August 22, 2008

Bruce Hazeltine Joins GT Solar As Director of Process Development

GT Solar Incorporated, a global provider of specialized equipment and technology for the solar power industry, today announced that Bruce Hazeltine has joined the company as director of process development for its silicon group, a new role within the company. In this position, Mr. Hazeltine will undertake engineering initiatives aimed at helping customers design efficient and cost-effective Trichlorosilane (TCS) and silane gas manufacturing plants. TCS and silane are essential components of polysilicon, a key raw material utilized to produce solar cells.

"Bruce is a well-respected professional with significant expertise in the production of TCS, silane, and polycrystalline silicon," said Dave Keck, vice president of silicon development for GT Solar. "This expertise, combined with 25 years of experience in the design and operation of chemical plants, makes Bruce a valuable addition to the GT Solar team."

Mr. Hazeltine is the former chief engineer at Voltaix, a producer of high value specialty gases for the semiconductor and photovoltaic industries. In this role, Hazeltine was responsible for production capability, maintenance, safety, process development, and project engineering. He was also the primary architect for much of the company's initial registration to ISO-9001-2000. Mr. Hazeltine previously served as development project manager for Velsicol Chemical Corporation, a producer of benzoic acid and related derivatives; and a development group leader for Hemlock Semiconductor, a subsidiary of Dow Corning that produces semiconductor grade polycrystalline silicon and related hyperpure chemicals. He has led development and design efforts for many first-of-a-kind production processes as well as optimization on mature processes for many of his past employers.

About GT Solar Incorporated

GT Solar Incorporated, based in Merrimack, NH (USA), is a wholly owned subsidiary of GT Solar International, Inc. (NASDAQ: SOLR), a global provider of specialized manufacturing equipment and services essential for the production of photovoltaic wafers, cells and modules and polysilicon. GT Solar's principal products are directional solidification systems and chemical vapor deposition reactors and related equipment. For additional information about GT Solar, please visit

Forward-Looking Statement

Some of the statements that we make in this press release are forward looking in nature. These statements are based on management's current expectations or beliefs. These forward looking statements are not a guarantee of performance and are subject to a number of uncertainties and other factors, many of which are outside our control, which could cause actual events to differ materially from those expressed or implied by the statements. These factors may include our inability to manage our expansion effectively, our dependence on a small number of customers and suppliers, our limited number of products, the possibility of product liability claims, our inability to protect our intellectual property rights, increased competition from other manufacturers of equipment for PV products, risks associated with doing business in foreign countries and various other risks as outlined in GT Solar International, Inc.'s filings with the Securities and Exchange Commission. Statements in this press release should be evaluated in light of these important factors. GT Solar International, Inc. is under no obligation to, and expressly disclaims any such obligation to, update or alter its forward-looking statements, whether as a result of new information, future events, or otherwise.