Exhibit 99.4

NORTH AMERICAN ENERGY PARTNERS INC.

CANADIAN SUPPLEMENT TO:

Annual Managements
Discussion and Analysis

For the year ended March 31, 2010

This document supplements the Managements Discussion and Analysis for the three months and year ended March 31, 2010 and has been prepared pursuant
to Section 5.2 of National Instrument 51-102- Continuous Disclosure Obligations



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Canadian Supplement to
Managements Discussion and Analysis

For the year ended March 31, 2010

Summary of differences between US GAAP and Canadian GAAP

June 10, 2010

The annual consolidated financial statements for the
three months and year ended March 31, 2010 and the accompanying annual Managements Discussion and Analysis (MD&A) have been prepared in accordance with US generally accepted accounting principles (GAAP). As required by the National
instrument 52-107, for the fiscal year of adoption of US GAAP and one subsequent fiscal year, we are required to provide a Canadian Supplement to our MD&A (Canadian Supplement) that states, based on financial information reconciled to
Canadian GAAP, those parts of our MD&A that would contain material differences if they were based on financial statements prepared in accordance with Canadian GAAP. The Canadian Supplement should be read in conjunction with our annual financial
statements and annual MD&A included in our annual report for the year ended March 31, 2010 prepared in accordance with US GAAP. Note 34 of our annual financial statements explains and quantifies the material differences between US GAAP
and Canadian GAAP on our financial position and results of operations.

The tables in this supplement highlight the differences between Canadian and US
GAAP. We have shown the Consolidated Statements of Operations, Comprehensive Income (Loss) and Deficit for the three months and year ended March 31, 2010 and an extract of the Consolidated Balance Sheets as at March 31, 2010, so that the
areas impacted by the GAAP differences can be clearly identified. Figures included in this supplement are in thousands of Canadian dollars, except per share information.



2Canadian Supplement to
Managements Discussion and AnalysisNorth American Energy Partners Inc.



