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In 2012, cleantech venture investments fell by 33 percent. Some are calling it a "cleantech cliff." In reality, it's a transition period as investors figure out how to make smarter technology plays that are less capital intensive.

In this week's show, Scott Clavenna and Stephen Lacey discuss how efficiency is benefiting from this trend. Nancy Pfund, a managing partner at DBL Investors, describes how VCs are feeling about efficiency plays, and Jon Guerster, CEO of the efficiency services company Groom Energy, talks about adoption cycle trends in the commercial/industrial efficiency space.

Our weekly podcasts let you hear from industry experts, GTM research analysts, editors, reporters and other special guests. Stay tuned and thanks for listening. Don't forget to subscribe to the podcast series through iTunes.