Suncor Energy 6K Report to Shareholders for the Third Quarter of 2017 | SU 26 Oct 17

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EXHIBIT 99.1

Report to Shareholders for the third quarter ended September 30, 2017

REPORT TO SHAREHOLDERS FOR THE THIRD QUARTER OF 2017

All financial figures are unaudited and presented in Canadian dollars unless noted otherwise. Production volumes are presented on a working-interest basis, before royalties, except for Libya, which is on an entitlement basis. Certain financial measures in this document are not prescribed by Canadian generally accepted accounting principles (GAAP). For a description of these non-GAAP financial measures, see the Non-GAAP Financial Measures Advisory section of Suncor's Management's Discussion and Analysis, dated October 25, 2017 (the MD&A). See also the Advisories section of the MD&A. References to Oil Sands operations exclude Suncor's interest in Syncrude's operations.

"Suncor generated $2.5 billion in cash flow during the third quarter as a result of strong companywide operating performance," said Steve Williams, president and chief executive officer. "We achieved record production at Oil Sands and our refineries ran at full capacity, allowing us to take advantage of a favourable downstream business environment and increasing demand for crude and refined products."

•: Funds from operations⁽¹⁾ of $2.472 billion ($1.49 per common share). Cash flow provided by operating activities, which includes changes in non-cash working capital, was $2.912 billion ($1.75 per common share).
•: Operating earnings⁽¹⁾ of $867 million ($0.52 per common share) and net earnings of $1.289 billion ($0.78 per common share).
•: Upstream achieved a new quarterly production record of 739,900 barrels of oil equivalent per day (boe/d), due primarily to increased production at Oil Sands operations, where upgrader and Firebag utilization exceeded 90%.
•: Syncrude achieved production of 159,100 barrels per day (bbls/d) in the third quarter of 2017 and ended the quarter at approximately 100% utilization following facility repairs from the incident in the first quarter of 2017 and planned maintenance.
•: Oil Sands operations cash operating costs per barrel⁽¹⁾ (bbl) were $21.60 for the third quarter of 2017, the lowest in over a decade.
•: Reliable operations in Refining and Marketing (R&M) drove refinery utilization above 100% and record quarterly crude throughput of 466,800 bbls/d, allowing the company to take advantage of a favourable business environment and achieve record retail and wholesale sales volumes in Canada.
•: The Fort Hills project was approximately 95% complete, with an initial test run of the front end of the plant completed and first bitumen froth successfully produced. The project remains on track for expected first oil at the end of 2017.
•: At Hebron, drilling commenced in the third quarter of 2017 and first oil remains on track for the end of 2017.

(1): Non-GAAP financial measures. See page 4 for a reconciliation of net earnings (loss) to operating earnings (loss). See the Non-GAAP Financial Measures Advisory section of the MD&A.

Financial Results

Suncor recorded third quarter 2017 operating earnings⁽¹⁾ of $867 million ($0.52 per common share) compared to $346 million ($0.21 per common share) in the prior year quarter. Highlights of the quarter included improved benchmark crack spreads and crude oil pricing, record refinery throughput and retail and wholesale sales volumes in Canada, record Oil Sands operations production, despite planned maintenance, lower exploration expense, as the prior year quarter included a charge for a non-commercial well off the east coast of Canada, and a continued focus on cost reduction. These items more than offset the impact of unfavourable foreign exchange rates in the period.

Funds from operations⁽¹⁾ were $2.472 billion ($1.49 per common share) compared to $2.025 billion ($1.22 per common share) in the third quarter of 2016 and were influenced by the same factors impacting operating earnings noted above, excluding the charge for a non-commercial well off the east coast of Canada, and also included the impact of favourable current tax recoveries and reassessments from prior periods.

Net earnings were $1.289 billion ($0.78 per common share) in the third quarter of 2017, compared to $392 million ($0.24 per common share) in the prior year quarter. Net earnings for the third quarter of 2017 included an unrealized after-tax foreign exchange gain of $412 million on the revaluation of U.S. dollar denominated debt and a non-cash after-tax gain of $10 million on forward interest rate swaps. Net earnings in the prior year quarter included a $180 million deferred tax recovery related to a tax rate reduction on oil and gas profits in the United Kingdom (U.K.) from 50% to 40%, an unrealized after-tax foreign exchange loss of $112 million on the revaluation of U.S. dollar denominated debt and a non-cash after-tax mark to market loss of $22 million on interest rate swaps.

Operating Results

Suncor's total upstream production set a new quarterly record of 739,900 boe/d in the third quarter of 2017, compared to 728,100 boe/d in the prior year quarter.

Oil Sands operations production was 469,300 bbls/d in the third quarter of 2017, compared to 433,700 bbls/d in the prior year quarter, with the increase primarily due to improved upgrader reliability and higher Firebag production following a successful return to service after the completion of the first five-year turnaround cycle of the expanded central facility. Both periods included planned upgrader maintenance, with the third quarter of 2016 also being impacted by unplanned upgrader maintenance.

Oil Sands operations cash operating costs per barrel⁽¹⁾ were $21.60 in the third quarter of 2017, down from $22.15 in the prior year quarter as a result of improved asset utilization, partially offset by higher planned maintenance expense and increased costs associated with improved production.

Suncor's share of Syncrude production was 159,100 bbls/d in the third quarter of 2017, compared to 183,800 bbls/d in the prior year quarter. The decrease was attributed to the outage associated with the facility incident from the first quarter of 2017 and planned coker maintenance, which both impacted the early part of the quarter. Coker maintenance completed in the period was originally scheduled for the fourth quarter of 2017 and was advanced to coincide with the unplanned outage from earlier in the year to mitigate the impact on annual production. Following the facility repairs from the incident and the completion of planned maintenance early in the quarter, Syncrude's upgrader utilization was approximately 100%. Syncrude cash operating costs per barrel⁽¹⁾ in the third quarter of 2017 were $35.00, an increase from $27.65 in the prior year quarter due to lower production as a result of planned maintenance and increased maintenance costs.

Production volumes in Exploration and Production (E&P) were 111,500 boe/d in the third quarter of 2017, compared to 110,600 boe/d in the prior year quarter, with higher production from both U.K. and Libya offsetting lower production at Terra Nova due to a planned turnaround and unplanned maintenance.

Continued strong operational performance at R&M contributed to record refinery crude throughput of 466,800 bbls/d in the third quarter of 2017, compared to 465,600 bbls/d in the prior year quarter, and allowed the company to take advantage of increased refined product demand and achieve record retail and wholesale sales volumes in Canada during the third quarter of 2017. Average refinery utilization in the third quarters of both 2017 and 2016 was 101%, reflecting strong reliability in both periods.

"The reliability of our assets in the third quarter was excellent, with several new records established in the period, including record refinery throughput and retail and wholesale sales volumes in Canada," said Williams. "In addition, the successful return of our Oil Sands assets following major maintenance events drove the highest ever Oil Sands production and helped to achieve the lowest Oil Sands operations cash costs per barrel in over a decade."

(1): Non-GAAP financial measures. See the Non-GAAP Financial Measures Advisory section of the MD&A.

2 SUNCOR ENERGY INC. 2017 THIRD QUARTER

Strategy Update

The disciplined execution of Suncor's 2017 capital program is focused on bringing Suncor's major growth projects, Fort Hills and Hebron, to first oil by the end of the year, while continuing to invest in the safety, reliability and efficiency of the company's operating assets.

"We continue to make substantial progress at our major growth projects," said Williams. "At Fort Hills, we have completed an initial test run of the front end of the plant and successfully produced bitumen froth, which significantly de-risks the 2018 production ramp up. At Hebron, drilling has commenced and the project is on track for first oil by the end of the year."

The Fort Hills project was approximately 95% complete at the end of the third quarter of 2017 and remains on target to start production at the end of 2017. In the third quarter of 2017, the front end of the plant was successfully tested as part of the commissioning phase, significantly de-risking the planned ramp up through 2018. Progress continued on secondary extraction during the quarter, with the other asset areas having been handed over to operations. Expenditures in the third quarter of 2017 included a continued focus on early-works sustaining activities that will support the execution of the Fort Hills mine and tailings plan following the commencement of production.

Progress continued on the sale of a combined 49% interest in the East Tank Farm Development to the Fort McKay and Mikisew Cree First Nations for estimated proceeds of approximately $500 million. The company expects to close the arrangement in the fourth quarter of 2017. Operations at the East Tank Farm Development began in the quarter, with the facility now ready for the receipt of Fort Hills bitumen at the end of 2017.

During the third quarter of 2017, drilling at Hebron commenced on schedule, with first oil remaining on track for late 2017. Other E&P activity in the third quarter included development drilling at Hibernia and White Rose, as well as development work on the West White Rose Project and the Norwegian Oda project.

During the third quarter of 2017, Suncor continued efforts with Syncrude to drive operating efficiencies, improve performance and develop regional synergies through integration, with progress being made on improvement opportunities identified by the partners. During the quarter, MacKay River bitumen was successfully processed through the Syncrude upgrading complex to test potential integration.

Under the company's Normal Course Issuer Bid, which commenced in the second quarter of 2017, the company bought back $282 million of its own shares for cancellation in the third quarter of 2017, bringing the year-to-date total shares purchased and cancelled to $578 million.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 3

Operating Earnings (Loss) Reconciliation⁽¹⁾


	Three months ended September 30				Nine months ended September 30
($ millions)	2017		2016		2017		2016

Net earnings (loss)	1 289		392		3 076		(86	)

Unrealized foreign exchange (gain) loss on U.S. dollar denominated debt	(412	)	112		(793	)	(746	)

Non-cash mark to market (gain) loss on interest rate swaps and foreign currency derivatives⁽²⁾	(10	)	22		22		182

Impact of income tax rate adjustment on deferred taxes⁽³⁾	—		(180	)	—		(180	)

Loss on early payment of long-term debt⁽⁴⁾	—		—		10		73

Gain on significant disposals⁽⁵⁾	—		—		(437	)	—

COS acquisition and integration costs⁽⁶⁾	—		—		—		38

Operating earnings (loss)⁽¹⁾	867		346		1 878		(719	)

(1): Operating earnings (loss) is a non-GAAP financial measure. All reconciling items are presented on an after-tax basis. See the Non-GAAP Financial Measures Advisory section of the MD&A.
(2): Non-cash mark to market (gain) loss on forward interest rate swaps and foreign currency derivatives resulting from changes in long-term interest rates and foreign exchange rates in the Corporate segment.
(3): The three- and nine-month periods ended September 30, 2016 were impacted by an adjustment to the company's deferred income taxes resulting from a decrease from 50% to 40% in the U.K. tax rate on oil and gas profits from the North Sea.
(4): Charges associated with the early repayment of debt, net of associated realized foreign currency hedge gains, in the Corporate segment.
(5): Gain of $354 million related to the sale of the company's lubricants business in the R&M segment, combined with a gain of $83 million related to the sale of the company's interest in the Cedar Point wind facility in the Corporate segment.
(6): Transaction and related charges associated with the acquisition of Canadian Oil Sands Limited (COS) in the Corporate segment.

Corporate Guidance

Suncor has updated its full year business environment outlook assumptions for Brent Sollum Voe from US$49.00/bbl to US$53.00/bbl, WTI at Cushing from US$47.00/bbl to US$50.00/bbl, WCS at Hardisty from US$35.00/bbl to US$38.00/bbl and New York Harbor 3-2-1 from US$14.50 to US$17.50. As a result of these updates, full year current income tax assumptions have been increased to $900 million – $1.0 billion from $600 – $900 million. For further details and advisories regarding Suncor's 2017 revised corporate guidance, see www.suncor.com/guidance.

Measurement Conversions

Certain natural gas volumes in this report to shareholders have been converted to boe on the basis of one bbl to six mcf. See the Advisories section of the MD&A.

4 SUNCOR ENERGY INC. 2017 THIRD QUARTER

MANAGEMENT'S DISCUSSION AND ANALYSIS
October 25, 2017

Suncor is an integrated energy company headquartered in Calgary, Alberta, Canada. We are strategically focused on developing one of the world's largest petroleum resource basins – Canada's Athabasca oil sands. In addition, we explore for, acquire, develop, produce and market crude oil and natural gas in Canada and internationally; we transport and refine crude oil, and we market petroleum and petrochemical products primarily in Canada. We also conduct energy trading activities focused principally on the marketing and trading of crude oil, natural gas and byproducts. We also operate a renewable energy business as part of our overall portfolio of assets.

For a description of Suncor's segments, refer to Suncor's Management's Discussion and Analysis for the year ended December 31, 2016, dated March 1, 2017 (the 2016 annual MD&A).

This Management's Discussion and Analysis (MD&A) should be read in conjunction with Suncor's unaudited interim Consolidated Financial Statements for the three-month and nine-month periods ended September 30, 2017, Suncor's audited Consolidated Financial Statements for the year ended December 31, 2016 and the 2016 annual MD&A.

Additional information about Suncor filed with Canadian securities regulatory authorities and the United States Securities and Exchange Commission (SEC), including quarterly and annual reports and Suncor's Annual Information Form dated March 1, 2017 (the 2016 AIF), which is also filed with the SEC under cover of Form 40-F, is available online at www.sedar.com, www.sec.gov and our website www.suncor.com. Information contained in or otherwise accessible through our website does not form part of this document, and is not incorporated into this document by reference.

References to "we", "our", "Suncor", or "the company" mean Suncor Energy Inc., and the company's subsidiaries and interests in associates and jointly controlled entities, unless the context otherwise requires.

Table of Contents


1.	Advisories	5
2.	Third Quarter Highlights	7
3.	Consolidated Financial Information	8
4.	Segment Results and Analysis	13
5.	Capital Investment Update	24
6.	Financial Condition and Liquidity	26
7.	Quarterly Financial Data	30
8.	Other Items	32
9.	Non-GAAP Financial Measures Advisory	33
10.	Common Abbreviations	38
11.	Forward-Looking Information	39

1. ADVISORIES

Basis of Presentation

Unless otherwise noted, all financial information has been prepared in accordance with Canadian generally accepted accounting principles (GAAP), specifically International Accounting Standard (IAS) 34Interim Financial Reporting as issued by the International Accounting Standards Board, which is within the framework of International Financial Reporting Standards (IFRS).

All financial information is reported in Canadian dollars, unless otherwise noted. Production volumes are presented on a working-interest basis, before royalties, except for Libya, which is on an entitlement basis. Certain prior year amounts in the Consolidated Statements of Comprehensive Income (Loss) have been reclassified to conform to the current year's presentation.

References to Oil Sands operations exclude Suncor's interest in Syncrude operations.

Non-GAAP Financial Measures

Certain financial measures in this MD&A – namely operating earnings (loss), funds from (used in) operations, return on capital employed (ROCE), Oil Sands operations cash operating costs, Syncrude cash operating costs, refining margin, refining operating expense, discretionary free cash flow, and last-in, first-out (LIFO) – are not prescribed by GAAP. Operating earnings (loss), Oil Sands operations cash operating costs, Syncrude cash operating costs and LIFO are defined

SUNCOR ENERGY INC. 2017 THIRD QUARTER 5

in the Non-GAAP Financial Measures Advisory section of this MD&A and reconciled to GAAP measures in the Consolidated Financial Information and Segment Results and Analysis sections of this MD&A. Funds from (used in) operations, ROCE, discretionary free cash flow, refining margin and refining operating expense are defined and reconciled to GAAP measures in the Non-GAAP Financial Measures Advisory section of this MD&A.

Risk Factors and Forward-Looking Information

The company's financial and operational performance is potentially affected by a number of factors, including, but not limited to, the factors described within the Forward-Looking Information section of this MD&A. This MD&A contains forward-looking information based on Suncor's current expectations, estimates, projections and assumptions. This information is provided to assist readers in understanding the company's future plans and expectations and may not be appropriate for other purposes. Refer to the Forward-Looking Information section of this MD&A for information on the material risk factors and assumptions underlying our forward-looking information.

Measurement Conversions

Certain crude oil and natural gas liquids volumes have been converted to mcfe on the basis of one bbl to six mcf. Also, certain natural gas volumes have been converted to boe or mboe on the same basis. Any figure presented in mcfe, boe or mboe may be misleading, particularly if used in isolation. A conversion ratio of one bbl of crude oil or natural gas liquids to six mcf of natural gas is based on an energy equivalency conversion method primarily applicable at the burner tip and does not represent a value equivalency at the wellhead. Given that the value ratio based on the current price of crude oil as compared to natural gas is significantly different from the energy equivalency of 6:1, conversion on a 6:1 basis may be misleading as an indication of value.

Common Abbreviations

For a list of abbreviations that may be used in this MD&A, refer to the Common Abbreviations section of this MD&A.

6 SUNCOR ENERGY INC. 2017 THIRD QUARTER

2. THIRD QUARTER HIGHLIGHTS

•

Third quarter financial results.

•: Net earnings for the third quarter of 2017 were $1.289 billion, compared to net earnings of $392 million in the prior year quarter. Net earnings for the third quarter of 2017 were impacted by the same factors that influenced operating earnings described below and included an unrealized after-tax foreign exchange gain of $412 million on the revaluation of U.S. dollar denominated debt, and a non-cash after-tax gain of $10 million on forward interest rate swaps. The net earnings in the prior year quarter included a $180 million deferred tax recovery related to a tax rate reduction on oil and gas profits in the U.K. from 50% to 40%, an unrealized after-tax foreign exchange loss of $112 million on the revaluation of U.S. dollar denominated debt and a non-cash after-tax mark to market loss of $22 million on interest rate derivatives for future debt issuance.
•: Operating earnings⁽¹⁾ for the third quarter of 2017 were $867 million, compared to operating earnings of $346 million for the prior year quarter, with the increase attributed to improved benchmark crack spreads and crude oil pricing, lower exploration expense, with the prior year quarter including a charge for a non-commercial well off the east coast of Canada, record refinery crude throughput and retail and wholesale sales volumes in Canada and also record Oil Sands operations production, partially offset by a stronger Canadian dollar, higher maintenance expense at Syncrude and higher planned maintenance expense and increased costs associated with improved production at Oil Sands operations.
•: Funds from operations⁽¹⁾ were $2.472 billion for the third quarter of 2017, compared to $2.025 billion for the third quarter of 2016, and were impacted by the same factors noted in operating earnings above, excluding the exploration charge from the third quarter of 2016, and also included the impact of favourable current tax recoveries and reassessments from prior periods. Cash flow provided by operating activities, which includes changes in non-cash working capital, was $2.912 billion for the third quarter of 2017, compared to $1.979 billion for the third quarter of 2016.

•

Record upstream production of 739,900 boe/d achieved in the quarter. The record is attributed to increased production at Oil Sands operations, where upgrader and Firebag utilization exceeded 90%.

•

Oil Sands operations cash operating costs⁽¹⁾ averaged $21.60/bbl for the quarter, the lowest in over a decade. Higher production more than offset higher planned maintenance expense and increased costs associated with improved production.

•

Refining and Marketing (R&M) attained a new quarterly crude throughput record of 466,800 bbls/d and utilization rates above 100%. Strong refined product demand led to a quarterly retail and wholesale sales record in Canada and allowed the company to take advantage of a favourable business environment.

•

The Fort Hills project was approximately 95% complete, with an initial test run of the front end of the plant completed in the third quarter of 2017 and first bitumen froth produced. The project remains on track for expected first oil at the end of 2017.

•

Drilling at Hebron commenced on schedule in the third quarter of 2017. First oil remains on track for the end of 2017.

•

Suncor continued to return value to shareholders. The company returned $531 million to shareholders through dividends and bought back $282 million of outstanding shares in the third quarter of 2017.

(1): Operating earnings, funds from operations, and Oil Sands operations cash operating costs are non-GAAP financial measures. See the Non-GAAP Financial Measures Advisory section of this MD&A.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 7

3. CONSOLIDATED FINANCIAL INFORMATION

Financial Highlights


	Three months ended September 30				Nine months ended September 30
($ millions)	2017		2016		2017		2016

Net earnings (loss)

Oil Sands	314		162		339		(1 425	)

Exploration and Production	161		144		515		136

Refining and Marketing	597		436		1 772		1 366

Corporate, Energy Trading and Eliminations	217		(350	)	450		(163	)

Total	1 289		392		3 076		(86	)

Operating earnings (loss)⁽¹⁾

Oil Sands	314		162		339		(1 425	)

Exploration and Production	161		(36	)	515		(44	)

Refining and Marketing	597		436		1 418		1 366

Corporate, Energy Trading and Eliminations	(205	)	(216	)	(394	)	(616	)

Total	867		346		1 878		(719	)

Funds from (used in) operations⁽¹⁾

Oil Sands	1 276		1 236		2 958		1 297

Exploration and Production	375		365		1 294		928

Refining and Marketing	827		595		1 906		1 884

Corporate, Energy Trading and Eliminations	(6	)	(171	)	(35	)	(486	)

Total	2 472		2 025		6 123		3 623

Capital and Exploration Expenditures⁽²⁾

Sustaining	816		555		2 109		1 778

Growth	697		985		2 269		2 798

Total	1 513		1 540		4 378		4 576


	Three months ended September 30		Twelve months ended September 30
($ millions)	2017	2016	2017	2016

Discretionary Free Cash Flow⁽¹⁾	1 116	978	3 759	327

(1): Non-GAAP financial measures. See the Non-GAAP Financial Measures Advisory section of this MD&A.
(2): Excludes capitalized interest.

