**Exhibit 99.4**

** **

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

 

I, **Dennis Campbell,** certify that:

 

1.               I have reviewed this annual report onForm 40-F of Ballard Power Systems Inc.;

 

2.               Based on my knowledge, this report doesnot contain any untrue statement of a material fact or omit to state a materialfact necessary to make the statements made, in light of the circumstances underwhich such statements were made, not misleading with respect to the periodcovered by this annual report;

 

3.               Based on my knowledge, the financialstatements, and other financial information included in this report, fairlypresent in all material respects the financial condition, results of operationsand cash flows of the issuer as of, and for, the periods presented in thisreport;

 

4.               The issuer’s other certifying officerand I are responsible for establishing and maintaining disclosure controls andprocedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) andinternal control over financial reporting (as defined in Exchange Act Rules13a-15(f) and 15d-15(f)) for the issuer and have:

 

a)              Designed suchdisclosure controls and procedures, or caused such disclosure controls andprocedures to be designed under our supervision, to ensure that materialinformation relating to the issuer, including its consolidated subsidiaries, ismade known to us by others within those entities, particularly during theperiod in which this report is being prepared;

 

b)             Designed suchinternal control over financial reporting, or caused such internal control overfinancial reporting to be designed under our supervision, to provide reasonableassurance regarding the reliability of financial reporting and the preparationof financial statements for external purposes in accordance with generallyaccepted accounting principles;

 

c)              Evaluated theeffectiveness of the issuer’s disclosure controls and procedures and presentedin this report our conclusions about the effectiveness of the disclosurecontrols and procedures, as of the end of the period covered by this reportbased on such evaluation; and

 

d)             Disclosed in thisreport any change in the issuer’s internal control over financial reportingthat occurred during the period covered by the annual report that hasmaterially affected, or is reasonably likely to materially affect the issuer’sinternal control over financial reporting; and

 

5.               The issuer’s other certifying officerand I have disclosed, based on our most recent evaluation of internal controlover financial reporting, to the issuer’s auditors and the audit committee ofthe issuer’s board of directors (or persons performing the equivalentfunctions):

 

a)              All significant deficiencies and materialweaknesses in the design or operation of internal control over financial reportingwhich are reasonably likely to adversely affect the issuer’s ability to record,process, summarize and report financial information; and

 

b)             Any fraud, whether or not material, thatinvolves management or other employees who have a significant role in theissuer’s internal control over financial reporting.

 

 

Date: March 18, 2005

 
| /s/  Dennis Campbell                   |   |
|----------------------------------------|--------|
| President  and Chief Executive Officer |

 

 

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

 

----

 

**CertificationPursuant to Section 302 of the Sarbanes-Oxley Act of 2002**

** **

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

 

1.               I have reviewed this annual report onForm 40-F of Ballard Power Systems Inc.;

 

2.               Based on my knowledge, this report doesnot contain any untrue statement of a material fact or omit to state a materialfact necessary to make the statements made, in light of the circumstances underwhich such statements were made, not misleading with respect to the periodcovered by this annual report;

 

3.               Based on my knowledge, the financialstatements, and other financial information included in this report, fairlypresent in all material respects the financial condition, results of operationsand cash flows of the issuer as of, and for, the periods presented in thisreport;

 

4.               The issuer’s other certifying officerand I are responsible for establishing and maintaining disclosure controls andprocedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) andinternal control over financial reporting (as defined in Exchange Act Rules13a-15(f) and 15d-15(f)) for the issuer and have:

 

a.               Designed such disclosure controls andprocedures, or caused such disclosure controls and procedures to be designedunder our supervision, to ensure that material information relating to theissuer, including its consolidated subsidiaries, is made known to us by otherswithin those entities, particularly during the period in which this report isbeing prepared;

 

b.              Designed such internal control overfinancial reporting, or caused such internal control over financial reportingto be designed under our supervision, to provide reasonable assurance regardingthe reliability of financial reporting and the preparation of financialstatements for external purposes in accordance with generally acceptedaccounting principles;

 

c.               Evaluated the effectiveness of theissuer’s disclosure controls and procedures and presented in this report ourconclusions about the effectiveness of the disclosure controls and procedures,as of the end of the period covered by this report based on such evaluation;and

 

d.              Disclosed in this report any change inthe issuer’s internal control over financial reporting that occurred during theperiod covered by the annual report that has materially affected, or isreasonably likely to materially affect the issuer’s internal control overfinancial reporting; and

 

5.               The issuer’s other certifying officerand I have disclosed, based on our most recent evaluation of internal controlover financial reporting, to the issuer’s auditors and the audit committee ofthe issuer’s board of directors (or persons performing the equivalent functions):

 

a.               All significant deficiencies andmaterial weaknesses in the design or operation of internal control overfinancial reporting which are reasonably likely to adversely affect the issuer’sability to record, process, summarize and report financial information; and

 

b.              Any fraud, whether or not material, thatinvolves management or other employees who have a significant role in theissuer’s internal control over financial reporting.

 

Date: March 18, 2005

 
| /s/  David Smith         |   |
|--------------------------|--------|
| Chief  Financial Officer |

 

 

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

 

----