**Exhibit 99.1**

 

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

 

I, **DennisCampbell,** certify that:

 

1. I have reviewed this annualreport on Form 40-F/A of Ballard Power Systems Inc.;

2. Based on my knowledge, thisreport does not contain any untrue statement of a material fact or omit tostate a material fact necessary to make the statements made, in light of thecircumstances under which such statements were made, not misleading withrespect to the period covered by this annual report;

3. Based on my knowledge, thefinancial statements, and other financial information included in this report,fairly present in all material respects the financial condition, results ofoperations and cash flows of the issuer as of, and for, the periods presentedin this report;

4. The issuer’s othercertifying officer and I are responsible for establishing and maintainingdisclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e)and 15d-15(e)) for the issuer and have:

 

a) designed such disclosure controls and procedures, or caused suchdisclosure controls and procedures to be designed under our supervision, toensure that material information relating to the issuer, including itsconsolidated subsidiaries, is made known to us by others within those entities,particularly during the period in which this report is being prepared;

 

b) evaluated the effectiveness of the issuer’s disclosure controls andprocedures and presented in this report our conclusions about the effectivenessof the disclosure controls and procedures, as of the end of the period coveredby this report based on such evaluation; and

 

c) disclosed in this report any change in the issuer’s internal controlover financial reporting that occurred during the period covered by the annualreport that has materially affected, or is reasonably likely to materiallyaffect the issuer’s internal control over financial reporting.

 

5. The issuer’s othercertifying officer and I have disclosed, based on our most recent evaluation ofinternal control over financial reporting, to the issuer’s auditors and theaudit committee of the issuer’s board of directors (or persons performing theequivalent functions):

 

a) all significant deficiencies and material weaknesses in the designor operation of internal control over financial reporting which are reasonablylikely to adversely affect the issuer’s ability to record, process, summarizeand report financial information; and

 

b) any fraud, whether or not material, that involves management or otheremployees who have a significant role in the issuer’s internal control overfinancial reporting.

 

 
| Date: August 5, 2004                  |
|---------------------------------------|
|                                  |
|                                  |
| /s/ Dennis Campbell                   |   |
| President and Chief Executive Officer |

 

 

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

 

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

 

I, **David Smith,**certify that:

 

1. I have reviewed this annualreport on Form 40-F/A of Ballard Power Systems Inc.;

2. Based on my knowledge, thisreport does not contain any untrue statement of a material fact or omit tostate a material fact necessary to make the statements made, in light of thecircumstances under which such statements were made, not misleading withrespect to the period covered by this annual report;

3. Based on my knowledge, thefinancial statements, and other financial information included in this report,fairly present in all material respects the financial condition, results ofoperations and cash flows of the issuer as of, and for, the periods presentedin this report;

4. The issuer’s othercertifying officer and I are responsible for establishing and maintainingdisclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e)and 15d-15(e)) for the issuer and have:

 

a) designed such disclosure controls and procedures, or caused suchdisclosure controls and procedures to be designed under our supervision, toensure that material information relating to the issuer, including itsconsolidated subsidiaries, is made known to us by others within those entities,particularly during the period in which this report is being prepared;

 

b) evaluated the effectiveness of the issuer’s disclosure controls andprocedures and presented in this report our conclusions about the effectivenessof the disclosure controls and procedures, as of the end of the period coveredby this report based on such evaluation; and

 

c) disclosed in this report any change in the issuer’s internal controlover financial reporting that occurred during the period covered by the annualreport that has materially affected, or is reasonably likely to materiallyaffect the issuer’s internal control over financial reporting.

 

5. The issuer’s othercertifying officer and I have disclosed, based on our most recent evaluation ofinternal control over financial reporting, to the issuer’s auditors and theaudit committee of the issuer’s board of directors (or persons performing theequivalent functions):

 

a) all significant deficiencies and material weaknesses in the designor operation of internal control over financial reporting which are reasonablylikely to adversely affect the issuer’s ability to record, process, summarizeand report financial information; and

 

b) any fraud, whether or not material, that involves management orother employees who have a significant role in the issuer’s internal controlover financial reporting.

 

 
| Date: August 5, 2004    |
|-------------------------|
|                    |
|                    |
| /s/ David Smith         |   |
| Chief Financial Officer |

 

 

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

 

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