[FORM OF UNDERWRITING AGREEMENT]

Exhibit 2.1

4,500,000 Shares

Westport Innovations Inc.

Common Shares, No Par Value

UNDERWRITING AGREEMENT

August [ ], 2008

JEFFERIES & COMPANY, INC.
As Representative of the several Underwriters
520 Madison Avenue

New York, New York 10022

Ladies and Gentlemen:

Introductory. Westport Innovations Inc., an Alberta corporation (the “Company”), proposes to issue and sell to the several underwriters named in Schedule A (the “Underwriters”) an aggregate of 4,500,000 of its common shares, no par value per share (the “Shares”). The 4,500,000 Shares to be sold by the Company are called the “Firm Shares.” In addition, the Company has granted to the Underwriters an option to purchase up to an additional 675,000 Shares as provided in Section 2. The additional 675,000 Shares to be sold by the Company pursuant to such option are collectively called the “Optional Shares.” The Firm Shares and, if and to the extent such option is exercised, the Optional Shares are collectively called the “Offered Shares.” Jefferies & Company, Inc. (“Jefferies”) has agreed to act as representative of the several Underwriters (in such capacity, the “Representative”) in connection with the offering and sale of the Offered Shares.

The Company has prepared and filed with the securities regulatory authorities (the “Canadian Commissions”) in the provinces of Canada other than Quebec (the “Qualifying Jurisdictions”) a preliminary short form base PREP prospectus dated July 21, 2008, in respect of the offering of the Offered Shares in accordance with Multilateral Instrument 11-102 Passport Systems and National Policy 11-202 Process for Prospectus Reviews in Multiple Jurisdictions (such preliminary short form base PREP prospectus relating to the distribution of the Offered Shares used in Canada, including any documents incorporated by reference therein and any supplements or amendments thereto, is herein called the “Canadian Preliminary Prospectus”); the British Columbia Securities Commission has issued a receipt for the Canadian Preliminary Prospectus, which receipt evidences that a receipt has been issued by the Ontario Securities Commission, and the Company has satisfied the conditions in Multilateral Instrument 11-102 to the deemed issuance of a receipt by the Canadian Commissions for the Canadian Preliminary Prospectus in each of the other Qualifying Jurisdictions; the Company has also prepared and filed with the United States Securities and Exchange Commission (the “Commission”) a registration statement on Form F-10 (File No. 333-152441) for the registration of the offering of the Offered Shares under the U.S. Securities Act of 1933, as amended, and the rules and regulations promulgated thereunder (the “Securities Act”), including the Canadian Preliminary Prospectus (with such deletions therefrom and additions thereto as are permitted or required by Form F-10 and the applicable rules and regulations of the Commission). The effective date of such registration statement or, if the Company files any post-effective amendment to such registration statement, the effective date of the latest such amendment is hereinafter called the “Effective

Date.” The Company has elected to rely upon the provisions of National Instrument 44-103 Post-Receipt Pricing of the Canadian Securities Administrators for the pricing of securities after the final receipt for a prospectus has been obtained (the “PREP Procedures”).

In addition, the Company (i) has prepared and filed (x) with the Canadian Commissions in the Qualifying Jurisdictions, a final short form base PREP prospectus dated August [ ], 2008 relating to the Offered Shares (together with all amendments thereto, the “Final PREP Prospectus”) omitting the PREP Information (as hereinafter defined) and (y) with the Commission, an amendment to such registration statement, including the Final PREP Prospectus (with such deletions therefrom and additions thereto as are permitted or required by Form F-10 and the applicable rules and regulations of the Commission) omitting the PREP Information (such prospectus, the “U.S. Final PREP Prospectus”), which most recent such amendment has become or been declared effective by the Commission, and (ii) will prepare and file, as soon as possible and in any event within two business days after the date of execution and delivery of this Agreement, (x) with the Canadian Commissions in the Qualifying Jurisdictions, in accordance with the PREP Procedures, a supplemented short form PREP prospectus setting forth the PREP Information (the “PREP Prospectus Supplement”) and (y) with the Commission, in accordance with General Instruction II.L of Form F-10, the PREP Prospectus Supplement with such deletions therefrom and additions thereto as are permitted or required by Form F-10 and the applicable rules and regulations of the Commission (the “U.S. Prospectus Supplement”); the information, if any, included in the PREP Prospectus Supplement that is omitted from the Final PREP Prospectus, but that is deemed under the PREP Procedures to be incorporated by reference into the Final PREP Prospectus as of the date of the PREP Prospectus Supplement, is referred to herein as the “PREP Information.”

The registration statement on Form F-10, including any amendment thereof prior to the Effective Date and including the exhibits thereto, the documents incorporated or deemed to be incorporated by reference therein and any information deemed to be a part thereof at the Effective Date for purposes of Section 11 under the Securities Act and including the PREP Information, is herein called the “Registration Statement.” The preliminary prospectus contained in the Registration Statement declared effective by the Commission relating to the distribution of the Offered Shares in the United States, including the documents incorporated by reference therein, is herein called the “U.S. Preliminary Prospectus.” The U.S. Preliminary Prospectus and the Canadian Preliminary Prospectus are herein collectively referred to as the “Preliminary Prospectus.” The U.S. Preliminary Prospectus, including the documents incorporated by reference therein, is herein called the “Prospectus,” provided that from and after the time that a U.S. Prospectus Supplement containing the PREP Information is filed with the Commission, the term “Prospectus” shall refer to such U.S. Prospectus Supplement, including the documents incorporated by reference therein; the Final PREP Prospectus, including the documents incorporated by reference therein, is herein referred to as the “Canadian Prospectus,” provided that from and after the time that a PREP Prospectus Supplement containing the PREP Information is filed with the Canadian Commissions in the Qualifying Jurisdictions, the term “Canadian Prospectus” shall refer to such PREP Prospectus Supplement, including the documents incorporated by reference therein; any amendment or supplement to the Prospectus or the Canadian Prospectus (including any document incorporated by reference therein) that may be filed by or on behalf of the Company with the Canadian Commissions in the Qualifying Jurisdictions or with Commission after the PREP Prospectus Supplement and the U.S. PREP Prospectus Supplement have been filed and prior to completion of distribution of the Offered Shares is referred to herein collectively as the “Supplementary Material.” The Company represents and warrants that no other document with respect to the Final PREP Prospectus (other than documents collateral thereto) or the Registration Statement or documents incorporated by

reference therein has previously been filed with the Canadian Commissions in the Qualifying Jurisdictions or the Commission, respectively, except for letters transmitting documents for filing and other non-material correspondence.

As used herein, “Applicable Time” is [ : ] m (New York time) on August [ ], 2008. As used herein, “free writing prospectus” has the meaning set forth in Rule 405 under the Securities Act, and “Time of Sale Prospectus” means the Preliminary Prospectus together with the information and the free writing prospectuses, if any, identified in Schedule B hereto, and each “road show” (as defined in Rule 433 under the Securities Act), if any, related to the offering of the Offered Shares contemplated hereby that is a “written communication” (as defined in Rule 405 under the Securities Act) (each such road show, a “Road Show”). As used herein, the terms “Registration Statement,” “Preliminary Prospectus,” “Time of Sale Prospectus,” “Canadian Prospectus” and “Prospectus” shall include the documents incorporated and deemed to be incorporated by reference therein. All references in this Agreement to the Registration Statement, the U.S. Preliminary Prospectus or the Prospectus, or any amendments or supplements to any of the foregoing, shall include any copy thereof filed with the Commission pursuant to its Electronic Data Gathering, Analysis and Retrieval System (“EDGAR”). All references in this Agreement to financial statements and schedules and other information which are “contained,” “included” or “stated” in the Registration Statement, the Preliminary Prospectus, the Time of Sale Prospectus, the Canadian Prospectus or the Prospectus (and all other references of like import) shall be deemed to mean and include all such financial statements and schedules and other information which is or is deemed to be incorporated by reference in the Registration Statement, the Preliminary Prospectus, the Time of Sale Prospectus, the Canadian Prospectus or the Prospectus, as the case may be; and all references in this Agreement to amendments or supplements to the Registration Statement, the Preliminary Prospectus, the Time of Sale Prospectus, the Canadian Prospectus or the Prospectus, as the case may be, shall be deemed to mean and include the filing of any document under the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise that is or is deemed to be incorporated by reference in the Registration Statement, the Preliminary Prospectus, the Time of Sale Prospectus, the Canadian Prospectus or the Prospectus, as the case may be.

The Company hereby confirms its agreements with the Underwriters as follows:

Section 1. Representations and Warranties.

The Company hereby represents and warrants to each Underwriter, as of the date of this Agreement, as of the First Closing Date (as hereinafter defined) and as of each Option Closing Date (as hereafter defined), if any, and covenants with each Underwriter, as follows:

(a) Forms F-10 and F-X. The Company is a “foreign private issuer” (as defined in Rule 405 under the Securities Act) and is entitled to use Form F-10 under the Securities Act to register the offering of the Offered Shares under the Securities Act. The Company has prepared and filed with the Commission an appointment of agent for service of process upon the Company on Form F-X in conjunction with the filing of the Registration Statement (the “Form F-X”). The Registration Statement and the Form F-X conform, and any further amendments to the Registration Statement or the Form F-X will conform, in all material respects to the requirements of the Securities Act.

(b) Compliance with Canadian Regulations. The Company is eligible to use the PREP Procedures. No order preventing or suspending the use of the Canadian Preliminary Prospectus or the Canadian Prospectus or preventing the distribution of the Offered Shares

has been issued and no proceeding for that purpose has been initiated or, to the knowledge of the Company, threatened, by any of the Canadian Commissions; as of their respective dates, the Canadian Preliminary Prospectus and the Canadian Prospectus complied in all material respects with all applicable securities laws in the Qualifying Jurisdictions and the respective rules, regulations, blanket rulings, orders and notices made thereunder and the local, uniform, national and multilateral instruments and policies adopted by the Canadian Commissions in the Qualifying Jurisdictions (collectively, the “Canadian Securities Laws”); each of the Canadian Commissions in the Qualifying Jurisdictions has issued or is deemed to have issued receipts for the Canadian Preliminary Prospectus and the Canadian Prospectus. On the First Closing Date and each Option Closing Date (as those terms are defined in Section 2), if any, (i) the Canadian Prospectus will comply in all material respects with the Canadian Securities Laws; (ii) the Prospectus will conform with the Canadian Prospectus except for such deletions therefrom and additions thereto as are permitted or required by Form F-10 and the applicable rules and regulations of the Commission; and (iii) the Canadian Prospectus and the Prospectus or any amendment or supplement thereto constituted at the respective dates thereof, and will constitute at the First Closing Date and each Option Closing Date, full, true and plain disclosure of all material facts relating to the Offered Shares, and did not at the respective dates thereof, and will not at the First Closing Date or any Option Closing Date, contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading; provided, however, that the representations and warranties contained in clause (iii) of this sentence shall not apply to the omission of the PREP Information in accordance with the PREP Procedures or any statements or omissions made in reliance upon and in conformity with information provided in writing to the Company by the Underwriters expressly for use therein, it being understood and agreed that the only such information furnished by the Representative to the Company consists of the information described in Section 8(b) below. To its knowledge, the Company is not a “related issuer” or “connected issuer” (as those terms are defined in National Instrument 33-105 Underwriting Conflicts of the Canadian Securities Administrators) of any of the Underwriters.

(c) Compliance With Registration Requirements. The Registration Statement has been declared effective by the Commission under the Securities Act. The Company has complied to the Commission’s satisfaction with all requests of the Commission for additional or supplemental information. No stop order suspending the effectiveness of the Registration Statement is in effect and no proceedings for such purpose have been instituted or are pending or, to the knowledge of the Company, are contemplated or threatened by the Commission.