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LOGO



Consolidated Statements of Operations,
Comprehensive Income (Loss) and Deficit



|                                                                            |  |                              |   |  |             |   |  |               |   |  |                               |   |  |             |   |  |                          |  
|--------------------------------------------------------------------------- |  | ---------------------------- | - |  | ----------- | - |  | ------------- | - |  | ----------------------------- | - |  | ----------- | - |  | ------------------------ | -
|                                                                            |  | Three months ended March 31, |  
|(dollars in thousands, except per shareinformation)                         |  | 2010(CanadianGAAP)           |   |  | Adjustments |   |  | 2010 (USGAAP) |   |  | 2009(Amended (j)CanadianGAAP) |   |  | Adjustments |   |  | 2009(Amended (j)US GAAP) |  
|Revenue (g)                                                                 |  | $222,374                     |   |  | $(1,805     | ) |  | $220,569      |   |  | $174,700                      |   |  | $          |   |  | $174,700                 |  
|Project costs (g)                                                           |  | 94,015                       |   |  | (1,614      | ) |  | 92,401        |   |  | 71,522                        |   |  |            |   |  | 71,522                   |  
|Equipment costs                                                             |  | 61,493                       |   |  |            |   |  | 61,493        |   |  | 48,374                        |   |  |            |   |  | 48,374                   |  
|Equipment operating lease expense                                           |  | 22,009                       |   |  |            |   |  | 22,009        |   |  | 13,266                        |   |  |            |   |  | 13,266                   |  
|Depreciation (a)                                                            |  | 11,912                       |   |  | 31          |   |  | 11,943        |   |  | 8,527                         |   |  | 69          |   |  | 8,596                    |  
|                                                                            |  |                              |   |  |             |   |  |               |   |  |                               |   |  |             |   |  |                          |  
|Gross profit                                                                |  | 32,945                       |   |  | (222        | ) |  | 32,723        |   |  | 33,011                        |   |  | (69         | ) |  | 32,942                   |  
|General and administrative costs (c) and (g)                                |  | 19,308                       |   |  | (204        | ) |  | 19,104        |   |  | 16,688                        |   |  | 12          |   |  | 16,700                   |  
|Loss on disposal of property, plant and equipment                           |  | 189                          |   |  |            |   |  | 189           |   |  | 1,547                         |   |  |            |   |  | 1,547                    |  
|Loss on disposal of assets held for sale                                    |  |                             |   |  |            |   |  |              |   |  |                              |   |  |            |   |  |                         |  
|Amortization of intangible assets (b)                                       |  | 489                          |   |  | (208        | ) |  | 281           |   |  | 662                           |   |  | (210        | ) |  | 452                      |  
|Equity in loss of unconsolidated joint venture (g)                          |  |                             |   |  | 22          |   |  | 22            |   |  |                              |   |  |            |   |  |                         |  
|Impairment of goodwill                                                      |  |                             |   |  |            |   |  |              |   |  | 143,447                       |   |  |            |   |  | 143,447                  |  
|                                                                            |  |                              |   |  |             |   |  |               |   |  |                               |   |  |             |   |  |                          |  
|Operating income (loss) before the undernoted                               |  | 12,959                       |   |  | 168         |   |  | 13,127        |   |  | (129,333                      | ) |  | 129         |   |  | (129,204                 | )
|Interest expense, net (b)                                                   |  | 5,709                        |   |  | 646         |   |  | 6,355         |   |  | 7,787                         |   |  | 549         |   |  | 8,336                    |  
|Foreign exchange (gain) loss (b)                                            |  | (5,925                       | ) |  | (46         | ) |  | (5,971        | ) |  | 7,567                         |   |  | 84          |   |  | 7,651                    |  
|Realized and unrealized loss (gain) on derivative financial instruments (d) |  | 13,946                       |   |  | (2,720      | ) |  | 11,226        |   |  | (11,424                       | ) |  |            |   |  | (11,424                  | )
|Other income                                                                |  | (818                         | ) |  |            |   |  | (818          | ) |  | (591                          | ) |  |            |   |  | (591                     | )
|                                                                            |  |                              |   |  |             |   |  |               |   |  |                               |   |  |             |   |  |                          |  
|Income (loss) before income taxes                                           |  | 47                           |   |  | 2,288       |   |  | 2,335         |   |  | (132,672                      | ) |  | (504        | ) |  | (133,176                 | )
|Current income taxes                                                        |  | 1,948                        |   |  |            |   |  | 1,948         |   |  | 3,704                         |   |  |            |   |  | 3,704                    |  
|Deferred income taxes (h)                                                   |  | 1,062                        |   |  | 268         |   |  | 1,330         |   |  | 371                           |   |  | (139        | ) |  | 232                      |  
|                                                                            |  |                              |   |  |             |   |  |               |   |  |                               |   |  |             |   |  |                          |  
|Net loss and comprehensive loss for the period                              |  | (2,963                       | ) |  | 2,020       |   |  | (943          | ) |  | (136,747                      | ) |  | (365        | ) |  | (137,112                 | )
|Deficit, beginning of the period                                            |  | (125,842                     | ) |  | (3,101      | ) |  | (128,943      | ) |  | (21,232                       | ) |  | 239         |   |  | (20,993                  | )
|                                                                            |  |                              |   |  |             |   |  |               |   |  |                               |   |  |             |   |  |                          |  
|Deficit, end of the period                                                  |  | $(128,805                    | ) |  | $(1,081     | ) |  | $(129,886     | ) |  | (157,979                      | ) |  | (126        | ) |  | (158,105                 | )
|                                                                            |  |                              |   |  |             |   |  |               |   |  |                               |   |  |             |   |  |                          |  
|Per share information                                                       |  |                              |   |  |             |   |  |               |   |  |                               |   |  |             |   |  |                          |  
|Net loss  basic                                                            |  | $(0.08                       | ) |  | $0.05       |   |  | $(0.03        | ) |  | $(3.79                        | ) |  | $(0.01      | ) |  | $(3.80                   | )
|                                                                            |  |                              |   |  |             |   |  |               |   |  |                               |   |  |             |   |  |                          |  
|Net loss  diluted                                                          |  | $(0.08                       | ) |  | $0.05       |   |  | $(0.03        | ) |  | $(3.79                        | ) |  | $(0.01      | ) |  | $(3.80                   | )
|                                                                            |  |                              |   |  |             |   |  |               |   |  |                               |   |  |             |   |  |                          |  
|EBITDA                                                                      |  | $18,157                      |   |  | $2,757      |   |  | $20,914       |   |  | $(115,696                     | ) |  | $(96        | ) |  | $(115,792                | )
|                                                                            |  |                              |   |  |             |   |  |               |   |  |                               |   |  |             |   |  |                          |  
|Consolidated EBITDA(as defined within our credit agreement) (i)             |  | $26,428                      |   |  | $          |   |  | $26,428       |   |  | $25,191                       |   |  | $          |   |  | $25,191                  |  
|                                                                            |  |                              |   |  |             |   |  |               |   |  |                               |   |  |             |   |  |                          |  



