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SECURITIES AND EXCHANGE COMMISSION
 Washington, D.C. 20549
 FORM 40-F
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    REGISTRATION STATEMENT PURSUANT TO SECTION 12(B) OR (G) OF THE
SECURITIES EXCHANGE ACT OF 1934
 OR
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    ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES
EXCHANGE ACT OF 1934
 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2007
 COMMISSION FILE NUMBER 000-31815
 
 HYDROGENICS CORPORATION
 (Exact name of Registrant as specified in its charter)
 Canada  (Province or other jurisdiction of incorporation or organization)
 3629  (Primary Standard Industrial Classification Code Number (if applicable))
 Not applicable  (I.R.S. Employer Identification Number (if applicable))
 5985 McLaughlin Road, Mississauga, Ontario, Canada L5R 1B8, (905) 361-3660  (Address and telephone number of Registrants principal executive offices)
 CT Corporation System, 111 Eighth Avenue, New York, New York 10011, (212) 894-8400  (Name, address (including zip code) and telephone number (including area
code) of agent for service in the United States)
 Common shares
     þ þ
  At December 31, 2007, 91,765,691 common shares were issued and outstanding
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TABLE OF CONTENTS  EVALUATION OF DISCLOSURE CONTROLS AND PROCEDURESEVALUATION OF INTERNAL CONTROLSCHANGES IN INTERNAL CONTROL OVER FINANCIAL REPORTINGIDENTIFICATION OF THE AUDIT COMMITTEEAUDIT COMMITTEE FINANCIAL EXPERTDISCLOSURE PURSUANT TO THE REQUIREMENTS OF NASDAQCODE OF ETHICSPRINCIPAL ACCOUNTANTS FEES AND SERVICESOFF-BALANCE SHEET ARRANGEMENTSTABULAR DISCLOSURE OF CONTRACTUAL OBLIGATIONSUNDERTAKINGCONSENT TO SERVICE OF PROCESSSIGNATURESEXHIBITSex-99.1ex-99.2ex-99.3ex-99.4ex-99.5ex-99.6ex-99.7ex-99.8    Table of Contents  
   
     
   
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Sarbanes-Oxley Act of 2002
 
   2006
    
    
    2007(in thousands)(unaudited)Audit fees
    
    $
    467,301
    
    
    $
    618,398Audit-related fees
    
    
    33,884
    
    
    
    40,992Tax fees
    
    
    11,672
    
    
    
    15,596All other fees
    
    
    57,063
    
    
    
    23,428Total
    
    $
    569,920
    
    
    $
    698,413
 Audit Fees
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Audit-related fees
  Tax fees
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Other fees
   
   
   
   
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HYDROGENICS CORPORATIONBy:
    /s/ Daryl WilsonDaryl WilsonPresident, Chief Executive Officer and Director  - 6 -




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Exhibit
    
    Description99.1
    
    Consolidated Financial Statements for the Year Ended December 31, 2007.99.2
    
    2007 Managements
Discussion and Analysis of Financial Condition and Results of
Operations.99.3
    
    Annual Information Form for the Year Ended December 31, 2007.99.4
    
    Consent of PricewaterhouseCoopers LLP.99.5
    
    Certification of Chief Executive Officer of the Registrant pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.99.6
    
    Certification of Chief Financial Officer of the Registrant pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.99.7
    
    Certification of Chief Executive Officer of the Registrant pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.99.8
    
    Certification of Chief Financial Officer of the Registrant pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.