A 'smart glass' bet

When librarians arrive at the Century College science library, one of the first decisions of the day is whether to hit an electrical switch. Not for the lights -- for the windows.

The glass is manufactured by Sage Electrochromics Inc., a 100-employee company in Faribault, Minn., that sees bright days ahead for the green technology.

Though the market for smart glass remains small, Sage is investing $135 million to expand its five-year-old Faribault plant. It intends to mass-produce its trademark SageGlass, cut the cost in half and boost sales across the world thanks to a new partnership with an international construction-materials company.

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