**Exhibit 99.6**

|   | **KPMG LLP**                       | Telephone        (604) 691-3000                                                          |
|--------|------------------------------------|-------------------------------------------------------------------------------------------------------------------|
|   | **Chartered   Accountants**        | Fax                     (604) 691-3031 |
|   | PO Box 10426 777 Dunsmuir   Street | Internet              www.kpmg.ca                          |
|   | Vancouver BC V7Y 1K3               |                                                                                                              |
|   | Canada                             |                                                                                                              |

**CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM**

The Board of Directors Ballard Power Systems Inc.

| We consent   to the inclusion in this annual report on Form 40-F of:                                                                                                                                                                                                                 |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|                                                                                                                                                                                                                                                                                 |   |   |
|                                                                                                                                                                                                                                                                                 | • | our   auditors’ report dated February 19, 2007 on the consolidated balance sheets   of Ballard Power Systems Inc. (the “Company”) as at December 31, 2006, and   the consolidated statements of operations and accumulated deficit, and cash   flows for each of the years in the three-year period ended December 31, 2006. |
|                                                                                                                                                                                                                                                                                 |   |   |
|                                                                                                                                                                                                                                                                                 | • | and our   Comments by Auditors for US Readers on Canada-US Reporting Differences, dated   February 19, 2007; |
|                                                                                                                                                                                                                                                                                 |   |   |
| each of   which is incorporated by reference in this annual report on Form 40-F of the   Company for the fiscal year ended December 31, 2006.                                                                                                                                        |
|                                                                                                                                                                                                                                                                                 |
| We also   consent to the incorporation by reference of such report in the Registration   Statements (Nos. 333-104193, 333-102364, 333-99077, 333-98009, 333-97561,   333-97559, 333-89414, 333-89088, 333-89064, 333-108775, 333-117771) on Form   S-8 of Ballard Power Systems Inc. |

Chartered Accountants Vancouver, Canada February 19, 2007

KPMG LLP, a Canadian limited liability partnership is the Canadian member firm of KPMG International, a Swiss cooperative.