With the Little Box Challenge, Google (and IEEE, and a few other
sponsors like Cree and Rohm) is offering a $1 million prize to the
team which can “design and build a kW-scale power inverter with the
highest power density (at least 50 Watts per cubic inch).” Going
from cooler-sized to tablet sized, they say, would make whole lot of
things better, and the prize is reserved for the best performing
entrant.
https://www.littleboxchallenge.com/