The vibe in the Fusion Hybrid is one of abiding integration: the subtle slurring of ratios in the continuously variable transmission, the share-the-load cooperation between electric and gas engine (2.0-liter, 141-hp Atkinson-cycle four-cylinder), a sort of light, transparent flickering of power sources.
Google is testing a fleet of plug-in hybrids and software that would turn them into load-balancing tools for utilities flooded with variable power from wind and solar generators.