The U.S. Preliminary Prospectus and the Prospectus when filed complied in all material respects with the Securities Act and were identical to the copies thereof delivered to the Underwriters for use in connection with the offer and sale of the Offered Shares. Each of the Registration Statement and any post-effective amendment thereto, at the time it became effective and at the First Closing Date and each Option Closing date, complied and will comply in all material respects with the Securities Act and did not and will not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading. As of the Applicable Time, the Time of Sale Prospectus did not, and at the time of each sale of the Offered Shares and at the First Closing Date (as defined in Section 2), the Time of Sale Prospectus, as then amended or supplemented by the Company, if applicable, will not, contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the

light of the circumstances under which they were made, not misleading. The Prospectus, as amended or supplemented, as of its date and at the First Closing Date and each Option Closing Date, did not and will not contain any untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading. The representations and warranties set forth in the three immediately preceding sentences do not apply to the omission of the PREP Information in accordance with the PREP Procedures or statements in or omissions from the Registration Statement or any post-effective amendment thereto, or the Prospectus or the Time of Sale Prospectus, or any amendments or supplements thereto, made in reliance upon and in conformity with information relating to any Underwriter furnished to the Company in writing by the Representative expressly for use therein, it being understood and agreed that the only such information furnished by the Representative to the Company consists of the information described in Section 8(b) below. There are no contracts or other documents required to be described in the Time of Sale Prospectus or the Prospectus or to be filed as exhibits to the Registration Statement which have not been described or filed as required.

The Company is not an “ineligible issuer” in connection with the offering of the Offered Shares pursuant to Rules 164, 405 and 433 under the Securities Act. Any free writing prospectus that the Company is required to file pursuant to Rule 433(d) under the Securities Act has been, or will be, filed with the Commission in accordance with the requirements of the Securities Act. Each free writing prospectus that the Company has filed, or is required to file, pursuant to Rule 433(d) under the Securities Act or that was prepared by or on behalf of or used or referred to by the Company complies or will comply in all material respects with the requirements of Rule 433 under the Securities Act including timely filing with the Commission or retention where required and legending, and each such free writing prospectus, as of its issue date and at all subsequent times through the completion of the public offer and sale of the Offered Shares did not, does not and will not include any information that conflicted, conflicts or will conflict with the information contained in the Registration Statement, the Prospectus or the Preliminary Prospectus. Except for the free writing prospectuses, if any, identified in Schedule B hereto, and electronic road shows, if any, furnished to you before first use, the Company has not prepared, used or referred to, and will not, without your prior consent, prepare, use or refer to, any free writing prospectus.

The documents incorporated or deemed to be incorporated by reference in the Prospectus, when they were filed with the Canadian Commissions, conformed in all material respects to the requirements of the Canadian Securities Laws; and any further documents to be incorporated by reference in the Prospectus subsequent to the effectiveness of the Registration Statement and prior to the completion of the distribution of the Offered Shares, when such documents are so filed, will conform in all material respects to the applicable requirements of the Canadian Securities Laws, and will not contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading.

(d) Reports and Documents, etc. There are no reports or information that in accordance with the requirements of the Canadian Securities Laws must be made publicly available in connection with the offering of the Offered Shares that have not been made publicly available as required. There are no documents required to be filed with the Canadian Commissions in the Qualifying Jurisdictions in connection with the Canadian Preliminary Prospectus or the Canadian Prospectus that have not been filed as required pursuant to Canadian Securities

Laws (other than those required to be filed after the date hereof pursuant to the PREP Procedures). There are no contracts or other documents required to be described in the Canadian Prospectus which have not been described or filed as required pursuant to Canadian securities Laws.

(e) Offering Materials Furnished to Underwriters. The Company has delivered to the Representative one complete manually signed copy of the Registration Statement, each amendment thereto and each consent and certificate of experts filed as a part thereof, and conformed copies of the Registration Statement and each amendment thereto (without exhibits), the Preliminary Prospectus, the Time of Sale Prospectus, the Canadian Prospectus and the Prospectus, as amended or supplemented, and any free writing prospectus reviewed and consented to by the Representative, in such quantities and at such places as the Representative has reasonably requested for each of the Underwriters.

(f) Distribution of Offering Material By the Company. The Company has not distributed and will not distribute, prior to the later of (i) the expiration or termination of the option granted to the several Underwriters in Section 2 and (ii) the completion of the Underwriters’ distribution of the Offered Shares, any offering material in connection with the offering and sale of the Offered Shares other than the Preliminary Prospectus, the Time of Sale Prospectus, the Canadian Prospectus, the Prospectus, any free writing prospectus reviewed and consented to by the Representative, or the Registration Statement.

(g) The Underwriting Agreement. This Agreement has been duly authorized, executed and delivered by, and is a valid and binding agreement of, the Company, enforceable in accordance with its terms, except as rights to indemnification hereunder may be limited by applicable law and except as the enforcement hereof may be limited by bankruptcy, insolvency, reorganization, moratorium or other similar laws relating to or affecting the rights and remedies of creditors or by general equitable principles.

(h) Authorization of the Offered Shares. The Offered Shares have been duly authorized for issuance and sale pursuant to this Agreement and, when issued and delivered by the Company pursuant to this Agreement, will be validly issued, fully paid and nonassessable, and the issuance and sale of the Offered Shares is not subject to any preemptive rights, rights of first refusal or other similar rights to subscribe for or purchase the Offered Shares created by law or the Company.

(i) No Applicable Registration or Other Similar Rights. There are no persons with registration or other similar rights to have any equity or debt securities registered or qualified for sale under the Registration Statement or the Canadian Prospectus or included in the offering contemplated by this Agreement.

(j) No Material Adverse Change. Except as otherwise disclosed in the Time of Sale Prospectus, subsequent to the respective dates as of which information is given in the Time of Sale Prospectus: (i) there has been no material adverse change, or any development that could reasonably be expected to result in a material adverse change, in the condition, financial or otherwise, or in the earnings, business, operations or prospects, whether or not arising from transactions in the ordinary course of business, of the Company and its Subsidiaries (as defined below), considered as one entity (any such change is called a “Material Adverse Change”); (ii) the Company and its Subsidiaries, considered as one entity, have not incurred any material liability or obligation, indirect, direct or contingent, not in the ordinary course of business nor entered into any material transaction or agreement not

in the ordinary course of business; and (iii) there has been no dividend or distribution of any kind declared, paid or made by the Company or, except for dividends paid to the Company or other Subsidiaries, any of its Subsidiaries on any class of share capital or repurchase or redemption by the Company or any of its Subsidiaries of any class of share capital.

(k) Independent Accountants. KPMG LLP, who have delivered their report with respect to the financial statements (which term as used in this Agreement includes the related notes thereto) and supporting schedules filed with the Commission as a part of the Registration Statement and included in the Preliminary Prospectus, the Time of Sale Prospectus, the Canadian Prospectus and the Prospectus (each, an “Applicable Prospectus” and collectively, the “Applicable Prospectuses”), are (i) independent public, certified public or chartered accountants as required by the Securities Act, the Exchange Act and applicable Canadian Securities Laws, (ii) in compliance with the applicable requirements relating to the qualification of accountants under Rule 2-01 of Regulation S-X and (iii) a registered public accounting firm as defined by the Public Company Accounting Oversight Board (the “PCAOB”) whose registration has not been suspended or revoked and who has not requested such registration to be withdrawn. There has not been any “reportable event” (as that term is defined in National Instrument 51-102 Continuous Disclosure Obligations of the Canadian Securities Administrators) with KPMG LLP or any other prior auditor of the Company or any of its Subsidiaries.

(l) Preparation of the Financial Statements. The financial statements filed with the Commission as a part of the Registration Statement or included or incorporated by reference in the Preliminary Prospectus, the Canadian Prospectus, the Time of Sale Prospectus, the Prospectus and the Canadian Prospectus present fairly, in all material respects, the consolidated financial position of the Company and its Subsidiaries as of and at the dates indicated and the results of their operations and cash flows for the periods specified. The supporting schedules included in the Registration Statement present fairly, in all material respects, the information required to be stated therein. Such financial statements and supporting schedules have been prepared in conformity with generally accepted accounting principles as applied in Canada applied on a consistent basis throughout the periods involved, except as may be expressly stated in the related notes thereto. The consolidated financial statements, including the notes thereto, included in the Registration Statement, the Time of Sale Prospectus and the Prospectus have been reconciled to generally accepted accounting principles in the United States in accordance with Item 18 of Form 20-F under the Exchange Act. No other financial statements or supporting schedules are required by the Securities Act or Canadian Securities Laws to be included in the Registration Statement, the Prospectus or the Canadian Prospectus. The financial data set forth in the Prospectus under the captions “Prospectus Summary—Summary Selected Financial Data,” “Selected Financial Data” and “Capitalization” fairly present, in all material respects, the information set forth therein on a basis consistent with that of the audited financial statements contained in the Registration Statement, the Prospectus and the Canadian Prospectus. To the knowledge of the Company, no person who has been suspended or barred from being associated with a registered public accounting firm, or who has failed to comply with any sanction pursuant to Rule 5300 promulgated by the PCAOB, has participated in or otherwise aided the preparation of, or audited, the financial statements, supporting schedules or other financial data filed with the Commission as a part of the Registration Statement and included in any Applicable Prospectus.

(m) Company’s Accounting System. Each of the Company and its Subsidiaries makes and keeps accurate books and records and maintains a system of internal accounting controls

sufficient to provide reasonable assurance that (i) transactions are executed in accordance with management’s general or specific authorization; (ii) transactions are recorded as necessary to permit preparation of financial statements in conformity with generally accepted accounting principles as applied in Canada and to maintain accountability for assets; (iii) access to assets is permitted only in accordance with management’s general or specific authorization; and (iv) the recorded accountability for assets is compared with existing assets at reasonable intervals and appropriate action is taken with respect to any differences. No material weakness has been identified in the Company’s internal control over financial reporting (whether or not remediated) and, except as set forth in each Applicable Prospectus, since March 31, 2008, there has been no change in the Company’s internal control over financial reporting that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting.

(n) Incorporation and Good Standing of the Company and its Subsidiaries. Each of the Company and its subsidiaries listed on Schedule C-1 (collectively, the “Subsidiaries”), has been duly incorporated or organized, as the case may be, and is validly existing as a corporation, partnership or limited liability company, as applicable, in good standing under the laws of the jurisdiction of its incorporation or organization and has the power and authority (corporate or other) to own, lease and operate its properties and to conduct its business as described in each Applicable Prospectus and, in the case of the Company, to enter into and perform its obligations under this Agreement. Each of the Company and its Subsidiaries is duly qualified as a corporation, foreign corporation, extra-provincial corporation, partnership or limited liability company, as applicable, to transact business and is in good standing in each jurisdiction in which such qualification is required, whether by reason of the ownership or leasing of property or the conduct of business, except where the failure to be so qualified and in good standing would not, individually or in the aggregate, result in a Material Adverse Change. All of the issued and outstanding capital shares or other equity or ownership interests of each Subsidiary have been duly authorized and validly issued, are fully paid and nonassessable and, except as set forth in each Applicable Prospectus, are owned by the Company, directly or through Subsidiaries, free and clear of any security interest, mortgage, pledge, lien, encumbrance or adverse claim. The Company does not own or control, directly or indirectly, any corporation, association or other entity other than as disclosed on Schedule C-1 and C-2.

(o) Capitalization and Other Share Capital Matters. The authorized, issued and outstanding share capital of the Company is as set forth in each Applicable Prospectus under the caption “Consolidated Capitalization” (other than for subsequent issuances, if any, pursuant to employee benefit plans described in each Applicable Prospectus or upon the exercise of outstanding options or warrants described in each Applicable Prospectus). The Shares (including the Offered Shares) conform in all material respects to the description thereof contained in each Applicable Prospectus. All of the issued and outstanding Shares have been duly authorized and validly issued, are fully paid and nonassessable and have been issued in compliance with all applicable U.S. and Canadian securities laws. None of the outstanding Shares was issued in violation of any preemptive rights, rights of first refusal or other similar rights to subscribe for or purchase securities of the Company created by law or the Company. There are no authorized or outstanding options, warrants, preemptive rights, rights of first refusal or other rights to purchase, or equity or debt securities convertible into or exchangeable or exercisable for, any shares of the Company or any of its Subsidiaries other than those accurately described in each Applicable Prospectus. The description of the Company’s stock option, stock bonus and other stock plans or arrangements, and the options or other rights granted thereunder, set forth in each Applicable Prospectus accurately and

fairly presents, in all material respects, the information required to be shown with respect to such plans, arrangements, options and rights.