North American Energy Partners
Inc.Canadian Supplement to Managements Discussion and Analysis3



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|                                                                            |  |                      |  |             |  |               |  |                                 |  |             |  |                           
|--------------------------------------------------------------------------- |  | -------------------- |  | ----------- |  | ------------- |  | ------------------------------- |  | ----------- |  | --------------------------
|                                                                            |  | Year ended March 31,
|(dollars in thousands, except per
share information)                        |  | 2010(CanadianGAAP)   |  | Adjustments |  | 2010 (USGAAP) |  | 2009(CanadianGAAP Amended (j)) |  | Adjustments |  | 2009 (USGAAP Amended (j))
|Revenue (g)                                                                 |  | $763,301             |  | (4,336)     |  | 758,965       |  | 972,536                         |  | $          |  | 972,536                   
|Project costs (g)                                                           |  | 304,849              |  | (3,542)     |  | 301,307       |  | 505,026                         |  |            |  | 505,026                   
|Equipment costs                                                             |  | 209,408              |  |            |  | 209,408       |  | 217,120                         |  |            |  | 217,120                   
|Equipment operating lease expense                                           |  | 66,329               |  |            |  | 66,329        |  | 43,583                          |  |            |  | 43,583                    
|Depreciation (a)                                                            |  | 42,512               |  | 124         |  | 42,436        |  | 36,227                          |  | 162         |  | 36,389                    
|                                                                            |  |                      |  |             |  |               |  |                                 |  |             |  |                           
|Gross profit                                                                |  | 140,203              |  | (918)       |  | 139,285       |  | 170,580                         |  | (162)       |  | 170,418                   
|General and administrative costs (c) and (g)                                |  | 63,236               |  | (706)       |  | 62,530        |  | 74,405                          |  | 55          |  | 74,460                    
|Loss on disposal of property, plant and equipment                           |  | 1,233                |  |            |  | 1,233         |  | 5,325                           |  |            |  | 5,325                     
|Loss on disposal of assets held for sale                                    |  | 373                  |  |            |  | 373           |  | 24                              |  |            |  | 24                        
|Amortization of intangible assets (b)                                       |  | 2,550                |  | (831)       |  | 1,719         |  | 2,338                           |  | (837)       |  | 1,501                     
|Equity in earnings of unconsolidated joint venture (g)                      |  |                     |  | (44)        |  | (44)          |  |                                |  |            |  |                          
|Impairment of goodwill                                                      |  |                     |  |            |  |              |  | 176,200                         |  |            |  | 176,200                   
|                                                                            |  |                      |  |             |  |               |  |                                 |  |             |  |                           
|Operating income (loss) before the undernoted                               |  | 72,811               |  | 663         |  | 73,474        |  | (87,712)                        |  | 620         |  | (87,092)                  
|Interest expense, net (b)                                                   |  | 23,594               |  | 2,486       |  | 26,080        |  | 27,450                          |  | 2,162       |  | 29,612                    
|Foreign exchange (gain) loss (b)                                            |  | (48,405)             |  | (496)       |  | (48,901)      |  | 46,666                          |  | 606         |  | 47,272                    
|Realized and unrealized loss (gain) on derivative financial instruments (d) |  | 54,411               |  |            |  | 54,411        |  | (32,595)                        |  | (4,655)     |  | (37,250)                  
|Other income                                                                |  | (14)                 |  |            |  | (14)          |  | (5,955)                         |  |            |  | (5,955)                   
|                                                                            |  |                      |  |             |  |               |  |                                 |  |             |  |                           
|Income (loss) before income taxes                                           |  | 43,225               |  | (1,327)     |  | 41,898        |  | (123,278)                       |  | 2,507       |  | (120,771)                 
|Current income taxes                                                        |  | 3,803                |  |            |  | 3,803         |  | 5,546                           |  |            |  | 5,546                     
|Deferred income taxes (h)                                                   |  | 10,248               |  | (372)       |  | 9,876         |  | 9,053                           |  | 34          |  | 9,087                     
|                                                                            |  |                      |  |             |  |               |  |                                 |  |             |  |                           
|Net income (loss) and comprehensive income (loss) for the period            |  | 29,174               |  | (955)       |  | 28,219        |  | (137,877)                       |  | 2,473       |  | (135,404)                 
|Deficit, beginning of the period                                            |  | (157,979)            |  | (126)       |  | (158,105)     |  | (21,093)                        |  | (1,608)     |  | (22,701)                  
|Change in accounting policies related to inventories (f)                    |  |                     |  |            |  |              |  | 991                             |  | (991)       |  |                          
|                                                                            |  |                      |  |             |  |               |  |                                 |  |             |  |                           
|Deficit, end of the period                                                  |  | $(128,805)           |  | $(1,081)    |  | $(129,886)    |  | (157,979)                       |  | (126)       |  | (158,105)                 
|                                                                            |  |                      |  |             |  |               |  |                                 |  |             |  |                           
|Per share information                                                       |  |                      |  |             |  |               |  |                                 |  |             |  |                           
|Net income (loss)  basic                                                   |  | $0.81                |  | $(0.03)     |  | $0.78         |  | (3.83)                          |  | 0.07        |  | (3.76)                    
|                                                                            |  |                      |  |             |  |               |  |                                 |  |             |  |                           
|Net income (loss)  diluted                                                 |  | $0.79                |  | $(0.02)     |  | $0.77         |  | (3.83)                          |  | $0.07       |  | (3.76)                    
|                                                                            |  |                      |  |             |  |               |  |                                 |  |             |  |                           
|EBITDA                                                                      |  | 111,881              |  | $452        |  | 112,333       |  | $(49,275)                       |  | 3,994       |  | $(53,269)                 
|                                                                            |  |                      |  |             |  |               |  |                                 |  |             |  |                           
|Consolidated EBITDA(as defined within our credit agreement) (i)             |  | $121,644             |  | $          |  | $121,644      |  | $139,446                        |  | $          |  | $139,446                  
|                                                                            |  |                      |  |             |  |               |  |                                 |  |             |  |                           



