Fisker Karma

Fisker Karma

Jonathan Alcorn/Bloomberg

The solar panel rooftoop of a Fisker Karma luxury plug-in hybrid vehicle. Competitors include the Porsche Panamera S Hybrid ($96,000), the BMW ActiveHybrid 750i ($97,900), the $130,800 Maserati Quattroporte and even the $210,000-plus Aston Martin Rapide.