Aecon reports improved operating results

Ø Revenues and operating profits up

Ø Margins strengthened

Ø Increased new awards drive backlog to highest in almost four years

Ø Balance sheet strengthened

Ø Improved margins and a positive net income expected in 2006

Toronto , Ontario  – May 15, 2006: Aecon Group Inc. (TSX: ARE) today reported improved margins and operating results in the first quarter of 2006 compared to the same quarter last year.

Revenue, Operating Results and Net Income

Revenues in the first quarter of 2006 totalled $201 million, an increase of $28 million or 16% over the same period last year. This growth in revenues occurred in all segments, with the largest increase, $14 million, coming from the Industrial segment.

Gross margins (revenues less costs and expenses) as a percentage of revenues increased from 3.0% in the first quarter of 2005 to 3.2% in the current quarter.

Operating results (representing the results from operations before interest, income taxes and extraordinary items) amounted to a loss of $8.4 million, an improvement of $0.9 million from the first quarter of 2005. The improvement in operating results came largely from Industrial operations in western Canada as well as Civil and Utilities operations in Ontario.

Net loss in the quarter was $10.9 million ($0.36 per share) as compared to a loss before extraordinary items of $11.8 million ($0.40 per share) and a net loss after extraordinary items of $8.4 million ($0.29 per share) in the same quarter last year. The 2005 results included an extraordinary gain of $3.4 million after taxes.

* Operating profit (loss) represents the profit (loss) from operations before interest, income taxes and extraordinary items
Outlook

“Aecon's first quarter results confirm that the improvement we saw in 2005 is continuing,” said John M. Beck, Chairman and CEO, Aecon Group Inc. “The strength of the Canadian construction market, combined with the operational improvements now in place, should drive increased margins and a positive net income for Aecon in 2006.”

“Aecon's core markets in Canada continue to strengthen and I expect that trend to continue – potentially through the end of the decade,” said Scott Balfour, President and CFO, Aecon Group Inc. “This trend, coupled with a narrowed strategic focus on our core markets and an increased discipline in our bidding and negotiating process, is driving our margins higher and increasing the value of our backlog.”

The Cross Israel Highway, Aecon's most significant infrastructure investment to date, is performing well and traffic is ramping up as anticipated, with average weekday traffic in the first quarter of 2006 growing by approximately 14% as compared to the first quarter last year.

“With over two years of solid, steady traffic growth now proven, and the highway's reputation as a financial success growing, it may be time over the next 18 months to monetize a portion of our investment in the project,” Mr. Beck said.

Aecon's other large infrastructure investment, the Quito Airport concession, took full effect in January 2006, with financial close for construction of the new airport expected before the end of the second quarter.

Backlog and New Business Awards

New business awards in the quarter increased by $82 million over the same quarter last year, driving Aecon's backlog to $657 million at March 31, 2006, the highest it has been in almost four years ($67 million higher than at the same time last year and $80 million higher than at year end). On a segmented basis, increases of more than $100 million in each of the Infrastructure and Industrial segments since March 31 of last year offset a decline in the Buildings segment where a focus on driving margin improvement has replaced the focus on revenue growth. Backlog is expected to increase by about a further $250 million when the Quito Airport project financing closes.

Not included in backlog but important to Aecon's prospects are the expected revenues from Aecon's growing alliances and supplier-of-choice arrangements such as those in place with Expertech, Union Gas, Ontario Power Generation and Suncor. Aecon's effective backlog is therefore greater than what is reported here.

First Quarter Business Highlights

· Aecon Construction and Materials was awarded three contracts totalling $115 million for work on Highway 407 ETR, Highway 401 and for GO Transit.

· The Quito Airport concession is in full effect and the airport is now run to the financial benefit of the concessionaire.

· Aecon Cegerco strengthened its position in Quebec with a territorial expansion that includes Quebec City.

· Aecon Industrial was awarded three significant contracts for work at Ontario Power Generation plants and also secured three contracts in Alberta valued at approximately $40 million from Petro Canada, Canadian Natural Resources Limited and Jacobs Canada.

· Innovative Steam Technologies was awarded a $7 million contract to supply two Once Through Steam Generators for a combined cycle cogeneration power plant in Bronx, New York.