4Canadian Supplement to
Managements Discussion and AnalysisNorth American Energy Partners Inc.



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LOGO



Extract of the Annual Consolidated
Balance Sheets

The following table highlights the differences between Canadian and US GAAP on the Annual Consolidated Balance Sheets. We have
focused on the line items that have been impacted by the GAAP differences.



|                                                              |  |                             |  |             |  |                        |  |                                         |  |             |  |                                   
|------------------------------------------------------------- |  | --------------------------- |  | ----------- |  | ---------------------- |  | --------------------------------------- |  | ----------- |  | ----------------------------------
|(dollars in thousands, except per shareinformation)           |  | March 31,2010(CanadianGAAP) |  | Adjustments |  | March 31,2010(US GAAP) |  | March 31,2009(CanadianGAAP
-Amended(j)) |  | Adjustments |  | March 31,2009(US GAAP
-Amended(j))
|Cash and cash
equivalents(g)                                  |  | $104,245                    |  | $(1,240)    |  | $103,005               |  | $98,880                                 |  | $          |  | $98,880                           
|Accounts receivable,
net(g)                                   |  | 113,316                     |  | (1,432)     |  | 111,884                |  | 78,323                                  |  |            |  | 78,323                            
|Unbilled
revenue(g)                                           |  | 86,496                      |  | (1,794)     |  | 84,702                 |  | 55,907                                  |  |            |  | 55,907                            
|Prepaid expenses and
deposits(g)                              |  | 6,968                       |  | (87)        |  | 6,881                  |  | 4,781                                   |  |            |  | 4,781                             
|Property, plant and
equipment(a)                              |  | 328,207                     |  | 536         |  | 328,743                |  | 315,455                                 |  | 660         |  | 316,115                           
|Intangible
assets(b)                                          |  | 8,720                       |  | (1,051)     |  | 7,669                  |  | 6,711                                   |  | (767)       |  | 5,944                             
|Deferred financing
costs(b)                                   |  | 1,040                       |  | 5,685       |  | 6,725                  |  |                                        |  | 7,910       |  | 7,910                             
|Investment in and advances to unconsolidated joint
venture(g) |  |                            |  | 2,917       |  | 2,917                  |  |                                        |  |            |  |                                  
|Accounts
payable(g)                                           |  | (68,513)                    |  | 1,637       |  | (66,876)               |  | (56,204)                                |  |            |  | (56,204)                          
|Senior notes(b)and(d)                                         |  | (201,614)                   |  | (1,506)     |  | (203,120)              |  | (252,899)                               |  | (2,857)     |  | (255,756)                         
|Deferred tax
liabilities(h)                                   |  | (26,389)                    |  | (1,052)     |  | (27,441)               |  | (29,322)                                |  | (1,423)     |  | (30,745)                          
|Common shares(e)                                              |  | (300,047)                   |  | (3,458)     |  | (303,505)              |  | (299,973)                               |  | (3,458)     |  | (303,431)                         
|Additional paid-in
capital(c)and(h)                           |  | (7,203)                     |  | (236)       |  | (7,439)                |  | (5,275)                                 |  | (191)       |  | (5,466)                           
|Deficit(a)(d)and(f)(h)                                      |  | 128,805                     |  | 1,081       |  | 129,886                |  | 157,979                                 |  | 126         |  | 158,105                           