(p) Stock Exchange Listings. The Offered Shares have been approved for listing on the Nasdaq Global Market, subject only to official notice of issuance. The Offered Shares have been conditionally approved for listing and for trading on the Toronto Stock Exchange (“TSX”) including on a “when issued” trading basis immediately following the filing of the Canadian Prospectus up until completion of the offering of the Offered Shares, subject to satisfaction by the Company of the conditions imposed by the TSX; subject to the foregoing, all acts have been taken and all documents have been filed under the Canadian Securities Laws and TSX and Nasdaq rules (except post-closing matters) to enable the Offered Shares to trade on the TSX and the Nasdaq Global Market;

(q) Non-Contravention of Existing Instruments; No Further Authorizations or Approvals Required. Neither the Company nor any of its Subsidiaries is in violation of its charter or by-laws, partnership agreement or operating agreement or similar organizational document, as applicable, or is in default (or, with the giving of notice or lapse of time, would be in default) (“Default”) under any indenture, mortgage, loan or credit agreement, note, contract, franchise, lease or other instrument to which the Company or any of its Subsidiaries is a party or by which it or any of them may be bound (including, without limitation, any credit agreement, indenture, pledge agreement, security agreement or other instrument or agreement evidencing, guaranteeing, securing or relating to indebtedness of the Company or any of its Subsidiaries), or to which any of the property or assets of the Company or any of its Subsidiaries is subject (each, an “Existing Instrument”), except for such Defaults as would not, individually or in the aggregate, result in a Material Adverse Change. The Company’s execution, delivery and performance of this Agreement, consummation of the transactions contemplated hereby and by each Applicable Prospectus and the issuance and sale of the Offered Shares (i) have been duly authorized by all necessary corporate action and will not result in any violation of the provisions of the charter or by-laws, partnership agreement or operating agreement or similar organizational document of the Company or any Subsidiary, as applicable, (ii) will not conflict with or constitute a breach of, or Default or a Debt Repayment Triggering Event (as defined below) under, or result in the creation or imposition of any lien, charge or encumbrance upon any property or assets of the Company or any of its Subsidiaries pursuant to, or require the consent of any other party to, any Existing Instrument and (iii) will not result in any violation of any law, administrative regulation or administrative or court decree applicable to the Company or any Subsidiary. No consent, approval, authorization or other order of, or registration or filing with, any court or other governmental or regulatory authority or agency, is required for the Company’s execution, delivery and performance of this Agreement and consummation of the transactions contemplated hereby and by each Applicable Prospectus, except such as have been obtained or made or, as contemplated by this Agreement, will be obtained or made, by the Company and are in full force and effect under the Securities Act, applicable Canadian Securities Laws, applicable state securities or blue sky laws and from the Financial Industry Regulatory Authority (“FINRA”). As used herein, a “Debt Repayment Triggering Event” means any event or condition which gives, or with the giving of notice or lapse of time would give, the holder of any note, debenture or other evidence of indebtedness (or any person acting on such holder’s behalf) the right to require the repurchase, redemption or repayment of all or a portion of such indebtedness by the Company or any of its Subsidiaries.

(r) No Material Actions or Proceedings. There are no legal or governmental actions, suits or proceedings pending or, to the Company’s knowledge, threatened (i) against or

affecting the Company or any of its Subsidiaries, (ii) which have as the subject thereof any officer or director (in his or her capacity as such) of, or property owned or leased by, the Company or any of its Subsidiaries or (iii) relating to environmental or discrimination matters, where in any such case (A) there is a reasonable possibility that such action, suit or proceeding might be determined adversely to the Company, such Subsidiary or such officer or director, (B) any such action, suit or proceeding, if so determined adversely, would reasonably be expected to result in a Material Adverse Change or materially and adversely affect the consummation of the transactions contemplated by this Agreement or (C) any such action, suit or proceeding is or would be material in the context of the sale of the Offered Shares. No material labor dispute with the employees of the Company or any of its Subsidiaries, or with the employees of any principal supplier, manufacturer, customer or contractor of the Company, exists or, to the best of the Company’s knowledge, is threatened or imminent.

(s) Intellectual Property Rights. The Company and its Subsidiaries own or possess sufficient trademarks, trade names, patent rights, copyrights, domain names, licenses, approvals, trade secrets and other similar rights (collectively, “Intellectual Property Rights”) reasonably necessary to conduct their businesses as now conducted. Neither the Company nor any of its Subsidiaries has received, or has any reason to believe that it will receive, any notice of infringement or conflict with asserted Intellectual Property Rights of others. The Company is not a party to or bound by any options, licenses or agreements with respect to the Intellectual Property Rights of any other person or entity that are required to be set forth in the Canadian Prospectus and the Prospectus and are not described therein. (The Time of Sale Prospectus contains in all material respects the same description of the matters set forth in the preceding sentence contained in the Canadian Prospectus and the Prospectus.) None of the technology employed by the Company or any of its Subsidiaries has been obtained or is being used by the Company or any of its Subsidiaries in violation of any material contractual obligation binding on the Company or any of its Subsidiaries or, to the Company’s knowledge, any of its or its Subsidiaries’ officers, directors or employees or otherwise in violation of the rights of any persons.

(t) All Necessary Permits, etc. Each of the Company and its Subsidiaries possesses such valid and current certificates, authorizations or permits issued by the appropriate federal, provincial, state, local or foreign regulatory agencies or bodies necessary to conduct its business, except where the failure to possess such certificates, authorizations or permits would not, individually or in the aggregate, result in a Material Adverse Change, and neither the Company nor any of its Subsidiaries has received, or has any reason to believe that it will receive, any notice of proceedings relating to the revocation or modification of, or non-compliance with, any such certificate, authorization or permit which, singly or in the aggregate, if the subject of an unfavorable decision, ruling or finding, could result in a Material Adverse Change.

(u) Title to Properties. The Company and each of its Subsidiaries has good and marketable title to all of the real and personal property and other assets reflected as owned in the financial statements referred to in Section 1(l) above (or elsewhere in any Applicable Prospectus), in each case free and clear of any security interests, mortgages, liens, encumbrances, equities, adverse claims and other defects, except such as do not materially and adversely affect the value of such property and do not materially interfere with the use made or proposed to be made of such property by the Company or such Subsidiary. The real property, improvements, equipment and personal property held under lease by the Company or any Subsidiary are held under valid and enforceable leases, with such exceptions as are not

material and do not materially interfere with the use made or proposed to be made of such real property, improvements, equipment or personal property by the Company or such Subsidiary.

(v) Tax Law Compliance. The Company and its consolidated Subsidiaries have filed all necessary United States federal, Canadian federal and all other foreign, provincial, state, local or other income and franchise tax returns or have properly requested extensions thereof and have paid all taxes required to be paid by any of them and, if due and payable, any related or similar assessment, fine or penalty levied against any of them except as may be being contested in good faith and by appropriate proceedings, except for such failure to pay as would not, individually or in the aggregate, result in a Material Adverse Change. The Company has made adequate charges, accruals and reserves in the applicable financial statements referred to in Section 1(l) above in respect of all United States federal, Canadian federal, state, provincial and foreign income and franchise taxes for all periods as to which the tax liability of the Company or any of its consolidated Subsidiaries has not been finally determined.

(w) Company Not an “Investment Company”; PFIC. The Company has been advised of the rules and requirements under the Investment Company Act of 1940, as amended (the “Investment Company Act”). The Company is not, and will not be, either at the time of receipt of payment for the Offered Shares or after the application of the proceeds therefrom as described under “Use of Proceeds” in each Applicable Prospectus, an “investment company” within the meaning of the Investment Company Act and will conduct its business in a manner so that it will not become subject to the Investment Company Act. For each taxable year, if any, that the Company qualifies as a “passive foreign investment company” (a “PFIC”), as defined in Section 1297(a) of the Internal Revenue Code of 1986, as amended (the “Code”), in the case of a purchaser of Offered Shares that is a “United States person,” as defined in Section 7701(a)(30) of the Code, and that is making or has made an effective “qualified electing fund” election, as defined in Section 1295 of the Code with respect to the Company (a “QEF Election”), the Company will provide to such purchaser: (a) a “PFIC Annual Information Statement” as described in Treasury Regulation Section 1.1295-1(g) (or any successor Treasury Regulation), including all representations and statements required by such PFIC Annual Information Statement, and (b) all additional information that such purchaser is required to obtain in connection with making or maintaining a QEF Election. The Company shall also take such other actions as may reasonably be necessary to facilitate and maintain a QEF Election by any such purchaser. With regard to the PFIC Annual Information Statement, (i) the Company must provide a PFIC Annual Information Statement described in Treasury Regulation Section 1.1295-1(g)(1), and (ii) as permitted by Treasury Regulation Section 1.1293-1(a)(2)(A), the Company will calculate and report the amount of each category of long-term capital gain described in Section 1(h) of the Code that was recognized by the Company.

(x) Insurance. Each of the Company and its material Subsidiaries is insured by recognized, financially sound and reputable institutions with policies in such amounts and with such deductibles and covering such risks as are generally deemed adequate and customary for its business including, but not limited to, policies covering real and personal property owned or leased by the Company and its material Subsidiaries against theft, damage, destruction, acts of vandalism and earthquakes and policies covering the Company and its material Subsidiaries for product liability claims. The Company has no reason to believe that it or any Subsidiary will not be able (i) to renew its existing insurance coverage as and when such policies expire or (ii) to obtain comparable coverage from similar institutions as may be

necessary or appropriate to conduct its business as now conducted and at a cost that would not result in a Material Adverse Change. Neither the Company nor any material Subsidiary has been denied any insurance coverage which it has sought or for which it has applied.

(y) No Price Stabilization or Manipulation; Compliance with Regulation M. The Company has not taken, directly or indirectly, any action designed to or that might be reasonably expected to cause or result in stabilization or manipulation of the price of the Shares or any other “reference security” (as defined in Rule 100 of Regulation M under the Exchange Act (“Regulation M”)) whether to facilitate the sale or resale of the Offered Shares or otherwise, and has taken no action which would directly or indirectly violate Regulation M.

(z) Related Party Transactions. There are no business relationships or related-party transactions involving the Company or any of its Subsidiaries or any other person required to be described in each Applicable Prospectus which have not been described as required. (The Time of Sale Prospectus contains in all material respects the same description of the matters set forth in the preceding sentence contained in the Prospectus.)

(aa) FINRA Matters. All of the information provided to the Underwriters or to counsel for the Underwriters by the Company and, to the knowledge of the Company, its officers and directors and the holders of any securities (debt or equity) or options to acquire any securities of the Company in connection with letters, filings or other supplemental information provided to FINRA pursuant to NASD Conduct Rule 2710 or 2720 is true, complete and correct.

(bb) Parties to Lock-Up Agreements. Each of the Company’s directors and officers and each of the other persons and entities listed in Exhibit A has executed and delivered to Jefferies a lock-up agreement in the form of Exhibit B hereto. Exhibit A hereto contains a true, complete and correct list of all directors and officers of the Company. If any additional persons shall become directors or officers of the Company prior to the end of the Lock-up Period (as defined below), the Company shall cause each such person, prior to or contemporaneously with their appointment or election as a director or officer of the Company, to execute and deliver to Jefferies an agreement in the form attached hereto as Exhibit B.

(cc) Statistical and Market-Related Data. The statistical, demographic and market-related data included in the Registration Statement and each Applicable Prospectus are based on or derived from sources that the Company believes to be reliable and accurate or represent the Company’s good faith estimates that are made on the basis of data derived from such sources.

(dd) No Unlawful Contributions or Other Payments. Neither the Company nor any of its Subsidiaries nor, to the Company’s knowledge, any employee or agent of the Company or any Subsidiary, has made any contribution or other payment to any official of, or candidate for, any federal, provincial, state, local, municipal or foreign office in violation of any law or of the character that is required to be disclosed in the Registration Statement and each Applicable Prospectus.

