Washington Group International Awarded New Hampshire Clean Air Project

BOISE, Idaho and PRINCETON, N.J. (Oct 03, 2007) — Washington Group International (NYSE: WNG) announced today that it has been awarded a cost-reimbursable contract by Public Service of New Hampshire (PSNH) for its Clean Air Project at its 478-megawatt Merrimack Station power plant in southern New Hampshire.

Washington Group will provide engineering, procurement support, and construction management services for the installation of a flue gas desulfurization (scrubber) system that will service the plant’s two fossil-fuel-fired units. The scrubber system will be designed to primarily remove mercury from the flue gas with the additional benefit of reducing sulfur emissions from the plant.

The scrubber system will work simultaneously with an existing selective catalytic reduction system on each of the plant’s two units, substantially reducing station emissions. When the project is complete, the plant will comply with New Hampshire’s new mercury emissions limitations as well as the federal Clean Air Mercury Rule.

“Washington Group is pleased to work with Public Service of New Hampshire as it continues to implement its progressive environmental program,” said Lou Pardi, president of the company’s Power Business Unit, headquartered in Princeton, N.J. “We will provide the required resources and clean air expertise-including our proven ability to install a single flue gas desulfurization system to service two units. We look forward to working together with PSNH to reduce emissions at this vital plant.”

As a wholly owned subsidiary of Connecticut-based Northeast Utilities, PSNH is an integral part of New England’s electric system and is the largest electric utility in New Hampshire, serving more than 490,000 homes and businesses. Formed in 1926, PSNH has grown to comprise five multi-fuel capable fossil-fuel-fired generating units, nine hydroelectric facilities, and one biomass-fired unit, jointly capable of generating more than 1,110 megawatts of electricity. This diverse supply of low-cost energy provides the foundation for continued economic growth and prosperity in New Hampshire.

About the Company

Washington Group International (NYSE: WNG) provides the talent, innovation, and proven performance to deliver integrated engineering, construction and management solutions for businesses and governments worldwide. Headquartered in Boise, Idaho, with more than $3 billion in annual revenue, the company has approximately 25,000 people at work around the world providing solutions in power, environmental management, defense, oil and gas processing, mining, industrial facilities, transportation and water resources. For more information, visit http://www.wgint.com.

Forward-Looking Statements

This news release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, which are identified by the use of forward-looking terminology such as may, will, could, should, expect, anticipate, intend, plan, estimate, or continue or the negative thereof or other variations thereof. Each forward-looking statement, including, without limitation, any financial guidance, speaks only as of the date on which it is made, and Washington Group undertakes no obligation to update any forward-looking statement to reflect events or circumstances after the date on which it is made or to reflect the occurrence of anticipated or unanticipated events or circumstances. The forward-looking statements are necessarily based on assumptions and estimates of management and are inherently subject to various risks and uncertainties. Actual results may vary materially as a result of changes or developments in social, economic, business, market, legal, and regulatory circumstances or conditions, both domestically and globally, as well as due to actions by customers, clients, suppliers, business partners, or government bodies. Performance is subject to numerous factors, including demand for new power generation and for modification of existing power facilities, public sector funding, demand for extractive resources, capital spending plans of customers, and spending levels and priorities of the U.S., state and other governments. Results may also vary as a result of difficulties or delays experienced in the execution of contracts or implementation of strategic initiatives. For additional risks and uncertainties impacting the forward-looking statements contained in this news release, please see “Note Regarding Forward-Looking Information” and “Item 1A. Risk Factors” in Washington Group’s annual report on Form 10-K for fiscal year 2006.

CONTACTS:

Jerry Holloway or Laurie Spiegelberg, Washington Group International, +1-208-386-5255

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