Canadian and United States accounting policies
differences

A detailed reconciliation of our results for the years ended March 31, 2010, 2009 and 2008 is included in note 34 of our
consolidated financial statements for the years ended March 31, 2010, 2009 and 2008.

The differences between US GAAP and Canadian GAAP that
have the most significant impact on our financial position and results of operations for the three months and year ended March 31, 2010, include accounting for: capitalization of interest, financing costs, discounts and premiums, derivative
financial instruments, stock-based compensation, and modification of Series B Preferred Shares.

a) Capitalization of interest

US GAAP requires capitalization of interest costs as part of the historical cost of acquiring certain qualifying assets that require a period of time to
prepare for their intended use. This is not required under Canadian GAAP. The capitalized amount is subject to depreciation in accordance with our policies when the asset is placed into service.

b) Financing costs, discounts and premiums

Under
US GAAP, deferred financing costs incurred in connection with our senior notes are being amortized over the term of the related debt using the effective interest method. Prior to April 1, 2007, for Canadian GAAP purposes, these transaction
costs were recorded as a deferred asset under Canadian GAAP and these deferred financing costs were being amortized on a straight-line basis over the term of the debt.

Effective April 1, 2007, we adopted CICA Handbook Section 3855, Financial Instruments  Recognition and Measurement, on a retrospective
basis without restatement as described below. Although Section 3855 also requires the use of the effective interest method to account for the amortization of finance costs, the requirement to bifurcate the issuers early prepayment option
on issuance of the debt (which is not required under US GAAP) resulted in an additional premium that is being amortized over the term of the debt under Canadian GAAP. In addition, foreign denominated transaction costs, discounts and premiums are
considered as part of the carrying value of the related financial liability under Canadian GAAP and are subject to foreign currency gains or losses resulting from periodic translation procedures as they are treated as a monetary item under Canadian
GAAP. Under US GAAP, foreign denominated transaction costs are considered non-monetary and are not subject to foreign currency gains and losses resulting from periodic translation procedures.

In connection with the adoption of Section 3855, transaction costs incurred in connection with our Revolving Facility of $1,622 were reclassified from deferred
financing costs to intangible assets on April 1, 2007 under Canadian GAAP and these costs continue to be amortized on a straight-line basis over the term of the facility. Under US GAAP, we continue to amortize these transaction costs over
the stated term of the related debt using the effective interest method. We disclose the financing costs for both the senior notes and the Revolving Facility as deferred financing costs on the Consolidated Balance Sheets with the amortization charge
classified as interest on the Consolidated Statements of



North American Energy Partners
Inc.Canadian Supplement to Managements Discussion and Analysis5



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Operations and Comprehensive Income (Loss). Under Canadian GAAP, the financing costs related to the senior notes are included in the senior notes balance on the Consolidated Balance
Sheets.