(ee) Compliance with Environmental Laws. Except as described in each Applicable Prospectus and except as would not, singly or in the aggregate, result in a Material Adverse Change, (i) neither the Company nor any of its Subsidiaries is in violation of any federal, provincial, state, local, municipal or foreign statute, law, rule, regulation, ordinance, code,

policy or rule of common law or any judicial or administrative interpretation thereof, including any judicial or administrative order, consent, decree or judgment, relating to pollution or protection of human health, the environment (including, without limitation, ambient air, surface water, groundwater, land surface or subsurface strata) or wildlife, including, without limitation, laws and regulations relating to the release or threatened release of chemicals, pollutants, contaminants, wastes, toxic substances, hazardous substances, petroleum or petroleum products (collectively, “Hazardous Materials”) or to the manufacture, processing, distribution, use, treatment, storage, disposal, transport or handling of Hazardous Materials (collectively, “Environmental Laws”), (ii) the Company and its Subsidiaries have all permits, authorizations and approvals required under any applicable Environmental Laws and are in compliance with their requirements, (iii) there are no pending or threatened administrative, regulatory or judicial actions, suits, demands, demand letters, claims, liens, notices of noncompliance or violation, investigation or proceedings relating to any Environmental Law against the Company or any of its Subsidiaries and (iv) there are no events or circumstances that might reasonably be expected to form the basis of an order for clean-up or remediation, or an action, suit or proceeding by any private party or governmental body or agency, against or affecting the Company or any of its Subsidiaries relating to Hazardous Materials or any Environmental Laws.

(ff) Brokers. Except as otherwise disclosed in the Time of Sale Prospectus and the Prospectus or on Exhibit C hereto, there is no broker, finder or other party that is entitled to receive from the Company any brokerage or finder’s fee or other fee or commission as a result of any transactions contemplated by this Agreement, other than the Underwriters.

(gg) No Outstanding Loans or Other Extensions of Credit. Since July 21, 2008, neither the Company nor any of its Subsidiaries has extended or maintained credit, arranged for the extension of credit, or renewed any extension of credit, in the form of a personal loan, to or for any director or executive officer (or equivalent thereof) of the Company and/or such Subsidiary except for such extensions of credit as are expressly permitted by Section 13(k) of the Exchange Act, and no loan made prior to such filing remains outstanding.

(hh) Compliance with Laws. The Company has not been advised, and has no reason to believe, that it or any of its Subsidiaries is not conducting business in compliance with all applicable laws, rules and regulations of the jurisdictions in which it is conducting business, except where failure to be so in compliance would not result in a Material Adverse Change.

(ii) Dividend Restrictions. Except (i) as disclosed in each Applicable Prospectus, (ii) as may be restricted by applicable law, or (iii) as provided in the Amended and Restated Joint Venture Agreement, among Cummins Inc., Westport Innovations Inc. and Cummins Westport Inc. (“CWI”), dated as of January 1, 2004, no Subsidiary of the Company is prohibited or restricted, directly or indirectly, from paying dividends to the Company, or from making any other distribution with respect to such Subsidiary’s equity securities or from repaying to the Company or any other Subsidiary of the Company any amounts that may from time to time become due under any loans or advances to such Subsidiary from the Company or from transferring any property or assets to the Company or to any other Subsidiary.

(jj) Foreign Corrupt Practices Act. Neither the Company nor any of its Subsidiaries nor, to the knowledge of the Company, any director, officer, agent, employee, affiliate or other person acting on behalf of the Company or any of its Subsidiaries is aware of or has taken any action, directly or indirectly, that has resulted or would result in a violation of the Foreign

Corrupt Practices Act of 1977, as amended, and the rules and regulations thereunder (the “FCPA”), including, without limitation, making use of the mails or any means or instrumentality of interstate commerce corruptly in furtherance of an offer, payment, promise to pay or authorization of the payment of any money, or other property, gift, promise to give, or authorization of the giving of anything of value to any “foreign official” (as such term is defined in the FCPA) or any foreign political party or official thereof or any candidate for foreign political office, in contravention of the FCPA; and the Company and its Subsidiaries and, to the knowledge of the Company, the Company’s affiliates will monitor their respective businesses to ensure compliance with the FCPA and, if violations of the FCPA are found, will take remedial action to remedy such violations.

(kk) Money Laundering Laws. The operations of the Company and its Subsidiaries are, and have been conducted at all times, in compliance with all material applicable financial recordkeeping and reporting requirements of the Currency and Foreign Transactions Reporting Act of 1970, as amended, the Proceeds of Crime (Money Laundering) and Terrorist Financing Act (Canada), the money laundering statutes of all applicable jurisdictions, the rules and regulations thereunder and any related or similar applicable rules, regulations or guidelines, issued, administered or enforced by any governmental agency (collectively, the “Money Laundering Laws”) and no action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator involving the Company or any of its Subsidiaries with respect to the Money Laundering Laws is pending or, to the knowledge of the Company, threatened.

(ll) OFAC. Neither the Company nor any of its Subsidiaries nor, to the knowledge of the Company, any director, officer, agent, employee, affiliate or person acting on behalf of the Company or any of its Subsidiaries is currently subject to any U.S. sanctions administered by the Office of Foreign Assets Control of the U.S. Treasury Department (“OFAC”); and the Company will not directly or indirectly use the proceeds of this offering, or lend, contribute or otherwise make available such proceeds to any subsidiary, joint venture partner or other person or entity, for the purpose of financing the activities of any person currently subject to any U.S. sanctions administered by OFAC.

(mm) Disclosure Controls and Procedures. The Company has established and maintains “disclosure controls and procedures” and “internal control over financial reporting” within the meaning of such terms under Multilateral Instrument 52-109 – Certification of Disclosure in Issuers’ Annual and Interim Filings of the Canadian Securities Administrators and is in compliance with the certification requirements thereof with respect to the Company’s annual and interim filings with Canadian securities regulators.

(nn) Audit Committee. The audit committee of the Company is comprised and operates in accordance with all material requirements of Multilateral Instrument 52-110 – Audit Committees of the Canadian Securities Administrators.

With respect to the representations and warranties relating to CWI in paragraphs (q), (r), (s), (t), (u), (v), (x), (dd), (hh), (jj), (kk) and (ll) of Section 1, such representations and warranties shall be deemed made pursuant to the knowledge of the Company, which shall mean the knowledge of the executive officers of the Company after reasonable inquiry.

Any certificate signed by any officer of the Company or any of its Subsidiaries and delivered to the Representative or to counsel for the Underwriters, as

contemplated by this Agreement, shall be deemed a representation and warranty by the Company to each Underwriter as to the matters covered thereby.

The Company acknowledges that the Underwriters and, for purposes of the opinions to be delivered pursuant to Section 6 hereof, counsel to the Company and counsel to the Underwriters will rely upon the accuracy and truthfulness of the foregoing representations and hereby consents to such reliance.

Section 2. Purchase, Sale and Delivery of the Offered Shares.

(a) The Firm Shares. Upon the terms herein set forth, the Company agrees to issue and sell to the several Underwriters an aggregate of 4,500,000 Firm Shares. On the basis of the representations, warranties and agreements herein contained, and upon the terms but subject to the conditions herein set forth, the Underwriters agree, severally and not jointly, to purchase from the Company the respective number of Firm Shares set forth opposite their names on Schedule A. The purchase price per Firm Share to be paid by the several Underwriters to the Company shall be U.S.$[ ] per share (Cdn.$[ ] per share with respect to sales to Canadian investors in Canadian dollars).

(b) The First Closing Date. Delivery of certificates for the Firm Shares to be purchased by the Underwriters and payment therefor shall be made at the offices of Jefferies, 520 Madison Avenue, New York, New York (or such other place as may be agreed to by the Company and the Representative) at 9:00 a.m. New York time, on August [ ], 2008 or such other time and date not later than 1:30 p.m. New York time, on September [ ], 2008 as the Representative shall designate by notice to the Company (the time and date of such closing are called the “First Closing Date”). The Company hereby acknowledges that circumstances under which the Representative may provide notice to postpone the First Closing Date as originally scheduled include, but are in no way limited to, any determination by the Company or the Representative to recirculate to the public copies of an amended or supplemented Prospectus or a delay as contemplated by the provisions of Section 10.

(c) The Optional Shares; Option Closing Date. In addition, on the basis of the representations, warranties and agreements herein contained, and upon the terms but subject to the conditions herein set forth, the Company hereby grants an option to the several Underwriters to purchase, severally and not jointly, up to an aggregate of 675,000 Optional Shares from the Company at the purchase price per share to be paid by the Underwriters for the Firm Shares. The option granted hereunder may be exercised at any time and from time to time in whole or in part upon notice by the Representative to the Company, which notice may be given at any time within 30 days from the date of this Agreement. Such notice shall set forth (i) the aggregate number of Optional Shares as to which the Underwriters are exercising the option, (ii) the names and denominations in which the certificates for the Optional Shares are to be registered and (iii) the time, date and place at which such certificates will be delivered (which time and date may be simultaneous with, but not earlier than, the First Closing Date; and in the event that such time and date are simultaneous with the First Closing Date, the term “First Closing Date” shall refer to the time and date of delivery of certificates for the Firm Shares and such Optional Shares). Any such time and date of delivery, if subsequent to the First Closing Date, is called an “Option Closing Date” and shall be determined by the Representative and shall not be earlier than three nor later than five full business days after the date of delivery of such notice of exercise. If any Optional Shares are to be purchased, each Underwriter agrees, severally and not jointly, to purchase the number of Optional Shares (subject to such adjustments to eliminate fractional shares as

the Representative may determine) that bears the same proportion to the total number of Optional Shares to be purchased as the number of Firm Shares set forth on Schedule A opposite the name of such Underwriter bears to the total number of Firm Shares. The Representative may cancel the option at any time prior to its expiration by giving written notice of such cancellation to the Company.

(d) Public Offering of the Offered Shares. The Representative hereby advises the Company that the Underwriters intend to offer for sale to the public, initially on the terms set forth in the Time of Sale Prospectus and each Applicable Prospectus, their respective portions of the Offered Shares as soon after this Agreement has been executed and the Registration Statement has been declared effective as the Representative, in its sole judgment, has determined is advisable and practicable.

(e) Payment for the Offered Shares. Payment for the Offered Shares shall be made at the First Closing Date (and, if applicable, at each Option Closing Date) by wire transfer of immediately available funds to the order of the Company.

It is understood that the Representative has been authorized, for its own account and the accounts of the several Underwriters, to accept delivery of and receipt for, and make payment of the purchase price for, the Firm Shares and any Optional Shares the Underwriters have agreed to purchase. Jefferies, individually and not as the Representative of the Underwriters, may (but shall not be obligated to) make payment for any Offered Shares to be purchased by any Underwriter whose funds shall not have been received by the Representative by the First Closing Date or the applicable Option Closing Date, as the case may be, for the account of such Underwriter, but any such payment shall not relieve such Underwriter from any of its obligations under this Agreement.

(f) Delivery of the Offered Shares. The Company shall deliver, or cause to be delivered, to the Representative for the accounts of the several Underwriters certificates for the Firm Shares at the First Closing Date, against the irrevocable release of a wire transfer of immediately available funds for the amount of the purchase price therefor. The Company shall also deliver, or cause to be delivered, to the Representative for the accounts of the several Underwriters, certificates for the Optional Shares the Underwriters have agreed to purchase at the First Closing Date or the applicable Option Closing Date, as the case may be, against the irrevocable release of a wire transfer of immediately available funds for the amount of the purchase price therefor. The certificates for the Offered Shares shall be in definitive form and registered in such names and denominations as the Representative shall have requested at least two full business days prior to the First Closing Date (or the applicable Option Closing Date, as the case may be) and shall be made available for inspection on the business day preceding the First Closing Date (or the applicable Option Closing Date, as the case may be) at a location in New York City as the Representative may designate. Time shall be of the essence, and delivery at the time and place specified in this Agreement is a further condition to the obligations of the Underwriters.

Section 3. Additional Covenants.