8 SUNCOR ENERGY INC. 2017 THIRD QUARTER

Operating Highlights


	Three months ended September 30		Nine months ended September 30
	2017	2016	2017	2016

Production volumes by segment

Oil Sands (mbbls/d)	628.4	617.5	544.3	466.0

Exploration and Production (mboe/d)	111.5	110.6	123.8	118.2

Total (mboe/d)	739.9	728.1	668.1	584.2

Production mix

Crude oil and liquids / natural gas (%)	100/0	99/1	99/1	99/1

Refinery utilization (%)	101	101	96	93

Refinery crude oil processed (mbbls/d)	466.8	465.6	444.2	429.0

Net Earnings

Suncor's consolidated net earnings for the third quarter of 2017 were $1.289 billion, compared to net earnings of $392 million for the prior year quarter. Net earnings were primarily affected by the same factors that influenced operating earnings described subsequently in this section of this MD&A. Other items affecting net earnings over these periods included:

•: The after-tax unrealized foreign exchange impact on the revaluation of U.S. dollar denominated debt was a gain of $412 million for the third quarter of 2017; the after-tax unrealized foreign exchange loss on the revaluation of U.S. dollar denominated debt was $112 million for the third quarter of 2016.
•: In the third quarter of 2017, the company recognized a non-cash after-tax gain on forward interest rate swaps of $10 million in the Corporate segment due to an increase in long-term interest rates; the non-cash after-tax loss on forward interest rate swaps due to a decline in long-term interest rates was $22 million in the third quarter of 2016.
•: In the third quarter of 2016, the U.K. government enacted a decrease in the supplementary charge rate on oil and gas profits in the North Sea that reduced the statutory tax rate on Suncor's earnings in the U.K. from 50% to 40%. The company revalued its deferred income tax balances, resulting in a deferred income tax recovery of $180 million in the Exploration and Production (E&P) segment.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 9

Operating Earnings (Loss) Reconciliation⁽¹⁾


	Three months ended September 30				Nine months ended September 30
($ millions)	2017		2016		2017		2016

Net earnings (loss)	1,289		392		3 076		(86	)

Unrealized foreign exchange (gain) loss on U.S. dollar denominated debt	(412	)	112		(793	)	(746	)

Non-cash mark to market (gain) loss on interest rate swaps and foreign currency derivatives⁽²⁾	(10	)	22		22		182

Impact of income tax rate adjustment on deferred taxes⁽³⁾	—		(180	)	—		(180	)

Loss on early payment of long-term debt⁽⁴⁾	—		—		10		73

Gain on significant disposals⁽⁵⁾	—		—		(437	)	—

COS acquisition and integration costs⁽⁶⁾	—		—		—		38

Operating earnings (loss)⁽¹⁾	867		346		1 878		(719	)

(1): Operating earnings (loss) is a non-GAAP financial measure. All reconciling items are presented on an after-tax basis. See the Non-GAAP Financial Measures Advisory section of the MD&A.
(2): Non-cash mark to market (gain) loss on forward interest rate swaps and foreign currency derivatives resulting from changes in long-term interest rates and foreign exchange rates in the Corporate segment.
(3): The three- and nine-month periods ended September 30, 2016 were impacted by an adjustment to the company's deferred income taxes resulting from a decrease from 50% to 40% in the U.K. tax rate on oil and gas profits from the North Sea.
(4): Charges associated with the early repayment of debt, net of associated realized foreign currency hedge gains, in the Corporate segment.
(5): Gain of $354 million related to the sale of the company's lubricants business in the R&M segment, combined with a gain of $83 million related to the sale of the company's interest in the Cedar Point wind facility in the Corporate segment.
(6): Transaction and related charges associated with the acquisition of COS in the Corporate segment.

(1): For an explanation of this bridge analysis, see the Non-GAAP Financial Measures Advisory section of this MD&A.

Suncor's consolidated operating earnings for the third quarter of 2017 were $867 million, compared to $346 million in the prior year quarter, with the increase attributed to improved benchmark crack spreads and crude oil pricing, lower exploration expense, with the prior year quarter including a charge for a non-commercial well off the east coast of Canada, record refinery throughput and retail and wholesale sales volumes in Canada and also record Oil Sands operations production, partially offset by a stronger Canadian dollar, increased maintenance expense at Syncrude and higher planned maintenance expense and increased costs associated with improved production at Oil Sands operations.

10 SUNCOR ENERGY INC. 2017 THIRD QUARTER

Suncor's consolidated operating earnings were $1.878 billion for the first nine months of 2017, compared to an operating loss of $719 million in the prior year period. The increase was attributable to improved crude price realizations and benchmark crack spreads, higher upstream production and improved refinery crude throughput, partially offset by the impact of the disposal of the company's lubricants business and higher operating expenses.

After-Tax Share-Based Compensation Expense by Segment


	Three months ended September 30		Nine months ended September 30
($ millions)	2017	2016	2017	2016

Oil Sands	31	15	52	48

Exploration and Production	4	1	7	4

Refining and Marketing	15	8	27	30

Corporate, Energy Trading and Eliminations	53	27	108	100

Total share-based compensation expense	103	51	194	182

The after-tax share-based compensation expense increased to $103 million during the third quarter of 2017, compared to $51 million during the prior year quarter, as a result of a greater share price increase during the current period when compared to the share price increase in the prior year quarter.

Business Environment

Commodity prices, refining crack spreads and foreign exchange rates are important factors that affect the results of Suncor's operations.

Average for the
Three months ended
September 30

Average for the
Nine months ended
September 30

2017

2016

2017

2016

WTI crude oil at Cushing

US$/bbl

48.20

44.95

49.45

41.35

Dated Brent crude

US$/bbl

52.05

45.85

51.90

41.80

Dated Brent/Maya crude oil FOB price differential

US$/bbl

6.30

6.80

7.05

7.50

MSW at Edmonton

Cdn$/bbl

57.05

55.10

61.20

50.90

WCS at Hardisty

US$/bbl

38.25

31.45

37.60

27.70

Light/heavy differential for WTI at Cushing less WCS at Hardisty

US$/bbl

9.95

13.50

11.90

13.65

Condensate at Edmonton

US$/bbl

47.60

43.05

49.45

40.55

Natural gas (Alberta spot) at AECO

Cdn$/mcf

1.45

2.30

2.30

1.85

Alberta Power Pool Price

Cdn$/MWh

24.55

17.90

22.05

17.00

New York Harbor 3-2-1 crack⁽¹⁾

US$/bbl

22.35

14.00

17.05

13.95

Chicago 3-2-1 crack⁽¹⁾

US$/bbl

19.25

14.15

14.90

13.30

Portland 3-2-1 crack⁽¹⁾

US$/bbl

26.80

18.75

22.15

17.00

Gulf Coast 3-2-1 crack⁽¹⁾

US$/bbl

21.45

14.50

17.40

12.50

Exchange rate

US$/Cdn$

0.80

0.77

0.77

0.76

Exchange rate (end of period)

US$/Cdn$

0.80

0.76

0.80

0.76

(1): 3-2-1 crack spreads are indicators of the refining margin generated by converting three barrels of WTI into two barrels of gasoline and one barrel of diesel. The crack spreads presented here generally approximate the regions into which the company sells refined products through retail and wholesale channels.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 11

Suncor's sweet SCO price realizations are influenced primarily by the price of WTI at Cushing and by the supply and demand for sweet SCO from Western Canada. Price realizations in the third quarter of 2017 for sweet SCO were positively impacted by a higher WTI price of US$48.20/bbl, compared to US$44.95/bbl in the prior year quarter, as well as a favourable differential for SCO relative to WTI. Suncor also produces sour SCO, the price of which is influenced by various crude benchmarks, including, but not limited to, MSW at Edmonton and WCS at Hardisty, and which can also be affected by prices negotiated for spot sales. Prices for MSW at Edmonton increased to $57.05/bbl compared to $55.10/bbl in the prior year quarter and prices for WCS at Hardisty increased to US$38.25/bbl from US$31.45/bbl in the third quarter of 2016.

Bitumen production that Suncor does not upgrade is blended with diluent or SCO to facilitate delivery on pipeline systems. Net bitumen price realizations are therefore influenced by both prices for Canadian heavy crude oil (WCS at Hardisty is a common reference), prices for diluent (Condensate at Edmonton) and SCO. Bitumen price realizations can also be affected by bitumen quality and spot sales.

Suncor's price realizations for production from East Coast Canada and International assets are influenced primarily by the price for Brent crude. Brent crude pricing increased to an average of US$52.05/bbl in the third quarter of 2017, compared to US$45.85/bbl in the prior year quarter.

Natural gas used in Suncor's Oil Sands and Refining operations is primarily referenced to Alberta spot prices at AECO. The average AECO benchmark decreased to $1.45/mcf in the third quarter of 2017, from $2.30/mcf in the prior year quarter.

Suncor's refining margins are influenced primarily by 3-2-1 crack spreads, which are industry indicators approximating the gross margin on a barrel of crude oil that is refined to produce gasoline and distillates, and by light/heavy and light/sour crude differentials. More complex refineries can earn greater refining margins by processing less expensive, heavier crudes. Crack spreads do not necessarily reflect the margins of a specific refinery. Crack spreads are based on current crude feedstock prices whereas actual refining margins are based on FIFO inventory accounting, where a delay exists between the time that feedstock is purchased and when it is processed and sold to a third party. A FIFO loss normally reflects a declining price environment for crude oil and finished products, whereas FIFO gains reflect an increasing price environment for crude oil and finished products. Specific refinery margins are further impacted by actual crude purchase costs, refinery configuration, production mix and realized prices for refined products sales in markets unique to each refinery.

Excess electricity produced in Suncor's Oil Sands operations business is sold to the Alberta Electric System Operator (AESO), with the proceeds netted against the Oil Sands operations cash operating cost per barrel metric. The Alberta power pool price increased to an average of $24.55/MWh in the third quarter of 2017, compared to $17.90/MWh in the prior year quarter.

The majority of Suncor's revenues from the sale of oil and natural gas commodities are based on prices that are determined by or referenced to U.S. dollar benchmark prices. The majority of Suncor's expenditures are realized in Canadian dollars. In the third quarter of 2017, the Canadian dollar strengthened in relation to the U.S. dollar as the average exchange rate increased to US$0.80 per one Canadian dollar from US$0.77 per one Canadian dollar in the prior year quarter. This rate increase had a negative impact on price realizations for the company during the third quarter of 2017 when compared to the prior year quarter.

Suncor also has assets and liabilities, notably approximately 75% of the company's debt, which are denominated in U.S. dollars and translated to Suncor's reporting currency (Canadian dollars) at each balance sheet date. An increase in the value of the Canadian dollar relative to the U.S. dollar from the previous balance sheet date decreases the amount of Canadian dollars required to settle U.S. dollar denominated obligations.

12 SUNCOR ENERGY INC. 2017 THIRD QUARTER

4. SEGMENT RESULTS AND ANALYSIS

OIL SANDS

Financial Highlights


	Three months ended September 30				Nine months ended September 30
($ millions)	2017		2016		2017		2016

Gross revenues	3 233		2 967		9 021		6 166

Less: Royalties	(82	)	(20	)	(180	)	(48	)

Operating revenues, net of royalties	3 151		2 947		8 841		6 118

Net earnings (loss)	314		162		339		(1 425	)

Operating earnings (loss)⁽¹⁾	314		162		339		(1 425	)

Oil Sands operations	*265*		(13	)	*595*		(1 327	)

Oil Sands ventures	49		175		*(256*	)	(98	)

Funds from operations⁽¹⁾	1 276		1 236		2 958		1 297

(1): Non-GAAP financial measures. See the Non-GAAP Financial Measures Advisory section of this MD&A.

(1): For an explanation of this bridge analysis, see the Non-GAAP Financial Measures Advisory section of this MD&A.

Operating earnings for Oil Sands operations were $265 million in the third quarter of 2017, compared to an operating loss of $13 million in the prior year quarter. The improvement was due to higher crude price realizations, increased crude oil production, with a new quarterly record achieved in the period, and lower DD&A, partially offset by the impact of a stronger Canadian dollar, higher planned maintenance expense and increased costs associated with improved production.

Operating earnings for Oil Sands ventures were $49 million in the third quarter of 2017, compared to operating earnings of $175 million in the prior year quarter. The decrease was a result of lower crude oil production, increased maintenance expense, the impact of a stronger Canadian dollar and higher royalties, partially offset by improved benchmark crude pricing.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 13

Production Volumes⁽¹⁾


	Three months ended September 30		Nine months ended September 30
(mbbls/d)	2017	2016	2017	2016

Upgraded product (SCO and diesel)	324.4	301.1	315.3	236.8

Non-upgraded bitumen	144.9	132.6	108.2	118.2

Oil Sands operations	469.3	433.7	423.5	355.0

Oil Sands ventures – Syncrude	159.1	183.8	120.8	111.0

Total	628.4	617.5	544.3	466.0

(1): Bitumen production from Oil Sands Base operations is upgraded, while bitumen production from In Situ operations is either upgraded or sold directly to customers, including Suncor's own refineries. Yields of SCO and diesel from Suncor's upgrading process are approximately 79% of bitumen feedstock input. All of the bitumen produced at Syncrude is upgraded to sweet SCO.

Oil Sands operations production was 469,300 bbls/d in the third quarter of 2017, compared to 433,700 bbls/d in the prior year quarter, with the increase driven by strong upgrader reliability and increased Firebag production. Both periods included planned upgrader maintenance, with production in the prior year period also being impacted by unplanned upgrader maintenance. Upgrader utilization at Oil Sands operations was 93% in the third quarter of 2017, compared to 86% in the prior year quarter.

Sales Volumes


	Three months ended September 30		Nine months ended September 30
(mbbls/d)	2017	2016	2017	2016

Oil Sands operations sales volumes

Sweet SCO	105.9	100.8	111.7	87.4

Diesel	30.4	27.9	30.1	18.7

Sour SCO	183.2	162.5	173.2	137.2

Upgraded product	319.5	291.2	315.0	243.3

Non-upgraded bitumen	120.3	123.5	103.8	122.1

Oil Sands operations	439.8	414.7	418.8	365.4

Oil Sands ventures – Syncrude	159.1	183.8	120.8	111.0

Total	598.9	598.5	539.6	476.4

Sales volumes for Oil Sands operations increased to 439,800 bbls/d in the third quarter of 2017 from 414,700 bbls/d in the prior year quarter due to the same factors as the increase in production.

The overall sales mix was unfavourably impacted by the decrease in Syncrude sweet SCO, which was only partially offset by the increase in sour SCO from Oil Sands operations.

14 SUNCOR ENERGY INC. 2017 THIRD QUARTER

Bitumen Production


		Three months ended September 30		Nine months ended September 30
		2017	2016	2017	2016
	��
Oil Sands Base

Bitumen production (mbbls/d)		328.1	295.1	308.3	222.3

Bitumen ore mined (thousands of tonnes per day)		490.0	433.2	469.3	328.6

Bitumen ore grade quality (bbls/tonne)		0.67	0.68	0.66	0.68

In Situ

Bitumen production – Firebag (mbbls/d)		203.6	197.6	172.5	172.9

Bitumen production – MacKay River (mbbls/d)		30.8	26.6	32.1	25.5

Total In Situ bitumen production (mbbls/d)		234.4	224.2	204.6	198.4

Total Oil Sands Operations bitumen production (mbbls/d)		562.5	519.3	512.9	420.7

Steam-to-oil ratio – Firebag		2.7	2.6	2.7	2.6

Steam-to-oil ratio – MacKay River		3.0	3.4	3.1	3.1

Bitumen production at Oil Sands operations in the third quarter of 2017 increased to 562,500 bbls/d, compared to 519,300 bbls/d in the prior year quarter, due to improved upgrader reliability at Oil Sands Base, and increased production from Firebag following the return to service after completion of the first five-year turnaround of the expanded Firebag central facilities in the second quarter of 2017. Production at MacKay River was impacted by third-party outages in both the third quarters of 2017 and 2016, with the unavailability of a pipeline in 2016 having a more significant impact than the cogeneration facility outage in 2017.

Price Realizations


Net of transportation costs, but before royalties	Three months ended September 30				Nine months ended September 30
($/bbl)	2017		2016		2017		2016

Oil Sands operations

SCO and diesel	56.04		53.73		59.64		46.37

Bitumen	34.32		21.87		31.33		15.15

Crude sales basket (all products)	50.10		44.24		52.61		35.94

Crude sales basket, relative to WTI	(10.15	)	(14.14	)	(11.61	)	(18.47	)

Oil Sands ventures

Syncrude – sweet SCO	60.30		58.33		62.54		53.79

Syncrude, relative to WTI	0.05		(0.05	)	(1.68	)	(0.62	)

Average price realizations at Oil Sands operations increased to $50.10/bbl in the third quarter of 2017 from $44.24/bbl in the prior year quarter, due to narrower heavy crude differentials, higher WTI benchmark prices, and a higher proportion of SCO production in the third quarter of 2017, partially offset by a stronger Canadian dollar.

Average price realizations at Syncrude increased to $60.30/bbl in the third quarter of 2017 from $58.33/bbl in the prior year quarter due to the increase in the WTI benchmark price, partially offset by the impact of a stronger Canadian dollar.

Royalties

Royalties for the Oil Sands segment were higher in the third quarter of 2017 compared to the prior year quarter, primarily due to improved bitumen pricing and higher production.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 15

Expenses and Other Factors

Operating and transportation expenses for the third quarter of 2017 increased from the prior year quarter as a result of increased operating expenses at Syncrude related to higher maintenance costs and continued work to address the facility incident from the first quarter of 2017 and support future reliability. In addition, operating expenses at Oil Sands operations increased due to higher planned maintenance expenses and additional operating costs associated with the increase in production in the third quarter. See the reconciliation in the Cash Operating Costs section below for further details regarding cash operating costs and non-production costs.

DD&A and exploration expenses for the third quarter of 2017 were lower in comparison to the same period of 2016, due to lower depreciation associated with a reduced asset cost base at Oil Sands operations and a decrease in exploration expense.

Cash Operating Costs


	Three months ended September 30				Nine months ended September 30
($ millions)	2017		2016		2017		2016

Oil Sands operations cash operating costs⁽¹⁾ reconciliation

Operating, selling and general expense (OS&G)	1 513		1 420		4 641		4 143

Syncrude OS&G	(525	)	(474	)	(1 659	)	(1 172	)

Non-production costs⁽²⁾	(36	)	(17	)	(68	)	(82	)

Excess power capacity and other⁽³⁾	(58	)	(65	)	(180	)	(146	)

Inventory changes	37		20		1		(105	)

Oil Sands operations cash operating costs⁽¹⁾	931		884		2 735		2 638

Oil Sands operations cash operating costs ($/bbl)⁽¹⁾	21.60		22.15		23.65		27.15

Syncrude cash operating costs⁽¹⁾ reconciliation

Syncrude OS&G	525		474		1 659		1 172

Non-production costs⁽²⁾	(13	)	(7	)	(27	)	(22	)

Syncrude cash operating costs⁽¹⁾	512		467		1 632		1 150

Syncrude cash operating costs ($/bbl)⁽¹⁾	35.00		27.65		49.50		37.85

(1): Non-GAAP financial measures. See the Non-GAAP Financial Measures Advisory section of this MD&A.
(2): Significant non-production costs include, but are not limited to, share-based compensation expense and research expenses.
(3): Excess power capacity and other includes, but is not limited to, the operational revenue impacts of excess power from a cogeneration unit and the natural gas expense recorded as part of a non-monetary arrangement involving a third-party processor.

In the third quarter of 2017, Oil Sands operations cash operating costs per barrel were $21.60, compared to $22.15 in the prior year quarter. This is the lowest Oil Sands operations cash operating costs per barrel in over a decade and is the result of record Oil Sands operations production more than offsetting increased pre-stripping costs and operating expenses associated with the higher production. Total Oil Sands operations cash operating costs increased to $931 million from $884 million in the prior year quarter.

In the third quarter of 2017, non-production costs, which are excluded from Oil Sands operations cash operating costs, were higher than the prior year quarter, primarily due to an increase in share-based compensation expense.

Excess power capacity and other for the third quarter of 2017 represents a smaller reduction to Oil Sands operations cash operating costs than the third quarter of 2016, primarily attributed to lower non-monetary expenses related to a gas swap arrangement with a third-party processor due to lower availability.

Inventory changes in the third quarter of 2017 represent a larger build of inventory than in the prior year quarter, due to increased shipments to the U.S. Gulf Coast in the current period and the additional time required for product delivery.

In the third quarter of 2017, Syncrude cash operating costs per barrel were $35.00, compared to $27.65 in the prior year period, with the increase attributed to lower production combined with an increase in operating expenses related to

16 SUNCOR ENERGY INC. 2017 THIRD QUARTER

higher maintenance costs and continued work to address the facility incident from the first quarter of 2017 and support future reliability. Suncor's share of Syncrude cash operating costs increased to $512 million from $467 million in the previous year quarter.

Results for the First Nine Months of 2017

Oil Sands segment operating earnings for the first nine months of 2017 were $339 million, compared to an operating loss of $1.425 billion for the same period in 2016. Operating earnings improved as a result of higher production, with the prior year period being impacted by the forest fires in the Fort McMurray area and higher crude price realizations, partially offset by the impact of planned major maintenance events at the majority of the company's Oil Sands assets in the second quarter of 2017, the facility incident at Syncrude occurring in the first quarter of 2017 and increased operating and maintenance expenses at both Syncrude and Oil Sands operations, including higher natural gas costs due to an increase in natural gas benchmark pricing and consumption.

Funds from operations for the first nine months of 2017 were $2.958 billion for the segment, compared to $1.297 billion for the same period in 2016, with the increase primarily due to the same factors that influenced operating earnings noted above.

Oil Sands operations cash operating costs per barrel averaged $23.65 for the first nine months of 2017, a decrease from an average of $27.15 for the first nine months of 2016. The decrease was largely driven by higher production due to the impact of the forest fires in the Fort McMurray area in the prior year, partially offset by the impact of planned maintenance activities in the second quarter of 2017 and higher natural gas pricing and consumption.

Syncrude cash operating costs per barrel averaged $49.50 for the first nine months of 2017, an increase from an average of $37.85 for the first nine months of 2016, due to increased operating and maintenance costs and the production impacts of the facility incident and the planned upgrader turnaround combined with accelerated coker maintenance originally scheduled for the fourth quarter of 2017, partially offset by higher overall production due to the impact of the forest fires in the Fort McMurray area during the second quarter of 2016.

Planned Maintenance Update for Operated Assets

The company commenced planned upgrader maintenance in the third quarter of 2017 as well as planned maintenance at MacKay River, and both are expected to be completed early in the fourth quarter. The impact of this maintenance has been included in the company's 2017 guidance.

EXPLORATION AND PRODUCTION

Financial Highlights


	Three months ended September 30				Nine months ended September 30
($ millions)	2017		2016		2017		2016

Gross revenues	766		547		2 538		1 702

Less: Royalties	(132	)	(44	)	(376	)	(118	)

Operating revenues, net of royalties	634		503		2 162		1 584

Net earnings	161		144		515		136

Impact of income tax rate adjustment on deferred taxes⁽¹⁾	—		(180	)	—		(180	)

Operating earnings (loss)⁽²⁾	161		(36	)	515		(44	)

E&P Canada	22		(81	)	82		(60	)

E&P International	*139*		45		*433*		16

Funds from operations⁽²⁾	375		365		1 294		928

(1): Adjustments to the company's deferred income taxes from a decrease from 50% to 40% in the U.K. tax rate on oil and gas profits from the North Sea in the third quarter of 2016.
(2): Non-GAAP financial measures. See also the Non-GAAP Financial Measures Advisory section of this MD&A.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 17

(1): For an explanation of the construction of this bridge analysis, see the Non-GAAP Financial Measures Advisory section of this MD&A.

