GT Solar Signs $91 Million Contract with The Silicon Mine B.V. of the Netherlands

GT Solar Incorporated, a key global provider of a comprehensive
range of equipment, services and technology solutions to the solar
power industry, announced today that it has entered into a contract to
supply The Silicon Mine B.V. (TSM), of the Netherlands, with
polysilicon reactors and converters worth approximately $91M. The
equipment will be used by TSM in conjunction with its announced plans
to launch the first solar grade silicon plant in the Netherlands,
expected to open in late 2009.

The contract is for GT Solar´s advanced technology, 48 rod,
chemical vapor deposition (CVD) reactors and silicon tetrachloride
(STC) hydrogenation conversion units used to manufacture polysilicon.
Polysilicon is the primary raw material used in the production of
solar panels worldwide.

GT Solar CEO, Thomas Zarrella, said, "We are pleased to announce
this latest contract with TSM. This contract represents the first
installation of GT Solar´s polysilicon reactors in Europe. This is
further confirmation of GT Solar´s key role in providing technology to
meet the global demand for solar energy."

TSM President Gosse Boxhoorn noted, "We are delighted to have the
opportunity to work with GT Solar as we start to build our business as
a key provider in the photovoltaic supply chain. GT Solar has the
proven resources and know-how we need to achieve our goals."

About TSM

TSM plans to open the first solar grade silicon plant in the
Netherlands in late 2009. Silicon will be produced in two adjacent
factories at TSM´s Chemelot site in Sittard/Geleen and will be
suitable for the production of wafers, the base material for the
manufacture of solar cells. For more information, go to
www.thesiliconmine.com.

About GT Solar Incorporated

GT Solar Incorporated, based in Merrimack, NH (USA), is a wholly
owned subsidiary of GT Solar International, Inc., and is a key global
provider of ingot casting furnaces, polysilicon reactors and turnkey
manufacturing solutions across the photovoltaic supply chain. For more
information, go to www.gtsolar.com.

Forward-Looking Statement

This press release contains forward-looking statements that are
subject to risks and uncertainties. These statements are indicated by
words such as "expect," "estimate," or similar expressions. In
particular, this press release contains forward-looking statements
about the expected future sales of $91 million from the contract
executed with TSM. GT Solar might not realize the expected $91 million
of revenue under the contract as the contract might be terminated
within 30 days of the commencement date in accordance with its terms.
These statements are based upon information available to GT Solar´s
management as of the date hereof. Actual results may differ materially
from the anticipated results because of certain risks and
uncertainties, including, but not limited to, the failure by either
party to fulfill its obligations under such contract. GT Solar
undertakes no obligation to update or revise forward-looking
statements to reflect changed assumptions, the occurrence of
unanticipated events or changes to future operating results over time,
except as required by law.