United States

Securities and Exchange
Commission

Washington, D.C. 20549

Form 40-F

[   ] REGISTRATION STATEMENT PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 OR 
[X] ANNUAL REPORT PURSUANT TO SECTION 13(A) OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934

For the
      fiscal year ended December 31, 2007
    **Commission File Number 0-25270**


Ballard Power Systems
Inc.(Exact name of Registrant as
specified in its charter)Not
Applicable(Translation of Registrants
name in English (if applicable))

CANADA(Province or other jurisdiction of incorporation or
organization)

3620(Primary Standard Industrial
Classification Code Number (if applicable))

Not applicable(I.R.S. Employer
Identification Number (if applicable))

9000
Glenlyon ParkwayBurnaby, British Columbia V5J 5J8(604) 454-0900(Address and telephone number of
Registrants principal executive offices)

Corporation Trust Company1633
BroadwayNew York, New York 10019(212) 894-8940

(Name, address (including zip code) and
telephone number (including area code)of agent for service in the United
States)

Securities
      registered or to be registered pursuant to Section 12(b) of the
      Act.Title of
      each class
    Name of each exchange on which
      registeredNot
      applicable
    Not
      Applicable


|Securities registered or to be registered
      pursuant to Section 12(g) of the Act.
|-------------------------------------------------------------------------------------
|**Common Shares******                                                                

|Securities for which there is a reporting
      obligation pursuant to Section 15(d) of the Act.
|------------------------------------------------------------------------------------------------
|Not-Applicable                                                                                  

For annual reports, indicate by check mark the information filed
with this Form:

[X]Annual
      information form
    [ ] Audited annual financial statements


Indicate the number of outstanding shares
of each of the issuer's classes of capital or common stock as of the close of
the period covered by the annual report.

82,084,387 Common
Shares

Indicate by check mark whether the
Registrant by filing the information contained in this Form is also thereby
furnishing the information to the Commission pursuant to Rule 12g3-2(b) under
the Securities Exchange Act of 1934 (the "Exchange Act"). If "Yes" is marked,
indicate the filing number assigned to the Registrant in connection with such
Rule.

|Yes[
      ] | 82-________ | No[X]
|------------ | ----------- | -----

---

Indicate by check mark whether the
Registrant (1) has filed all reports required to be filed by Section 13 or 15(d)
of the Exchange Act during the preceding 12 months (or for such shorter period
that the Registrant was required to file such reports) and (2) has been subject
to such filing requirements for the past 90 days.

Yes[X]
    No[
      ]


Disclosure Controls and Procedures

The required disclosure is included in the
Managements Discussion and Analysis that is incorporated herein by reference
to Exhibit 99.2 of the registrants Form 6-K filed February 21, 2008.

Managements Annual Report on
Internal Control Over Financial Reporting

The required disclosure is included in the
Managements Discussion and Analysis that is incorporated herein by reference
to Exhibit 99.2 of the registrants Form 6-K filed February 21, 2008.

The registrant's independent registered
public accounting firm, KPMG LLP, independently assessed the effectiveness of
the registrant's internal control over financial reporting. KMPG LLP's
attestation is located in the Report of Independent Registered Public Accounting
Firm which is incorporated herein by reference to Exhibit 99.1 of the
registrants Form 6-K filed February 21, 2008.

Quorum
Requirements

Pursuant to Rule 4350(a)(1) of the Nasdaq
Stock Market, Inc. Marketplace Rules, the Registrant relies on an exemption from
Rule 4350(f) of the Marketplace Rules, requiring that each Nasdaq-quoted company
have in place a minimum quorum requirement for shareholder meetings of 33 1/3%
of the outstanding shares of the company's voting common stock. The Company's
by-laws currently provide that a quorum is met if holders of at least 5% of the
votes eligible to be cast at a meeting are present or represented by proxy at a
shareholder meeting. At the Company's 2007 Annual General Meeting of
Shareholders, holders of 61.53% of the common shares were present or represented
by proxy at the meeting.

Undertaking

The Registrant undertakes to make
available, in person or by telephone, representatives to respond to inquiries
made by theCommission staff, and to furnish
promptly, when requested to do so by the Commission staff, information relating
to: the securities registered pursuant to Form 40-F; the securities in relation
to which the obligation to file an annual report on Form 40-F arises; or
transactions in said securities.

---

Signatures

Pursuant to the requirements of the
Exchange Act, the Registrant certifies that it meets all of the requirements for
filing on Form 40-F and has duly caused this annual report to be signed on its
behalf by the undersigned, thereto duly authorized.

Registrant: Ballard Power Systems Inc.

|By (Signature and
      Title) |  | /s/ Glenn Kumoi                                             |  | 
|------------------------------ |  | ----------------------------------------------------------- |  | 
|                               |  | Glenn Kumoi                                                
|                               |  | Vice President, Human Resources & Chief Legal
      Officer

Date: March 14, 2008

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EXHIBIT
LIST

|Exhibit |  | Description                                                                                                                                                                                                                                             
|------- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|        |  |                                                                                                                                                                                                                                                         
|99.1    |  | Ballard Power Systems Inc. Consolidated Financial
      Statements for the years ended December 31, 2007, 2006, and 2005
      incorporated by reference to the Form 6-K furnished to the Securities and
      Exchange Commission on February 21, 2008.
|       
|99.2    |  | Ballard Power Systems Inc. Managements Discussion
      and Analysis for the year ended December 31, 2007 incorporated by
      reference to the Form 6-K furnished to the Securities and Exchange
      Commission on February 21, 2008.              
|       
|99.3    |  | Annual Information Form for Ballard Power Systems
      Inc., dated as of March 4, 2008                                                                                                                                                                 
|       
|99.4    |  | Certification pursuant to Section 302 of the
      Sarbanes-Oxley Act of 2002                                                                                                                                                                           
|       
|99.5    |  | Certification pursuant to Section 906 of the
      Sarbanes-Oxley Act of 2002                                                                                                                                                                           
|       
|99.6    |  | Consent of KPMG LLP                                                                                                                                                                                                                                     
|       

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