Intel Capital, the corporate venturing unit of chipmaker Intel, has been investing in clean-tech for five years.

Heiko von Dewitz (pictured), Intel Capital’s clean-tech investment director, said: "We started our clean-tech investments in 2007 and focused on smart grid, distributed energy generation, solar and the supply chain and electric transportation."

Intel Capital prefers some of the sectors in which it operates in clean-tech to others. Von Dewitz said: "What I consider most attractive for Intel is energy efficiency, the smart grid and green IT. In smart grid management we think there is an analogy to telecom networks…