The Company further covenants and agrees with each Underwriter as follows:

(a) Delivery of Registration Statement, Time of Sale Prospectus and Prospectus. The Company shall furnish to you, without charge, five signed copies of the Registration Statement and any amendments thereto (including exhibits thereto), and for delivery to each

other Underwriter a conformed copy of the Registration Statement and any amendments thereto (without exhibits thereto), and shall furnish to you in New York City, without charge, prior to 10:00 a.m. New York City time on the business day next succeeding the date of this Agreement and during the period mentioned in Section 3(e) or 3(f) below, as many copies of the Time of Sale Prospectus, the Canadian Prospectus, the Prospectus and any supplements and amendments thereto or to the Registration Statement as you may reasonably request.

(b) Representative’s Review of Proposed Amendments and Supplements. Prior to amending or supplementing the Registration Statement, the Preliminary Prospectus, the Time of Sale Prospectus, the Canadian Prospectus or the Prospectus (including any amendment or supplement through incorporation by reference of any document), the Company shall furnish to the Representative for review, a reasonable amount of time prior to the proposed time of filing or use thereof, a copy of each such proposed amendment or supplement, and the Company shall not file or use any such proposed amendment or supplement without the Representative’s consent.

(c) Free Writing Prospectuses. The Company shall furnish to the Representative for review, a reasonable amount of time prior to the proposed time of filing or use thereof, a copy of each proposed free writing prospectus or any amendment or supplement thereto to be prepared by or on behalf of, used by, or referred to by the Company and the Company shall not file, use or refer to any proposed free writing prospectus or any amendment or supplement thereto without the Representative’s consent. The Company shall furnish to each Underwriter, without charge, as many copies of any free writing prospectus prepared by or on behalf of, or used by, the Company as such Underwriter may reasonably request. If at any time when a prospectus is required by the Securities Act (including, without limitation, pursuant to Rule 173(d) under the Securities Act) to be delivered in connection with sales of the Offered Shares (but in any event at any time through and including the First Closing Date) there occurred or occurs an event or development as a result of which any free writing prospectus prepared by or on behalf of, used by, or referred to by the Company conflicted or would conflict with the information contained in the Registration Statement or included or would include an untrue statement of a material fact or omitted or would omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances prevailing at that subsequent time, not misleading, the Company shall promptly amend or supplement such free writing prospectus to eliminate or correct such conflict or so that the statements in such free writing prospectus as so amended or supplemented will not include an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances prevailing at such subsequent time, not misleading, as the case may be; provided, however, that prior to amending or supplementing any such free writing prospectus, the Company shall furnish to the Representative for review, a reasonable amount of time prior to the proposed time of filing or use thereof, a copy of such proposed amended or supplemented free writing prospectus and the Company shall not file, use or refer to any such amended or supplemented free writing prospectus without the Representative’s consent.

(d) Filing of Underwriter Free Writing Prospectuses. The Company shall not take any action that would result in an Underwriter or the Company being required to file with the Commission pursuant to Rule 433(d) under the Securities Act a free writing prospectus prepared by or on behalf of the Underwriter that the Underwriter otherwise would not have been required to file thereunder.

(e) Amendments and Supplements to Time of Sale Prospectus. If the Time of Sale Prospectus is being used to solicit offers to buy the Offered Shares at a time when the Prospectus or Canadian Prospectus is not yet available to prospective purchasers and any event shall occur or condition exist as a result of which it is necessary to amend or supplement the Time of Sale Prospectus so that the Time of Sale Prospectus does not include an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances when delivered to a prospective purchaser, not misleading, or if any event shall occur or condition exist as a result of which the Time of Sale Prospectus conflicts with the information contained in the Registration Statement, or if, in the opinion of counsel for the Underwriters, it is necessary to amend or supplement the Time of Sale Prospectus to comply with applicable law, including the Securities Act, the Company shall (subject to Sections 3(b) and 3(c)) forthwith prepare, file with the Commission and furnish, at its own expense, to the Underwriters and to any dealer upon request, either amendments or supplements to the Time of Sale Prospectus so that the statements in the Time of Sale Prospectus as so amended or supplemented will not include an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances when delivered to a prospective purchaser, not misleading or so that the Time of Sale Prospectus, as amended or supplemented, will no longer conflict with the Registration Statement, or so that the Time of Sale Prospectus, as amended or supplemented, will comply with applicable law including the Securities Act.

(f) Securities Act Compliance. The Company will prepare the PREP Prospectus Supplement and the U.S. Prospectus Supplement in a form approved by the Representative and (i) will file the PREP Prospectus Supplement with the BCSC in accordance with the PREP Procedures not later than the BCSC’s close of business on the second business day following the execution and delivery of this Agreement, and (ii) will file such U.S. Prospectus Supplement with the Commission pursuant to General Instruction II.L of Form F-10 not later than the Commission’s close of business on the first business day following the day on which the filing of the PREP Prospectus Supplement is made with the BCSC. After the date of this Agreement, the Company shall promptly advise the Representative in writing (i) of the receipt of any comments of, or requests for additional or supplemental information or other communication from, any Canadian Commission or the Commission with respect to the Canadian Prospectus or the Registration Statement, (ii) of any request by any Canadian Commission to amend or supplement the Canadian Prospectus or for additional information or of any request by the Commission to amend the Registration Statement or to amend or supplement the Prospectus or for additional information, (iii) of the time and date of any filing of any post-effective amendment to the Registration Statement or any amendment or supplement to the Preliminary Prospectus, the Time of Sale Prospectus, any free writing prospectus or the Prospectus, (iv) of the time and date that any post-effective amendment to the Registration Statement becomes effective, (v) of the issuance by the Commission or any Canadian Commission, as applicable, of any stop order suspending the effectiveness of the Registration Statement or any post-effective amendment thereto or any order directed at any document incorporated by reference in the Registration Statement, the Prospectus or the Canadian Prospectus or any amendment or supplement thereto or any order preventing or suspending the use of the Preliminary Prospectus, the Time of Sale Prospectus, any free writing prospectus, the Prospectus or the Canadian Prospectus or any amendment or supplement thereto or any post-effective amendment to the Registration Statement, or the suspension of the qualification of the Offered Shares for sale in any jurisdiction, or of any proceedings to remove, suspend or terminate from listing or quotation the Shares from any securities exchange upon which they are listed for trading or included or designated for

quotation, or of the threatening or initiation of any proceedings for any of such purposes, and (vi) of the issuance by any Canadian Commission of any order having the effect of ceasing or suspending the distribution of the Offered Shares, or of the institution or, to the knowledge of the Company, threatening of any proceedings for any such purpose. If the Commission or any Canadian Commission shall enter any such stop order at any time, the Company will use its best efforts to obtain the lifting of such order at the earliest possible moment.

(g) Amendments and Supplements to the Prospectus and Other Securities Act Matters. The Company will comply with the Securities Act, the Exchange Act and the Canadian Securities Laws so as to permit the completion of the distribution of the Offered Shares as contemplated in this Agreement and the Prospectus and the Canadian Prospectus. If any event shall occur or condition exist as a result of which it is necessary to amend or supplement the Prospectus or the Canadian Prospectus so that the Prospectus and the Canadian Prospectus do not include an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances when the Prospectus or the Canadian Prospectus is delivered to a purchaser, not misleading, or if in the opinion of the Representative or counsel for the Underwriters it is otherwise necessary to amend or supplement the Prospectus or the Canadian Prospectus to comply with applicable law, including the Securities Act and Canadian Securities Laws, the Company agrees (subject to Section 3(b) and 3(c)) to promptly prepare, file with the Commission and the Canadian Commissions and furnish at its own expense to the Underwriters and to dealers, amendments or supplements to the Prospectus and the Canadian Prospectus so that the statements in the Prospectus and the Canadian Prospectus as so amended or supplemented will not include an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances when the Prospectus or the Canadian Prospectus is delivered to a purchaser, not be misleading or so that the Prospectus and the Canadian Prospectus, as amended or supplemented, will comply with applicable law, including the Securities Act and Canadian Securities Laws, as applicable. Neither the Representative’s consent to, nor delivery of, any such amendment or supplement shall constitute a waiver of any of the Company’s obligations under Sections 3(b) or (c).

(h) Blue Sky Compliance. The Company shall cooperate with the Representative and counsel for the Underwriters to qualify or register the Offered Shares for sale under (or obtain exemptions from the application of) the state securities or blue sky laws or Canadian provincial securities laws (or foreign laws) of those jurisdictions designated by the Representative, shall comply with such laws and shall continue such qualifications, registrations and exemptions in effect so long as required for the distribution of the Offered Shares. The Company shall not be required to qualify as a foreign corporation or to take any action that would subject it to general service of process in any jurisdiction in which it is not presently qualified or where it would be subject to taxation as a foreign corporation. The Company will advise the Representative promptly of the suspension of the qualification or registration of (or any exemption relating to) the Offered Shares for offering, sale or trading in any jurisdiction or any initiation or threat of any proceeding for any such purpose, and in the event of the issuance of any order suspending such qualification, registration or exemption, the Company shall use its best efforts to obtain the withdrawal thereof at the earliest possible moment.

(i) Use of Proceeds. The Company shall apply the net proceeds from the sale of the Offered Shares sold by it in the manner described under the caption “Use of Proceeds” in each Applicable Prospectus.

(j) Transfer Agent. The Company shall engage and maintain, at its expense, a registrar and transfer agent for the Shares both in Canada and the United States.

(k) Earnings Statement. As soon as practicable, but in any event no later than eighteen months after the date of this Agreement, the Company will make generally available to its security holders and to the Representative an earnings statement (which need not be audited) covering a period of at least twelve months beginning with the first fiscal quarter of the Company commencing after the date of this Agreement which shall satisfy the provisions of Section 11(a) of the Securities Act and the rules and regulations of the Commission thereunder.

(l) Periodic Reporting Obligations. The Company shall file, on a timely basis, with the Commission and the Nasdaq Global Market all reports and documents required to be filed under the Exchange Act. Additionally, the Company shall report the use of proceeds from the issuance of the Offered Shares as may be required under Rule 463 under the Securities Act, if applicable.

(m) Listing. The Company will use its commercially reasonable efforts to effect and maintain the listing of the Offered Shares on the TSX and the Nasdaq Global Market and to maintain the listing of the Shares on the TSX and the Nasdaq Global Market unless the shareholders of the Company approve a transaction where such listing is terminated.

(n) Agreement Not to Offer or Sell Additional Shares. During the period commencing on and including the date hereof and ending on and including the 90th day following the date of this Agreement (as the same may be extended as described below, the “Lock-up Period”), the Company will not, without the prior written consent of Jefferies (which consent may be withheld at the sole discretion of Jefferies), directly or indirectly, sell (including, without limitation, any short sale), offer, contract or grant any option to sell, pledge, transfer or establish an open “put equivalent position” within the meaning of Rule 16a-1(h) under the Exchange Act, or otherwise dispose of or transfer, or announce the offering of, or file any registration statement under the Securities Act in respect of, any Shares, options, rights or warrants to acquire Shares or securities exchangeable or exercisable for or convertible into Shares (other than as contemplated by this Agreement with respect to the Offered Shares) or publicly announce the intention to do any of the foregoing; provided, however, that the Company may issue Shares, options to purchase Shares or performance share units, or issue Shares upon exercise of options, pursuant to any stock option, stock bonus or other stock plan or arrangement, may issue Shares upon exercise of warrants outstanding on the date hereof and may issue warrants to purchase Shares, and Shares upon exercise thereof, to the Canadian Industrial Technologies Office, in each case as described in each Applicable Prospectus. Notwithstanding the foregoing, if (i) during the last 17 days of the Lock-up Period, the Company issues an earnings release or material news or a material event relating to the Company occurs or (ii) prior to the expiration of the Lock-up Period, the Company announces that it will release earnings results during the 16-day period beginning on the last day of the Lock-up Period, then in each case the Lock-up Period will be extended until the expiration of the 18-day period beginning on the date of the issuance of the earnings release or the occurrence of the material news or material event, as applicable, unless Jefferies waives, in writing, such extension (which waiver may be withheld at the sole discretion of Jefferies). The Company will provide the Representative with prior notice of any such announcement that gives rise to an extension of the Lock-up Period.

