GT Solar notches another big order

GT Solar has signed two new Asian customers for orders totaling $81.7 million, driving the company’s stock price at one point to an all-time high before retreating the next day.The Merrimack-based maker of equipment and materials used to make solar sells and LED lighting, said on Tuesday that the latest order would be included in its backlog in the first quarter of fiscal year 2012, which ended July 2.The orders include equipment used to make the materials for solar cells.Last month, GT received its largest single order ever, a $460 million deal from a Chinese company for its furnaces used to produce sapphire crystals used in LED lighting.GT Solar’s stock closed at $17.11 on Tuesday, although the price dipped to $16.75 on Wednesday. Last year at this time, the shares were trading for a little more than $5.50 a share. — BOB SANDERS/NEW HAMPSIHRE BUSINESS REVIEW