Aecon Utilities Investment Overview

Forward-Looking Information Non-GAAP & Supplementary Financial Measures The information in this presentation includes certain forward-looking statements which may constitute forward-looking information under applicable securities laws. These forward-looking statements are based on currently available competitive, financial and economic data and operating plans but are subject to risks and uncertainties. Forward-looking statements may include, without limitation, statements regarding the operations, business, financial condition, expected financial results, performance, prospects, ongoing objectives, strategies and outlook for Aecon, including statements regarding: Oaktree's minority investment in Aecon Utilities, the expected benefits thereof and results therefrom, including the acceleration of growth of Aecon Utilities in Canada and the U.S.; the anticipated use of proceeds from Oaktree's minority investment in Aecon Utilities; the expansion of Aecon Utilities' geographic reach and range of services in the U.S.; Aecon Utilities' goal of targeting prudent balance sheet leverage and liquidity; expectations regarding significant opportunities arising from the Inflation Reduction Act (IRA) and Bipartisan Infrastructure Law (BIL) in the U.S.; its strategic focus on clean energy and other projects linked to sustainability and the opportunities arising therefrom; the impact of Aecon's recurring revenue base; potential value creation options, estimated costs and timelines for projects; the various phases of projects for Aecon; Aecon's greenhouse gas emission reduction targets and means to accomplish such targets; government investment; expectations regarding strong private sector end market demand due to, among other things, aging electrical and gas infrastructure and North American 5G adoption rate; expectations regarding ongoing recovery in travel through Bermuda International Airport in 2023; long-term cash flow and growth opportunities in concessions including opportunities to add to the existing portfolio of Canadian and international concessions in the next 12 to 24 months; expectations regarding the repayment of the outstanding convertible debentures at or before maturity and other debt obligations in 2023; expectations regarding the continued impact of inflation, interest rates and supply chain efficiency; expectations regarding the pipeline of opportunities available to Aecon and project pursuits; expectations regarding future revenue growth and the impact therefrom; expectations regarding the impact of the four fixed price legacy projects; Aecon's expectations of being able to strengthen its balance sheet while preserving capital for other long-term growth and concession opportunities; and, future dividends. Forward-looking statements may in some cases be identified by words such as "will," "believes," "target," "expects," "anticipates," "estimates," "towards," "opportunity," "projects," "intends," "schedule," "outlook," "can," "may," "to be," "upon," "should" or the negative of these terms, or similar expressions. In addition to events beyond Aecon's control, there are factors which could cause actual or future results, performance or achievements to differ materially from those expressed or inferred herein including, but not limited to: the risk of not being able to drive a higher margin mix of business by participating in more complex projects, achieving operational efficiencies and synergies, and improving margins; the risk of not being able to meet contractual schedules and other performance requirements on large, fixed priced contracts; the risk of not being able to meet its labour needs at reasonable costs; the risk of not being able to address any supply chain issues which may arise and pass on costs of supply increases to customers; the risk of not being able, through its joint ventures, to enter into implementation phases of certain projects following the successful completion of the relevant development phase; the risk of not being able to execute its strategy of building strong partnerships and alliances; the risk of not being able to execute its risk management strategy; the risk of not being able to grow backlog across the organization by winning major projects; the risk of not being able to maintain a number of open, recurring and repeat contracts; the risk of not being able to accurately assess the risks and opportunities related to its industry's transition to a lower-carbon economy; the risk of not being able to oversee, and where appropriate, respond to known and unknown environmental and climate change-related risks, including the ability to recognize and adequately respond to climate change concerns or public, governmental and other stakeholders' expectations on climate matters; the risk of not being able to meet its commitment to meeting its greenhouse gas emissions reduction targets; the risks associated with the strategy of differentiating its service offerings in key end markets; the risks associated with undertaking initiatives to train employees; the risks associated with the seasonal nature of its business; the risks