c) Stock-based compensation

Up until
April 1, 2006, we followed the provisions of ASC 718, Share-Based Payment (formerly Statement of Financial Accounting Standards No. 123, Stock-Based Compensation), for US GAAP purposes. As we use the fair value
method of accounting for all stock-based compensation payments under Canadian GAAP, there were no differences between Canadian and US GAAP prior to April 1, 2006. On April 1, 2006, we adopted the provisions of Statement of Financial
Accounting Standards No. 123(R), Share-Based Payment (SFAS 123R), which is now a part of ASC 718. As we used the minimum value method for purposes of complying with Statement of Financial Accounting Standards
No. 123, we were required to adopt the provisions under the revised guidance prospectively. Under Canadian GAAP, we were permitted to exclude volatility from the determination of the fair value of stock options granted until the filing of our
initial registration statement relating to our initial public offering of voting shares on July 21, 2006. As a result, for options issued between April 1, 2006 and July 21, 2006, there is a difference between Canadian and US GAAP
relating to the determination of the fair value of options granted.

d) Derivative financial instruments

Under Canadian GAAP, we determined that the issuers early prepayment option included in the senior notes should be bifurcated from the host contract, along
with a contingent embedded derivative in the senior notes that provide for accelerated redemption by the holders in certain instances. These embedded derivatives were measured at fair value at the inception of the senior notes and the residual
amount of the proceeds was allocated to the debt. Changes in fair value of the embedded derivatives are recognized in net income and the carrying amount of the senior notes is accreted to par value over the term of the notes using the effective
interest method and is recognized as interest expense as discussed in b) above. Prior to April 1, 2007 under Canadian GAAP, separate accounting of embedded derivatives from the host contract was not permitted by EIC-117.

Under US GAAP, ASC 815 (formerly Statement of Financial Accounting Standard No. 133, Accounting for Derivative Instruments and Hedging Activities
(SFAS 133)) establishes accounting and reporting standards requiring that every derivative instrument (including certain derivative instruments embedded in other contracts and debt instruments) be recorded in the balance sheet as either
an asset or liability measured at its fair value. The contingent embedded derivative in the senior notes that provide for accelerated redemption by the holders in certain instances met the criteria for bifurcation from the debt contract and separate
measurement at fair value. The embedded derivative has been measured at fair value and changes in fair value recorded in net income for all periods presented. The issuers early prepayment option included in the senior notes does not meet the
criteria as an embedded derivative under ASC 815 (formerly SFAS 133) and was not bifurcated from the host contract and measured at fair value resulting in a US GAAP and Canadian GAAP difference.

On adoption of CICA Handbook Section 3855, Financial Instruments  Recognition and Measurement, we reviewed the accounting treatment of a
number of outstanding contracts and determined that a price escalation feature in a revenue construction contract and supplier contracts entered into prior to April 1, 2007 contained embedded derivatives that are not closely related to the host
contract under Canadian GAAP. We recorded the fair value of these embedded derivatives on April 1, 2007 of $9.7 million, with a corresponding increase in opening deficit of $7.0 million, net of future income taxes of $2.8 million for Canadian
GAAP purposes. Under US GAAP, we had recognized and measured these embedded derivatives since inception of the related contracts.

e) NAEPI
Series B Preferred Shares

Prior to the modification of the terms of the North American Energy Partners Inc. (NAEPI) Series B preferred
shares on March 30, 2006, there were no differences between Canadian GAAP and US GAAP related to the NAEPI Series B preferred shares. As a result of the modification of terms of NAEPIs Series B preferred shares, under Canadian GAAP,
NACG continued to classify the NAEPI Series B preferred shares as a liability and was accreting the carrying amount of $42.2 million on the amendment date (March 30, 2006) to their December 31, 2011 redemption value of $69.6 million using the
effective interest method. Under US GAAP, NACG recognized the fair value of the amended NAEPI Series B preferred shares as minority interest as such amount was recognized as temporary equity in the accounts of NAEPI in accordance with EITF
Topic D-98 and recognized a charge of $3.7 million to retained earnings for the difference between the fair value and the carrying amount of the Series B preferred shares on the amendment date. Under US GAAP, NACG was accreting the initial fair
value of the amended NAEPI Series B preferred shares of $45.9 million recorded on their amendment date (March 30, 2006) to the December 31, 2011 redemption value of $69.6 million using the effective interest method, which was consistent with
the treatment of the NAEPI Series B preferred shares as temporary equity in the financial statements of NAEPI. The accretion charge was recognized by NACG as a charge to minority interest (as opposed to retained earnings in the accounts of NAEPI)
under US GAAP and interest expense in NACGs financial statements under Canadian GAAP.

