Greentech VC Nancy Floyd: U.S. cleantech firms must go global to thrive

Nancy Floyd was early to the greentech investing game. A prominent venture capitalist, she founded and remains the managing director of Nth Power, an early-stage venture capital fund based in San Francisco. Nth Power, a $180 million fund, has seen a number of successful exits, including companies specialized in biofuels and "smart" meters.

More than a quarter century ago, Floyd founded NFC Energy, one of the country's first wind development companies. She has also been active in non-profit energy projects, such as home audits, and sat on the Vermont Public Uitlities Commision. These days, she makes bets on the future of greentech. I sat down to talk with her in San Francisco. Here's an edited transcript of our conversation: