Tetra Tech, Inc. (NASDAQ: TTEK) announced today it has been awarded a $350 million contract to provide technical assistance for the U.S. Agency for International Development (USAID) clean energy development program worldwide. Seven companies, including three small businesses, will share in the indefinite delivery/indefinite quantity (ID/IQ) contract value. The contract has a five-year ordering period. Tetra Tech will help USAID address the growing demand for, and use of, clean energy services in developing countries by designing clean energy strategies. Tetra Tech will help improve governance structures to support clean energy development, assess the environmental implications of energy policies, and help foster private sector participation and investment in clean energy. Tetra Tech will also assist USAID in its efforts to reduce global warming by promoting the sustainable use of renewable energy technologies, energy efficient technologies, and carbon sequestration. The contract includes provisions for improving foreign national and local government capacity in the energy sector to prepare for and respond to natural or man-made disasters. About Tetra Tech ( www.tetratech.com) Tetra Tech is a leading provider of consulting, engineering, program management, construction management, and technical services. The Company supports government and commercial clients by providing innovative solutions to complex problems focused on water, environment, energy, infrastructure, and natural resources. With more than 14,000 staff 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.