Operating earnings of $22 million for E&P Canada increased from an operating loss of $81 million in the prior year quarter, as a result of lower exploration expense, due to the prior period incurring a charge for a non-commercial well off the east coast of Canada, and higher price realizations, partially offset by lower production at Terra Nova and the impact of a stronger Canadian dollar.

Operating earnings of $139 million for E&P International improved from $45 million in the prior year quarter, due to increased U.K. and Libya production, higher price realizations, and lower DD&A at Buzzard resulting from an increase in reserves, partially offset by the impact of a stronger Canadian dollar.

Production Volumes


	Three months ended September 30		Nine months ended September 30
(mbbls/d)	2017	2016	2017	2016

E&P Canada

Terra Nova (mbbls/d)	5.8	14.7	10.5	11.0

Hibernia (mbbls/d)	26.6	28.2	28.9	25.6

White Rose (mbbls/d)	9.0	7.5	11.7	11.0

North America Onshore (mboe/d)	1.5	2.7	2.0	2.8

	42.9	53.1	53.1	50.4

E&P International

Buzzard (mboe/d)	44.3	40.8	46.2	48.9

Golden Eagle (mboe/d)	20.5	16.2	20.3	18.5

United Kingdom (mboe/d)	64.8	57.0	66.5	67.4

Libya (mbbls/d)	3.8	0.5	4.2	0.4

	68.6	57.5	70.7	67.8

Total Production (mboe/d)	111.5	110.6	123.8	118.2

Production mix (liquids/gas) (%)	98/2	96/4	97/3	96/4

18 SUNCOR ENERGY INC. 2017 THIRD QUARTER

E&P Canada production averaged 42,900 boe/d in the third quarter of 2017, compared to 53,100 boe/d in the prior year quarter. The decrease was primarily due to planned and unplanned maintenance at Terra Nova.

E&P International production increased to 68,600 boe/d in the third quarter of 2017, compared to 57,500 boe/d in the prior year quarter, due to higher production from Buzzard and Golden Eagle as a result of planned maintenance at both properties during the prior year period, and higher production from Libya.

Price Realizations


	Three months ended September 30		Nine months ended September 30
Net of transportation costs, but before royalties	2017	2016	2017	2016

Exploration and Production

E&P Canada – Crude oil and natural gas liquids ($/bbl)	65.06	59.26	66.00	53.69

E&P Canada – Natural gas ($/mcfe)	0.60	1.94	2.08	1.47

E&P International ($/boe)	60.88	55.27	62.89	49.56

Price realizations for crude oil from E&P Canada and E&P International were higher in the third quarter of 2017, compared to the prior year quarter, primarily due to an increase in benchmark crude pricing, partially offset by a stronger Canadian dollar.

Royalties

Royalties were higher in the third quarter of 2017, compared to the prior year quarter, due to improved crude prices, partially offset by decreased production from E&P Canada.

Expenses and Other Factors

Operating and transportation expenses were comparable to the prior year quarter. Continued focus on cost reduction and favourable foreign exchange that reduced expenses in the U.K. was offset by increased activity in Libya.

DD&A expense decreased in the third quarter of 2017, compared to the prior year quarter, due to lower depletion rates at Buzzard, partially offset by higher U.K. production.

Exploration expense decreased in the third quarter of 2017 due to the prior period incurring a charge for a non-commercial well off the east coast of Canada.

Results for the First Nine Months of 2017

Operating earnings for E&P in the first nine months of 2017 were $515 million, compared to an operating loss of $44 million for the first nine months of 2016. The increase was primarily due to higher crude price realizations, increased production, lower DD&A, lower exploration expense due to the prior period including a charge for a non-commercial well off the east coast of Canada, and decreased operating costs, partially offset by higher royalties, attributed to higher crude pricing and production increases.

Funds from operations were $1.294 billion for the first nine months of 2017, compared to $928 million for the same period in 2016, and increased due to higher price realizations, increased production and lower operating costs, partially offset by higher royalties.

Planned Maintenance Update for Operated Assets

The planned maintenance event at Terra Nova was completed within the third quarter of 2017 and there are no planned events for the fourth quarter of 2017.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 19

REFINING AND MARKETING

Financial Highlights


	Three months ended September 30		Nine months ended September 30
($ millions)	2017	2016	2017		2016

Operating revenues	5 140	4 711	14 537		12 892

Net earnings	597	436	1 772		1 366

Adjusted for:

Gain on significant disposal⁽¹⁾	—	—	(354	)	—

Operating earnings⁽²⁾	597	436	1 418		1 366

Refining and Supply	*527*	332	*1 183*		1 088

Marketing	70	104	*235*		278

Funds from operations⁽²⁾	827	595	1 906		1 884

(1): After-tax gain related to the sale of the company's lubricants business.
(2): Non-GAAP financial measures. See the Non-GAAP Financial Measures Advisory section of this MD&A.

(1): For an explanation of this bridge analysis, see the Non-GAAP Financial Measures Advisory section of this MD&A.

R&M operating earnings on a FIFO basis were $597 million, compared to $436 million in the prior year quarter, with the increase described below. Using a LIFO⁽¹⁾ method of inventory valuation, which management uses to assess performance, earnings were $624 million compared to $485 million in the prior year quarter, after removing the impact of the sale of the company's lubricants business in the first quarter of 2017.

Refining and Supply operating earnings were $527 million in the third quarter of 2017, compared to $332 million in the prior year quarter. The increase was attributed to higher benchmark crack spreads, partially offset by the impact of the stronger Canadian dollar. Strong reliability resulting in record refinery crude throughput, a third-party recovery of previously incurred environmental expenses, which has been recorded in Financing Expense and Other, and a smaller FIFO loss also contributed to the increase in operating earnings.

(1): Non-GAAP financial measure. See the Non-GAAP Financial Measures Advisory section of this MD&A.

20 SUNCOR ENERGY INC. 2017 THIRD QUARTER

Marketing activities contributed $70 million to operating earnings in the third quarter of 2017, compared to $104 million in the prior year quarter, which included $23 million of operating earnings from the lubricants business divested in the first quarter of 2017. After removing the impact of the lubricants business, marketing operating earnings were lower quarter-over-quarter, due to decreased retail and wholesale margins as a result of competitive pricing, partially offset by record retail and wholesale sales volumes in Canada.

During the first quarter of 2017, Suncor completed the sale of its Petro-Canada lubricants business, which contributed $41 million in net earnings and $43 million in funds from operations in the third quarter of 2016. The impact of the lubricants sale has been reflected in Financing Expense and Other in the bridge analysis above.

Volumes


	Three months ended September 30		Nine months ended September 30
	2017	2016	2017	2016

Crude oil processed (mbbls/d)

Eastern North America	213.9	213.5	212.3	202.4

Western North America	252.9	252.1	231.9	226.6

Total	466.8	465.6	444.2	429.0

Refinery utilization⁽¹⁾ (%)

Eastern North America	96	96	96	91

Western North America	105	105	97	94

Total	101	101	96	93

Refined product sales (mbbls/d)

Gasoline	257.6	254.4	241.6	245.3

Distillate	212.5	195.2	198.7	185.9

Other	94.4	99.1	91.4	92.5

Total	564.5	548.7	531.7	523.7

Refining margin⁽²⁾ ($/bbl)	23.80	17.75	21.70	19.40

Refining operating expense⁽²⁾ ($/bbl)	4.50	4.55	5.00	5.00

(1): Refinery utilization is the amount of crude oil and natural gas plant liquids run through crude distillation units, expressed as a percentage of the capacity of these units.
(2): Non-GAAP financial measures. See the Non-GAAP Financial Measures Advisory section of this MD&A.

Refinery crude throughput in the third quarter of 2017 increased to 466,800 bbls/d, compared to 465,600 bbls/d in the prior year quarter, reflecting strong reliability at all refineries.

Total refined product sales increased to 564,500 bbls/d in the third quarter of 2017, compared to 548,700 bbls/d in the prior year quarter, with the increase attributed to stronger demand.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 21

Prices and Margins

Refined product margins in Refining and Supply were higher in the third quarter of 2017 compared to the prior year quarter, and were impacted primarily by the following factors:

•: Higher benchmark refining crack spreads, driven by strong refined product demand and refinery outages in the U.S. Gulf Coast as a result of hurricane activity in that region, partially offset by the impact of the stronger Canadian dollar, narrower crude differentials and weaker product location differentials.
•: In the third quarter of 2017, the impact of the FIFO method of inventory valuation, as used by the company, relative to an estimated LIFO⁽¹⁾ method, had a negative impact on operating earnings of $27 million after-tax, compared to a negative impact on operating earnings of $86 million after-tax in the prior year quarter, for a favourable quarter-over-quarter impact of $59 million.

Marketing margins in the third quarter of 2017, excluding the impact of the sale of the lubricants business in the first quarter of 2017, were lower than margins in the prior year quarter, primarily due to competitive pricing, which decreased retail and wholesale margins, partially offset by record retail and wholesale sales volumes in Canada.

Expenses and Other Factors

After removing the impact of the lubricants business, which was sold in the first quarter of 2017, operating expenses in the third quarter of 2017 were higher than the prior year quarter, due to increased maintenance expenses, increased share-based compensation and increased variable selling costs associated with the increase in sales volumes.

Financing Expense and Other includes the net impact of the sale of the lubricants business in the first quarter of 2017, offset by a third-party recovery of previously recorded environmental expenses.

Results for the First Nine Months of 2017

For the first nine months of 2017, Refining and Marketing segment operating earnings were $1.418 billion, which was comparable to $1.366 billion for the first nine months of 2016, with improved benchmark crack spreads combined with favourable product location differentials, higher refinery throughput and increased sales, including record year-to-date retail and wholesale sales volumes in Canada, more than offsetting the impact of the sale of the lubricants business in the first quarter of 2017, narrower crude differentials and a larger FIFO loss. For the first nine months of 2017, the impact of the FIFO method of inventory valuation, as used by the company, relative to an estimated LIFO method, had a negative impact to operating earnings and funds from operations of $22 million after-tax, compared to the negative impact to net earnings and funds from operations of $3 million after-tax in the first nine months of 2016.

Funds from operations were $1.906 billion for the first nine months of 2017, compared to $1.884 billion for the first nine months of 2016, and decreased primarily due to the same factors that influenced operating earnings.

Suncor completed the sale of its Petro-Canada lubricants business during the first quarter of 2017, which contributed $8 million in net earnings and $11 million in funds from operations for the first nine months of 2017, compared to $99 million in net earnings and $143 million in funds from operations for the first nine months of 2016.

(1): The estimated impact of the LIFO method is a non-GAAP financial measure. See the Non-GAAP Financial Measures Advisory section of this MD&A.

22 SUNCOR ENERGY INC. 2017 THIRD QUARTER

CORPORATE, ENERGY TRADING AND ELIMINATIONS

Financial Highlights


	Three months ended September 30				Nine months ended September 30
($ millions)	2017		2016		2017		2016

Net earnings (loss)	217		(350	)	450		(163	)

Adjusted for:

Unrealized foreign exchange (gain) loss on U.S. dollar denominated debt	(412	)	112		(793	)	(746	)

Non-cash mark to market (gain) loss on interest rate swaps and foreign currency derivatives⁽¹⁾	(10	)	22		22		182

Non-cash loss on early payment of long-term debt⁽²⁾	—		—		10		73

Gain on significant disposal⁽³⁾	—		—		(83	)	—

COS acquisition and related costs⁽⁴⁾	—		—		—		38

Operating (loss) earnings⁽⁵⁾	(205	)	(216	)	(394	)	(616	)

Renewable Energy	(2	)	2		(3	)	15

Energy Trading	*(32*	)	(7	)	*(47*	)	(15	)

Corporate	*(129*	)	(195	)	*(344*	)	(603	)

Eliminations	*(42*	)	(16	)	—		(13	)

Funds (used in) from operations⁽⁵⁾	(6	)	(171	)	(35	)	(486	)

(1): Non-cash mark to market after-tax (gain) loss on interest rate swaps and foreign currency derivatives resulting from changes in long-term interest rates and foreign exchange rates.
(2): Charges associated with the early repayment of debt, net of associated realized foreign currency hedge gains.
(3): After-tax gain related to the sale of the company's interest in the Cedar Point wind facility.
(4): After-tax transaction and related charges associated with the acquisition of COS.
(5): Non-GAAP financial measures. See the Non-GAAP Financial Measures Advisory section of this MD&A.

Renewable Energy


	Three months ended September 30		Nine months ended September 30
	2017	2016	2017	2016

Power generation marketed (gigawatt hours)⁽¹⁾	32	84	195	327

(1): Power generated includes curtailed production for which the company was compensated.

Renewable Energy had an operating loss of $2 million in the third quarter of 2017, compared to operating earnings of $2 million in the prior year quarter. The decrease was due to lower production associated with the sale of the company's interest in the Cedar Point wind facility, which was effective January 1, 2017, and the sale of the Ripley wind facility, which was effective July 10, 2017.

During the quarter, Suncor completed the sale of its interest in the Ripley wind facility for proceeds of $48 million, with proceeds being equal to net book value.

Energy Trading

The operating loss for Energy Trading was $32 million in the quarter, compared to an operating loss of $7 million in the prior year quarter, due to weak crude location spreads.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 23

Corporate

The Corporate operating loss was $129 million for the third quarter of 2017, compared to an operating loss of $195 million for the prior year quarter. The decrease was primarily due to tax recoveries and reassessments from prior periods, higher capitalized interest, a decrease in functional costs attributed to the company's continued cost reduction efforts and lower interest expense as a result of debt repayments in the second quarter of 2017, partially offset by an increase in share-based compensation expense. The company capitalized $182 million of its borrowing costs in the third quarter of 2017 as part of the cost of major development assets and construction projects in progress, compared to $153 million in the prior year quarter.

Eliminations

Eliminations reflect the elimination of profit on crude oil sales from Oil Sands and East Coast Canada to Refining and Supply. Consolidated profits are only realized when the refined products produced from internal purchases of crude feedstock have been sold to third parties. During the third quarter of 2017, the company eliminated $42 million of after-tax intersegment profit, compared to eliminating $16 million of after-tax intersegment profit in the prior year quarter, with the change attributed to higher crude margins and an increase in intersegment inventory levels following the completion of Oil Sands maintenance.

Corporate, Energy Trading and Eliminations funds used in operations for the third quarter of 2017 were $6 million, compared to funds used in operations of $171 million in the prior year period. In addition to the factors noted above in operating earnings, funds from operations were favourably impacted by current tax recoveries and reassessments from prior periods.

Results for the First Nine Months of 2017

The operating loss for Corporate, Energy Trading and Eliminations for the first nine months of 2017 was $394 million, compared to an operating loss of $616 million for the first nine months of 2016. In addition to the factors noted in the quarterly summary above, the operating loss for the first nine months of 2017 was favourably impacted by a realized gain on forward interest rate swaps. The company capitalized $552 million of its borrowing costs in the first nine months of 2017 as part of the cost of major development assets and construction projects, compared to $434 million of capitalized borrowing costs in the first nine months of 2016, with the increase due to higher accumulated expenditures on major growth projects.

Corporate, Energy Trading and Eliminations funds used in operations for the first nine months of 2017 were $35 million, compared to $486 million in the prior year period. In addition to the factors noted above in operating earnings, funds from operations were favourably impacted by tax recoveries associated with the early repayment of debt in the second quarter of 2017 and tax recoveries and reassessments relating to prior periods.

5. CAPITAL INVESTMENT UPDATE

Capital and Exploration Expenditures by Segment


	Three months ended September 30				Nine months ended September 30
($ millions)	2017		2016		2017		2016

Oil Sands	1 340		1 306		3 899		3 667

Exploration and Production	189		283		631		829

Refining and Marketing	159		101		385		502

Corporate, Energy Trading and Eliminations	7		3		15		12

Total capital and exploration expenditures	1 695		1 693		4 930		5 010

Less: capitalized interest on debt	(182	)	(153	)	(552	)	(434	)

	1 513		1 540		4 378		4 576

24 SUNCOR ENERGY INC. 2017 THIRD QUARTER

Capital and Exploration Expenditures by Type⁽¹⁾

Three months ended September 30, 2017

Nine months ended September 30, 2017

($ millions)

Sustaining(2)

Growth(3)

Total

Sustaining(2)

Growth(3)

Total

Oil Sands

Oil Sands Base

451

483

1 024

167

1 191

In Situ

—

246

252

Oil Sands ventures

122

531

653

426

1 623

2 049

Exploration and Production

134

140

473

487

Refining and Marketing

158

—

158

384

—

384

Corporate, Energy Trading and Eliminations

—

816

697

1 513

2 109

2 269

4 378

(1): Capital expenditures in this table exclude capitalized interest on debt.
(2): Sustaining capital expenditures include capital investments that i) ensure compliance or maintain relations with regulators and other stakeholders; ii) improve efficiency and reliability of operations or maintain productive capacity by replacing component assets at the end of their useful lives; iii) deliver existing proved developed reserves for E&P operations; or iv) maintain current production capacities at existing Oil Sands and R&M operations.
(3): Growth capital expenditures include capital investments that result in i) an increase in production levels at existing Oil Sands and R&M operations; ii) new facilities or operations that increase overall production; iii) new infrastructure that is required to support higher production levels; iv) new reserves or a positive change in the company's reserves profile in E&P operations; or v) margin improvement, by increasing revenues or reducing costs.

In the third quarter of 2017, total capital and exploration expenditures were $1.513 billion (excluding capitalized interest). Capital and exploration expenditures in the third quarter of 2017 were lower than the prior year quarter, due to a decrease in growth expenditures, predominantly associated with Fort Hills and Hebron as peak construction activity for those projects has passed, partially offset by increased sustaining capital related to major maintenance activities.

Activity in the third quarter of 2017 is summarized by business unit below.

Oil Sands

Oil Sands Base

Oil Sands Base capital and exploration expenditures were $483 million in the third quarter of 2017, the majority of which were directed towards sustaining activities primarily focused on planned upgrader maintenance. Capital expenditures also included various reliability and sustainment projects across the operations. Growth capital at Oil Sands Base was focused on the East Tank Farm Development, which was commissioned in the third quarter of 2017 and will support market access for Fort Hills bitumen production.

In Situ

In Situ capital and exploration expenditures were $72 million and were directed towards sustaining activities, including planned maintenance at MacKay River which is expected to be completed early in the fourth quarter, and ongoing well pad construction that is expected to maintain existing production levels at Firebag and MacKay River.

Oil Sands Ventures

Oil Sands ventures capital and exploration expenditures were $653 million, of which growth capital expenditures were $531 million and sustaining capital expenditures were $122 million.

Growth capital was primarily for the Fort Hills mining project, which was approximately 95% complete at the end of the third quarter of 2017. The front end of the plant has been successfully tested as part of the commissioning phase, significantly de-risking the planned ramp up through 2018. Progress continued on secondary extraction during the quarter, with all other asset areas having now been handed over to operations. The project remains on target for first oil at the end of 2017.

Sustaining capital expenditures in the third quarter of 2017 at Fort Hills continued to focus on early-works sustaining activities that will support the execution of the Fort Hills mine and tailings plan following first oil.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 25

Syncrude sustaining capital in the third quarter of 2017 was primarily focused on permanent repairs associated with the facility incident from the first quarter of 2017, for which Suncor expects to receive some insurance proceeds as early as the fourth quarter of 2017, and the completion of planned coker maintenance in the early part of the quarter. The coker maintenance completed in the period was originally scheduled for the fourth quarter of 2017 and was advanced to coincide with the unplanned outage, which impacted the second quarter of 2017, in order to mitigate the impact to annual production. Capital expenditures also included various reliability and sustainment projects across the operations to support the execution of the mine-tailings plan.

Exploration and Production

During the third quarter of 2017, drilling of the first production well at Hebron commenced on schedule and first oil remains on track for late 2017. Other E&P activity in the third quarter included development drilling at Hibernia, White Rose, as well as development work on the West White Rose Project and the Norwegian Oda project.

Refining and Marketing

R&M capital expenditures were $158 million and were primarily related to ongoing sustainment of operations, including planned refinery maintenance, enhancements to retail operations and information technology upgrades.

Corporate, Energy Trading and Eliminations

Corporate capital expenditures were $7 million, with the majority of the spending directed towards the company's information technology initiatives.

6. FINANCIAL CONDITION AND LIQUIDITY

Indicators


	Twelve months ended September 30
	2017	2016

Return on Capital Employed⁽¹⁾ (%)

Excluding major projects in progress	7.0	(4.6	)

Including major projects in progress	5.5	(3.9	)

Net debt to funds from operations⁽²⁾ (times)	1.6	3.0

Interest coverage on long-term debt (times)

Earnings basis⁽³⁾	5.2	(3.0	)

Funds from operations basis⁽²⁾⁽⁴⁾	10.2	5.4

(1): Non-GAAP financial measure. ROCE is reconciled in the Non-GAAP Financial Measures Advisory section of this MD&A.
(2): Funds from operations and metrics that use funds from operations are non-GAAP financial measures. See the Non-GAAP Financial Measures Advisory section of this MD&A.
(3): Net earnings plus income taxes and interest expense, divided by the sum of interest expense and capitalized interest on debt.
(4): Funds from operations plus current income taxes and interest expense, divided by the sum of interest expense and capitalized interest on debt.

Capital Resources

Suncor's capital resources consist primarily of cash flow provided by operating activities, cash and cash equivalents, available lines of credit and the divestiture of non-core assets. Suncor's management believes the company will have the capital resources to fund its planned 2017 capital spending program of $5.4 to $5.6 billion and to meet current and future working capital requirements, including $1.449 billion of long-term debt due in the second quarter of 2018, through cash balances and cash equivalents, cash flow provided by operating activities, available committed credit facilities, issuing commercial paper, divesting of non-core assets and accessing capital markets. The company's cash flow provided by operating activities depends on a number of factors, including commodity prices, production and sales volumes, refining and marketing margins, operating expenses, taxes, royalties and foreign exchange rates.

