Venkat Srinivasan has a relatively short list of requirements when shopping for a car. With a young baby at home, safety is important. “My wife is very clear,” he says. “We want to have a car where I can put my baby in the center seat in the back.” He also needs a fair amount of trunk space for all the baby gear. But what Srinivasan really wants is an environmentally friendly, plug-in hybrid. And that has been a problem.