cresci

	 	 	 Its Joseph E. Cresci, President

	
	ENVIRONMENTAL POWER CORPORATION
		
	 By
	 	 /S/ Donald A. Livingston

	 	 	 Its Donald A. Livingston, Vice President

  
 [Signature Page
to Tax Sharing Agreement]Form of Specimen Certificate for Shares of Common Stock

 Exhibit 4.1 
  

	COMMON STOCK	 	 	 	COMMON STOCK
			
	PAR VALUE $.0001	 	 	 	THIS CERTIFICATE IS TRANSFERRABLE IN NEW YORK, NEW YORK OR CHICAGO, ILLINOIS
			
	Certificate Number	 	 	 	Shares

  
  
 SIGMATEL, INC. 
  
 INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE 
  

	THIS CERTIFIES THAT	 	 	 	CUSIP  82661W  10  7
			
	 	 	 	 	SEE REVERSE FOR CERTAIN DEFINITIONS

  
 is the owner of 
  
 FULLY-PAID AND NON-ASSESSABLE SHARES OF THE COMMON STOCK OF 
  
 SigmaTel, Inc., transferable on the books of the Company in person or by duly
authorized attorney, upon surrender of this Certificate properly endorsed. This Certificate and the shares represented hereby, are issued and shall be held subject to all of the provisions of the Certificate of Incorporation, as amended, and the
By-Laws of the Company (copies of which are on file with the Company and with the Transfer Agent), to all of which each holder, by acceptance hereof, assents. This Certificate is not valid unless countersigned and registered by the Transfer Agent
and Registrar. 
  
 Witness the facsimile seal of the Company and the
facsimile signatures of its duly authorized officers. 
  

	/s/  Ronald P. Edgerton	 	 DATED <<Month Day, Year>>

		
	President	 	COUNTERSIGNED AND REGISTERED
	 	 	COMPUTERSHARE INVESTOR SERVICES, LLC.
	 	 	(CHICAGO)
	 	 	TRANSFER AGENT AND REGISTRAR,
	/s/  Ross A. Goolsby	 	  
 By
	  	                                      
                                        
                       
	Secretary	 	 	  	AUTHORIZED SIGNATURE

  
 The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: 
  

	 TEN COM
	 	   –
	 	as tenants in common	 	UNIF GIFT MIN ACT  –	 	                                  Custodian  
                                
	 	 	 	 	 	 	 	 	(Cust)	 	(Minor)
						
	 TEN ENT
	 	   –
	 	as tenants by the entireties	 	 	 	under Uniform Gifts to Minors Act	 	               
	 	 	 	 	 	 	 	 	 	 	(State)
					
	 JT TEN
	 	   –
	 	as joint tenants with right of	 	UNIF TRF MIN ACT	 	                    Custodian (until
age     )                    
	 	 	 	 	survivorship and not as tenants in 	 	 	 	(Cust)	 	(Minor)
	 	 	 	 	common	 	 	 	 	 	 
						
	 	 	 	 	 	 	 	 	under Uniform Transfers to Minors Act	 	               
	 	 	 	 	 	 	 	 	 	 	(State)
	 	 	 	 	Additional abbreviations may also be used though not in the above list.

  
 SIGMATEL, INC. 
  
 THE COMPANY WILL FURNISH WITHOUT CHARGE TO EACH STOCKHOLDER WHO SO REQUESTS, A SUMMARY OF THE POWERS, DESIGNATIONS, PREFERENCES AND RELATIVE, PARTICIPATING, OPTIONAL OR
OTHER SPECIAL RIGHTS OF EACH CLASS OF STOCK OF THE COMPANY AND THE QUALIFICATIONS, LIMITATIONS OR RESTRICTIONS OF SUCH PREFERENCES AND RIGHTS, AND THE VARIATIONS IN RIGHTS, PREFERENCES AND LIMITATIONS DETERMINED FOR EACH SERIES, WHICH ARE FIXED BY
THE CERTIFICATE OF INCORPORATION OF THE COMPANY, AS AMENDED, AND THE RESOLUTIONS OF THE BOARD OF DIRECTORS OF THE COMPANY, AND THE AUTHORITY OF THE BOARD OF DIRECTORS TO DETERMINE VARIATIONS FOR FUTURE SERIES. SUCH REQUEST MAY BE MADE TO THE OFFICE
OF THE SECRETARY OF THE COMPANY OR TO THE TRANSFER AGENT. THE BOARD OF DIRECTORS MAY REQUIRE THE OWNER OF A LOST OR DESTROYED STOCK CERTIFICATE, OR HIS LEGAL REPRESENTATIVES, TO GIVE THE COMPANY A BOND TO INDEMNIFY IT AND ITS TRANSFER AGENTS AND
REGISTRARS AGAINST ANY CLAIM THAT MAY BE MADE AGAINST THEM ON ACCOUNT OF THE ALLEGED LOSS OR DESTRUCTION OF ANY SUCH CERTIFICATE. 
  
 For value received,
                                        
hereby sell, assign and transfer unto 
  

	 	
	 	 
	 PLEASE INSERT SOCIAL SECURITY
 OR OTHER
IDENTIFYING NUMBER
 OF ASSIGNEE
	 	 	 	 
	 	
	 	 

  

 (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING POSTAL ZIP CODE, OF ASSIGNEE) 
  

  

  
                                       
                                        
                                        
                                        
                                        
      Shares 
 of the capital stock represented by the within Certificate, and do hereby irrevocably constitute and appoint

                                       
                                        
                                        
                                        
                                        
  Attorney 
 to transfer the said stock on the books of the within-named Corporation with full power of substitution in the premises.

  

	 Dated:
	 	                                      
                                	 	20         	  	Signature:	  	  

	
	 	 	 	 
			
	 THE SIGNATURES MUST BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKHOLDERS, SAVINGS AND LOAN ASSOCIATIONS AND
CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM) PURSUANT TO S.E.C. RULE 17Ad-15.
  
	  	 	  	 
	
	 	 	 	 
				
	SIGNATURE(S) GUARANTEED BY:	  	 	  	 	  	 
	 	 	 	 	 	  	 Signature:
  
	  	  

	 	 	 	 	 	  	 	  	Notice:	  	THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE, IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT, OR ANY CHANGE
WHATEVER.

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