(o) Investment Limitation. The Company shall not invest or otherwise use the proceeds received by the Company from its sale of the Offered Shares in such a manner as would require the Company or any of its Subsidiaries to register as an investment company under the Investment Company Act.

(p) No Stabilization or Manipulation; Compliance with Regulation M. The Company will not take, directly or indirectly, any action designed to or that might be reasonably expected to cause or result in stabilization or manipulation of the price of the Shares or any other reference security, whether to facilitate the sale or resale of the Offered Shares or otherwise, and the Company will, and shall cause each of its affiliates to, comply with all applicable provisions of Regulation M. If the limitations of Rule 102 of Regulation M (“Rule 102”) do not apply with respect to the Offered Shares or any other reference security pursuant to any exception set forth in Section (d) of Rule 102, then promptly upon notice from the Representative (or, if later, at the time stated in the notice), the Company will, and shall cause each of its affiliates to, comply with Rule 102 as though such exception were not available but the other provisions of Rule 102 (as interpreted by the Commission) did apply.

(q) Existing Lock-Up Agreements. During the Lock-up Period, the Company will enforce all existing agreements between the Company and any of its security holders that prohibit the sale, transfer, assignment, pledge or hypothecation of any of the Company’s securities. In addition, the Company will direct the transfer agent to place stop transfer restrictions upon any such securities of the Company that are bound by such existing “lock-up” agreements for the duration of the periods contemplated in such agreements, including, without limitation, “lock-up” agreements entered into by the Company’s officers and directors pursuant to Section 6(j).

Jefferies, on behalf of the several Underwriters, may, in its sole discretion, waive in writing the performance by the Company of any one or more of the foregoing covenants or extend the time for their performance.

Section 4. Payment of Expenses. The Company agrees to pay all costs, fees and expenses incurred in connection with the performance of its obligations hereunder and in connection with the transactions contemplated hereby, including without limitation (i) all expenses incident to the issuance, delivery and qualification of the Offered Shares in the United States and Canada (including all printing and engraving costs), (ii) all fees and expenses of the registrar and transfer agent of the Shares, (iii) all necessary issue, transfer and other stamp taxes in connection with the issuance and sale of the Offered Shares to the Underwriters, (iv) all fees and expenses of the Company’s counsel, independent public or certified public accountants and other advisors, (v) all costs and expenses incurred in connection with the preparation, printing, filing, shipping and distribution of the Registration Statement (including financial statements, exhibits, schedules, consents and certificates of experts), the Time of Sale Prospectus, the Prospectus, the Canadian Prospectus, any free writing prospectus prepared by or on behalf of, used by, or referred to by the Company, and the Preliminary Prospectus, all amendments and supplements thereto, and this Agreement, (vi) all filing fees, attorneys’ fees and expenses incurred by the Company or the Underwriters in connection with qualifying or registering (or obtaining exemptions from the qualification or registration of) all or any part of the Offered Shares for offer and sale under the state securities or blue sky laws or the provincial securities laws of Canada or any other country, and, if requested by the Representative, preparing and printing a “Blue Sky Survey” or other memorandum and any supplements thereto, advising the Underwriters of such qualifications, registrations and exemptions, (vii) the filing fees incident to, and the reasonable fees and

expenses of counsel for the Underwriters in connection with, FINRA’s review, if any, and approval of the Underwriters’ participation in the offering and distribution of the Offered Shares (provided, however, that expenses of counsel to the Underwriters under subsections (vi) and (vii) shall not exceed U.S.$10,000 in the aggregate), (viii) all travel expenses, including air fare and accommodation expenses, of representatives of the Company in connection with any “road show” undertaken in connection with the marketing of the offering of the Shares, and (ix) the fees and expenses associated with listing the Offered Shares on the Nasdaq Global Market and the TSX. Except as provided in this Section 4, Section 7, Section 8 and Section 9 hereof, the Underwriters shall pay their own expenses, including the fees and disbursements of their counsel.

Section 5. Covenant of the Underwriters. Each Underwriter, severally and not jointly, covenants with the Company not to take any action that would result in the Company being required to file with the Commission pursuant to Rule 433(d) under the Securities Act a free writing prospectus prepared by or on behalf of such Underwriter that otherwise would not be required to be filed by the Company thereunder, but for the action of the Underwriter

Section 6. Conditions to the Obligations of the Underwriters. The obligations of the several Underwriters to purchase and pay for the Offered Shares as provided herein on the First Closing Date and, with respect to the Optional Shares, each Option Closing Date shall be subject to the accuracy of the representations and warranties on the part of the Company set forth in Section 1 hereof as of the date hereof and as of the First Closing Date as though then made and, with respect to the Optional Shares, as of each Option Closing Date as though then made, to the timely performance by the Company of its covenants and other obligations hereunder, and to each of the following additional conditions:

(a) Accountants’ Comfort Letter. On the date hereof, the Representative shall have received from KPMG LLP, independent public or certified public accountants for the Company, (i) a letter dated the date hereof addressed to the Underwriters, in form and substance satisfactory to the Representative, containing statements and information of the type ordinarily included in accountant’s “comfort letters” to underwriters with respect to the audited and unaudited financial statements and certain financial information contained in the Registration Statement, the Preliminary Prospectus, the Canadian Prospectus and the Prospectus (and the Representative shall have received an additional five conformed copies of such accountants’ letter for each of the several Underwriters), and (ii) confirming that they are (A) independent public, certified public or chartered accountants as required by the Securities Act, the Exchange Act and all Canadian Securities Laws and (B) in compliance with the applicable requirements relating to the qualification of accountants under Rule 2-01 of Regulation S-X.

(b) Compliance with Registration Requirements; No Stop Order; No Objection from FINRA. For the period from and after effectiveness of this Agreement and prior to the First Closing Date and, with respect to the Optional Shares, each Option Closing Date:

(i) no stop order suspending the effectiveness of the Registration Statement, or any post-effective amendment to the Registration Statement, shall be in effect and no proceedings for such purpose shall have been instituted or threatened by the Commission;

(ii) no order preventing or suspending the use of the Canadian Prospectus shall have been issued and no proceeding for that purpose shall have been initiated or threatened by any Canadian Commission or other securities regulatory authority in Canada;

(iii) no order having the effect of ceasing or suspending the distribution of the Offered Shares or any other securities of the Company shall have been issued by any securities regulatory authority or stock exchange in Canada or the United States and no proceedings for that purpose shall have been instituted or shall be pending or, to the knowledge of the Company, shall be contemplated by any such securities regulatory authority or stock exchange;

(iv) a PREP Prospectus Supplement shall have been filed with the Canadian Commissions in accordance with the PREP Procedures and a U.S. Prospectus Supplement shall have been filed with the Commission in accordance with General Instruction II.L of Form F-10;

(v) all requests for additional information on the part of the Commission or any Canadian Commission shall have been complied with; and

(vi) FINRA shall have raised no objection to the fairness and reasonableness of the underwriting terms and arrangements.

(c) No Material Adverse Change. For the period from the date of this Agreement and to and including the First Closing Date and, with respect to the Optional Shares, each Option Closing Date, in the judgment of the Representative, there shall not have occurred any Material Adverse Change.

(d) Opinion of U.S. Counsel for the Company. On each of the First Closing Date and each Option Closing Date the Representative shall have received the opinion of Dorsey & Whitney LLP, U.S. counsel for the Company, dated as of such Closing Date, in form and substance satisfactory to counsel for the Underwriters (and the Representative shall have received an additional five signed copies of such counsel’s legal opinion for each of the several Underwriters).

(e) Opinion of Canadian Counsel for the Company. On each of the First Closing Date and each Option Closing Date the Representative shall have received the opinion of:

(i) Bennett Jones LLP, Canadian counsel for the Company;

(ii) Blake, Cassels & Graydon LLP, British Columbia counsel for the Company; and

(iii) McDougall Gauley LLP, Saskatchewan counsel for the Company;

(iv) Aikins, MacAulay & Thorvaldson LLP, Manitoba counsel for the Company;

(v) Stewart, McKelvey, Stirling & Scales, Atlantic counsel for the Company;

each dated as of such Closing Date, in form and substance satisfactory to counsel for the Underwriters (and the Representative shall have received an additional five signed copies of such counsel’s legal opinion for each of the several Underwriters).

(f) Opinion of U.S. Counsel for the Underwriters. On each of the First Closing Date and each Option Closing Date the Representative shall have received the opinion of Jones Day, U.S. counsel for the Underwriters, in form and substance satisfactory to the Underwriters, dated as of such Closing Date.

(g) Opinion of Canadian Counsel for the Underwriters. On each of the First Closing Date and each Option Closing Date the Representative shall have received the opinion of McCarthy Tétrault LLP, Canadian counsel for the Underwriters, in form and substance satisfactory to the Underwriters, dated as of such Closing Date.

(h) Officers’ Certificate. On each of the First Closing Date and each Option Closing Date the Representative shall have received a written certificate executed by the Chief Executive Officer or President of the Company and the Chief Financial Officer of the Company, dated as of such Closing Date, to the effect set forth in subsections (b)(ii)-(iv) and (c)(ii) of this Section 6, and further to the effect that:

(i) for the period from and including the date of this Agreement to and including such Closing Date, there has not occurred any Material Adverse Change;

(ii) the representations, warranties and covenants of the Company set forth in Section 1 of this Agreement are true and correct with the same force and effect as though expressly made on and as of such Closing Date; and

(iii) the Company has complied with all the agreements hereunder and satisfied all the conditions on its part to be performed or satisfied hereunder at or prior to such Closing Date.

(i) Bring-down Comfort Letter. On each of the First Closing Date and each Option Closing Date the Representative shall have received from KPMG LLP, independent public or certified public accountants for the Company, a letter dated such date, in form and substance satisfactory to the Representative, to the effect that they reaffirm the statements made in the letter furnished by them pursuant to subsection (a) of this Section 6, except that the specified date referred to therein for the carrying out of procedures shall be no more than three business days prior to the First Closing Date or the applicable Option Closing Date, as the case may be (and the Representative shall have received an additional five conformed copies of such accountants’ letter for each of the several Underwriters).

(j) Lock-Up Agreement from Certain Securityholders of the Company. On or prior to the date hereof, the Company shall have furnished to the Representative an agreement in the form of Exhibit B hereto from each of the persons listed on Exhibit A hereto, and such agreement shall be in full force and effect on each of the First Closing Date and each Option Closing Date.

(k) Additional Documents. On or before each of the First Closing Date and each Option Closing Date, the Representative and counsel for the Underwriters shall have received such information, documents and opinions as they may reasonably request for the purposes of enabling them to pass upon the issuance and sale of the Offered Shares as contemplated herein, or in order to evidence the accuracy of any of the representations and warranties, or the satisfaction of any of the conditions or agreements, herein contained; and all proceedings taken by the Company in connection with the issuance and sale of the Offered Shares as contemplated herein and in connection with the other transactions contemplated by this

Agreement shall be satisfactory in form and substance to the Representative and counsel for the Underwriters.

If any condition specified in this Section 6 is not satisfied when and as required to be satisfied, this Agreement may be terminated by the Representative by notice to the Company at any time on or prior to the First Closing Date and, with respect to the Optional Shares, at any time on or prior to the applicable Option Closing Date, which termination shall be without liability on the part of any party to any other party, except that Section 4, Section 6, Section 8 and Section 9 shall at all times be effective and shall survive such termination.

Section 7. Reimbursement of Underwriters’ Expenses. If this Agreement is terminated by the Representative pursuant to Section 6, Section 10 or Section 11, or if the sale to the Underwriters of the Offered Shares on the First Closing Date is not consummated because of any refusal, inability or failure on the part of the Company to perform any agreement herein or to comply with any provision hereof, the Company agrees to reimburse the Representative and the other Underwriters (or such Underwriters as have terminated this Agreement with respect to themselves), severally, upon demand for all out-of-pocket expenses that shall have been reasonably incurred by the Representative and the Underwriters in connection with the proposed purchase and the offering and sale of the Offered Shares, including but not limited to fees and disbursements of counsel, printing expenses, travel expenses, postage, facsimile and telephone charges.

Section 8. Indemnification.