· Aecon issued 4,680,000 common shares in March and April resulting in net proceeds of $27.7 million to further strengthen its balance sheet.

Segmented Results

Aecon reports its results in three segments: Infrastructure, Buildings and Industrial.

Ø  Infrastructure

The Infrastructure segment includes all aspects of civil construction from highways, bridges and tunnels to airports, marine facilities, transit and power projects as well as utilities construction and infrastructure development.

Revenues from the Infrastructure segment increased from $58 million in the first quarter of 2005 to $62 million this quarter, as revenue gains of $8 million from roadbuilding operations, $4 million from utilities operations and $3 million from heavy civil operations offset revenue declines of $12 million from the Quebec operations.

Despite the increase in revenues, operating results from the Infrastructure segment were $0.6 million behind the same quarter last year, primarily as a result of a claim settlement recorded in the first quarter of 2005 and the completion last year of construction work on the Cross Israel Highway.

Ø  Buildings

The Buildings segment includes all aspects of Aecon's commercial, institutional and multi-unit residential building construction and renovation activities.

Revenues in the Buildings segment increased to $87 million in the quarter, a $10 million increase over the first quarter of 2005. Revenue increases totalling $9 million were recorded by the segment's Seattle and western Canada operations, while revenues climbed $2 million in the Greater Toronto Area. Partially offsetting these increases were small declines in revenues from the division's Ottawa operations and Montreal operations.

Operating results for the first quarter of 2006 declined $0.7 million compared to last year, largely due to a $0.8 million write down of an investment in a joint venture and reduced profit margins on some current projects in the Toronto area where pending change order settlements have not been finalized. Operating results are expected to improve through the balance of the year, as the impact of strategic efforts to improve the financial performance of these operations takes hold. Consistent with the increases in revenues, operating profits from the segment's Seattle and western Canada operations increased. Results from the segment's Montreal and Ottawa operations increased slightly.

Ø  Industrial

Industrial operations include all of Aecon's industrial manufacturing and construction activities from in-plant construction in the nuclear and cogeneration sectors to the fabrication of specialty pipe and modules for the oil and gas sector and the design and manufacture of Once Through Steam Generators.

Revenues in the Industrial segment increased by $14 million to $53 million, a 36% improvement over the same quarter in 2005. Revenues from the segment's western Canada operations jumped $17 million to $25 million on strong demand from oilsands projects, while revenues from industrial construction operations in Ontario increased $2 million from the same quarter last year. Revenues of $3 million from Innovative Steam Technologies (“IST”) were a $5 million decline from last year.

Quarterly operating profit of $0.5 million from the Industrial segment represented a $2.9 million improvement over the same quarter in 2005. Consistent with the increase in revenues noted above, operating profits from western Canada operations of $2.8 million were $3.5 million higher than last year. Despite the increase in revenues, industrial construction operations in Ontario fell $0.4 million due to delays in anticipated awards and customer delays on existing projects. IST recorded operating losses of $1.2 million, a $0.2 million increase over the same quarter last year.

Ø  Corporate and Other

Net Corporate expenses for the quarter were $3.2 million compared to $2.5 million in 2005.

Consolidated Results

The Consolidated Results for the first three months of 2005 and 2006 are available at the end of this News Release.

Balance Sheet Highlights

 Conference Call

A conference call has been scheduled for Monday, May 15, 2006 at 10:30 a.m. ET to discuss Aecon's First Quarter 2006 financial results. Participants should dial 416-620-2417 or 1-877-871-4101 at least 10 minutes prior to the conference time of 10:30 a.m.

For those unable to attend the call, a replay will be available after 12:30 p.m. at 1-800-558-5253 or 416-626-4100 until midnight, May 22, 2006. The pass code will be 21285300#.

About Aecon

Aecon Group Inc. is Canada's largest publicly traded construction and infrastructure development company. Aecon and its subsidiaries provide services to private and public sector clients throughout Canada and internationally.

Consolidated Statements of Operations for the three months ended March 31, 2006 and 2005

(in thousands of dollars, except per share amounts) (unaudited)