Evergreen Solar developed the String Ribbon technology to reduce the overall use of silicon in the manufacturing process. Unlike traditional silicon wafers that are grown and then sliced, Evergreen produces their wafers in a furnace.

With no slicing involved they are able to instantly save on raw material cost and reduce waste. When compared to traditional methods of creating the silicon ingot then slicing the wafers, the String Ribbon technology uses one-third the amount of silicon in the production process. With an ever increasing demand for silicon by PV manufacturers, some experts have warned that supply for this material won't keep pace with demand.

By developing the String Ribbon process Evergreen has helped off-set any future shortages in their production cycle which should mean they will be around for some time. Because onsite power generation technology like PV modules is still a relatively risky enterprise, business stability is a concern for homeowners, especially where warrantees are concerned.
 
Besides using fewer resources and generating a smaller carbon footprint in production, String Ribbon technology allows Evergreen to build more versatile shaped wafer which allows for a higher wattage generation to size ratio. The Spruce Line offers modules with outputs ranging from 170 to195 watts starting at $789 for the lower wattage model and run up to $939 for the 195 watt model. Modules weigh about 40 pounds each and measure about 38 inches by 62 inches and are manufactured in the United States.