Soros Fund Management and Google Ventures are among the heavy hitters that are lining up to pump capital into Transphorm, a startup that revealed technology in February that it says has the potential to significantly cut power losses and boost efficiency across the energy grid. The company, which is developing a power-conversion method that relies on gallium nitride instead of silicon, has raised $63 million since 2007. According to the U.S. Department of Energy, 80% of the nation's electricity by 2030 will run through power-electronics systems such as that being developed by Transphorm.

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