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California Clean Tech Open names 44 finalists

Judges of the "start-up in a box" prize for fledging green-tech companies will narrow the finalists down to six winners by November.

The California Clean Tech Open, dubbed the "start-up in a box" contest, named 44 finalists Tuesday. It awards $100,000 in cash, office space, and professional services to each of the six winners. Categories are air, water, and waste; energy efficiency; green building; renewables; smart power; and transportation.

The Google-sponsored contest, run by the nonprofit Acterra, touts success stories such as GreenVolts, which makes photovoltaic solar concentrating systems, and BuildFast, which sells eco-friendly house kits for developing regions. Contest organizers said that tech for the developing world has become an increasing area of focus.

Prizes are due to be announced November 6. Click here for a list of the finalists.