Greentown Labs Gives Green Energy Startups the Green LightThis incubator helps green energy companies avoid going into the red.

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In late 2010, four energy entrepreneurs pooled their resources for an affordable Boston warehouse space where they could build hardware prototypes. Today that collective has ballooned into Greentown Labs—33,000 square feet of office, event and machine-shop space that incubates more than 40 energy and clean-technology startups.