(a) Indemnification of the Underwriters. The Company agrees to indemnify and hold harmless each Underwriter, its officers and employees and agents, and each person, if any, who controls any Underwriter within the meaning of the Securities Act or the Exchange Act against any loss, claim, damage, liability or expense, as incurred, to which such Underwriter or such officer, employee or controlling person may become subject, under the Securities Act, the Exchange Act, any Canadian Securities Laws, other federal, provincial or state statutory law or regulation, or the laws or regulations of foreign jurisdictions in which Offered Shares have been offered or sold, or at common law or otherwise (including in settlement of any litigation), insofar as such loss, claim, damage, liability or expense (or actions in respect thereof as contemplated below) arises out of or is based upon (i) any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement, or any amendment thereto, including any information deemed to be a part thereof for purposes of Section 11 under the Securities Act, or the omission or alleged omission therefrom of a material fact required to be stated therein or necessary to make the statements therein not misleading; (ii) any untrue statement or alleged untrue statement of a material fact contained in the Preliminary Prospectus, the Time of Sale Prospectus, any free writing prospectus that the Company has used, referred to or filed, or is required to file, pursuant to Rule 433(d) of the Securities Act, the Prospectus, the Canadian Prospectus or Supplementary Material (or any amendment or supplement thereto), or the omission or alleged omission therefrom of a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; or (iii) any act or failure to act or any alleged act or failure to act by any Underwriter in connection with, or relating in any manner to, the Offered Shares or the offering contemplated hereby, and which is included as part of or referred to in any loss, claim, damage, liability or action arising out of or based upon any matter covered by clause (i) or (ii) above, provided that the Company shall not be liable under this clause (iii) to the extent that a court of competent jurisdiction shall have

determined by a final judgment that such loss, claim, damage, liability or action resulted directly from any such acts or failures to act undertaken or omitted to be taken by such Underwriter through its bad faith or willful misconduct; and to reimburse each Underwriter and each such officer, employee and controlling person for any and all expenses (including the fees and disbursements of counsel chosen by Jefferies) as such expenses are reasonably incurred by such Underwriter or such officer, employee or controlling person in connection with investigating, defending, settling, compromising or paying any such loss, claim, damage, liability, expense or action; provided, however, that the foregoing indemnity agreement shall not apply to any loss, claim, damage, liability or expense to the extent, but only to the extent, arising out of or based upon any untrue statement or alleged untrue statement or omission or alleged omission made in reliance upon and in conformity with written information furnished to the Company by the Representative expressly for use in the Registration Statement, the Preliminary Prospectus, the Time of Sale Prospectus, any such free writing prospectus, the Prospectus, the Canadian Prospectus or Supplementary Material (or any amendment or supplement thereto), it being understood and agreed that the only such information furnished by the Representative to the Company consists of the information described in subsection (b) below. The indemnity agreement set forth in this Section 8(a) shall be in addition to any liabilities that the Company may otherwise have.

(b) Indemnification of the Company, its Directors and Officers. Each Underwriter agrees, severally and not jointly, to indemnify and hold harmless the Company, each of its directors, each of its officers who signed the Registration Statement and each person, if any, who controls the Company within the meaning of the Securities Act or the Exchange Act, against any loss, claim, damage, liability or expense, as incurred, to which the Company, or any such director, officer or controlling person may become subject, under the Securities Act, the Exchange Act, Any Canadian Securities Laws or other federal, provincial or state statutory law or regulation, or at common law or otherwise (including in settlement of any litigation, if such settlement is effected with the written consent of such Underwriter), insofar as such loss, claim, damage, liability or expense (or actions in respect thereof as contemplated below) arises out of or is based upon (i) any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement, or any amendment thereto, including any information deemed to be a part thereof for purposes of Section 11 under the Securities Act, or the omission or alleged omission therefrom of a material fact required to be stated therein or necessary to make the statements therein not misleading, or (ii) any untrue statement or alleged untrue statement of a material fact contained in the Preliminary Prospectus, the Time of Sale Prospectus, any free writing prospectus that the Company has used, referred to or filed, or is required to file, pursuant to Rule 433(d) of the Securities Act, the Prospectus, the Canadian Prospectus or Supplementary Material (or any amendment or supplement thereto), or the omission or alleged omission therefrom of a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading, in each case to the extent, but only to the extent, that such untrue statement or alleged untrue statement or omission or alleged omission was made in the Registration Statement, the Preliminary Prospectus, the Time of Sale Prospectus, such free writing prospectus that the Company has used, referred to or filed, or is required to file, pursuant to Rule 433(d) of the Securities Act, the Prospectus, the Canadian Prospectus or Supplementary Material (or such amendment or supplement thereto), in reliance upon and in conformity with written information furnished to the Company by the Representative expressly for use therein; and to reimburse the Company, or any such director, officer or controlling person for any and all expenses (including the fees and disbursements of counsel) as such expenses are reasonably incurred by such director, officer or controlling person in connection with investigating, defending, settling, compromising or paying any such loss,

claim, damage, liability, expense or action. The Company hereby acknowledges that the only information that the Representative and the Underwriters have furnished to the Company expressly for use in the Registration Statement, the Preliminary Prospectus, the Time of Sale Prospectus, any free writing prospectus that the Company has filed, or is required to file, pursuant to Rule 433(d) of the Securities Act, the Prospectus, the Canadian Prospectus or Supplementary Material (or any amendment or supplement thereto) are the statements set forth in the table in the first paragraph and as set forth in the first paragraph under the subheading “Commission and Expenses,” and the third paragraph under the subheading “Price Stabilization, Short Positions and Penalty Bids,” under the caption “Underwriting” in the Preliminary Prospectus. The indemnity agreement set forth in this Section 8(b) shall be in addition to any liabilities that each Underwriter may otherwise have.

(c) Notifications and Other Indemnification Procedures. Promptly after receipt by an indemnified party under this Section 8 of notice of the commencement of any action, such indemnified party will, if a claim in respect thereof is to be made against an indemnifying party under this Section 8, notify the indemnifying party in writing of the commencement thereof, but the omission so to notify the indemnifying party will not relieve it from any liability which it may have to any indemnified party for contribution or otherwise than under the indemnity agreement contained in this Section 8 or to the extent it is not prejudiced as a proximate result of such failure. In case any such action is brought against any indemnified party and such indemnified party seeks or intends to seek indemnity from an indemnifying party, the indemnifying party will be entitled to participate in, and, to the extent that it shall elect, jointly with all other indemnifying parties similarly notified, by written notice delivered to the indemnified party promptly after receiving the aforesaid notice from such indemnified party, to assume the defense thereof with counsel reasonably satisfactory to such indemnified party; provided, however, if the defendants in any such action include both the indemnified party and the indemnifying party and the indemnified party shall have reasonably concluded that a conflict may arise between the positions of the indemnifying party and the indemnified party in conducting the defense of any such action or that there may be legal defenses available to it and/or other indemnified parties which are different from or additional to those available to the indemnifying party, the indemnified party or parties shall have the right to select separate counsel to assume such legal defenses and to otherwise participate in the defense of such action on behalf of such indemnified party or parties. Upon receipt of notice from the indemnifying party to such indemnified party of such indemnifying party’s election so to assume the defense of such action and approval by the indemnified party of counsel, the indemnifying party will not be liable to such indemnified party under this Section 8 for any legal or other expenses subsequently incurred by such indemnified party in connection with the defense thereof unless (i) the indemnified party shall have employed separate counsel in accordance with the proviso to the preceding sentence (it being understood, however, that the indemnifying party shall not be liable for the fees and expenses of more than one separate counsel (together with local counsel) representing the indemnified parties who are parties to such action), which counsel (together with any local counsel) for the indemnified parties shall be selected by Jefferies (in the case of counsel for the indemnified parties referred to in Section 8(a) above) or by the Company (in the case of counsel for the indemnified parties referred to in Section 8(b) above)), (ii) the indemnifying party shall not have employed counsel satisfactory to the indemnified party to represent the indemnified party within a reasonable time after notice of commencement of the action or (iii) the indemnifying party has authorized in writing the employment of counsel for the indemnified party at the expense of the indemnifying party, in each of which cases the fees and expenses of counsel shall be at the expense of the indemnifying party and shall be paid as they are incurred.

(d) Settlements. The indemnifying party under this Section 8 shall not be liable for any settlement of any proceeding effected without its written consent, but if settled with such consent or if there be a final judgment for the plaintiff, the indemnifying party agrees to

indemnify the indemnified party against any loss, claim, damage, liability or expense by reason of such settlement or judgment. Notwithstanding the foregoing sentence, if at any time an indemnified party shall have requested an indemnifying party to reimburse the indemnified party for fees and expenses of counsel as contemplated by Section 8(c) hereof, the indemnifying party agrees that it shall be liable for any settlement of any proceeding effected without its written consent if (i) such settlement is entered into more than 30 days after receipt by such indemnifying party of the aforesaid request and (ii) such indemnifying party shall not have reimbursed the indemnified party in accordance with such request prior to the date of such settlement. No indemnifying party shall, without the prior written consent of the indemnified party, effect any settlement, compromise or consent to the entry of judgment in any pending or threatened action, suit or proceeding in respect of which any indemnified party is or could have been a party and indemnity was or could have been sought hereunder by such indemnified party, unless such settlement, compromise or consent includes an unconditional release of such indemnified party from all liability on claims that are the subject matter of such action, suit or proceeding.

Section 9. Contribution. If the indemnification provided for in Section 8 is for any reason held to be unavailable to or otherwise insufficient to hold harmless an indemnified party in respect of any losses, claims, damages, liabilities or expenses referred to therein, then each indemnifying party shall contribute to the aggregate amount paid or payable by such indemnified party, as incurred, as a result of any losses, claims, damages, liabilities or expenses referred to therein (i) in such proportion as is appropriate to reflect the relative benefits received by the Company, on the one hand, and the Underwriters, on the other hand, from the offering of the Offered Shares pursuant to this Agreement or (ii) if the allocation provided by clause (i) above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause (i) above but also the relative fault of the Company, on the one hand, and the Underwriters, on the other hand, in connection with the statements or omissions which resulted in such losses, claims, damages, liabilities or expenses, as well as any other relevant equitable considerations. The relative benefits received by the Company, on the one hand, and the Underwriters, on the other hand, in connection with the offering of the Offered Shares pursuant to this Agreement shall be deemed to be in the same respective proportions as the total net proceeds from the offering of the Offered Shares pursuant to this Agreement (before deducting expenses) received by the Company, and the total underwriting discounts and commissions received by the Underwriters, in each case as set forth on the front cover page of the Prospectus bear to the aggregate initial public offering price of the Offered Shares as set forth on such cover. The relative fault of the Company, on the one hand, and the Underwriters, on the other hand, shall be determined by reference to, among other things, whether any such untrue or alleged untrue statement of a material fact or omission or alleged omission to state a material fact relates to information supplied by the Company, on the one hand, or the Underwriters, on the other hand, and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission.

The amount paid or payable by a party as a result of the losses, claims, damages, liabilities and expenses referred to above shall be deemed to include, subject to the limitations set forth in Section 8(c), any legal or other fees or expenses reasonably incurred by such party in connection with investigating or defending any action or claim. The provisions set forth in Section 8(c) with respect to notice of commencement of any action shall apply if a claim for contribution is to be made under this Section 9; provided, however, that no additional notice shall be required with respect to any action for which notice has been given under Section 8(c) for purposes of indemnification.

The Company and the Underwriters agree that it would not be just and equitable if contribution pursuant to this Section 9 were determined by pro rata allocation (even if the Underwriters were treated as one entity for such purpose) or by any other method of allocation which does not take account of the equitable considerations referred to in this Section 9.

Notwithstanding the provisions of this Section 9, no Underwriter shall be required to contribute any amount in excess of the underwriting discounts and commissions received by such Underwriter in connection with the Offered Shares underwritten by it and distributed to the public. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The Underwriters’ obligations to contribute pursuant to this Section 9 are several, and not joint, in proportion to their respective underwriting commitments as set forth opposite their respective names on Schedule A. For purposes of this Section 9, each officer and employee of an Underwriter and each person, if any, who controls an Underwriter within the meaning of the Securities Act or the Exchange Act shall have the same rights to contribution as such Underwriter, and each director of the Company, each officer of the Company who signed the Registration Statement, and each person, if any, who controls the Company within the meaning of the Securities Act and the Exchange Act shall have the same rights to contribution as the Company.