26 SUNCOR ENERGY INC. 2017 THIRD QUARTER

The company has invested cash in short-term financial instruments that are presented as cash and cash equivalents. The objectives of the company's short-term investment portfolio are to ensure the preservation of capital, maintain adequate liquidity to meet Suncor's cash flow requirements and deliver competitive returns derived from the quality and diversification of investments within acceptable risk parameters. The maximum weighted average term to maturity of the short-term investment portfolio is not expected to exceed six months, and all investments will be with counterparties with investment grade debt ratings.

Available Sources of Liquidity

Cash and cash equivalents decreased to $2.757 billion during the first nine months of 2017 from $3.016 billion at December 31, 2016. The decrease is primarily due to the repayment of US$1.250 billion in long-term indebtedness, the purchase of the company's own shares under the normal course issuer bid (NCIB), and capital and exploration expenditures and dividend requirements exceeding cash flow provided by operating activities, partially offset by the proceeds from the sales of the company's lubricants business, its interest in the Cedar Point wind facility and the Ripley wind facility, as well as an increase in short-term indebtedness.

As capital spending on major growth projects starts to ramp down, the company expects that less cash will be required for funding purposes in the future, supporting the repayment of long-term debt and returning cash to shareholders, subject to prevailing economic conditions and other relevant factors.

As at September 30, 2017, the weighted average term to maturity of the short-term investment portfolio was approximately 18 days.

Available credit facilities for liquidity purposes at September 30, 2017 decreased to $5.546 billion, compared to $7.467 billion at December 31, 2016, as a result of the cancellation of a $950 million credit facility that was acquired through the acquisition of COS combined with an increase in short-term indebtedness. The cancelled credit facility is no longer expected to be required for liquidity purposes and the termination will reduce future financing expense.

Financing Activities

Management of debt levels continues to be a priority for Suncor given the company's long-term growth plans and the current pricing environment. Suncor believes a phased and flexible approach to existing and future growth projects should assist the company in maintaining its ability to manage project costs and debt levels.

During the second quarter of 2017, Suncor repaid US$1.250 billion of 6.10% notes originally scheduled to mature June 1, 2018 to reduce financing costs and provide ongoing balance sheet flexibility. A premium was paid to early settle the debt, with future interest savings more than offsetting this amount. The repayment was primarily funded with the proceeds from asset divestments realized in the first quarter of 2017.

Progress continued on the sale of a combined 49% interest in the East Tank Farm Development with the Fort McKay and Mikisew Cree First Nations for estimated proceeds of approximately $500 million. The company expects to close the arrangement in the fourth quarter of 2017.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 27

Total Debt to Total Debt Plus Shareholders' Equity

Suncor is subject to financial and operating covenants related to its bank debt and public market debt. Failure to meet the terms of one or more of these covenants may constitute an "event of default" as defined in the respective debt agreements, potentially resulting in accelerated repayment of one or more of the debt obligations. The company is in compliance with its financial covenant that requires total debt to not exceed 65% of its total debt plus shareholders' equity. At September 30, 2017, total debt to total debt plus shareholders' equity was 25.9% (December 31, 2016 – 28.1%). The company continues to be in compliance with all operating covenants.


($ millions, except as noted)	September 30 2017	December 31 2016

Short-term debt	2 060	1 273

Current portion of long-term debt	1 509	54

Long-term debt	12 278	16 103

Total debt	15 847	17 430

Less: Cash and cash equivalents	2 757	3 016

Net debt	13 090	14 414

Shareholders' equity	45 378	44 630

Total debt plus shareholders' equity	61 225	62 060

Total debt to total debt plus shareholders' equity (%)	25.9	28.1

Change in Debt


	Three and nine months ended September 30, 2017
($ millions)	Q3		YTD

Total debt – beginning of period	16 132		17 430

Decrease in long-term debt	(14	)	(1 768	)

Increase in short-term debt	98		925

Foreign exchange on debt, and other	(369	)	(740	)

Total debt – September 30, 2017	15 847		15 847

Less: Cash and cash equivalents – September 30, 2017	2 757		2 757

Net debt – September 30, 2017	13 090		13 090

The company's total debt position improved in the third quarter due to the impact of favourable foreign exchange rates on U.S. dollar denominated debt, partially offset by an increase in short-term borrowings.

On a year-to-date basis, the company's total debt position improved due to the early repayment of US$1.250 billion of 6.10% notes originally scheduled to mature on June 1, 2018 and the impact of favourable foreign exchange rates on U.S. dollar denominated debt, partially offset by an increase in short-term borrowings.

Common Shares

Outstanding Shares


(thousands)		September 30, 2017

Common shares		1 656 455

Common share options – exercisable		20 496

Common share options – non-exercisable		14 016

28 SUNCOR ENERGY INC. 2017 THIRD QUARTER

As at October 23, 2017, the total number of common shares outstanding was 1,654,857,919 and the total number of exercisable and non-exercisable common share options outstanding was 33,930,867. Once exercisable, each outstanding common share option is convertible into one common share.

Share Repurchases

The company may repurchase shares pursuant to the NCIB through the facilities of the Toronto Stock Exchange, New York Stock Exchange and/or alternative trading platforms. Under the NCIB, the company may purchase for cancellation up to approximately $2.0 billion worth of its common shares from May 2, 2017 to May 1, 2018 and has agreed that it will not purchase more than 50,079,795 common shares, which was equal to approximately 3% of Suncor's issued and outstanding common shares.


	Three months ended September 30		Nine months ended September 30
($ millions, except as noted)	2017	2016	2017	2016

Share repurchase activities (thousands of common shares)	7 220	—	14 441	—

Weighted average repurchase price per share (dollars per share)	39.19	—	40.06	—

Share repurchase cost	282	—	578	—

During the third quarter of 2017, the company repurchased 7,219,782 common shares at an average price of $39.19 per share, for $282 million. During the nine months ended September 30, 2017, the company repurchased 14,440,535 common shares at an average price of $40.06 per share, for $578 million. Suncor did not purchase any of its shares pursuant to a normal course issuer bid during the three months ended September 30, 2016 or the first nine months of 2016.

Contractual Obligations, Commitments, Guarantees, and Off-Balance Sheet Arrangements

In the normal course of business, the company is obligated to make future payments, including contractual obligations and non-cancellable commitments. Suncor has included these items in the Financial Condition and Liquidity section of its 2016 annual MD&A and has provided an update below. The company does not believe that it has any guarantees or off-balance sheet arrangements that have, or are reasonably likely to have, a current or future material effect on the company's financial performance or financial condition, results of operations, liquidity or capital expenditures.

During the nine months ended September 30, 2017, the company decreased its commitments by approximately $1.3 billion (undiscounted), which is primarily related to the early repayment of US$1.250 billion of 6.10% notes originally scheduled to mature on June 1, 2018 and the reduction in commitments associated with the sale of Suncor's lubricants business, partially offset by a lodging services commitment that supports Suncor's Oil Sands Base operations and the recognition of incremental Hebron decommissioning costs following the milestones achieved during the second quarter of 2017.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 29

7. QUARTERLY FINANCIAL DATA

Trends in Suncor's quarterly revenue, earnings and funds from operations⁽¹⁾ are driven primarily by production volumes, which can be significantly impacted by major maintenance events, changes in commodity prices, refining crack spreads, foreign exchange rates and other significant events impacting operations, such as the Syncrude facility incident that occurred late in the first quarter of 2017, which significantly impacted the second quarter of 2017, and the forest fires in the Fort McMurray area in the second quarter of 2016.

Financial Summary


Three months ended ($ millions, unless otherwise noted)	Sep 30 2017	Jun 30 2017	Mar 31 2017	Dec 31 2016		Sep 30 2016		Jun 30 2016		Mar 31 2016		Dec 31 2015

Total production (mboe/d)

Oil Sands	628.4	413.6	590.6	620.4		617.5		213.1		565.8		470.6

Exploration and Production	111.5	125.5	134.5	118.1		110.6		117.6		125.6		112.3

	739.9	539.1	725.1	738.5		728.1		330.7		691.4		582.9

Revenues and other income

Operating revenues, net of royalties	7 986	7 247	7 818	7 840		7 409		5 914		5 644		6 499

Other income (loss)	43	16	25	301		(15	)	(58	)	(67	)	94

	8 029	7 263	7 843	8 141		7 394		5 856		5 577		6 593

Net earnings (loss)	1 289	435	1 352	531		392		(735	)	257		(2 007	)

per common share – basic (dollars)	0.78	0.26	0.81	0.32		0.24		(0.46	)	0.17		(1.38	)

per common share – diluted (dollars)	0.78	0.26	0.81	0.32		0.24		(0.46	)	0.17		(1.38	)

Operating earnings (loss)⁽¹⁾	867	199	812	636		346		(565	)	(500	)	(26	)

per common share – basic⁽¹⁾ (dollars)	0.52	0.12	0.49	0.38		0.21		(0.36	)	(0.33	)	(0.02	)

Funds from operations⁽¹⁾	2 472	1 627	2 024	2 365		2 025		916		682		1 294

per common share – basic⁽¹⁾ (dollars)	1.49	0.98	1.21	1.42		1.22		0.58		0.45		0.90

Cash flow provided by operating activities	2 912	1 671	1 628	2 791		1 979		862		48		1 443

per common share – basic (dollars)	1.75	1.00	0.98	1.68		1.19		0.54		0.03		1.00

ROCE⁽¹⁾ (%) for the twelve months ended	7.0	6.2	4.4	0.5		(4.6	)	(4.9	)	(2.2	)	0.6

After-tax unrealized foreign exchange gain (loss) on U.S. dollar denominated debt	412	278	103	(222	)	(112	)	(27	)	885		(382	)

Common share information (dollars)

Dividend per common share	0.32	0.32	0.32	0.29		0.29		0.29		0.29		0.29

Share price at the end of trading

Toronto Stock Exchange (Cdn$)	43.73	37.89	40.83	43.90		36.42		35.84		36.17		35.72

New York Stock Exchange (US$)	35.03	29.20	30.75	32.69		27.78		27.73		27.81		25.80

(1): Non-GAAP financial measures. See the Non-GAAP Financial Measures Advisory section of this MD&A. ROCE excludes capitalized costs related to major projects in progress.

30 SUNCOR ENERGY INC. 2017 THIRD QUARTER

Business Environment


Three months ended (average for the period ended, except as noted)		Sep 30 2017	Jun 30 2017	Mar 31 2017	Dec 31 2016	Sep 30 2016	Jun 30 2016	Mar 31 2016	Dec 31 2015

WTI crude oil at Cushing	US$/bbl	48.20	48.30	51.85	49.35	44.95	45.60	33.50	42.15

Dated Brent crude	US$/bbl	52.05	49.85	53.75	49.50	45.85	45.60	33.90	43.70

Dated Brent/Maya FOB price differential	US$/bbl	6.30	5.80	9.05	6.70	6.80	7.65	8.95	10.35

MSW at Edmonton	Cdn$/bbl	57.05	62.30	64.25	62.00	55.10	55.80	34.50	53.55

WCS at Hardisty	US$/bbl	38.25	37.20	37.30	35.00	31.45	32.30	19.30	27.70

Light/heavy crude oil differential for WTI at Cushing less WCS at Hardisty	US$/bbl	9.95	11.10	14.55	14.35	13.50	13.30	14.25	14.50

Condensate at Edmonton	US$/bbl	47.60	48.45	52.20	48.35	43.05	44.10	34.45	41.65

Natural gas (Alberta spot) at AECO	Cdn$/mcf	1.45	2.80	2.70	3.10	2.30	1.40	1.85	2.45

Alberta Power Pool Price	Cdn$/MWh	24.55	19.30	22.40	21.95	17.90	14.90	18.10	21.20

New York Harbor 3-2-1 crack⁽¹⁾	US$/bbl	22.35	16.35	12.55	14.35	14.00	16.10	11.75	13.60

Chicago 3-2-1 crack⁽¹⁾	US$/bbl	19.25	14.40	11.15	10.55	14.15	16.65	9.10	13.90

Portland 3-2-1 crack⁽¹⁾	US$/bbl	26.80	21.25	18.45	14.95	18.75	19.30	13.00	17.90

Gulf Coast 3-2-1 crack⁽¹⁾	US$/bbl	21.45	16.80	14.00	13.15	14.50	14.85	11.05	11.05

Exchange rate	US$/Cdn$	0.80	0.74	0.76	0.75	0.77	0.78	0.73	0.75

Exchange rate (end of period)	US$/Cdn$	0.80	0.77	0.75	0.74	0.76	0.77	0.77	0.72

(1): 3-2-1 crack spreads are indicators of the refining margin generated by converting three barrels of WTI into two barrels of gasoline and one barrel of diesel. The crack spreads presented here generally approximate the regions into which the company sells refined products through retail and wholesale channels.

Significant or Unusual Items Impacting Net Earnings

In addition to the impacts of changes in production volumes and business environment, net earnings over the last eight quarters were affected by the following events or one-time adjustments:

•: In the third quarter of 2017, the company recognized a non-cash after-tax gain on forward interest rate swaps of $10 million in the Corporate segment due to an increase in long-term interest rates; the non-cash after-tax loss on forward interest rate swaps due to a decline in long-term interest rates was $22 million in the third quarter of 2016.
•: The company recognized a non-cash after-tax loss on forward interest rate swaps and foreign currency derivatives in the Corporate segment of $32 million in the second quarter of 2017 due to a decrease in long-term interest rates and changes in foreign exchange rates.
•: In the second quarter of 2017, the company incurred an after-tax charge of $10 million in the Corporate segment for early payment of long-term debt, net of associated realized foreign currency hedge gains.
•: In the first quarter of 2017, the company recorded an after-tax gain of $354 million on the sale of the company's lubricants business in the R&M segment, as well as an after-tax gain of $83 million on the divestment of the company's interest in the Cedar Point wind facility in the Corporate segment.
•: During the fourth quarter of 2016, the company recorded after-tax derecognition charges of $40 million on certain upgrading and logistics assets in the Oil Sands segment, as well as $31 million in the Corporate segment relating to an initial investment in an undeveloped pipeline and on certain renewable energy development assets as a result of the uncertainty of future benefits from these assets.
•: In the third quarter of 2016, the U.K. government enacted a decrease in the supplementary charge rate on oil and gas profits in the North Sea that reduced the statutory tax rate on Suncor's earnings in the U.K. from 50% to 40%, effective January 1, 2016. The company revalued its deferred income tax balances, resulting in a deferred income tax recovery of $180 million in the E&P segment.
•: In the second quarter of 2016, the company incurred a non-cash after-tax charge of $73 million in the Corporate segment for early payment of long-term debt acquired as part of the COS acquisition.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 31

•: In the second quarter of 2016, the company recognized a non-cash after-tax mark to market loss on forward interest rate derivatives of $70 million in the Corporate segment due to the decline in long-term interest rates.
•: The company recognized a non-cash after-tax loss on forward interest rate derivatives in the Corporate segment of $90 million in the first quarter of 2016 due to a decrease in long-term interest rates.
•: In the first quarter of 2016, the company incurred $38 million in after-tax charges associated with the acquisition and integration of COS in the Corporate segment.
•: In the fourth quarter of 2015, the company recorded after-tax impairment charges against property, plant and equipment and exploration and evaluation assets of $359 million on White Rose, $331 million on Golden Eagle and $54 million on Terra Nova as a result of impacts of a decline in the crude oil price forecast. In addition, impairment charges of $290 million were recorded on the company's interest in the Joslyn mining project and $54 million on the Ballicatters well, due to uncertainty in the timing and likelihood of development plans, and $96 million in Oil Sands following a review of certain assets that no longer fit with Suncor's growth strategies and which could not be repurposed or otherwise deployed.
•: In the fourth quarter of 2015, as a result of shut-in production due to the continued closure of certain Libyan export terminals, escalating political unrest, and increased uncertainty with respect to the company's return to normal operations in the country, the company recorded an after-tax impairment charge of $415 million against property, plant and equipment and exploration and evaluation assets.

8. OTHER ITEMS

Accounting Policies

Suncor's significant accounting policies and a summary of recently announced accounting standards are described in the Accounting Policies and Critical Accounting Estimates section of Suncor's 2016 annual MD&A.

Critical Accounting Estimates

The preparation of financial statements in accordance with GAAP requires management to make estimates, judgments and assumptions that affect reported assets, liabilities, revenues and expenses, gains and losses, and disclosures of contingencies. These estimates and assumptions are subject to change based on experience and new information. Critical accounting estimates are those that require management to make assumptions about matters that are highly uncertain at the time the estimate is made. Critical accounting estimates are also those estimates which, where a different estimate could have been used or where changes in the estimate that are reasonably likely to occur, would have a material impact on the company's financial condition, changes in financial condition or financial performance. Critical accounting estimates and judgments are reviewed annually by the Audit Committee of the Board of Directors. A detailed description of Suncor's critical accounting estimates is provided in note 4 to the audited Consolidated Financial Statements for the year ended December 31, 2016 and in the Accounting Policies and Critical Accounting Estimates section of Suncor's 2016 annual MD&A.

Financial Instruments

Suncor periodically enters into derivative contracts such as forwards, futures, swaps, options and costless collars to manage exposure to fluctuations in commodity prices and foreign exchange rates, and to optimize the company's position with respect to interest payments. The company also uses physical and financial energy derivatives to earn trading profits. For more information on Suncor's financial instruments and the related financial risk factors, see note 28 of the audited Consolidated Financial Statements for the year ended December 31, 2016, note 11 to the unaudited interim Consolidated Financial Statements for the three months ended September 30, 2017, and the Financial Condition and Liquidity section of Suncor's 2016 annual MD&A.

Income Tax

In the fourth quarter of 2016, the Government of Quebec enacted a decrease in the corporate income tax rate from 11.9% to 11.5% evenly over the next four years, effective January 1, 2017. As a result, the company revalued its deferred income tax balances, resulting in a deferred income tax recovery of $10 million.

32 SUNCOR ENERGY INC. 2017 THIRD QUARTER

In the third quarter of 2016, the U.K. government enacted a decrease in the supplementary charge rate on oil and gas profits in the North Sea that reduced the statutory tax rate on Suncor's earnings in the U.K. from 50% to 40%. The company revalued its deferred income tax balances, resulting in a one-time decrease to deferred income taxes of $180 million in the E&P segment.

Control Environment

Based on their evaluation as at September 30, 2017, Suncor's Chief Executive Officer and Chief Financial Officer concluded that the company's disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the United States Securities Exchange Act of 1934, as amended (the Exchange Act)), are effective to ensure that information required to be disclosed by the company in reports that are filed or submitted to Canadian and U.S. securities authorities is recorded, processed, summarized and reported within the time periods specified in Canadian and U.S. securities laws. In addition, as at September 30, 2017, there were no changes in the internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) that occurred during the three- and nine-month periods ended September 30, 2017 that have materially affected, or are reasonably likely to materially affect, the company's internal control over financial reporting. Management will continue to periodically evaluate the company's disclosure controls and procedures and internal control over financial reporting and will make any modifications from time to time as deemed necessary.

Based on their inherent limitations, disclosure controls and procedures and internal control over financial reporting may not prevent or detect misstatements, and even those controls determined to be effective can provide only reasonable assurance with respect to financial statement preparation and presentation.

Corporate Guidance

Suncor has updated its previously issued 2017 corporate guidance, as set forth in Suncor's press release dated October 25, 2017, which is also available on www.sedar.com.

9. NON-GAAP FINANCIAL MEASURES ADVISORY

Certain financial measures in this MD&A – namely operating earnings (loss), ROCE, funds from (used in) operations, discretionary free cash flow, Oil Sands operations cash operating costs, Syncrude cash operating costs, refining margin, refining operating expense and LIFO – are not prescribed by GAAP. These non-GAAP financial measures are included because management uses the information to analyze business performance, leverage and liquidity, and it may be useful to investors on the same basis. These non-GAAP financial measures do not have any standardized meaning and, therefore, are unlikely to be comparable to similar measures presented by other companies. Therefore, these non-GAAP financial measures should not be considered in isolation or as a substitute for measures of performance prepared in accordance with GAAP. Except as otherwise indicated, these non-GAAP financial measures are calculated and disclosed on a consistent basis from period to period. Specific adjusting items may only be relevant in certain periods.

Operating Earnings (Loss)

Operating earnings (loss) is a non-GAAP financial measure that adjusts net earnings (loss) for significant items that are not indicative of operating performance. Management uses operating earnings (loss) to evaluate operating performance because management believes it provides better comparability between periods. Operating earnings (loss) are reconciled to net earnings (loss) in the Consolidated Financial Information and Segment Results and Analysis sections of this MD&A.

Bridge Analyses of Operating Earnings

Throughout this MD&A, the company presents charts that illustrate the change in operating earnings from the comparative period through key variance factors. These factors are analyzed in the Operating Earnings narratives following the bridge analyses in particular sections of this MD&A. These bridge analyses are presented because management uses this presentation to evaluate performance.

•: The factor for Sales Volumes and Mix is calculated based on sales volumes and mix for the Oil Sands and E&P segments and throughput volumes and mix for the R&M segment.
•: The factor for Price, Margin and Other Revenue includes upstream price realizations before royalties, with the exception of Libya, which is net of royalties. Also included are refining and marketing margins, other operating

SUNCOR ENERGY INC. 2017 THIRD QUARTER 33

revenue, and the net impacts of sales and purchases of third-party crude, including product purchased for use as diluent in the company's Oil Sands operations and subsequently sold as part of diluted bitumen.

•: The factor for Royalties excludes the impact of Libya.
•: The factor for Operating and Transportation Expense includes project start-up costs, operating, selling and general expense, and transportation expense.
•: The factor for Financing Expense and Other includes financing expenses, other income, operational foreign exchange gains and losses, changes in gains and losses on disposal of assets that are not operating earnings adjustments, changes in statutory income tax rates, other income tax adjustments and the net impact of the sale of the lubricants business in the first quarter of 2017.

Return on Capital Employed (ROCE)

ROCE is a non-GAAP financial measure that management uses to analyze operating performance and the efficiency of Suncor's capital allocation process. Average capital employed is calculated as a twelve-month average of the capital employed balance at the beginning of the twelve-month period and the month-end capital employed balances throughout the remainder of the twelve-month period. Figures for capital employed at the beginning and end of the twelve-month period are presented to show the changes in the components of the calculation over the twelve-month period.