associated with being able to participate in large projects; the risks associated with legal proceedings to which it is a party; the ability to successfully respond to shareholder activism; the risk that the strategic partnership with Green Infrastructure Partners Inc. ("GIP") will not realize the expected results and may negatively impact Aecon's existing business; the risk that Aecon will not realize the anticipated balance sheet flexibility with the completion of the sale of ATE; the risk that Aecon will not realize the opportunities presented by a transition to a net-zero economy; the risk that Aecon will not realize the strategic rationale for the sale of the equity interest in Skyport; the risk that the strategic partnership with Oaktree will not realize the expected results and may negatively impact the existing business of Aecon Utilities; the risk that Aecon will not realize the anticipated balance sheet flexibility with the completion of the sale of minority interest in Aecon Utilities; the risk that Aecon Utilities will not realize opportunities to expand its geographic reach and range of services in the U.S.; the risk that Aecon will not realize the anticipated balance sheet strength while preserving capital for other long-term growth and concession opportunities in connection with the sale of the equity interest in Skyport; and risks associated with the COVID-19 pandemic and future pandemics and Aecon's ability to respond to and implement measures to mitigate the impact of COVID-19 and future pandemics. These forward-looking statements are based on a variety of factors and assumptions including, but not limited to that: none of the risks identified above materialize, there are no unforeseen changes to economic and market conditions and no significant events occur outside the ordinary course of business. These assumptions are based on information currently available to Aecon, including information obtained from third-party sources. While Aecon believes that such third-party sources are reliable sources of information, Aecon has not independently verified the information, Aecon has not ascertained the validity or accuracy of the underlying economic assumptions contained in such information from third-party sources and hereby disclaims any responsibility or liability whatsoever in respect of any information obtained from third-party sources. Risk factors are discussed in greater detail in the Section 13 - "Risk Factors" in Aecon's December 31, 2022 Management's Discussion and Analysis filed on SEDAR+ (www.sedarplus.com) on February 28, 2023 and in other filings made by Aecon with the securities regulatory authorities in Canada. Except as required by applicable securities laws, forward-looking statements speak only as of the date on which they are made and Aecon undertakes no obligation to publicly update or revise any forward-looking statement, whether as a result of new information, future events or otherwise. ACCON The presentation presents certain non-GAAP and supplementary financial measures, as well as non-GAAP ratios and capital management measures disclosed to assist readers in understanding the Company's performance ("GAAP" refers to Canadian Generally Accepted Accounting Principles under IFRS). These measures do not have any standardized meaning and therefore are unlikely to be comparable to similar measures presented by other issuers and should not be considered in isolation or as a substitute for measures of performance prepared in accordance with GAAP. Management uses these non-GAAP and supplementary financial measures, as well as certain non-GAAP ratios and capital management measures to analyze and evaluate operating performance. Aecon also believes the financial measures defined below are commonly used by the investment community for valuation purposes, and are useful complementary measures of profitability, and provide metrics useful in the construction industry. The most directly comparable measures calculated in accordance with GAAP are profit (loss) attributable to shareholders or earnings (loss) per share. Throughout this presentation, the following terms are used, which do not have a standardized meaning under GAAP: "Adjusted EBITDA", "Equity Project EBITDA", "Backlog" and "Adjusted EBITDA margin." "Operating margin" and "Gross profit margin" are a supplementary financial measures. Refer to Section 4 "Non-GAAP and Supplementary Financial Measures" and Section 9 "Quarterly Financial Data" in the Company's September 30, 2023 Management's Discussion and Analysis, filed October 25, 2023 (the "Q3 2023 MD&A") for additional information regarding the non-GAAP and supplementary financial measures and non-GAAP ratios used in this presentation. Also refer to pages 17 and 27 in this presentation for additional information regarding non-GAAP ratios and capital management measures. The Q3 2023 MD&A is available on SEDAR+ (www.sedarplus.com), and the additional information regarding the non-GAAP and supplementary financial measures and non-GAAP ratios used in this presentation information in the above noted sections is incorporated by reference into this presentation. 2