Trinasolar

SILICON

Trina Solar procures high purity polysilicon for a significant portion of its feedstock. In addition to using this high purity polysilicon directly from silicon manufacturers, Trina Solar has developed proprietary formulas to utilize silicon that is otherwise discarded by other solar and electronics manufacturers. This unique capability allows Trina Solar to have access to a broader amount of feedstock than other companies. We test and categorize reclaimable silicon raw materials based on their technical properties. These reclaimable silicon raw materials then undergo mechanical grinding and chemical cleaning before they are mixed using our proprietary formula. Our ability to mix the materials in the right proportion is critical to the production of high-quality silicon ingots. In the first quarter of 2008, our average silicon usage was approximately 7.2 grams per watt.

INGOT

Unlike most solar cell and module players, Trina Solar produces its own ingots internally. We began manufacturing monocrystalline ingots in August 2005 with pulling machines .This allows Trina Solar to tightly control the quality of its products, optimize its processes for its polysilicon supply, and capture a higher level of profit from each kilogram of polysilicon. To produce monocrystalline silicon ingots, silicon raw materials are first melted in a quartz crucible in the pulling furnace. Then, a thin crystal seed is dipped into the melted material to determine the crystal orientation. The seed is rotated and then slowly extracted from the melted material which solidifies on the seed to form a single crystal. We began commercial production of multicrystalline ingots in November 2007. To produce multicrystalline ingots, molten silicon is changed into a block through a casting process in a Directional Solidification System (DSS) furnace. Crystallization starts by gradually cooling the crucibles in order to create multicrystalline ingot blocks. The resulting ingot blocks consist of multiple smaller crystals as opposed to the single crystal of a monocrystalline ingot.

WAFER

Efficient wafer sawing requires the careful optimization of numerous variables, including machine speed, wire tension, slurry composition, and temperature level. Trina Solar optimizes its wafer sawing process to match its ingot production and feedstock supply while producing wafers that match industry benchmarks for wafer quality and thickness. Trina Solar works closely with Meyer Burger, an industry leader in wafer sawing equipment, to improve the sawing process and thus ensure the quality of the wafers while maximizing silicon use.

Currently, we slice monocrystalline wafers to a 180 micron thickness and multicrystalline wafers to a 200 micron thickness, while maintaining a low breakage rate. After the ingots are inspected, monocrystalline ingots are squared by squaring machines. Through high-precision cutting techniques, the squared ingots are then sliced into wafers by wire saws using steel wires and silicon carbon powder. To produce multicrystalline wafers, multicrystalline ingots are first cut into pre-determined sizes. After a testing process, the multicrystalline ingots are cropped and the usable parts of the ingots are sliced into wafers by wire saws by the same high-precision cutting techniques as used for slicing monocrystalline wafers. After being inserted into frames, the wafers go through a cleansing process to remove debris from the previous processes, and are then dried. Wafers are inspected for contaminants and packed and transferred to our solar cell production facilities.

CELL

We currently produce our own solar cells for use in our solar modules. After we installed our ingot and wafer production lines, we began manufacturing ingots and wafers in-house and outsourced the fabrication of solar cells to solar cell manufacturers. To reduce our dependence on third-party solar cell manufacturers and to increase our efficiencies both in solar cell and solar module manufacturing, we began the production of monocrystalline cells in April 2007 and achieved an average conversion efficiency of 16.8% as of December 31, 2007. In November 2007, we began producing multicrystalline cells and achieved an average conversion efficiency of 15.6% as of December 31, 2007. We currently have ten production lines with an annual manufacturing capacity of 250 MW. We plan to increase our annual manufacturing capacity to 350 MW by adding four additional lines by the end of 2008.

To manufacture solar cells, the crystalline silicon wafer is used as the base substrate. After cleaning and texturing the surface, emitter is formed through a diffusion process. The front and back sides of the wafer are then isolated using the plasma etching technique, the oxide formed during the diffusion process is removed and thus an electrical field is formed. We then apply an anti-reflective coating to the surface of the cell using plasma enhanced chemical vapors to enhance the absorption of sunlight. The front and back sides of the cell are screen printed with metallic inks and the cell then undergoes a fire treatment in order to preserve its mechanical and electrical properties. The cell is tested and classified according to its parameters.

MODULE

We began module manufacturing in November 2004. We increased our annual manufacturing capacity of modules from 6 MW per year as of November 2004 to 150 MW per year as of December 31, 2007. We currently have 26 production lines, and plan to increase our annual capacity to 350MW by adding an additional 14 lines by the end of 2008.

Module assembly involves electrically connecting strings of cells, laminating the strings in a durable, clear polymer material with special properties called EVA, and protecting the cells from physical stress by enclosing the laminate in an aluminum frame with a glass front and normally with a backing material known as TPT, a combination of Tedlar and Polyesther. A junction box and a set of connection cables on the back of a module allow the easy connection of one module to another at the site of installation.

Trina Solar converts its solar cells into highly quality modules at competitive costs by manufacturing in a fully integrated plant in China with highly skilled and well-trained labor. Trina Solar applies advanced quality manufacturing techniques to ensure that its modules comply with international standards including ISO 9001. Trina Solar has obtained its IEC 61215, TUV safety class, CE and UL certifications for its core modules.

Trina Solar produces and commercializes a wide variety of PV modules, both monocrystalline and multicrystalline with power output from 165W to 230W. Trina Solar's biggest customers are world class, sophisticated systems installers, wholesalers and distributors primarily in Europe, North-America and Asia.

SYSTEM

Trina Solar has a competitive advantage in this sector given its long history in system integration. In addition to having a system integration business in China, Trina Solar's experience in this business provides additional opportunities to develop and sell high quality modules to the top systems integrators around the world.

Systems installation covers a broad range of possible PV applications, from utility-scale PV, to commercial and residential rooftops, to building integrated photovoltaic (BIPV), to off-grid industrial and residential systems in rural areas. Each category presents its own unique challenges for cost-effectively deploying PV solar modules.

In China, Trina Solar has designed and installed PV systems used in off-grid applications such as outdoor urban public facilities, farms, and villages, as well as in geographically remote telecommunications and transportation systems. The first installation took place in 2002 in Tibet with the installations of 39 solar power stations for the Chinese National Brightness Program. Trina Solar has been engaged in other system integration projects since then.