The company presents two ROCE calculations – one including and one excluding the impacts on capital employed of major projects in progress. Major projects in progress includes accumulated capital expenditures and capitalized interest for significant projects still under construction or in the process of being commissioned, and acquired assets that are still being evaluated. Management uses ROCE excluding the impacts of major projects in progress on capital employed to assess performance of operating assets.


For the twelve months ended September 30 ($ millions, except as noted)		2017		2016

Adjustments to net earnings

Net earnings (loss)		3 607		(2 103	)

Add after-tax amounts for:

Unrealized foreign exchange (gain) loss on U.S. dollar denominated debt		(568	)	(362	)

Net interest expense		181		306

	A	3 220		(2 159	)

Capital employed – beginning of twelve-month period

Net debt		14 729		9 551

Shareholders' equity		43 976		41 148

		58 705		50 699

Capital employed – end of twelve-month period

Net debt		13 090		14 729

Shareholders' equity		45 378		43 976

		58 468		58 705

Average capital employed	B	58 726		56 010

ROCE – including major projects in progress (%)	A/B	5.5		(3.9	)

Average capitalized costs related to major projects in progress	C	12 778		9 351

ROCE – excluding major projects in progress (%)	A/(B–C)	7.0		(4.6	)

34 SUNCOR ENERGY INC. 2017 THIRD QUARTER

Funds From (Used In) Operations

Funds from (used in) operations is a non-GAAP financial measure that adjusts a GAAP measure – cash flow provided by (used in) operating activities – for changes in non-cash working capital, which management uses to analyze operating performance and liquidity. Changes to non-cash working capital can include, among other factors, the timing of offshore feedstock purchases and payments for commodity and income taxes, and the timing of cash flows related to accounts receivable and accounts payable, which management believes reduces comparability between periods.

Funds from (used in) operations in this MD&A for the twelve-month ended periods are the sum of the funds from (used in) operations for the particular quarter ended September 30 and each of the three preceding quarters. Funds from (used in) operations for each quarter are separately defined and reconciled to the consolidated GAAP measure in the Non-GAAP Financial Measures Advisory section of each respective MD&A for the applicable quarter.


Three months ended September 30	Oil Sands				Exploration and Production				Refining and Marketing				Corporate, Energy Trading and Eliminations				Total
($ millions)	2017		2016		2017		2016		2017		2016		2017		2016		2017		2016

Net earnings (loss)	314		162		161		144		597		436		217		(350	)	1 289		392

Adjustments for:

Depreciation, depletion, amortization and impairment	859		971		236		270		161		164		25		34		1 281		1 439

Deferred income taxes	53		62		(21	)	(198	)	36		(8	)	102		7		170		(137	)

Accretion	48		54		12		11		2		1		—		1		62		67

Unrealized foreign exchange (gain) loss on U.S. dollar denominated debt	—		—		—		—		—		—		(441	)	121		(441	)	121

Change in fair value of financial instruments and trading inventory	8		6		—		—		13		5		24		(16	)	45		(5	)

Gain on disposal of assets	(3	)	—		—		—		(1	)	(13	)	—		—		(4	)	(13	)

Loss on debt extinguishment	—		—		—		—		—		—		—		—		—		—

Share-based compensation	41		20		5		3		21		11		72		33		139		67

Exploration	—		—		—		139		—		—		—		—		—		139

Settlement of decommissioning and restoration liabilities	(49	)	(43	)	(13	)	—		(4	)	(5	)	—		—		(66	)	(48	)

Other	5		4		(5	)	(4	)	2		4		(5	)	(1	)	(3	)	3

Funds from (used in) operations	1 276		1 236		375		365		827		595		(6	)	(171	)	2 472		2 025

(Increase) Decrease in non-cash working capital	(860	)	(502	)	(272	)	(56	)	1 167		(395	)	405		907		440		(46	)

Cash flow provided by (used in) operating activities	416		734		103		309		1 994		200		399		736		2 912		1 979

SUNCOR ENERGY INC. 2017 THIRD QUARTER 35


Nine months ended September 30	Oil Sands				Exploration and Production				Refining and Marketing				Corporate, Energy Trading and Eliminations				Total
($ millions)	2017		2016		2017		2016		2017		2016		2017		2016		2017		2016

Net earnings (loss)	339		(1 425	)	515		136		1 772		1 366		450		(163	)	3 076		(86	)

Adjustments for:

Depreciation, depletion, amortization and impairment	2 727		2 826		809		1 087		489		506		88		97		4 113		4 516

Deferred income taxes	(11	)	(64	)	(118	)	(462	)	23		15		252		69		146		(442	)

Accretion	146		155		33		43		5		5		—		1		184		204

Unrealized foreign exchange (gain) loss on U.S. dollar denominated debt	—		—		—		—		—		—		(845	)	(771	)	(845	)	(771	)

Change in fair value of financial instruments and trading inventory	—		19		—		—		—		28		112		218		112		265

Gain on disposal of assets	(4	)	(33	)	—		—		(352	)	(14	)	(70	)	—		(426	)	(47	)

Loss on debt extinguishment	—		—		—		—		—		—		25		99		25		99

Share-based compensation	(37	)	(16	)	2		5		(13	)	(11	)	(37	)	(37	)	(85	)	(59	)

Exploration	—		—		41		139		—		—		—		—		41		139

Settlement of decommissioning and restoration liabilities	(229	)	(193	)	(16	)	—		(10	)	(13	)	—		—		(255	)	(206	)

Other	27		28		28		(20	)	(8	)	2		(10	)	1		37		11

Funds from (used in) operations	2 958		1 297		1 294		928		1 906		1 884		(35	)	(486	)	6 123		3 623

Decrease (increase) in non-cash working capital	58		(600	)	(114	)	(96	)	1 067		(195	)	(923	)	157		88		(734	)

Cash flow provided by (used in) operating activities	3 016		697		1 180		832		2 973		1 689		(958	)	(329	)	6 211		2 889

Discretionary Free Cash Flow

Discretionary free cash flow is a non-GAAP financial measure that is calculated by taking funds from operations and subtracting sustaining capital, inclusive of associated capitalized interest, and dividends. Discretionary free cash flow reflects cash available for increasing distributions to shareholders and to fund growth investments. Management uses discretionary free cash flow to measure the capacity of the company to increase returns to shareholders and grow the business.


	Three months ended September 30				Twelve months ended September 30
($ millions)	2017		2016		2017		2016

Funds from operations	2 472		2 025		8 488		4 917

Sustaining capital and dividends	(1 356	)	(1 047	)	(4 729	)	(4 590	)

Discretionary Free Cash Flow	1 116		978		3 759		327

Oil Sands Operations and Syncrude Cash Operating Costs

Oil Sands operations and Syncrude cash operating costs are non-GAAP financial measures. Oil Sands operations cash operating costs are calculated by adjusting Oil Sands segment OS&G expense (a GAAP measure based on sales volumes) for i) costs pertaining to Syncrude operations; ii) non-production costs that management believes do not relate to the production performance of Oil Sands operations, including, but not limited to, share-based compensation adjustments, research and the expense recorded as part of a non-monetary arrangement involving a third-party processor; iii) revenues

36 SUNCOR ENERGY INC. 2017 THIRD QUARTER

associated with excess capacity, including excess power generated and sold that is recorded in operating revenue; iv) project start-up costs; and v) the impacts of changes in inventory levels, such that the company is able to present cost information based on production volumes. Syncrude cash operating costs are calculated by adjusting Syncrude OS&G for non-production costs that management believes do not relate to the production performance of Syncrude operations, including, but not limited to, share-based compensation, research and project start-up costs. Oil Sands operations and Syncrude cash operating costs are reconciled in the Segment Results and Analysis – Oil Sands section of this MD&A. Management uses Oil Sands operations and Syncrude cash operating costs to measure Oil Sands operating performance.

Refining Margin and Refining Operating Expense

Refining margin and refining operating expense are non-GAAP financial measures. Refining margin is calculated by adjusting R&M segment operating revenue, other income and purchases of crude oil and products (GAAP measures) for non-refining margin pertaining to the company's supply, marketing and ethanol businesses, and the company's former lubricants business. Refinery operating expense is calculated by adjusting R&M segment OS&G for i) non-refining costs pertaining to the company's supply, marketing and ethanol businesses, and the company's former lubricants business; and ii) non-refining costs that management believes do not relate to the production of refined products, including, but not limited to, share-based compensation and enterprise shared service allocations. Management uses refining margin and refining operating expense to measure operating performance on a production barrel basis.


	Three months ended September 30				Nine months ended September 30
($ millions, except as noted)	2017		2016		2017		2016

Refining margin reconciliation

Gross margin, operating revenue less purchases of crude oil and products	1 520		1 377		4 081		4 233

Other income	48		13		86		26

Non-refining margin	(463	)	(572	)	(1 333	)	(1 811	)

Refining margin	1 105		818		2 834		2 448

Refinery production⁽¹⁾ (mbbls)	46 491		46 119		130 660		126 288

Refining margin ($/bbl)	23.80		17.75		21.70		19.40

Refining operating expense reconciliation

Operating, selling and general expense	481		549		1 462		1 617

Non-refining costs	(272	)	(339	)	(809	)	(988	)

Refining operating expense	209		210		653		629

Refinery production⁽¹⁾ (mbbls)	46 491		46 119		130 660		126 288

Refining operating expense ($/bbl)	4.50		4.55		5.00		5.00

(1): Refinery production is the output of the refining process, and differs from crude oil processed as a result of volumetric adjustments for non-crude feedstock, volumetric gain associated with the refining process, and changes in unfinished product inventories.

Impact of First-in, First-out Inventory Valuation on Refining and Marketing Net Earnings

GAAP requires the use of a FIFO inventory valuation methodology. For Suncor, this results in a disconnect between the sales prices for refined products, which reflect current market conditions, and the amount recorded as the cost of sale for the related refinery feedstock, which reflects market conditions at the time the feedstock was purchased. This lag between purchase and sale can be anywhere from several weeks to several months, and is influenced by the time to receive crude after purchase (which can be several weeks for foreign offshore crude purchases), regional crude inventory levels, the completion of refining processes, transportation time to distribution channels, and regional refined product inventory levels.

Suncor prepares and presents an estimate of the impact of using a FIFO inventory valuation methodology compared to a LIFO methodology, because management uses the information to analyze operating performance and compare itself against refining peers that are permitted to use LIFO inventory valuation under United States GAAP (U.S. GAAP).

SUNCOR ENERGY INC. 2017 THIRD QUARTER 37

The company's estimate is not derived from a standardized calculation and, therefore, may not be directly comparable to similar measures presented by other companies, and should not be considered in isolation or as a substitute for measures of performance prepared in accordance with GAAP or U.S. GAAP.

10. COMMON ABBREVIATIONS

The following is a list of abbreviations that may be used in this MD&A:


Measurement		Places and Currencies
bbl	barrel	U.S.	United States
bbls/d	barrels per day	U.K.	United Kingdom
mbbls/d	thousands of barrels per day
		$ or Cdn$	Canadian dollars
boe	barrels of oil equivalent	US$	United States dollars
boe/d	barrels of oil equivalent per day
mboe	thousands of barrels of oil equivalent
mboe/d	thousands of barrels of oil equivalent per day	Financial and Business Environment
		Q3	Three months ended September 30
GJ	Gigajoule	DD&A	Depreciation, depletion and amortization
		WTI	West Texas Intermediate
mcf	thousands of cubic feet of natural gas	WCS	Western Canadian Select
mcfe	thousands of cubic feet of natural gas equivalent	SCO	Synthetic crude oil
mmcf	millions of cubic feet of natural gas	MSW	Mixed Sweet Blend
mmcf/d	millions of cubic feet of natural gas per day	NYMEX	New York Mercantile Exchange
mmcfe	millions of cubic feet of natural gas equivalent	YTD	Year to date
mmcfe/d	millions of cubic feet of natural gas equivalent
	per day
MW	megawatts
MWh	megawatts per hour

38 SUNCOR ENERGY INC. 2017 THIRD QUARTER

11. FORWARD-LOOKING INFORMATION

The document contains certain forward-looking information and forward-looking statements (collectively referred to herein as "forward-looking statements") within the meaning of applicable Canadian and U.S. securities laws. Forward-looking statements and other information are based on Suncor's current expectations, estimates, projections and assumptions that were made by the company in light of information available at the time the statement was made and consider Suncor's experience and its perception of historical trends, including expectations and assumptions concerning: the accuracy of reserves and resources estimates; commodity prices and interest and foreign exchange rates; the performance of assets and equipment; capital efficiencies and cost-savings; applicable laws and government policies, including royalty rates and tax laws; future production rates; the sufficiency of budgeted capital expenditures in carrying out planned activities; the availability and cost of labour and services; the satisfaction by third parties of their obligations to Suncor; and the receipt, in a timely manner, of regulatory and third-party approvals. In addition, all other statements and other information that address expectations or projections about the future, and other statements and information about Suncor's strategy for growth, expected and future expenditures or investment decisions, commodity prices, costs, schedules, production volumes, operating and financial results, future financing and capital activities, and the expected impact of future commitments are forward-looking statements. Some of the forward-looking statements may be identified by words like "expects", "anticipates", "will", "estimates", "plans", "scheduled", "intends", "believes", "projects", "indicates", "could", "focus", "vision", "goal", "outlook", "proposed", "target", "objective", "continue", "should", "may", "future", "potential", "opportunity", "would" and similar expressions. Forward-looking statements in the document include references to:

•: Suncor's growth projects, including: (i) statements around the Fort Hills project, including that the project remains on track for expected first oil at the end of 2017; planned ramp up through 2018 and the expectation that the successful test of the front end of the plant as part of the commissioning phase significantly de-risks the planned ramp up; that early-works sustaining activities will support the execution of the Fort Hills mine and tailings plan following the commencement of production, and expectations for the East Tank Farm Development; and (ii) statements around the Hebron project, including that first oil remains on track for the end of 2017;
•: Estimated proceeds of approximately $500 million from the sale of a combined 49% interest in the East Tank Farm Development to the Fort McKay and Mikisew Cree First Nations and the expectation that the arrangement will close in the fourth quarter of 2017;
•: The expectation that Suncor will receive some insurance proceeds as early as the fourth quarter of 2017 associated with the Syncrude facility incident;
•: Efforts with Syncrude to drive operating efficiencies, improve performance and develop regional synergies through integration;
•: The expectation that the disciplined execution of Suncor's 2017 capital program will focus on bringing Suncor's major growth projects, Fort Hills and Hebron, to first oil by the end of the year, while continuing to invest in the safety, reliability and efficiency of the company's operating assets;
•: The anticipated impact and timing of planned maintenance events, including planned upgrader maintenance and planned maintenance at MacKay River;
•: Suncor's expectation that existing production levels at Firebag and MacKay River will be maintained due to ongoing well pad construction;
•: The belief that Suncor will have the capital resources to fund its planned 2017 capital spending program of $5.4 to $5.6 billion and to meet current and future working capital requirements, including $1.449 billion of long-term debt due in the second quarter of 2018, through cash balances and cash equivalents, cash flow provided by operating activities, available committed credit facilities, issuing commercial paper, divesting of non-core assets and accessing capital markets;
•: The objectives of Suncor's short-term investment portfolio and Suncor's expectation that the maximum weighted average term to maturity of the short-term investment portfolio will not exceed six months, and that all investments will be with counterparties with investment grade debt ratings;
•: The expectation that, as capital spending on major growth projects starts to ramp down, less cash will be required for funding purposes in the future, supporting the repayment of long-term debt and increased returns to shareholders, subject to prevailing economic conditions and other factors;

SUNCOR ENERGY INC. 2017 THIRD QUARTER 39

•: Suncor's expectation that the cancelled credit facility that was acquired through the acquisition of COS will no longer be required for liquidity purposes and the termination will reduce future financing expense;
•: The expectation that the repayment of notes during the second quarter of 2017 will reduce financing costs and provide ongoing balance sheet flexibility;
•: Suncor's belief that a phased and flexible approach to existing and future growth projects should assist Suncor in its ability to manage project costs and debt levels;
•: Suncor's business environment outlook assumptions for Brent Sollum Voe, WTI at Cushing, WCS at Hardisty and New York Harbor 3-2-1, and full year current income tax assumptions; and
•: The company's belief that it does not have any guarantees or off-balance sheet arrangements that have, or are reasonably likely to have, a current or future material effect on the company's financial performance or financial condition, results of operations, liquidity or capital expenditures.

Forward-looking statements are not guarantees of future performance and involve a number of risks and uncertainties, some that are similar to other oil and gas companies and some that are unique to Suncor. Suncor's actual results may differ materially from those expressed or implied by its forward-looking statements, so readers are cautioned not to place undue reliance on them. The financial and operating performance of the company's reportable operating segments, specifically Oil Sands, E&P, and R&M, may be affected by a number of factors.

Factors that affect our Oil Sands segment include, but are not limited to, volatility in the prices for crude oil and other production, and the related impacts of fluctuating light/heavy and sweet/sour crude oil differentials; changes in the demand for refinery feedstock and diesel fuel, including the possibility that refiners that process our proprietary production will be closed, experience equipment failure or other accidents; our ability to operate our Oil Sands facilities reliably in order to meet production targets; the output of newly commissioned facilities, the performance of which may be difficult to predict during initial operations; the possibility that completed maintenance activities may not improve operational performance or the output of related facilities; our dependence on pipeline capacity and other logistical constraints, which may affect our ability to distribute our products to market; our ability to finance Oil Sands growth and sustaining capital expenditures; the availability of bitumen feedstock for upgrading operations, which can be negatively affected by poor ore grade quality, unplanned mine equipment and extraction plant maintenance, tailings storage, and in situ reservoir and equipment performance, or the unavailability of third-party bitumen; inflationary pressures on operating costs, including labour, natural gas and other energy sources used in oil sands processes; our ability to complete projects, including planned maintenance events, both on time and on budget, which could be impacted by competition from other projects (including other oil sands projects) for goods and services and demands on infrastructure in Alberta's Wood Buffalo region and the surrounding area (including housing, roads and schools); risks and uncertainties associated with obtaining regulatory and stakeholder approval for exploration and development activities; changes to royalty and tax legislation and related agreements that could impact our business; the potential for disruptions to operations and construction projects as a result of our relationships with labour unions that represent employees at our facilities; and changes to environmental regulations or legislation.

Factors that affect our E&P segment include, but are not limited to, volatility in crude oil and natural gas prices; operational risks and uncertainties associated with oil and gas activities, including unexpected formations or pressures, premature declines of reservoirs, fires, blow-outs, equipment failures and other accidents, uncontrollable flows of crude oil, natural gas or well fluids, and pollution and other environmental risks; the possibility that completed maintenance activities may not improve operational performance or the output of related facilities; adverse weather conditions, which could disrupt output from producing assets or impact drilling programs, resulting in increased costs and/or delays in bringing on new production; political, economic and socio-economic risks associated with Suncor's foreign operations, including the unpredictability of operating in Libya due to ongoing political unrest and that operations in Syria continue to be impacted by sanctions and political unrest; risks and uncertainties associated with obtaining regulatory and stakeholder approval for exploration and development activities; the potential for disruptions to operations and construction projects as a result of our relationships with labour unions that represent employees at our facilities; and market demand for mineral rights and producing properties, potentially leading to losses on disposition or increased property acquisition costs.

Factors that affect our R&M segment include, but are not limited to, fluctuations in demand and supply for refined products that impact the company's margins; market competition, including potential new market entrants; our ability to reliably operate refining and marketing facilities in order to meet production or sales targets; the possibility that completed maintenance activities may not improve operational performance or the output of related facilities; risks and uncertainties affecting construction or planned maintenance schedules, including the availability of labour and other

40 SUNCOR ENERGY INC. 2017 THIRD QUARTER

impacts of competing projects drawing on the same resources during the same time period; and the potential for disruptions to operations and construction projects as a result of our relationships with labour unions or employee associations that represent employees at our refineries and distribution facilities.

Additional risks, uncertainties and other factors that could influence the financial and operating performance of all of Suncor's operating segments and activities include, but are not limited to, changes in general economic, market and business conditions, such as commodity prices, interest rates and currency exchange rates; fluctuations in supply and demand for Suncor's products; the successful and timely implementation of capital projects, including growth projects and regulatory projects; competitive actions of other companies, including increased competition from other oil and gas companies or from companies that provide alternative sources of energy; labour and material shortages; actions by government authorities, including the imposition or reassessment of, or changes to, taxes, fees, royalties, duties and other government-imposed compliance costs; changes in environmental and other regulations and policies; the ability and willingness of parties with whom we have material relationships to perform their obligations to us; outages to third-party infrastructure that could cause disruptions to production; the occurrence of unexpected events such as fires (including forest fires), equipment failures and other similar events affecting Suncor or other parties whose operations or assets directly or indirectly affect Suncor; the potential for security breaches of Suncor's information technology and infrastructure by computer hackers or cyberterrorists, and the unavailability or failure of such systems to perform as anticipated as a result of such breaches; our ability to find new oil and gas reserves that can be developed economically; the accuracy of Suncor's reserves, resources and future production estimates; market instability affecting Suncor's ability to borrow in the capital debt markets at acceptable rates; maintaining an optimal debt to cash flow ratio; the success of the company's risk management activities using derivatives and other financial instruments; the cost of compliance with current and future environmental laws, including climate change laws; risks and uncertainties associated with closing a transaction for the purchase or sale of a business, asset, or oil and gas property, including estimates of the final consideration to be paid or received, the ability of counterparties to comply with their obligations in a timely manner and the receipt of any required regulatory or other third-party approvals outside of Suncor's control; risks associated with land claims and Aboriginal consultation requirements; risks relating to litigation; and the accuracy of cost estimates, some of which are provided at the conceptual or other preliminary stage of projects and prior to commencement or conception of the detailed engineering that is needed to reduce the margin of error and increase the level of accuracy. The foregoing important factors are not exhaustive.

Many of these risk factors and other assumptions related to Suncor's forward-looking statements are discussed in further detail throughout this MD&A, and in the company's 2016 annual MD&A, 2016 AIF and Form 40-F on file with Canadian securities commissions at www.sedar.com and the United States Securities and Exchange Commission at www.sec.gov. Readers are also referred to the risk factors and assumptions described in other documents that Suncor files from time to time with securities regulatory authorities. Copies of these documents are available without charge from the company.