Section 10. Default of One or More of the Several Underwriters. If, on the First Closing Date or the applicable Option Closing Date, as the case may be, any one or more of the several Underwriters shall fail or refuse to purchase Offered Shares that it or they have agreed to purchase hereunder on such date, and the aggregate number of Offered Shares which such defaulting Underwriter or Underwriters agreed but failed or refused to purchase does not exceed 10% of the aggregate number of the Offered Shares to be purchased on such date, the Representative may make arrangements satisfactory to the Company for the purchase of such Offered Shares by other persons, including any of the Underwriters, but if no such arrangements are made by such Closing Date, the other Underwriters shall be obligated, severally and not jointly, in the proportions that the number of Firm Shares set forth opposite their respective names on Schedule A bears to the aggregate number of Firm Shares set forth opposite the names of all such non-defaulting Underwriters, or in such other proportions as may be specified by the Representative with the consent of the non-defaulting Underwriters, to purchase the Offered Shares which such defaulting Underwriter or Underwriters agreed but failed or refused to purchase on such date. If, on the First Closing Date or the applicable Option Closing Date, as the case may be, any one or more of the Underwriters shall fail or refuse to purchase Offered Shares and the aggregate number of Offered Shares with respect to which such default occurs exceeds 10% of the aggregate number of Offered Shares to be purchased on such date, and arrangements satisfactory to the Representative and the Company for the purchase of such Offered Shares are not made within 48 hours after such default, this Agreement shall terminate without liability of any party to any other party except that the provisions of Section 4, Section 7, Section 8 and Section 9 shall at all times be effective and shall survive such termination. In any such case either the Representative or the Company shall have the right to postpone the First Closing Date or the applicable Option Closing Date, as the case may be, but in no event for longer than seven days in order that the required changes, if any, to the Registration Statement and the Prospectus or any other documents or arrangements may be effected.

As used in this Agreement, the term “Underwriter” shall be deemed to include any person substituted for a defaulting Underwriter under this Section 10. Any action taken under this Section 10 shall not relieve any defaulting Underwriter from liability in respect of any default of such Underwriter under this Agreement.

Section 11. Termination of this Agreement. Prior to the purchase of the Firm Shares by the Underwriters on the First Closing Date this Agreement may be terminated by the Representative by notice given to the Company if at any time (i) trading or quotation in any of the Company’s securities shall have been suspended or limited by the Commission, by the Nasdaq Global Market or by a Canadian securities regulatory authority or by the TSX, or trading in securities generally on any of the Nasdaq Stock Market, the New York Stock Exchange or the TSX shall have been suspended or limited, or minimum or maximum prices shall have been generally established on any of such stock exchanges by the Commission or FINRA; (ii) a general banking moratorium shall have been declared by any United States federal, New York state or Canadian federal authorities; (iii) there shall have occurred any outbreak or escalation of national or international hostilities or any crisis or calamity, or any change in the United States, Canadian or international financial markets, or any substantial change or development involving a prospective substantial change in United States’, Canada’s or international political, financial or economic conditions, in each case as in the judgment of the Representative is material and adverse and makes it impracticable to market the Offered Shares in the manner and on the terms described in the Time of Sale Prospectus or the Applicable Prospectus or to enforce contracts for the sale of securities; (iv) in the judgment of the Representative there shall have occurred any Material Adverse Change; or (v) the Company shall have sustained a loss by strike, fire, flood, earthquake, accident or other calamity of such character as in the judgment of the Representative may interfere materially with the conduct of the business and operations of the Company regardless of whether or not such loss shall have been insured. Any termination pursuant to this Section 11 shall be without liability on the part of (a) the Company to any Underwriter, except that the Company shall be obligated to reimburse the expenses of the Representative and the Underwriters pursuant to Sections 4 and 7 hereof, (b) any Underwriter to the Company, or (c) any party hereto to any other party, except that the provisions of Section 8 and Section 9 shall at all times be effective and shall survive such termination.

Section 12. No Advisory or Fiduciary Relationship. The Company acknowledges and agrees that (a) the purchase and sale of the Offered Shares pursuant to this Agreement, including the determination of the public offering price of the Offered Shares and any related discounts and commissions, is an arm’s-length commercial transaction between the Company, on the one hand, and the several Underwriters, on the other hand, (b) in connection with the offering contemplated hereby and the process leading to such transaction each Underwriter is and has been acting solely as a principal and is not the agent or fiduciary of the Company or its shareholders, creditors, employees or any other party, (c) no Underwriter has assumed or will assume an advisory or fiduciary responsibility in favor of the Company with respect to the offering contemplated hereby or the process leading thereto (irrespective of whether such Underwriter has advised or is currently advising the Company on other matters) and no Underwriter has any obligation to the Company with respect to the offering contemplated hereby except the obligations expressly set forth in this Agreement, (d) the Underwriters and their respective affiliates may be engaged in a broad range of transactions that involve interests that differ from those of the Company, and (e) the Underwriters have not provided any legal, accounting, regulatory or tax advice with respect to the offering contemplated hereby and the Company has consulted its own legal, accounting, regulatory and tax advisors to the extent it deemed appropriate.

Section 13. Representations and Indemnities to Survive Delivery. The respective indemnities, agreements, representations, warranties and other statements of the Company, of its officers and of the several Underwriters set forth in or made pursuant to this Agreement will remain in full force and effect, regardless of any investigation made by or on behalf of any Underwriter or the Company or any of its or their partners, officers or directors or any controlling person, as the case may be, and, anything herein to the contrary notwithstanding, will survive delivery of and payment for the Offered Shares sold hereunder and any termination of this Agreement.

Section 14. Notices. All communications hereunder shall be in writing and shall be mailed, hand delivered or telecopied and confirmed to the parties hereto as follows:

If to the Representative:
Jefferies & Company, Inc.
520 Madison Avenue
New York, New York 10022
Facsimile: (212) 284-2280
Attention: General Counsel

If to the Company:
Westport Innovations Inc.
1750 West 75th Avenue, Suite 101

Vancouver, BC, Canada V6P 6G2
Facsimile: (604) 718-2001
Attention: Chief Financial Officer

Any party hereto may change the address for receipt of communications by giving written notice to the others.

Section 15. Successors. This Agreement will inure to the benefit of and be binding upon the parties hereto, including any substitute Underwriters pursuant to Section 10 hereof, and to the benefit of the employees, officers and directors and controlling persons referred to in Section 8 and Section 9, and in each case their respective successors and personal representatives, and no other person will have any right or obligation hereunder. The term “successors” shall not include any purchaser of the Offered Shares as such from any of the Underwriters merely by reason of such purchase.

Section 16. Partial Unenforceability. The invalidity or unenforceability of any Section, paragraph or provision of this Agreement shall not affect the validity or enforceability of any other Section, paragraph or provision hereof. If any Section, paragraph or provision of this Agreement is for any reason determined to be invalid or unenforceable, there shall be deemed to be made such minor changes (and only such minor changes) as are necessary to make it valid and enforceable.

Section 17. Governing Law Provisions. This Agreement shall be governed by and construed in accordance with the internal laws of the State of New York applicable to agreements made and to be performed in such state. Any legal suit, action or proceeding arising out of or based upon this Agreement or the transactions contemplated hereby (“Related Proceedings”) may be instituted in the federal courts of the United States of America located in the Borough of Manhattan in the City of New York or the courts of the State of New York in each case located in the Borough of Manhattan in the City of New York

(collectively, the “Specified Courts”), and each party irrevocably submits to the exclusive jurisdiction (except for proceedings instituted in regard to the enforcement of a judgment of any such court (a “Related Judgment”), as to which such jurisdiction is non-exclusive) of such courts in any such suit, action or proceeding. Service of any process, summons, notice or document by mail to such party’s address set forth above shall be effective service of process for any suit, action or other proceeding brought in any such court. The parties irrevocably and unconditionally waive any objection to the laying of venue of any suit, action or other proceeding in the Specified Courts and irrevocably and unconditionally waive and agree not to plead or claim in any such court that any such suit, action or other proceeding brought in any such court has been brought in an inconvenient forum. Each party not located in the United States irrevocably appoints CT Corporation System, which currently maintains a New York City office at 111 8th Avenue, New York, New York, 10011, United States of America, as its agent to receive service of process or other legal summons for purposes of any such suit, action or proceeding that may be instituted in any state or federal court in the Borough of Manhattan in the City of New York.

With respect to any Related Proceeding, each party irrevocably waives, to the fullest extent permitted by applicable law, all immunity (whether on the basis of sovereignty or otherwise) from jurisdiction, service of process, attachment (both before and after judgment) and execution to which it might otherwise be entitled in the Specified Courts, and with respect to any Related Judgment, each party waives any such immunity in the Specified Courts or any other court of competent jurisdiction, and will not raise or claim or cause to be pleaded any such immunity at or in respect of any such Related Proceeding or Related Judgment, including, without limitation, any immunity pursuant to the United States Foreign Sovereign Immunities Act of 1976, as amended.

Section 18. General Provisions. This Agreement constitutes the entire agreement of the parties to this Agreement and supersedes all prior written or oral and all contemporaneous oral agreements, understandings and negotiations with respect to the subject matter hereof. This Agreement may be executed in two or more counterparts, each one of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument. This Agreement may not be amended or modified unless in writing by all of the parties hereto, and no condition herein (express or implied) may be waived unless waived in writing by each party whom the condition is meant to benefit. The Section headings herein are for the convenience of the parties only and shall not affect the construction or interpretation of this Agreement.

Each of the parties hereto acknowledges that it is a sophisticated business person who was adequately represented by counsel during negotiations regarding the provisions hereof, including, without limitation, the indemnification provisions of Section 8 and the contribution provisions of Section 9, and is fully informed regarding said provisions. Each of the parties hereto further acknowledges that the provisions of Sections 8 and 9 hereto fairly allocate the risks in light of the ability of the parties to investigate the Company, its affairs and its business in order to assure that adequate disclosure has been made in the Registration Statement, the Preliminary Prospectus, the Time of Sale Prospectus, each free writing prospectus, the Canadian Prospectus and the Prospectus (or any amendments and supplements thereto), as required by the Securities Act and the Exchange Act.

If the foregoing is in accordance with your understanding of our agreement, kindly sign and return to the Company the enclosed copies hereof, whereupon this instrument, along with all counterparts hereof, shall become a binding agreement in accordance with its terms.

	Very truly yours,

	WESTPORT INNOVATIONS INC.


	By:
		Name:
		Title:

The foregoing Underwriting Agreement is hereby confirmed and accepted by the Representative in New York, New York as of the date first above written.

JEFFERIES & COMPANY, INC.

Acting as Representative of the

several Underwriters named in

the attached Schedule A.

By:
	Name:
	Title:

Underwriting Agreement

SCHEDULE A

Underwriters	Number of Firm Shares to be Purchased
Jefferies & Company, Inc.	[	]
Lazard Capital Markets LLC	[	]
ThinkPanmure, LLC	[	]
Canaccord Adams Inc.	[	]
National Bank Financial Inc.	[	]

Total	4,500,000

SCHEDULE C

Subsidiaries and other Investments of the Company

Schedule C-1

Westport Innovations (Hong Kong) Ltd. - (Hong Kong, China)

Westport Innovations (Australia) Pty Ltd. - (Victoria, Australia)

Westport Power Inc. - (British Columbia, Canada)

Westport Fuel Systems Inc. - (Delaware, U.S.A.)

Westport Germany GmbH - (Germany)

Cummins Westport Inc. - (Delaware, U.S.A.)

Schedule C-2

Wesport Energy Inc. - (British Columbia, Canada)

BTIC Westport Inc. - (Beijing, China)

Juniper Engines Inc. - (British Columbia, Canada)

Cummins Westport (Canada) Inc. - (Ontaris, Canada)

Clean Energy Fuels Corp. - (Delaware, U.S.A.)