| o      | REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) or (g) OF THE SECURITIES EXCHANGE ACT OF 1934                        |
|--------|---------------------------------------------------------------------------------------------------------------------------------|
|   |                                                                                                                            |
| OR     |
|   |                                                                                                                            |
| x      | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934For the fiscal year ended December 31, 2009 |
|   |                                                                                                                            |
| OR     |
|   |                                                                                                                            |
| o      | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934                                        |
|   |                                                                                                                            |
| OR     |
|   |                                                                                                                            |
| o      | SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934                                     |

|   |   |
|--------|--------|

| HYDROGENICS CORPORATION -CORPORATION HYDROGÉNIQUE                                                                                |
|---------------------------------------------------------------------------------------------------------------------------------------|
| (Exact name of Registrant as specified in its charter)                                                                                |
|                                                                                                                                  |
| Canada                                                                                                                                |
| (Jurisdiction of incorporation or organization)                                                                                       |
|                                                                                                                                  |
| 220 Admiral BoulevardMississauga, OntarioCanada L5T 2N6(905) 361-3660                                                                 |
| (Address of principal executive office)                                                                                               |
|                                                                                                                                  |
| Lawrence Davis, Chief Financial Officer220 Admiral BoulevardMississauga, OntarioCanada L5T 2N6 (905) 361-3660 Fax (905) 361-3626 |
| (Name, Telephone, Email and/or Facsimile number and Address of Company Contact Person)                                                |

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|                          | HYDROGENICS CORPORATION |
|-------------------------------|-------------------------|
|                          |                    |   |
|                          |                    |   |
| Dated: November 18, 2010 | By:                     | /s/ Lawrence Davis |
|                          |                    | Name: | Lawrence Davis |
|                          |                    | Title: | Chief Financial Officer |
|                          |                    |   |   |   |

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| Number |   | Description                                                                                                                                                                                                                                                                                |
|--------|--------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 4.13*  |   | Corporate Alliance Agreement between General Motors Corporation and the Company, dated October 16, 2001. (Incorporated by reference from Exhibit 4.27 to Old Hydrogenics’ Annual Report on Form 20-F, filed with the Securities and Exchange Commission on June 26, 2002.)           |
|   |   |                                                                                                                                                                                                                                                                                       |
| 4.14*  |   | Master Intellectual Property Agreement between General Motors Corporation and the Company, dated October 16, 2001. (Incorporated by reference from Exhibit 4.28 to Old Hydrogenics’ Annual Report on Form 20-F, filed with the Securities and Exchange Commission on June 26, 2002.) |
|   |   |                                                                                                                                                                                                                                                                                       |
| 4.15*  |   | Governance Agreement between General Motors Corporation and the Company, dated October 16, 2001. (Incorporated by reference from Exhibit 2 to the Schedule 13D of General Motors Corporation, filed with the Securities and Exchange Commission on October 25, 2001.)                      |
|   |   |                                                                                                                                                                                                                                                                                       |
| 4.16*  |   | Share Subscription Agreement between General Motors Corporation and the Company, dated October 16, 2001. (Incorporated by reference from Exhibit 1 to the Schedule 13D of General Motors Corporation, filed with the Securities and Exchange Commission on October 25, 2001.)              |
|   |   |                                                                                                                                                                                                                                                                                       |
| 4.17*  |   | Escrow Agreement between General Motors Corporation and the Company, dated October 16, 2001. (Incorporated by reference from Exhibit 4  to the Schedule 13D of General Motors Corporation, filed with the Securities and Exchange Commission on October 25, 2001.)               |
|   |   |                                                                                                                                                                                                                                                                                       |
| 4.18*  |   | Registration Rights Agreement between General Motors Corporation and the Company,dated October 16, 2001. (Incorporated by reference from Exhibit 3 to the Schedule 13D of General Motors Corporation , filed with the Securities and Exchange Commission on October 25, 2001.)             |
|   |   |                                                                                                                                                                                                                                                                                       |
| 12.1   |   | Certification of the Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                                                                                                                                                                |
|   |   |                                                                                                                                                                                                                                                                                       |
| 12.2   |   | Certification of the Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                                                                                                                                                                |
|   |   |                                                                                                                                                                                                                                                                                       |