The forward-looking statements contained in this MD&A are made as of the date of this MD&A. Except as required by applicable securities laws, we assume no obligation to update publicly or otherwise revise any forward-looking statements or the foregoing risks and assumptions affecting such forward-looking statements, whether as a result of new information, future events or otherwise.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 41

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
(unaudited)


	Three months ended September 30				Nine months ended September 30
($ millions)	2017		2016		2017		2016

Revenues and Other Income

Operating revenues, net of royalties (note 3)	7 986		7 409		23 051		18 967

Other income (loss) (note 4)	43		(15	)	84		(140	)

	8 029		7 394		23 135		18 827

Expenses

Purchases of crude oil and products	2 875		2 734		8 348		7 475

Operating, selling and general	2 264		2 212		6 810		6 614

Transportation	247		262		781		793

Depreciation, depletion, amortization and impairment	1 281		1 439		4 113		4 516

Exploration	13		146		78		203

Gain on disposal of assets (notes 13 and 14)	(5	)	(13	)	(555	)	(47	)

Financing (income) expenses (note 7)	(323	)	288		(471	)	(87	)

	6 352		7 068		19 104		19 467

Earnings (Loss) before Income Taxes	1 677		326		4 031		(640	)

Income Taxes – Expense (Recovery) (note 8)

Current	218		71		809		(112	)

Deferred	170		(137	)	146		(442	)

	388		(66	)	955		(554	)

Net Earnings (Loss)	1 289		392		3 076		(86	)

Net Earnings (Loss) Attributable to:

Common shareholders	1 289		392		3 076		(97	)

Non-controlling interest	—		—		—		11

	1 289		392		3 076		(86	)

Other Comprehensive (Loss) Income

Items that may be subsequently reclassified to earnings

Foreign currency translation adjustment	(100	)	36		(206	)	(294	)

Items that will not be reclassified to earnings

Actuarial gain (loss) on employee retirement benefit plans, net of income taxes	52		(434	)	53		(474	)

Other Comprehensive Loss	(48	)	(398	)	(153	)	(768	)

Total Comprehensive Income (Loss)	1 241		(6	)	2 923		(854	)

Per Common Share (dollars) (note 9)

Net earnings (loss) – basic	0.78		0.24		1.85		(0.05	)

Net earnings (loss) – diluted	0.78		0.24		1.84		(0.05	)

Net earnings (loss) – attributable to common shareholders – basic	0.78		0.24		1.85		(0.06	)

Net earnings (loss) – attributable to common shareholders – diluted	0.78		0.24		1.84		(0.06	)

Cash dividends	0.32		0.29		0.96		0.87

See accompanying notes to the interim consolidated financial statements.

42 SUNCOR ENERGY INC. 2017 THIRD QUARTER

CONSOLIDATED BALANCE SHEETS
(unaudited)


($ millions)	September 30 2017	December 31 2016

Assets

Current assets

Cash and cash equivalents	2 757	3 016

Accounts receivable	3 598	3 182

Inventories	3 049	3 240

Income taxes receivable	157	376

Assets held for sale (notes 13 and 14)	—	1 205

Total current assets	9 561	11 019

Property, plant and equipment, net	72 026	71 259

Exploration and evaluation	2 043	2 038

Other assets	1 165	1 248

Goodwill and other intangible assets	3 062	3 075

Deferred income taxes	88	63

Total assets	87 945	88 702

Liabilities and Shareholders' Equity

Current liabilities

Short-term debt	2 060	1 273

Current portion of long-term debt	1 509	54

Accounts payable and accrued liabilities	5 872	5 588

Current portion of provisions	690	781

Income taxes payable	366	224

Liabilities associated with assets held for sale (notes 13 and 14)	—	197

Total current liabilities	10 497	8 117

Long-term debt	12 278	16 103

Other long-term liabilities	1 897	2 067

Provisions (note 12)	6 485	6 542

Deferred income taxes	11 410	11 243

Equity	45 378	44 630

Total liabilities and equity	87 945	88 702

See accompanying notes to the interim consolidated financial statements.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 43

CONSOLIDATED STATEMENTS OF CASH FLOWS
(unaudited)


	Three months ended September 30				Nine months ended September 30
($ millions)	2017		2016		2017		2016

Operating Activities

Net earnings (loss)	1 289		392		3 076		(86	)

Adjustments for:

Depreciation, depletion, amortization and impairment	1 281		1 439		4 113		4 516

Deferred income taxes	170		(137	)	146		(442	)

Accretion	62		67		184		204

Unrealized foreign exchange (gain) loss on U.S. dollar denominated debt	(441	)	121		(845	)	(771	)

Change in fair value of financial instruments and trading inventory	45		(5	)	112		265

Gain on disposal of assets (notes 13 and 14)	(4	)	(13	)	(426	)	(47	)

Loss on extinguishment of long-term debt (note 7)	—		—		25		99

Share-based compensation	139		67		(85	)	(59	)

Exploration	—		139		41		139

Settlement of decommissioning and restoration liabilities	(66	)	(48	)	(255	)	(206	)

Other	(3	)	3		37		11

Decrease (increase) in non-cash working capital	440		(46	)	88		(734	)

Cash flow provided by operating activities	2 912		1 979		6 211		2 889

Investing Activities

Capital and exploration expenditures	(1 695	)	(1 693	)	(4 930	)	(5 010	)

Cash acquired from Canadian Oil Sands Limited	—		—		—		109

Acquisitions	—		—		—		(946	)

Proceeds from disposal of assets	54		4		1 531		196

Other investments	(15	)	(4	)	(14	)	(11	)

(Increase) decrease in non-cash working capital	(109	)	122		(72	)	(45	)

Cash flow used in investing activities	(1 765	)	(1 571	)	(3 485	)	(5 707	)

Financing Activities

Net change in short-term debt	98		(705	)	925		1 250

Net change in long-term debt	(14	)	(137	)	(1 768	)	(1 679	)

Issuance of long-term debt (note 7)	—		993		—		993

Issuance of common shares under share option plans	29		5		105		17

(Purchase) issuance of common shares (notes 6 and 10)	(282	)	—		(578	)	2 782

Dividends paid on common shares	(531	)	(483	)	(1 598	)	(1 394	)

Cash flow (used in) provided by financing activities	(700	)	(327	)	(2 914	)	1 969

Increase (Decrease) in Cash and Cash Equivalents	447		81		(188	)	(849	)

Effect of foreign exchange on cash and cash equivalents	(42	)	13		(71	)	(98	)

Cash and cash equivalents at beginning of period	2 352		3 008		3 016		4 049

Cash and Cash Equivalents at End of Period	2 757		3 102		2 757		3 102

Supplementary Cash Flow Information

Interest paid	111		86		609		597

Income taxes paid (received)	155		(46	)	274		(56	)

See accompanying notes to the interim consolidated financial statements.

44 SUNCOR ENERGY INC. 2017 THIRD QUARTER

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY
(unaudited)


($ millions)	Share Capital		Contributed Surplus		Accumulated Other Comprehensive Income		Non- controlling Interest		Retained Earnings		Total		Number of Common Shares (thousands)

At December 31, 2015	19 466		633		1 265		—		17 675		39 039		1 446 013

Net earnings (loss)	—		—		—		11		(97	)	(86	)	—

Foreign currency translation adjustment	—		—		(294	)	—		—		(294	)	—

Actuarial loss on employee retirement benefit plans, net of income taxes of $167	—		—		—		—		(474	)	(474	)	—

Total comprehensive (loss) income	—		—		(294	)	11		(571	)	(854	)	—

Issued under share option plans	64		(44	)	—		—		—		20		597

Issued for cash, net of income taxes of $26 (note 10)	2 808		—		—		—		—		2 808		82 225

Issued for the acquisition of Canadian Oil Sands Limited	3 154		—		—		1 172		—		4 326		98 814

Equity transactions to eliminate non-controlling interest in Canadian Oil Sands Limited	1 298		—		—		(1 183	)	(115	)	—		36 879

Share-based compensation	—		31		—		—		—		31		—

Dividends paid on common shares	—		—		—		—		(1 394	)	(1 394	)	—

At September 30, 2016	26 790		620		971		—		15 595		43 976		1 664 528

At December 31, 2016	26 942		588		1 007		—		16 093		44 630		1 667 914

Net earnings	—		—		—		—		3 076		3 076		—

Foreign currency translation adjustment	—		—		(206	)	—		—		(206	)	—

Actuarial gain on employee retirement benefit plans, net of income taxes of $20	—		—		—		—		53		53		—

Total comprehensive (loss) income	—		—		(206	)	—		3 129		2 923		—

Issued under share option plans	134		(30	)	—		—		—		104		2 982

Purchase of common shares for cancellation (note 6)	(233	)	—		—		—		(345	)	(578	)	(14 441	)

Change in liability for share purchase commitment (note 6)	(53	)	—		—		—		(91	)	(144	)	—

Share-based compensation	—		41		—		—		—		41		—

Dividends paid on common shares	—		—		—		—		(1 598	)	(1 598	)	—

At September 30, 2017	26 790		599		801		—		17 188		45 378		1 656 455

See accompanying notes to the interim consolidated financial statements.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 45

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS
(unaudited)

1. REPORTING ENTITY AND DESCRIPTION OF THE BUSINESS

Suncor Energy Inc. (Suncor or the company) is an integrated energy company headquartered in Canada. Suncor's operations include oil sands development and upgrading, onshore and offshore oil and gas production, petroleum refining, and product marketing primarily under the Petro-Canada brand. The consolidated financial statements of the company comprise the company and its subsidiaries and the company's interests in associates and joint arrangements.

The address of the company's registered office is 150 – 6th Avenue S.W., Calgary, Alberta, Canada, T2P 3E3.

2. BASIS OF PREPARATION

(a) Statement of Compliance

These condensed interim consolidated financial statements have been prepared in accordance with International Financial Reporting Standards (IFRS), specifically International Accounting Standard (IAS) 34Interim Financial Reporting as issued by the International Accounting Standards Board. They are condensed as they do not include all of the information required for full annual financial statements, and they should be read in conjunction with the consolidated financial statements for the year ended December 31, 2016.

The policies applied in these condensed interim consolidated financial statements are based on IFRS issued and outstanding as at October 25, 2017.

(b) Basis of Measurement

The consolidated financial statements are prepared on a historical cost basis except as detailed in the accounting policies disclosed in the company's consolidated financial statements for the year ended December 31, 2016.

(c) Functional Currency and Presentation Currency

These consolidated financial statements are presented in Canadian dollars, which is the company's functional currency.

(d) Use of Estimates and Judgment

The timely preparation of financial statements requires that management make estimates and assumptions and use judgment. Accordingly, actual results may differ from estimated amounts as future confirming events occur. Significant estimates and judgment used in the preparation of the financial statements are described in the company's consolidated financial statements for the year ended December 31, 2016.

(e) Income taxes

The company recognizes the impacts of income tax rate changes in earnings in the period the rate change is substantively enacted.

46 SUNCOR ENERGY INC. 2017 THIRD QUARTER

3. SEGMENTED INFORMATION

The company's operating segments are reported based on the nature of their products and services and management responsibility.

Intersegment sales of crude oil and natural gas are accounted for at market values and are included, for segmented reporting, in revenues of the segment making the transfer and expenses of the segment receiving the transfer. Intersegment amounts are eliminated on consolidation.


Three months ended September 30	Oil Sands				Exploration and Production				Refining and Marketing				Corporate, Energy Trading and Eliminations				Total
($ millions)	2017		2016		2017		2016		2017		2016		2017		2016		2017		2016

Revenues and Other Income

Gross revenues	2 319		2 320		766		462		5 110		4 679		5		12		8 200		7 473

Intersegment revenues	914		647		—		85		30		32		(944	)	(764	)	—		—

Less: Royalties	(82	)	(20	)	(132	)	(44	)	—		—		—		—		(214	)	(64	)

Operating revenues, net of royalties	3 151		2 947		634		503		5 140		4 711		(939	)	(752	)	7 986		7 409

Other (loss) income	(6	)	3		1		7		48		13		—		(38	)	43		(15	)

	3 145		2 950		635		510		5 188		4 724		(939	)	(790	)	8 029		7 394

Expenses

Purchases of crude oil and products	135		135		—		—		3 620		3 334		(880	)	(735	)	2 875		2 734

Operating, selling and general	1 513		1 420		109		107		481		549		161		136		2 264		2 212

Transportation	164		159		21		20		76		95		(14	)	(12	)	247		262

Depreciation, depletion, amortization and impairment	859		971		236		270		161		164		25		34		1 281		1 439

Exploration	3		—		10		146		—		—		—		—		13		146

Gain on disposal of assets	(3	)	—		—		—		(2	)	(13	)	—		—		(5	)	(13	)

Financing expenses (income)	40		57		—		12		2		—		(365	)	219		(323	)	288

	2 711		2 742		376		555		4 338		4 129		(1 073	)	(358	)	6 352		7 068

Earnings (Loss) before Income Taxes	434		208		259		(45	)	850		595		134		(432	)	1 677		326

Income Taxes – Expense (Recovery)

Current	67		(16	)	119		9		217		167		(185	)	(89	)	218		71

Deferred	53		62		(21	)	(198	)	36		(8	)	102		7		170		(137	)

	120		46		98		(189	)	253		159		(83	)	(82	)	388		(66	)

Net Earnings (Loss)	314		162		161		144		597		436		217		(350	)	1 289		392

Capital and Exploration Expenditures	1 340		1 306		189		283		159		101		7		3		1 695		1 693

SUNCOR ENERGY INC. 2017 THIRD QUARTER 47


Nine months ended September 30	Oil Sands				Exploration and Production				Refiningand Marketing				Corporate, Energy Trading and Eliminations				Total
($ millions)	2017		2016		2017		2016		2017		2016		2017		2016		2017		2016

Revenues and Other Income

Gross revenues	6 559		4 715		2 538		1 588		14 482		12 796		28		34		23 607		19 133

Intersegment revenues	2 462		1 451		—		114		55		96		(2 517	)	(1 661	)	—		—

Less: Royalties	(180	)	(48	)	(376	)	(118	)	—		—		—		—		(556	)	(166	)

Operating revenues, net of royalties	8 841		6 118		2 162		1 584		14 537		12 892		(2 489	)	(1 627	)	23 051		18 967

Other income (loss)	25		18		(22	)	45		86		26		(5	)	(229	)	84		(140	)

	8 866		6 136		2 140		1 629		14 623		12 918		(2 494	)	(1 856	)	23 135		18 827

Expenses

Purchases of crude oil and products	390		447		—		—		10 456		8 659		(2 498	)	(1 631	)	8 348		7 475

Operating, selling and general	4 641		4 143		321		368		1 462		1 617		386		486		6 810		6 614

Transportation	521		489		66		65		232		271		(38	)	(32	)	781		793

Depreciation, depletion, amortization and impairment	2 727		2 826		809		1 087		489		506		88		97		4 113		4 516

Exploration	9		30		69		173		—		—		—		—		78		203

Gain on disposal of assets	(4	)	(33	)	—		—		(454	)	(14	)	(97	)	—		(555	)	(47	)

Financing expenses (income)	125		176		22		62		12		12		(630	)	(337	)	(471	)	(87	)

	8 409		8 078		1 287		1 755		12 197		11 051		(2 789	)	(1 417	)	19 104		19 467

Earnings (Loss) before Income Taxes	457		(1 942	)	853		(126	)	2 426		1 867		295		(439	)	4 031		(640	)

Income Taxes – Expense (Recovery)

Current	129		(453	)	456		200		631		486		(407	)	(345	)	809		(112	)

Deferred	(11	)	(64	)	(118	)	(462	)	23		15		252		69		146		(442	)

	118		(517	)	338		(262	)	654		501		(155	)	(276	)	955		(554	)

Net Earnings (Loss)	339		(1 425	)	515		136		1 772		1 366		450		(163	)	3 076		(86	)

Capital and Exploration Expenditures	3 899		3 667		631		829		385		502		15		12		4 930		5 010

48 SUNCOR ENERGY INC. 2017 THIRD QUARTER

4. OTHER INCOME (LOSS)

Other income consists of the following:


	Three months ended September 30				Nine months ended September 30
($ millions)	2017		2016		2017		2016

Energy trading activities

Losses recognized in earnings during the period	(38	)	(45	)	(18	)	(63	)

(Losses) gains on inventory valuation	(3	)	31		(46	)	48

Risk management activities⁽¹⁾	(2	)	(23	)	32		(253	)

Investment and interest income	86		8		140		56

Risk mitigation and insurance proceeds⁽²⁾	—		—		—		26

Change in value of pipeline commitments and other	—		14		(24	)	46

	43		(15	)	84		(140	)

(1): Includes fair value changes related to short-term derivative contracts in the Oil Sands and Refining and Marketing segments and long-term forward starting interest rate swaps in the Corporate segment.
(2): Includes property damage insurance proceeds recorded in the second quarter of 2016 for the Terra Nova asset in the Exploration and Production segment.

5. SHARE-BASED COMPENSATION

The following table summarizes the share-based compensation expense recorded for all plans within Operating, Selling and General expense.


	Three months ended September 30		Nine months ended September 30
($ millions)	2017	2016	2017	2016

Equity-settled plans	8	7	41	31

Cash-settled plans	132	61	224	206

	140	68	265	237

6. NORMAL COURSE ISSUER BID

On April 26, 2017, the company announced its intention to commence a new Normal Course Issuer Bid (the 2017 NCIB) to repurchase shares through the facilities of the Toronto Stock Exchange, New York Stock Exchange and/or alternative trading platforms. Pursuant to the 2017 NCIB, the company may purchase for cancellation up to approximately $2.0 billion worth of its common shares between May 2, 2017 and May 1, 2018. During the third quarter of 2017, the company repurchased 7.2 million common shares under the 2017 NCIB at an average price of $39.19 per share, for a total repurchase cost of $282 million.

The following table summarizes the share repurchase activities during the period:


	Three months ended September 30		Nine months ended September 30
($ millions, except as noted)	2017	2016	2017	2016

Share repurchase activities(thousands of common shares)

Shares repurchased	7 220	—	14 441	—

Amounts charged to

Share capital	116	—	233	—

Retained earnings	166	—	345	—

Share repurchase cost	282	—	578	—

SUNCOR ENERGY INC. 2017 THIRD QUARTER 49

Under an automatic repurchase plan agreement with an independent broker, the company has recorded the following liability for share repurchases that may take place during its internal blackout period:


($ millions)	September 30 2017	Dec 31 2016

Amounts charged to

Share capital	53	—

Retained earnings	91	—

Liability for share purchase commitment	144	—

7. FINANCING (INCOME) EXPENSE


	Three months ended September 30				Nine months ended September 30
($ millions)	2017		2016		2017		2016

Interest on debt	218		243		704		753

Capitalized interest	(182	)	(153	)	(552	)	(434	)

Interest expense	36		90		152		319

Interest on pension and other post-retirement benefits	14		18		44		45

Accretion	62		67		184		204

Foreign exchange (gain) loss on U.S. dollar denominated debt	(441	)	121		(845	)	(771	)

Foreign exchange and other	6		(8	)	(31	)	17

Loss on extinguishment of long-term debt	—		—		87		99

Realized gains on foreign currency hedges	—		—		(62	)	—

	(323	)	288		(471	)	(87	)

During the second quarter of 2017, the company completed an early retirement of its US$1.250 billion (book value of $1.700 billion) long-term notes originally scheduled to mature on June 1, 2018 for US$1.344 billion ($1.830 billion), including US$31 million ($42 million) of accrued interest. In conjunction with the early retirement of the notes, the company also realized gains of $62 million on foreign currency hedges resulting in an overall debt extinguishment loss of $25 million ($10 million after-tax).

During the third quarter of 2016, the company issued $700 million of senior unsecured Series 5 Medium Term Notes maturing on September 14, 2026. The notes have a coupon of 3.00% and were priced at $99.751 per note for an effective yield of 3.029%. The company also issued $300 million of senior unsecured Series 5 Medium Term Notes maturing on September 13, 2046. The notes have a coupon of 4.34% and were priced at $99.900 per note for an effective yield of 4.346%.

During the second quarter of 2016, the company purchased US$688 million ($891 million) principal value (book value of $864 million) of subsidiary debt acquired through the acquisition of Canadian Oil Sands Limited (COS) for US$751 million ($973 million) including US$8 million ($10 million) of accrued interest, resulting in a debt extinguishment loss of $99 million ($73 million after-tax). The company also repaid approximately $600 million of the credit facility acquired in the COS transaction.

8. INCOME TAXES

In the third quarter of 2016, the United Kingdom (U.K.) government enacted a decrease in the supplementary charge rate on oil and gas profits in the North Sea that reduced the statutory tax rate on Suncor's earnings in the U.K. from 50% to 40%. The company revalued its deferred income tax balances, resulting in a deferred income tax recovery of $180 million.

50 SUNCOR ENERGY INC. 2017 THIRD QUARTER

9. EARNINGS (LOSS) PER COMMON SHARE


	Three months ended September 30		Nine months ended September 30
($ millions)	2017	2016	2017		2016

Net earnings (loss)	1 289	392	3 076		(86	)

Dilutive impact of accounting for awards as equity-settled⁽¹⁾	—	—	(1	)	—

Net earnings (loss) – diluted	1 289	392	3 075		(86	)

Net earnings (loss) attributable to common shareholders	1 289	392	3 076		(97	)

Dilutive impact of accounting for awards as equity-settled⁽¹⁾	—	—	(1	)	—

Net earnings (loss) – diluted attributable to common shareholders	1 289	392	3 075		(97	)

(millions of common shares)

Weighted average number of common shares	1 659	1 664	1 665		1 591

Dilutive securities:

Effect of share options	3	2	4		1

Weighted average number of diluted common shares	1 662	1 666	1 669		1 592

(dollars per common share)

Basic earnings (loss) per share	0.78	0.24	1.85		(0.05	)

Diluted earnings (loss) per share	0.78	0.24	1.84		(0.05	)

Basic earnings (loss) per share attributable to common shareholders	0.78	0.24	1.85		(0.06	)

Diluted earnings (loss) per share attributable to common shareholders	0.78	0.24	1.84		(0.06	)

(1): Cash payment alternatives are accounted for as cash-settled plans. As these awards can be exchanged for common shares of the company, they are considered potentially dilutive and are included in the calculation of the company's diluted net earnings (loss) per share if they have a dilutive impact in the period. Accounting for these awards as equity-settled was determined to have a dilutive impact for the three and nine months ended September 30, 2017 (anti-dilutive for the three and nine months ended September 30, 2016).

