Today is the last day of exhibits at Solar Power International, the United States' largest solar show, and as mentioned previously, the place is bustling and the mood is cautiously optimistic.

Here's one reason for that optimism – Suntech's Building Integrated Photovoltaics (BIPV) business is worth more than $100 million.

BIPV  was not really a category a few years ago. Today Suntech is doing big business in this emerging solar sector along with smaller firms like Lumeta and Open Energy.

BIPV has been a notoriously difficult product to sell. Most people understand the value in BIPV but establishing a sales channel has proven daunting. Now Suntech and others seem to have it figured out. 

Get the rest of the story at Green Light