Tetra Tech Awarded $40 Million EPC Wind Energy Project

Tetra Tech, Inc. (NASDAQ: TTEK) announced today that it has been awarded a $40 million contract to design and build a 152-megawatt (MW) wind farm outside of Woodward, Oklahoma. Tetra Tech will provide engineering-procurement-construction (EPC) services to CPV Keenan II Renewable Energy Company, LLC for the Keenan II Wind Farm. Tetra Tech previously completed the upfront environmental and permitting work for this project.

Siemens will furnish and erect 66 2.3-MW turbines for the Keenan II Wind Farm. Tetra Tech is responsible for all other aspects of the wind farm design and construction, including electrical collection, transmission lines, grid connection, and wind turbine foundations.

The new Keenan II Wind Farm will be located adjacent to the OU Spirit Wind Farm, a 44-turbine wind farm that Tetra Tech recently completed.

About Tetra Tech (www.tetratech.com)

Tetra Tech is a leading provider of consulting, engineering, program management, construction, and technical services addressing the resource management and infrastructure markets. The Company supports government and commercial clients by providing innovative solutions focused on water, the environment, and energy. With approximately 10,000 employees worldwide, Tetra Tech’s capabilities span the entire project life cycle.

Any statements made in this release that are not based on historical fact are forward-looking statements. Any forward-looking statements made in this release represent management’s best judgment as to what may occur in the future. However, Tetra Tech’s actual outcome and results are not guaranteed and are subject to certain risks, uncertainties and assumptions ("Future Factors"), and may differ materially from what is expressed. For a description of Future Factors that could cause actual results to differ materially from such forward-looking statements, see the discussion under the section "Risk Factors" included in the Company’s Form 10-K and 10-Q filings with the Securities and Exchange Commission.