Form of Non-Statutory Stock Option Agreement



 Exhibit 10.4 
 ENVIRONMENTAL POWER CORPORATION 
 Non-Statutory Stock Option Agreement  
 Granted Under 2006 Equity Incentive Plan 
 1. Grant
of Option. 
 This agreement evidences the grant by Environmental Power Corporation, a Delaware corporation (the “Company”), on
                             (the “Grant Date”) to
[                ], an employee of the Company (the “Participant”), of an option to purchase, in whole or in part, on the terms provided herein
and in the Company’s 2006 Equity Incentive Plan (the “Plan”), a total of [            ] shares (the “Shares”) of common stock, $0.01 par value per
share, of the Company (“Common Stock”) at $[            ] per Share. Unless earlier terminated, this option shall expire at 5:00 p.m., Eastern time, on [insert
date which is ten years minus one day after the Grant Date] (the “Final Exercise Date”). 
 It is intended that the option
evidenced by this agreement is not intended to be incentive stock option as defined in Section 422 of the Internal Revenue Code of 1986, as amended, and any regulations promulgated thereunder (the “Code”). Except as
otherwise indicated by the context, the term “Participant”, as used in this option, shall be deemed to include any person who acquires the right to exercise this option validly under its terms. 
 2. Vesting Schedule. 
 (a) This option will become
exercisable (“vest”) as to the percentage of the original number of Shares as set forth below: 
  

			
	 Date
	  	Percentage Vested

  
 (b) The right of exercise
shall be cumulative so that to the extent the option is not exercised in any period to the maximum extent permissible it shall continue to be exercisable, in whole or in part, with respect to all Shares for which it is vested until the earlier of
the Final Exercise Date or the termination of this option under Section 3 hereof or the Plan. 
 3. Exercise of Option. 
 (a) Form of Exercise. Each election to exercise this option shall be in writing, signed by the Participant, and received by the Company at its
principal office, accompanied by this agreement, and payment in full in the manner provided in the Plan. The Participant may purchase less than the number of shares covered hereby, provided that no partial exercise of this option may be for any
fractional share or for fewer than ten whole shares. 







 (b) Continuous Relationship with the Company Required. Except as otherwise provided in this
Section 3, this option may not be exercised unless the Participant, at the time he or she exercises this option, is, and has been at all times since the Grant Date, an employee or officer of, or consultant or advisor to, the Company or any
parent or subsidiary of the Company as defined in Section 424(e) or (f) of the Code (an “Eligible Participant”). 
 (c)
Termination of Relationship with the Company. If the Participant ceases to be an Eligible Participant for any reason, then, except as provided in paragraphs (d) and (e) below, the right to exercise this option shall terminate three
months after such cessation (but in no event after the Final Exercise Date), provided that this option shall be exercisable only to the extent that the Participant was entitled to exercise this option on the date of such cessation.
Notwithstanding the foregoing, if the Participant, prior to the Final Exercise Date, violates the non-competition or confidentiality provisions of any employment contract, confidentiality and nondisclosure agreement or other agreement between the
Participant and the Company, the right to exercise this option shall terminate immediately upon such violation. 
 (d) Exercise Period
Upon Death or Disability. If the Participant dies or becomes disabled (within the meaning of Section 22(e)(3) of the Code) prior to the Final Exercise Date while he or she is an Eligible Participant and the Company has not terminated such
relationship for “cause” as specified in paragraph (e) below, this option shall be exercisable, within the period of one year following the date of death or disability of the Participant, by the Participant (or in the case of death by
an authorized transferee), provided that this option shall be exercisable only to the extent that this option was exercisable by the Participant on the date of his or her death or disability, and further provided that this option shall
not be exercisable after the Final Exercise Date. 
 (e) Discharge for Cause. If the Participant, prior to the Final Exercise Date, is
discharged by the Company for “cause” (as defined below), the right to exercise this option shall terminate immediately upon the effective date of such discharge. “Cause” shall mean willful misconduct by the Participant or
willful failure by the Participant to perform his or her responsibilities to the Company (including, without limitation, breach by the Participant of any provision of any employment, consulting, advisory, nondisclosure, non-competition or other
similar agreement between the Participant and the Company), as determined by the Company, which determination shall be conclusive. The Participant shall be considered to have been discharged for “Cause” if the Company determines, within 30
days after the Participant’s resignation, that discharge for cause was warranted. 
 4. Tax Matters. 
 (a) Withholding. No Shares will be issued pursuant to the exercise of this option unless and until the Participant pays to the Company, or makes
provision satisfactory to the Company for payment of, any federal, state or local withholding taxes required by law to be withheld in respect of this option. 
 (b) Disqualifying Disposition. If the Participant disposes of Shares acquired upon exercise of this option within two years from the Grant Date or one year after such Shares were acquired pursuant to exercise
of this option, the Participant shall notify the Company in writing of such disposition. 







 5. Nontransferability of Option. 
 This option may not be sold, assigned, transferred, pledged or otherwise encumbered by the Participant, either voluntarily or by operation of law, except by will or the laws of descent and distribution, and, during
the lifetime of the Participant, this option shall be exercisable only by the Participant. 
 6. Provisions of the Plan. 
 This option is subject to the provisions of the Plan, a copy of which is furnished to the Participant with this option. 
 IN WITNESS WHEREOF, the Company has caused this option to be executed under its corporate seal by its duly authorized officer. This option shall take
effect as a sealed instrument. 
  

					
		 	ENVIRONMENTAL POWER CORPORATION
			
	Dated:	 	By:	 	  

		 	Name:	 	  

		 	Title:	 	  


 PARTICIPANT’S ACCEPTANCE 
 The undersigned hereby accepts the foregoing option and agrees to the terms and conditions thereof. The undersigned hereby acknowledges receipt of a copy
of the Company’s 2006 Equity Incentive Plan. 
  

			
	PARTICIPANT:
	
	  

		
	Address:	 	  

		
		 	  










 EXHIBIT A 
 NOTICE OF STOCK OPTION EXERCISE 
 Date:
                                 
  

	Environmental	Power Corporation 


	One	Cate Street, 4th Floor 



	Portsmouth,	NH 03801 

  

	Attention:	Treasurer 

  

	Dear	Sir or Madam: 

 I am the holder of a Non-Statutory Stock Option granted to
me under the Environmental Power Corporation (the “Company”) 2006 Equity Incentive Plan on                  for the purchase of
             shares of Common Stock of the Company at a purchase price of $             per share. 
 I hereby exercise my option to purchase              shares of Common Stock (the “Shares”),
for which I have enclosed                  in the amount of             . Please register my
stock certificate as follows: 
  

					
		 	Name(s):	 	  

		 		 	  

			
		 	Address:	 	  

			
		 	Tax I.D. #:	 	  


  

	
	Very truly yours,
	
	  
  
 (Signature)