Certification
Pursuant to Section 302of the Sarbanes-Oxley
Act of 2002

I, John Sheridan, certify
that:

|1. |  | I have reviewed this
      annual report on Form 40-F of Ballard Power Systems Inc.;                                                                                                                                                                                                                                                                      
|-- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|  
|2. |  | Based on my knowledge,
      this report does not contain any untrue statement of a material fact or
      omit to state a material fact necessary to make the statements made, in
      light of the circumstances under which such statements were made, not
      misleading with respect to the period covered by this annual
    report;             
|  
|3. |  | Based on my knowledge,
      the financial statements, and other financial information included in this
      report, fairly present in all material respects the financial condition,
      results of operations and cash flows of the issuer as of, and for, the
      periods presented in this report;                                               
|  
|4. |  | The issuers other
      certifying officer and I are responsible for establishing and maintaining
      disclosure controls and procedures (as defined in Exchange Act Rules
      13a-15(e) and 15d-15(e)) and internal control over financial reporting (as
      defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the issuer and
      have:
|  
|   |  | a)                                                                                                                                                                                                                                                                                                                                                        
|  
|   |  | b)                                                                                                                                                                                                                                                                                                                                                        
|  
|   |  | c)                                                                                                                                                                                                                                                                                                                                                        
|  
|   |  | d)                                                                                                                                                                                                                                                                                                                                                        
|  
|5. |  | The issuers other
      certifying officer and I have disclosed, based on our most recent
      evaluation of internal control over financial reporting, to the issuers
      auditors and the audit committee of the issuers board of directors (or
      persons performing the equivalent functions):                                               
|  
|   |  | a)                                                                                                                                                                                                                                                                                                                                                        
|  
|   |  | b)                                                                                                                                                                                                                                                                                                                                                        
|  

| | Date: March 13, 2008                   
| | ---------------------------------------
| | John Sheridan                        
| | President and Chief Executive
  Officer

A signed original of this written
statement required by Section 302 has been provided to Ballard Power Systems
Inc. and will be retained by Ballard Power Systems Inc. and furnished to the
Securities and Exchange Commission or its staff upon request.

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Certification Pursuant to Section
302of the Sarbanes-Oxley Act of 2002

I,Dave Smith,certify that:

|1. |  | I have reviewed this
      annual report on Form 40-F of Ballard Power Systems Inc.;                                                                                                                                                                                                                                                                      
|-- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|  
|2. |  | Based on my knowledge,
      this report does not contain any untrue statement of a material fact or
      omit to state a material fact necessary to make the statements made, in
      light of the circumstances under which such statements were made, not
      misleading with respect to the period covered by this annual
    report;             
|  
|3. |  | Based on my knowledge,
      the financial statements, and other financial information included in this
      report, fairly present in all material respects the financial condition,
      results of operations and cash flows of the issuer as of, and for, the
      periods presented in this report;                                               
|  
|4. |  | The issuers other
      certifying officer and I are responsible for establishing and maintaining
      disclosure controls and procedures (as defined in Exchange Act Rules
      13a-15(e) and 15d-15(e)) and internal control over financial reporting (as
      defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the issuer and
      have:
|  
|   |  | a.                                                                                                                                                                                                                                                                                                                                                        
|  
|   |  | b.                                                                                                                                                                                                                                                                                                                                                        
|  
|   |  | c.                                                                                                                                                                                                                                                                                                                                                        
|  
|   |  | d.                                                                                                                                                                                                                                                                                                                                                        
|  
|5. |  | The issuers other
      certifying officer and I have disclosed, based on our most recent
      evaluation of internal control over financial reporting, to the issuers
      auditors and the audit committee of the issuers board of directors (or
      persons performing the equivalent functions):                                               
|  
|   |  | a.                                                                                                                                                                                                                                                                                                                                                        
|  
|   |  | b.                                                                                                                                                                                                                                                                                                                                                        

| | Date:
      March 13, 2008   
| | -----------------------------
| | Dave Smith                 
| | Chief
      Financial Officer

A signed original of this written
statement required by Section 302 has been provided to Ballard Power Systems
Inc. and will be retained by Ballard Power Systems Inc. and furnished to the
Securities and Exchange Commission or its staff upon request.

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