10. SHARE CAPITAL

On June 22, 2016, the company issued 82.2 million common shares for $35.00 per common share. Gross proceeds were approximately $2.878 billion ($2.782 billion net of fees).

11. FINANCIAL INSTRUMENTS

Derivative Financial Instruments

(a) Non-Designated Derivative Financial Instruments

The following table presents the company's non-designated Energy Trading, and Risk Management derivatives measured at fair value as at September 30, 2017:


($ millions)	Energy Trading		Risk Management		Total

Fair value outstanding at December 31, 2016	(36	)	(18	)	(54	)

Cash Settlements – received during the period	(17	)	(63	)	(80	)

(Losses) gains recognized in earnings during the period (note 4)	(18	)	32		14

Fair value outstanding at September 30, 2017	(71	)	(49	)	(120	)

SUNCOR ENERGY INC. 2017 THIRD QUARTER 51

(b) Fair Value Hierarchy

The following table presents the company's financial instruments measured at fair value for each hierarchy level as at September 30, 2017:


($ millions)	Level 1		Level 2		Level 3	Total Fair Value

Accounts receivable	39		56		—	95

Accounts payable	(98	)	(117	)	—	(215	)

	(59	)	(61	)	—	(120	)

During the third quarter of 2017, there were no transfers between Level 1 and Level 2 fair value measurements and no transfers into and out of Level 3 fair value measurements.

The company uses forward starting interest rate swaps to mitigate its exposure to the effect of future interest rate movements on future debt issuances. As at September 30, 2017, the company had $924 million in outstanding forward swaps. An increase in interest rates of 0.04% during the quarter resulted in an increase in value of $14 million associated with the remaining swaps. An increase in interest rates of 0.02% during the nine months ended September 30, 2017 resulted in an increase in value of $5 million associated with the remaining swaps.

Non-Derivative Financial Instruments

At September 30, 2017, the carrying value of fixed-term debt accounted for under amortized cost was $12.6 billion (December 31, 2016 – $15.1 billion) and the fair value was $14.9 billion (December 31, 2016 – $17.5 billion). The estimated fair value of long-term debt is based on pricing sourced from market data.

12. PROVISIONS

An increase in the credit-adjusted risk-free interest rate to 4.00% (December 31, 2016 – 3.90%) partially offset by recognition of additional disturbances resulted in an overall decrease in the decommissioning and restoration provision of $15 million for the nine months ended September 30, 2017.

13. SALE OF LUBRICANTS BUSINESS

On February 1, 2017, the company completed the previously announced sale of its lubricants business for proceeds of $1.1 billion before closing adjustments and other closing costs. The sale of this business resulted in an after-tax gain of $354 million, including a current tax expense of $101 million and a deferred tax recovery of $11 million, in the Refining and Marketing segment.

14. SALE OF CEDAR POINT

The company sold its interest in the Cedar Point wind facility in southwestern Ontario for proceeds of $291 million before closing adjustments and other closing costs, with an effective date of January 1, 2017. The disposition resulted in an after-tax gain of $83 million, including a current tax expense of $29 million and a deferred tax recovery of $15 million, in the Corporate, Energy Trading and Eliminations segment.

52 SUNCOR ENERGY INC. 2017 THIRD QUARTER

QUARTERLY FINANCIAL SUMMARY
(unaudited)


	Three months ended										Nine months ended				Twelve months ended
($ millions, except per share amounts)	Sept 30 2017		Jun 30 2017		Mar 31 2017		Dec 31 2016		Sept 30 2016		Sept 30 2017		Sep 30 2016		Dec 31 2016

Revenues and other income	8 029		7 263		7 843	��	8 141		7 394		23 135		18 827		26 968

Net earnings (loss)

Oil Sands	314		(277	)	302		276		162		339		(1 425	)	(1 149	)

Exploration and Production	161		182		172		54		144		515		136		190

Refining and Marketing	597		346		829		524		436		1 772		1 366		1 890

Corporate, Energy Trading and Eliminations	217		184		49		(323	)	(350	)	450		(163	)	(486	)

	1 289		435		1 352		531		392		3 076		(86	)	445

Operating earnings (loss)^(A)

Oil Sands	314		(277	)	302		316		162		339		(1 425	)	(1 109	)

Exploration and Production	161		182		172		54		(36	)	515		(44	)	10

Refining and Marketing	597		346		475		524		436		1 418		1 366		1 890

Corporate, Energy Trading and Eliminations	(205	)	(52	)	(137	)	(258	)	(216	)	(394	)	(616	)	(874	)

	867		199		812		636		346		1 878		(719	)	(83	)

Funds from (used in) operations^(A)

Oil Sands	1 276		573		1 109		1 372		1 236		2 958		1 297		2 669

Exploration and Production	375		438		481		385		365		1294		928		1 313

Refining and Marketing	827		504		575		722		595		1 906		1 884		2 606

Corporate, Energy Trading and Eliminations	(6	)	112		(141	)	(114	)	(171	)	(35	)	(486	)	(600	)

	2 472		1 627		2 024		2 365		2 025		6 123		3 623		5 988

Per common share

Net earnings (loss) – basic	0.78		0.26		0.81		0.32		0.24		1.85		(0.05	)	0.28

Net earnings (loss) – diluted	0.78		0.26		0.81		0.32		0.24		1.84		(0.05	)	0.28

Net earnings (loss) attributable to common shareholders – basic	0.78		0.26		0.81		0.32		0.24		1.85		(0.06	)	0.27

Net earnings (loss) attributable to common shareholders – diluted	0.78		0.26		0.81		0.32		0.24		1.84		(0.06	)	0.27

Operating earnings (loss) – basic^(A)	0.52		0.10		0.49		0.38		0.21		1.13		(0.45	)	(0.05	)

Cash dividends – basic	0.32		0.32		0.32		0.29		0.29		0.96		0.87		1.16

Funds from operations – basic^(A)	1.49		0.98		1.21		1.42		1.22		3.68		2.28		3.72


	For the twelve months ended
	Sep 30 2017	Jun 30 2017	Mar 31 2017	Dec 31 2016	Sept 30 2016

Return on capital employed^(A)

– excluding major projects in progress (%)	7.0	6.2	4.4	0.5	(4.6	)

– including major projects in progress (%)	5.5	4.9	3.5	0.4	(3.9	)

(A): Non-GAAP financial measures. See the Operating Summary Information – Non-GAAP Financial Measures section of this Quarterly Report.

See accompanying footnotes and definitions to the quarterly operating summaries.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 53

QUARTERLY OPERATING SUMMARY
(unaudited)


	Three months ended					Nine months ended		Twelve months ended
Oil Sands	Sept 30 2017	Jun 30 2017	Mar 31 2017	Dec 31 2016	Sept 30 2016	Sept 30 2017	Sept 30 2016	Dec 31 2016

Total Production(mbbls/d)	628.4	413.6	590.6	620.4	617.5	544.3	466.0	504.9

Oil Sands operations

Production volumes(mbbls/d)

Upgraded product (sweet SCO, sour SCO & diesel)	324.4	288.6	332.8	324.5	301.1	315.3	236.8	258.9

Non-upgraded bitumen	144.9	64.0	115.7	108.9	132.6	108.2	118.2	115.9

Oil Sands operations production	469.3	352.6	448.5	433.4	433.7	423.5	355.0	374.8

Bitumen production(mbbls/d)

Mining	328.1	293.1	311.1	284.8	295.1	308.3	222.3	238.0

In Situ – Firebag	203.6	110.9	202.8	204.5	197.6	172.5	172.9	180.8

In Situ – MacKay River	30.8	30.0	35.6	33.9	26.6	32.1	25.5	27.6

Total bitumen production	562.5	434.0	549.5	523.2	519.3	512.9	420.7	446.4

Sales(mbbls/d)

Light sweet crude oil	105.9	104.4	124.9	87.2	100.8	111.7	87.4	87.3

Diesel	30.4	29.6	30.3	28.4	27.9	30.1	18.7	21.2

Light sour crude oil	183.2	160.1	176.4	201.5	162.5	173.2	137.2	153.4

Upgraded product (SCO and diesel)	319.5	294.1	331.6	317.1	291.2	315.0	243.3	261.9

Non-upgraded bitumen	120.3	86.0	104.9	103.5	123.5	103.8	122.1	117.4

Sales	439.8	380.1	436.5	420.6	414.7	418.8	365.4	379.3

Cash operating costs – Average^(1)(A) ($/bbl) *

Cash costs	20.40	25.70	20.15	22.10	20.30	21.75	25.30	24.35

Natural gas	1.20	2.10	2.40	2.85	1.85	1.90	1.85	2.15

	21.60	27.80	22.55	24.95	22.15	23.65	27.15	26.50

Cash operating costs – Mining bitumen production only^(1)(A)(B) ($/bbl)

Cash costs	20.60	21.25	19.95	22.55	19.30	20.55	26.05	25.00

Natural gas	0.25	0.60	0.60	0.80	0.50	0.45	0.55	0.60

	20.85	21.85	20.55	23.35	19.80	21.00	26.60	25.60

Cash operating costs – In Situ bitumen production only^(1)(A) ($/bbl)

Cash costs	6.75	10.95	7.00	6.35	7.15	7.80	8.15	7.60

Natural gas	2.20	4.00	4.00	4.40	3.30	3.30	2.85	3.30

	8.95	14.95	11.00	10.75	10.45	11.10	11.00	10.90

(A): Non-GAAP financial measures. See the Operating Summary Information – Non-GAAP Financial Measures section of this Quarterly Report.
(B): Cash operating costs – Mining bitumen production only for the twelve months ended December 31, 2016 has been restated.

See accompanying footnotes and definitions to the quarterly operating summaries.

54 SUNCOR ENERGY INC. 2017 THIRD QUARTER

QUARTERLY OPERATING SUMMARY (continued)
(unaudited)


	Three months ended					Nine months ended		Twelve months ended
Oil Sands	Sept 30 2017	Jun 30 2017	Mar 31 2017	Dec 31 2016	Sept 30 2016	Sept 30 2017	Sept 30 2016	Dec 31 2016

Syncrude

Sweet SCO production(mbbls/d)	159.1	61.0	142.1	187.0	183.8	120.8	111.0	130.1

Bitumen production (mbbls/d)	193.7	82.4	170.0	219.6	210.1	148.8	128.0	151.1

Intermediate sour SCO (mbbls/d)⁽²⁾	157.1	61.3	140.9	192.6	179.2	118.1	110.6	131.2

Cash operating costs^(1)(A) ($/bbl)

Cash costs	34.00	89.90	43.25	31.05	26.50	47.70	36.60	34.60

Natural gas	1.00	7.90	1.90	1.50	1.15	1.80	1.25	1.35

	35.00	97.80	45.15	32.55	27.65	49.50	37.85	35.95

(A): Non-GAAP financial measures. See the Operating Summary Information – Non-GAAP Financial Measures section of this Quarterly Report.

See accompanying footnotes and definitions to the quarterly operating summaries.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 55

QUARTERLY OPERATING SUMMARY (continued)
(unaudited)


	Three months ended										Nine months ended				Twelve months ended
Oil Sands Operating Netbacks^(A)	Sept 30 2017		Jun 30 2017		Mar 31 2017		Dec 31 2016		Sept 30 2016		Sept 30 2017		Sept 30 2016		Dec 31 2016

Bitumen ($/bbl)

Average price realized	38.10		37.61		35.03		31.68		26.67		36.94		20.49		23.50

Royalties	(0.50	)	(0.69	)	(0.54	)	(0.33	)	(0.39	)	(0.57	)	(0.20	)	(0.23	)

Transportation costs	(3.78	)	(7.06	)	(6.57	)	(5.52	)	(4.80	)	(5.61	)	(5.34	)	(5.38	)

Net operating expenses	(8.26	)	(14.05	)	(9.98	)	(9.99	)	(10.73	)	(10.43	)	(11.59	)	(11.25	)

Operating netback	25.56		15.81		17.94		15.84		10.75		20.33		3.36		6.64

SCO and diesel ($/bbl)

Average price realized	59.69		64.20		66.38		62.28		56.69		63.42		50.04		53.53

Royalties	(1.03	)	(1.19	)	(0.59	)	2.74		(0.42	)	(0.93	)	(0.48	)	0.50

Transportation costs	(3.65	)	(3.72	)	(3.98	)	(3.98	)	(2.96	)	(3.78	)	(3.67	)	(3.76	)

Net operating expenses – bitumen	(21.66	)	(24.14	)	(21.01	)	(22.56	)	(20.69	)	(22.22	)	(25.87	)	(24.87	)

Net operating expenses – upgrading	(3.28	)	(4.15	)	(3.58	)	(4.31	)	(4.34	)	(3.65	)	(5.86	)	(5.38	)

Operating netback	30.07		31.00		37.22		34.17		28.28		32.84		14.16		20.02

Average Oil Sands operations ($/bbl)

Average price realized	53.78		58.18		58.84		54.75		47.75		56.85		40.17		44.23

Royalties	(0.89	)	(1.07	)	(0.58	)	1.99		(0.41	)	(0.84	)	(0.38	)	0.28

Transportation costs	(3.68	)	(4.47	)	(4.60	)	(4.36	)	(3.51	)	(4.24	)	(4.23	)	(4.26	)

Net operating expenses – bitumen and upgrading	(20.38	)	(25.08	)	(21.07	)	(22.72	)	(20.77	)	(22.03	)	(25.00	)	(24.37	)

Operating netback	28.83		27.56		32.59		29.66		23.06		29.74		10.56		15.88

Syncrude ($/bbl)

Average price realized	60.68		62.27		66.37		64.28		58.62		63.16		54.42		56.91

Royalties	(3.18	)	—		(2.96	)	(4.70	)	(0.26	)	(2.56	)	(0.31	)	(1.90	)

Transportation costs	(0.38	)	(1.83	)	(0.38	)	(0.35	)	(0.29	)	(0.62	)	(0.63	)	(0.53	)

Net operating expenses – bitumen and upgrading	(31.48	)	(90.72	)	(39.70	)	(29.18	)	(25.05	)	(44.65	)	(33.62	)	(32.05	)

Operating netback	25.64		(30.28	)	23.33		30.05		33.02		15.33		19.86		22.43

(A): Non-GAAP financial measures. See the Operating Summary Information – Non-GAAP Financial Measures section of this Quarterly Report.

See accompanying footnotes and definitions to the quarterly operating summaries.

56 SUNCOR ENERGY INC. 2017 THIRD QUARTER

QUARTERLY OPERATING SUMMARY (continued)
(unaudited)


	Three months ended										Nine months ended				Twelve months ended
Exploration and Production	Sept 30 2017		Jun 30 2017		Mar 31 2017		Dec 31 2016		Sept 30 2016		Sept 30 2017		Sept 30 2016		Dec 31 2016

Total Sales Volumes(mboe/d)	112.6		130.3		136.8		120.5		103.1		126.5		118.9		119.3

Total Production(mboe/d)	111.5		125.5		134.5		118.1		110.6		123.8		118.2		117.9

Production Volumes

Exploration and Production Canada

East Coast Canada

Terra Nova (mbbls/d)	5.8		11.0		14.7		16.7		14.7		10.5		11.0		12.4

Hibernia (mbbls/d)	26.6		30.0		30.3		30.1		28.2		28.9		25.6		26.8

White Rose (mbbls/d)	9.0		12.9		13.1		10.9		7.5		11.7		11.0		10.9

North America Onshore(mboe/d)	1.5		1.8		2.8		2.8		2.7		2.0		2.8		2.8

	42.9		55.7		60.9		60.5		53.1		53.1		50.4		52.9

Exploration and Production International

Buzzard (mboe/d)	44.3		45.3		49.0		37.5		40.8		46.2		48.9		46.0

Golden Eagle (mboe/d)	20.5		20.1		20.2		19.0		16.2		20.3		18.5		18.6

United Kingdom (mboe/d)	64.8		65.4		69.2		56.5		57.0		66.5		67.4		64.6

Libya (mbbls/d)⁽³⁾	3.8		4.4		4.4		1.1		0.5		4.2		0.4		0.4

	68.6		69.8		73.6		57.6		57.5		70.7		67.8		65.0

Netbacks^(A)

East Coast Canada ($/bbl)

Average price realized	67.23		66.26		69.75		68.06		61.63		67.81		55.71		59.31

Royalties	(13.01	)	(14.05	)	(15.94	)	(15.07	)	(10.93	)	(14.47	)	(8.81	)	(10.64	)

Transportation costs	(2.13	)	(1.60	)	(1.72	)	(1.72	)	(2.33	)	(1.79	)	(1.99	)	(1.91	)

Operating costs	(14.72	)	(10.58	)	(9.28	)	(9.52	)	(13.57	)	(11.20	)	(13.99	)	(12.67	)

Operating netback	37.37		40.03		42.81		41.75		34.80		40.35		30.92		34.09

United Kingdom ($/boe)

Average price realized	62.99		63.46		67.55		62.63		56.96		64.71		51.46		53.91

Transportation costs	(1.77	)	(1.88	)	(1.81	)	(1.62	)	(1.69	)	(1.82	)	(1.90	)	(1.84	)

Operating costs	(4.51	)	(4.57	)	(3.75	)	(7.00	)	(5.29	)	(4.27	)	(5.23	)	(5.62	)

Operating netback	56.71		57.01		61.99		54.01		49.98		58.62		44.33		46.45

(A): Non-GAAP financial measures. See the Operating Summary Information – Non-GAAP Financial Measures section of this Quarterly Report.

See accompanying footnotes and definitions to the quarterly operating summaries.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 57

QUARTERLY OPERATING SUMMARY (continued)
(unaudited)


	Three months ended					Nine months ended		Twelve months ended
Refining and Marketing	Sept 30 2017	Jun 30 2017	Mar 31 2017	Dec 31 2016	Sept 30 2016	Sept 30 2017	Sept 30 2016	Dec 31 2016

Refined product sales(mbbls/d)	564.5	521.9	508.0	514.8	548.7	531.7	523.7	521.4

Crude oil processed(mbbls/d)	466.8	435.5	429.9	427.3	465.6	444.2	429.0	428.6

Utilization of refining capacity(%)	101	94	93	93	101	96	93	93

Refining margin($/bbl)^(A)	23.80	18.85	22.30	23.00	17.75	21.70	19.40	20.30

Refining operating expense($/bbl)^(A)	4.50	5.05	5.50	5.45	4.55	5.00	5.00	5.10

Eastern North America

Refined product sales(mbbls/d)

Transportation fuels

Gasoline	121.2	114.8	112.8	115.5	119.8	116.3	115.1	115.2

Distillate	92.6	82.9	82.2	79.9	77.8	85.9	75.1	76.3

Total transportation fuel sales	213.8	197.7	195.0	195.4	197.6	202.2	190.2	191.5

Petrochemicals	10.6	12.2	15.5	10.1	7.2	12.8	9.0	9.2

Asphalt	20.6	18.0	12.6	16.8	22.9	17.1	16.7	16.7

Other	32.4	35.5	34.5	34.4	34.6	34.1	36.4	35.9

Total refined product sales	277.4	263.4	257.6	256.7	262.3	266.2	252.3	253.3

Crude oil supply and refining

Processed at refineries (mbbls/d)	213.9	208.6	214.6	204.8	213.5	212.3	202.4	203.1

Utilization of refining capacity (%)	96	94	97	92	96	96	91	92

Western North America

Refined product sales(mbbls/d)

Transportation fuels

Gasoline	136.4	122.0	117.1	125.8	134.6	125.3	130.2	129.1

Distillate	119.9	108.3	110.1	106.8	117.4	112.8	110.8	109.8

Total transportation fuel sales	256.3	230.3	227.2	232.6	252.0	238.1	241.0	238.9

Asphalt	16.0	14.6	9.2	9.7	16.9	13.3	12.4	11.8

Other	14.8	13.6	14.0	15.8	17.5	14.1	18.0	17.4

Total refined product sales	287.1	258.5	250.4	258.1	286.4	265.5	271.4	268.1

Crude oil supply and refining

Processed at refineries (mbbls/d)	252.9	226.9	215.3	222.5	252.1	231.9	226.6	225.5

Utilization of refining capacity (%)	105	95	90	93	105	97	94	94

(A): Non-GAAP financial measures. See the Operating Summary Information – Non-GAAP Financial Measures section of this Quarterly Report.

See accompanying footnotes and definitions to the quarterly operating summaries.

58 SUNCOR ENERGY INC. 2017 THIRD QUARTER

QUARTERLY OPERATING METRICS RECONCILIATION
(unaudited)

Oil Sands Netbacks(A)
($ millions except per barrel amounts)


For the quarter ended September 30, 2017	Bitumen		SCO and Diesel		Oil Sands Operations		Syncrude		Other(4)		Oil Sands Segment

Operating revenues	543		1 787		2 330		901		2		3 233

Other (loss) income	(5	)	(2	)	(7	)	1		—		(6	)

Purchases of crude oil and products	(103	)	(18	)	(121	)	(12	)	(2	)	(135	)

Gross realization adjustment⁽⁵⁾	(14	)	(13	)	(27	)	(1	)

Gross realizations	421		1 754		2 175		889

Royalties	(5	)	(30	)	(35	)	(47	)	—		(82	)

Transportation	(46	)	(107	)	(153	)	(11	)	—		(164	)

Transportation adjustment⁽⁶⁾	4		—		4		6

Net transportation expenses	(42	)	(107	)	(149	)	(5	)

Operating, selling and general	(115	)	(870	)	(985	)	(525	)	(3	)	(1 513	)

OS&G adjustment⁽⁷⁾	24		137		161		63

Net operating expenses	(91	)	(733	)	(824	)	(462	)

Gross profit	283		884		1 167		375

Sales volumes (mbbls)	11 075		29 390		40 465		14 636

Operating netback per barrel	25.56		30.07		28.83		25.64


For the quarter ended June 30, 2017	Bitumen		SCO and Diesel		Oil Sands Operations		Syncrude		Other(4)		Oil Sands Segment

Operating revenues	377		1 758		2 135		361		2		2 498

Other income (loss)	12		(1	)	11		—		6		17

Purchases of crude oil and products	(101	)	(21	)	(122	)	(15	)	(2	)	(139	)

Gross realization adjustment⁽⁵⁾	6		(18	)	(12	)	—

Gross realizations	294		1 718		2 012		346

Royalties	(5	)	(32	)	(37	)	—		—		(37	)

Transportation	(55	)	(100	)	(155	)	(13	)	—		(168	)

Transportation adjustment⁽⁶⁾	—		—		—		3

Net transportation expenses	(55	)	(100	)	(155	)	(10	)

Operating, selling and general	(126	)	(900	)	(1 026	)	(551	)	2		(1 575	)

OS&G adjustment⁽⁷⁾	16		143		159		47

Net operating expenses	(110	)	(757	)	(867	)	(504	)

Gross profit (loss)	124		829		953		(168	)

Sales volumes (mbbls)	7 827		26 764		34 590		5 549

Operating netback per barrel	15.81		31.00		27.56		(30.28	)

(A): Non-GAAP financial measures. See the Operating Summary Information – Non-GAAP Financial Measures section of this Quarterly Report.