On November 28, 2006, NACG exercised a call option
to acquire all of the issued and outstanding NAEPI Series B preferred shares in exchange for 7,524,400 common shares of NACG. For Canadian GAAP purposes, NACG recorded the exchange by transferring the carrying value of the NAEPI Series B preferred
shares on the exercise date of $44.7 million to common



6Canadian Supplement to
Managements Discussion and AnalysisNorth American Energy Partners Inc.



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shares. For US GAAP purposes, the conversion has been accounted for as a combination of entities under common control as all of the shareholders of the NAEPI Series B preferred shares are
also common shareholders of NACG resulting in the reclassification of the carrying value of the minority interest on the exercise date of $48.1 million to common shares. NACG and NAEPI were amalgamated later in 2006 and the amalgamated entity
continued as NAEPI.

f) Inventories

Effective
April 1, 2008, we retrospectively adopted CICA Handbook Section 3031, Inventories, without restatement of prior periods. This standard requires inventories to be measured at the lower of cost and net realizable value and
provides guidance on the determination of cost, including the allocation of overheads and other costs to inventories, the requirement for an entity to use a consistent cost formula for inventory of a similar nature and use, and the reversal of
previous write-downs to net realizable value when there are subsequent increases in the value of inventories. This new standard also clarifies that spare component parts that do not qualify for recognition as property, plant and equipment should be
classified as inventory. In adopting this new standard, we reversed a tire impairment that was previously recorded at March 31, 2008 in other assets of $1.4 million with a corresponding decrease to opening deficit of $1.0 million net of
future taxes of $0.4 million.

During the year ended March 31, 2008, the replacement cost (i.e. market) of spare tire inventory was lower than the
original carrying amount of inventory. As a result, we recorded an inventory write-down of $1.4 million under Canadian GAAP. Under US GAAP, market means current replacement cost. However, market under US GAAP should not exceed the net
realizable value nor should it be less than net realizable value reduced by an allowance for a normal profit margin. We established that the net realizable value and net realizable value less an allowance for a normal profit margin was greater than
or equal to cost and as such a write-down of spare tires was not appropriate under US GAAP for the year ended March 31, 2008. Please refer to note 3 aa) of our annual consolidated financial statements for the year ended March 31,
2010.

g) Joint venture

We own a 49% interest in
Noramac Ventures Inc., a nominee company for our Noramac Joint Venture (JV) and we have joint 50/50 control of this entity. Under US GAAP, we record our share of earnings (loss) of the JV using the equity method of accounting. Under Canadian
GAAP, we use the proportionate consolidation method of accounting for the JV. Under the proportionate consolidation method, we recognize our share of the results of operations, cash flows, and financial position of the JV on a line-by-line basis in
our consolidated financial statements and eliminate our share of all material intercompany transactions with the JV. While there is no impact on net income or earnings per share as a result of the US GAAP treatment of the joint venture, as
compared to Canadian GAAP, there are presentation differences affecting the disclosures in the consolidated financial statements and supporting notes.

h) Other matters

Other adjustments relate to the tax effect
of items (a) through (f) above. The tax effects of temporary differences are described as future income taxes under Canadian GAAP whereas in our US GAAP financial statements such amounts are described as deferred income taxes. In
addition, Canadian GAAP generally refers to additional paid-in capital as contributed surplus for financial statement presentation purposes.

i)
Consolidated EBITDA

A difference arises in computing EBITDA for the three months and year ended March 31, 2010 and March 31, 2009
respectively as result of US GAAP and Canadian GAAP differences stated above (a) to (d) and (f). Under US GAAP, equity in earnings (loss) of unconsolidated joint venture is added back in computing consolidated EBITDA for the
three months and years ended March 31, 2010 and March 31, 2009 respectively.

j) Adjustments related to prior year financial statements

The financial statements for fiscal 2009 and fiscal 2008 under Canadian GAAP have been amended to correct the following errors identified during the
preparation of our fiscal 2010 financial statements:



|i. | Reclassification of accrued liabilities. The financial statements for fiscal 2009 have been amended to correct a classification error with respect to accrued liabilities
identified during the preparation of our fiscal 2010 consolidated financial statements. Certain operating lease agreements provide a maximum hourly usage limit, above which we will be required to pay for the over hour usage. These contingent
rentals are recognized when payment is considered probable and are due at the end of the lease term. We have historically classified the contingent rentals as a current liability; however, certain of the amounts are due beyond one year from the
balance sheet date. In the current year, we reclassified amounts due beyond one year, from the balance sheet date, as a long term liability and has reclassified comparative figures accordingly. The amount reclassified on the Consolidated
Balance Sheet was $7.1 million as at March 31, 2009;
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|ii. | Buy-out of leased assets. The financial statements for fiscal 2008 have been amended under Canadian GAAP to correct an error related to the method of accounting
for an incentive at the time of buying previously leased assets, which was identified during the preparation of our fiscal 2010 consolidated financial statements. When an asset is leased under an operating lease agreement, as stated in the paragraph
above, contingent rentals are recognized when payment is considered probable and are due at the end of the lease term. We can buy the asset at the end
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North American Energy Partners
Inc.Canadian Supplement to Managements Discussion and Analysis7



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| | of the lease term at a pre-determined market price at which point the liability is extinguished since the lease agreement is cancelled. We have been traditionally extinguishing the liability for
such lease buyouts by reducing equipment costs related to leased equipment, instead of considering the extinguishment of the liability as an incentive to purchase the asset and therefore reducing the cost of the asset. The correction of this error
increased Equipment costs by $2.7 million, reduced Depreciation by $0.1 million, reduced Future income taxes by $0.8 million and reduced Net income and comprehensive income for the year by $1.8 million
from the amounts originally reported in the Consolidated Statements of Operations and Comprehensive Income (Loss) for the year ended March 31, 2008. It also reduced Property, plant and equipment by $2.6 million, reduced long term
future income taxes liabilities by $0.8 million and increased Deficit for the year by $1.8 million from the amounts originally reported in the Consolidated Balance Sheet as at March 31, 2008. The financial statements for fiscal 2009
have also been amended under Canadian GAAP to correct an error related to the method of accounting for an incentive at time of buying previously leased assets, which was identified during the preparation of our fiscal 2010 consolidated financial
statements as stated above. The correction of this error increased Equipment costs by $6.6 million, reduced Depreciation by $0.6 million, reduced Future income taxes by $1.8 million and increased Net loss
and comprehensive loss for the year by $4.2 million from the amounts originally reported in the Consolidated Statements of Operations and Comprehensive Income (Loss) for the year ended March 31, 2009. It also reduced Property, plant
and equipment by $8.6 million, reduced long term future income taxes liabilities by $2.6 million and increased Deficit for the year by $6.0 million from the amounts originally reported in the Consolidated Balance Sheet as at
March 31, 2009.
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|iii. | Valuation of derivative financial instruments. The financial statements for fiscal 2009 have also been amended under Canadian GAAP to correct an error related to the
determination of the fair value of the cross-currency and interest rate swap liabilities (collectively, the swap liability) which was identified on settlement of the swap liability on April 8, 2010. We recorded the fair value of the
swap liability and in addition recorded accrued interest on the swap liability. This resulted in the swap liability being misstated and the changes in the fair value of the swap liability being misstated by the change in the amount of the accrued
interest at each reporting period from March 31, 2009. The periods before March 31, 2009 were not materially impacted because prior to February 2, 2009, the Canadian Dollar interest rate swap was still in place (see Interest
rate risk in Quantitative and Qualitative Disclosures about Market Risk section in our annual MD&A) and therefore the net accrued interest payable under the swap liability was not material. The error increased Realized and unrealized
gain on derivative financial instruments by $7.5 million, increased income tax expense by $1.7 million and reduced net loss by $5.8 million from amounts originally reported in the Consolidated Statements of Operations and Comprehensive Income
(Loss) for the year ended March 31, 2009. It also reduced Derivative financial instruments by $7.5 million, increased long term future income taxes liabilities by $1.7 million and reduced Deficit by $5.8 million in the
Consolidated Balance Sheet as at March 31, 2009.
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Managements discussion and analysis under US GAAP

Please refer to the annual report for March 31, 2010 for our corresponding Managements Discussion and Analysis (MD&A) under US GAAP. The differences
between US GAAP and Canadian GAAP, described above, impact the discussion and analysis several sections of our annual MD&A.

Additional
information

Additional information relating to us, including our Annual Information Form dated June 10, 2010, can be found on the Canadian
Securities Administrators System for Electronic Document Analysis and Retrieval (SEDAR) database at www.sedar.com and the Securities and Exchange Commissions website at www.sec.gov.



8Canadian Supplement to
Managements Discussion and AnalysisNorth American Energy Partners Inc.