See accompanying footnotes and definitions to the quarterly operating summaries.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 59

QUARTERLY OPERATING METRICS RECONCILIATION (continued)
(unaudited)

Oil Sands Netbacks(A)
($ millions except per barrel amounts)


For the quarter ended March 31, 2017	Bitumen		SCO and Diesel		Oil Sands Operations		Syncrude		Other(4)	Oil Sands Segment

Operating revenues	400		2 022		2 422		868		—	3 290

Other income	9		3		12		2		—	14

Purchases of crude oil and products	(75	)	(22	)	(97	)	(19	)	—	(116	)

Gross realization adjustment⁽⁵⁾	(4	)	(22	)	(26	)	(2	)

Gross realizations	330		1 981		2 311		849

Royalties	(5	)	(18	)	(23	)	(38	)	—	(61	)

Transportation	(62	)	(118	)	(180	)	(9	)	—	(189	)

Transportation adjustment⁽⁶⁾	—		—		—		4

Net transportation expenses	(62	)	(118	)	(180	)	(5	)

Operating, selling and general	(123	)	(875	)	(998	)	(583	)	28	(1 553	)

OS&G adjustment⁽⁷⁾	29		141		170		76

Net operating expenses	(94	)	(734	)	(828	)	(507	)

Gross profit	169		1 111		1 280		299

Sales volumes (mbbls)	9 444		29 844		39 288		12 788

Operating netback per barrel	17.94		37.22		32.59		23.33


For the quarter ended December 31, 2016	Bitumen		SCO and Diesel		Oil Sands Operations		Syncrude		Other(4)		Oil Sands Segment

Operating revenues	375		1 865		2 240		1 116		—		3 356

Other (loss) income	(4	)	(5	)	(9	)	17		—		8

Purchases of crude oil and products	(62	)	(20	)	(82	)	(19	)	—		(101	)

Gross realization adjustment⁽⁵⁾	(7	)	(25	)	(32	)	(8	)

Gross realizations	302		1 815		2 117		1 106

Royalties	(3	)	80		77		(81	)	—		(4	)

Transportation	(52	)	(116	)	(168	)	(9	)	—		(177	)

Transportation adjustment⁽⁶⁾	—		—		—		3

Net transportation expenses	(52	)	(116	)	(168	)	(6	)

Operating, selling and general	(121	)	(935	)	(1 056	)	(577	)	(1	)	(1 634	)

OS&G adjustment⁽⁷⁾	25		152		177		75

Net operating expenses	(96	)	(783	)	(879	)	(502	)

Gross profit	151		996		1 147		517

Sales volumes (mbbls)	9 525		29 176		38 701		17 205

Operating netback per barrel	15.84		34.17		29.66		30.05

(A): Non-GAAP financial measures. See the Operating Summary Information – Non-GAAP Financial Measures section of this Quarterly Report.

See accompanying footnotes and definitions to the quarterly operating summaries.

60 SUNCOR ENERGY INC. 2017 THIRD QUARTER

QUARTERLY OPERATING METRICS RECONCILIATION (continued)
(unaudited)

Oil Sands Netbacks(A)
($ millions except per barrel amounts)


For the quarter ended September 30, 2016	Bitumen		SCO and Diesel		Oil Sands Operations		Syncrude		Other(4)	Oil Sands Segment

Operating revenues	406		1 562		1 968		999		—	2 967

Other income	3		—		3		—		—	3

Purchases of crude oil and products	(95	)	(24	)	(119	)	(16	)	—	(135	)

Gross realization adjustment⁽⁵⁾	(11	)	(19	)	(30	)	8

Gross realizations	303		1 519		1 822		991

Royalties	(5	)	(11	)	(16	)	(4	)	—	(20	)

Transportation	(55	)	(90	)	(145	)	(14	)	—	(159	)

Transportation adjustment⁽⁶⁾	—		11		11		9

Net transportation expenses	(55	)	(79	)	(134	)	(5	)

Operating, selling and general	(145	)	(803	)	(948	)	(474	)	2	(1 420	)

OS&G adjustment⁽⁷⁾	24		132		156		50

Net operating expenses	(121	)	(671	)	(792	)	(424	)

Gross profit	122		758		880		558

Sales volumes (mbbls)	11 368		26 786		38 154		16 906

Operating netback per barrel	10.75		28.28		23.06		33.02


For the nine months ended September 30, 2017	Bitumen		SCO and Diesel		Oil Sands Operations		Syncrude		Other(4)		Oil Sands Segment

Operating revenues	1 320		5 567		6 887		2 130		4		9 021

Other income	16		—		16		3		6		25

Purchases of crude oil and products	(279	)	(61	)	(340	)	(46	)	(4	)	(390	)

Gross realization adjustment⁽⁵⁾	(12	)	(53	)	(65	)	(3	)

Gross realizations	1 045		5 453		6 498		2 084

Royalties	(15	)	(80	)	(95	)	(85	)	—		(180	)

Transportation	(163	)	(325	)	(488	)	(33	)	—		(521	)

Transportation adjustment⁽⁶⁾	4		—		4		13

Net transportation expenses	(159	)	(325	)	(484	)	(20	)

Operating, selling and general	(364	)	(2 645	)	(3 009	)	(1 659	)	27		(4 641	)

OS&G adjustment⁽⁷⁾	69		421		490		186

Net operating expenses	(295	)	(2 224	)	(2 519	)	(1 473	)

Gross profit	576		2 824		3 400		506

Sales volumes (mbbls)	28 346		85 997		114 343		32 974

Operating netback per barrel	20.33		32.84		29.74		15.33

(A): Non-GAAP financial measures. See the Operating Summary Information – Non-GAAP Financial Measures section of this Quarterly Report.

See accompanying footnotes and definitions to the quarterly operating summaries.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 61

QUARTERLY OPERATING METRICS RECONCILIATION (continued)
(unaudited)

Oil Sands Netbacks(A)
($ millions except per barrel amounts)


For the nine months ended September 30, 2016	Bitumen		SCO and Diesel		Oil Sands Operations		Syncrude		Other(4)	Oil Sands Segment

Operating revenues	1 059		3 417		4 476		1 690		—	6 166

Other income	12		6		18		—		—	18

Purchases of crude oil and products	(370	)	(40	)	(410	)	(37	)	—	(447	)

Gross realization adjustment⁽⁵⁾	(15	)	(46	)	(61	)	2

Gross realizations	686		3 337		4 023		1 655

Royalties	(7	)	(32	)	(39	)	(9	)	—	(48	)

Transportation	(178	)	(269	)	(447	)	(42	)	—	(489	)

Transportation adjustment⁽⁶⁾	—		25		25		22

Net transportation expenses	(178	)	(244	)	(422	)	(20	)

Operating, selling and general	(474	)	(2 533	)	(3 007	)	(1 172	)	36	(4 143	)

OS&G adjustment⁽⁷⁾	87		415		502		150

Net operating expenses	(387	)	(2 118	)	(2 505	)	(1 022	)

Gross profit	114		943		1 057		604

Sales volumes (mbbls)	33 448		66 677		100 124		30 409

Operating netback per barrel	3.36		14.16		10.56		19.86


For the year ended December 31, 2016	Bitumen		SCO and Diesel		Oil Sands Operations		Syncrude		Other(4)	Oil Sands Segment

Operating revenues	1 434		5 281		6 715		2 807		—	9 522

Other income	6		2		8		17		1	26

Purchases of crude oil and products	(408	)	(83	)	(491	)	(57	)	—	(548	)

Gross realization adjustment⁽⁵⁾	(22	)	(70	)	(92	)	(57	)
							��
Gross realizations	1 010		5 130		6 140		2 710

Royalties	(10	)	48		38		(90	)	—	(52	)

Transportation	(231	)	(385	)	(616	)	(50	)	—	(666	)

Transportation adjustment⁽⁶⁾	—		25		25		25

Net transportation expenses	(231	)	(360	)	(591	)	(25	)

Operating, selling and general	(595	)	(3 468	)	(4 063	)	(1 749	)	35	(5 777	)

OS&G adjustment⁽⁷⁾	112		568		680		223

Net operating expenses	(483	)	(2 900	)	(3 383	)	(1 526	)

Gross profit	286		1 918		2 204		1 069

Sales volumes (mbbls)	42 973		95 852		138 825		47 614

Operating netback per barrel	6.64		20.02		15.88		22.43

(A): Non-GAAP financial measures. See the Operating Summary Information – Non-GAAP Financial Measures section of this Quarterly Report.

See accompanying footnotes and definitions to the quarterly operating summaries.

62 SUNCOR ENERGY INC. 2017 THIRD QUARTER

QUARTERLY OPERATING METRICS RECONCILIATION (continued)
(unaudited)

Syncrude Cash Operating Costs(A)
($ millions except per barrel amounts)


	Three months ended										Nine months ended				Twelve months ended
	Sept 30 2017		June 30 2017		Mar 31 2017		Dec 31 2016		Sept 30 2016		Sept 30 2017		Sept 30 2016		Dec 31 2016

Syncrude OS&G	525		551		583		577		474		1 659		1 172		1 749

Non-production costs⁽⁸⁾	(13	)	(8	)	(6	)	(17	)	(7	)	(27	)	(22	)	(31	)

Syncrude cash operating costs	512		543		577		560		467		1 632		1 150		1 718

Syncrude sales volumes (mbbls)	14 636		5 549		12 788		17 205		16 906		32 973		30 409		47 614

Syncrude cash operating costs ($/bbl)	35.00		97.80		45.15		32.55		27.65		49.50		37.85		35.95

Exploration and Production Netbacks(A)
($ millions except per barrel amounts)


For the quarter ended September 30, 2017	United Kingdom		East Coast Canada		Other(9)		E&P Segment

Operating revenues	375		263		128		766

Royalties	—		(51	)	(81	)	(132	)

Transportation	(11	)	(8	)	(2	)	(21	)

Operating, selling and general	(31	)	(68	)	(10	)	(109	)

Non-production costs⁽¹⁰⁾	5		10

Gross realizations	338		146

Sales volumes (mboe)	5 963		3 906

Operating netback per barrel	56.71		37.37


For the quarter ended June 30, 2017	United Kingdom		East Coast Canada		Other(9)		E&P Segment

Operating revenues	378		354		120		852

Royalties	—		(75	)	(46	)	(121	)

Transportation	(11	)	(9	)	(2	)	(22	)

Operating, selling and general	(31	)	(65	)	(15	)	(111	)

Non-production costs⁽¹⁰⁾	4		9

Gross realizations	340		214

Sales volumes (mboe)	5 954		5 345

Operating netback per barrel	57.01		40.03


For the quarter ended March 31, 2017	United Kingdom		East Coast Canada		Other(9)		E&P Segment

Operating revenues	421		379		120		920

Royalties	—		(87	)	(36	)	(123	)

Transportation	(11	)	(9	)	(3	)	(23	)

Operating, selling and general	(28	)	(60	)	(13	)	(101	)

Non-production costs⁽¹⁰⁾	4		10

Gross realizations	386		233

Sales volumes (mboe)	6 228		5 432

Operating netback per barrel	61.99		42.81

(A): Non-GAAP financial measures. See the Operating Summary Information – Non-GAAP Financial Measures section of this Quarterly Report.

See accompanying footnotes and definitions to the quarterly operating summaries.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 63

QUARTERLY OPERATING METRICS RECONCILIATION (continued)
(unaudited)

Exploration and Production Netbacks(A)
($ millions except per barrel amounts)


For the quarter ended December 31, 2016	United Kingdom		East Coast Canada		Other(9)		E&P Segment

Operating revenues	325		374		43		742

Royalties	—		(83	)	(12	)	(95	)

Transportation	(9	)	(10	)	(2	)	(21	)

Operating, selling and general	(38	)	(63	)	(14	)	(115	)

Non-production costs⁽¹⁰⁾	3		11

Gross realizations	281		229

Sales volumes (mboe)	5 193		5 495

Operating netback per barrel	54.01		41.75


For the quarter ended September 30, 2016	United Kingdom		East Coast Canada		Other(9)		E&P Segment

Operating revenues	300		246		1		547

Royalties	—		(44	)	—		(44	)

Transportation	(9	)	(9	)	(2	)	(20	)

Operating, selling and general	(33	)	(62	)	(12	)	(107	)

Non-production costs⁽¹⁰⁾	4		8

Gross realizations	262		139

Sales volumes (mboe)	5 247		3 987

Operating netback per barrel	49.98		34.80


For the nine months ended September 30, 2017	United Kingdom		East Coast Canada		Other(9)		E&P Segment

Operating revenues	1 174		996		368		2 538

Royalties	—		(213	)	(163	)	(376	)

Transportation	(33	)	(26	)	(7	)	(66	)

Operating, selling and general	(91	)	(193	)	(37	)	(321	)

Non-production costs⁽¹⁰⁾	14		29

Gross realizations	1 064		593

Sales volumes (mboe)	18 146		14 683

Operating netback per barrel	58.62		40.35

(A): Non-GAAP financial measures. See the Operating Summary Information – Non-GAAP Financial Measures section of this Quarterly Report.

See accompanying footnotes and definitions to the quarterly operating summaries.

64 SUNCOR ENERGY INC. 2017 THIRD QUARTER

QUARTERLY OPERATING METRICS RECONCILIATION (continued)
(unaudited)

Exploration and Production Netbacks(A)
($ millions except per barrel amounts)


For the nine months ended September 30, 2016	United Kingdom		East Coast Canada		Other(9)		E&P Segment

Operating revenues	950		744		8		1 702

Royalties	—		(118	)	—		(118	)

Transportation	(35	)	(27	)	(3	)	(65	)

Operating, selling and general	(113	)	(216	)	(39	)	(368	)

Non-production costs⁽¹⁰⁾	16		29

Gross realizations	818		412

Sales volumes (mboe)	18 460		13 354

Operating netback per barrel	44.33		30.92


For the year ended December 31, 2016	United Kingdom		East Coast Canada		Other(9)		E&P Segment

Operating revenues	1 276		1 119		49		2 444

Royalties	—		(201	)	(12	)	(213	)

Transportation	(44	)	(36	)	(6	)	(86	)

Operating, selling and general	(151	)	(278	)	(54	)	(483	)

Non-production costs⁽¹⁰⁾	18		39

Gross realizations	1 099		643

Sales volumes (mboe)	23 653		18 849

Operating netback per barrel	46.45		34.09

Refining and Marketing
($ millions except per barrel amounts)


	Three months ended										Nine months ended				Twelve months ended
	Sept 30 2017		June 30 2017		Mar 31 2017		Dec 31 2016		Sept 30 2016		Sept 30 2017		Sept 30 2016		Dec 31 2016

Gross margin⁽¹¹⁾	1 520		1 160		1 401		1 580		1 377		4 081		4 233		5 813

Other income (loss)	48		19		19		(10	)	13		86		26		16

Non-refining margin⁽¹²⁾	(463	)	(375	)	(495	)	(592	)	(572	)	(1 333	)	(1 811	)	(2 403	)

Refining margin	1 105		804		925		978		818		2 834		2 448		3 426

Refinery production (mbbls)⁽¹³⁾	46 491		42 629		41 540		42 510		46 119		130 660		126 288		168 798

Refining margin ($/bbl)^(A)	23.80		18.85		22.30		23.00		17.75		21.70		19.40		20.30

Operating, selling and general	481		464		517		586		549		1 462		1 617		2 203

Non-refining costs⁽¹⁴⁾	(272	)	(249	)	(288	)	(355	)	(339	)	(809	)	(988	)	(1 343	)

Refining operating expense	209		215		229		231		210		653		629		860

Refinery production (mbbls)⁽¹³⁾	46 491		42 629		41 540		42 510		46 119		130 660		126 288		168 798

Refining operating expense ($/bbl)^(A)	4.50		5.05		5.50		5.45		4.55		5.00		5.00		5.10

(A): Non-GAAP financial measures. See the Operating Summary Information – Non-GAAP Financial Measures section of this Quarterly Report.

See accompanying footnotes and definitions to the quarterly operating summaries.

SUNCOR ENERGY INC. 2017 THIRD QUARTER 65

OPERATING SUMMARY INFORMATION

Non-GAAP Financial Measures

Certain financial measures in this document – namely operating earnings (loss), funds from (used in) operations, return on capital employed (ROCE), Oil Sands operations cash operating costs, Syncrude cash operating costs, refining margin, refining operating expense and netbacks – are not prescribed by GAAP. Suncor includes these financial measures because investors may use this information to analyze business performance, leverage and liquidity. These non-GAAP financial measures do not have any standardized meaning and, therefore, are unlikely to be comparable to similar measures presented by other companies. The additional information should not be considered in isolation or as a substitute for measures of performance prepared in accordance with GAAP.

Operating earnings (loss) and Oil Sands operations cash operating costs for each quarter in 2017 and 2016 are defined in the Non-GAAP Financial Measures Advisory section and reconciled to GAAP measures in each respective quarterly Report to Shareholders issued by Suncor in respect of the relevant quarter (Quarterly Reports). Funds from (used in) operations and ROCE for each quarter in 2017 and 2016 are defined and reconciled to GAAP measures in the Non-GAAP Financial Measures Advisory section of each respective Quarterly Report. Refining margin, refining operating expense and Syncrude cash operating costs for each relevant quarter in 2017 and 2016 and for the year ended December 31, 2016 are defined in the Non-GAAP Financial Measures Advisory section and reconciled to GAAP measures in the Operating Metrics Reconciliation section of this Quarterly Report. Netbacks for each relevant quarter in 2017 and 2016 and for the year ended December 31, 2016 are defined below and are reconciled to GAAP measures in the Operating Metrics Reconciliation section of this Quarterly Report.

Oil Sands Netbacks

Oil Sands operating netbacks are a non-GAAP measure, presented on a crude product and sales barrel basis, and are derived from the Oil Sands segmented statement of net earnings (loss), after adjusting for items not directly attributable to the revenues and costs associated with production and delivery. Management uses Oil Sands operating netbacks to measure crude product profitability on a sales barrel basis.

Exploration and Production Netbacks

Exploration and Production (E&P) netbacks are a non-GAAP measure, presented on an asset location and sales barrel basis, and are derived from the E&P segmented statement of net earnings (loss), after adjusting for items not directly attributable to the costs associated with production and delivery. Management uses Exploration and Production operating netbacks to measure asset profitability by location on a sales barrel basis.

Definitions

(1): Cash operating costs – Include cash costs that are defined as operating, selling and general expenses (excluding inventory changes and non-production costs), and are net of operating revenues associated with excess power from cogeneration units. Oil Sands operations cash operating costs are presented on a production basis by adjusting for inventory impacts, while Syncrude production volumes are equal to sales volumes.
(2): Syncrude's capacity to upgrade bitumen to an intermediary sour SCO is 350,000 bbls/d.
(3): Effective 2016, Libyan production volumes reflect the company's entitlement share of production sold in the period.
(4): Reflects non-producing Oil Sands assets and enterprise shared service allocations and recoveries.
(5): Reflects the impact of items not directly attributed to revenues received from the sale of proprietary crude and net non-proprietary activity at its deemed point of sale.
(6): Reflects adjustments for expenses or credits not directly related to the transportation of the crude product to its deemed point of sale. For Oil Sands operations bitumen and SCO, the point of sale is at the final customer, whereas Syncrude sweet SCO is deemed to be sold into the sweet synthetic crude oil pool in Edmonton, Alberta. Expenses or credits adjusted out of the netback transportation line include, but are not limited to, costs associated with the sale of non-proprietary product on pipelines with unutilized capacity under minimum volume commitment agreements.
(7): Reflects adjustments for general and administrative costs not directly attributed to the production of each crude product type, as well as the revenues associated with excess power from cogeneration units.
(8): Reflects adjustments for operating, selling and general expenses not directly attributable to Syncrude production.
(9): Reflects other Exploration and Production assets, such as North America Onshore, Norway and Libya.

66 SUNCOR ENERGY INC. 2017 THIRD QUARTER

OPERATING SUMMARY INFORMATION (continued)

(10) Reflects adjustments for general and administrative costs not directly attributed to production.

(11) Operating revenues less purchases of crude oil and products.

(12) Reflects the gross margin associated with the company's supply, marketing, lubricants and ethanol businesses.

(13) Refinery production is the output of the refining process, and differs from crude oil processed as a result of volumetric adjustments for non-crude feedstock, volumetric gain associated with the refining process, and changes in unfinished product inventories.

(14) Reflects operating, selling and general costs associated with the company's supply, marketing, lubricants and ethanol businesses, as well as certain general and administrative costs not directly attributable to refinery production.

Explanatory Notes

*: Users are cautioned that the Syncrude cash operating costs per barrel measure may not be fully comparable to similar information calculated by other entities (including Suncor's Oil Sands operations cash operating costs per barrel, which exclude Syncrude) due to differing operations of each company as well as other companies' respective accounting policy choices.

Abbreviations


bbl		– barrel
mbbls		– thousands of barrels
mbbls/d		– thousands of barrels per day
boe		– barrels of oil equivalent
boe/d		– barrels of oil equivalent per day
mboe/d		– thousands of barrels of oil equivalent per day
m³/d		– cubic metres per day
SCO		– synthetic crude oil

Metric Conversion

Crude oil, refined products, etc. 1m³ (cubic metre) = approx. 6.29 barrels

SUNCOR ENERGY INC. 2017 THIRD QUARTER 67

Suncor Energy Inc.
150 - 6 Avenue S.W., Calgary, Alberta, Canada T2P 3E3
T: 403-296-8000

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EXHIBIT 99.1

Suncor Energy (SU) 6-KReport to Shareholders for the Third Quarter of 2017