Saab Unveils BioPower Hybrid 9-3

General Motors Corp.’s Saab Automobile unit unveils its new BioPower Hybrid Concept at the Stockholm Motor Show.

Based on a Saab 9-3 convertible running on a combination of pure E100 bioethanol fuel and a pair of electric motors, the concept is billed as the first fossil-free and convertible hybrid electric vehicle (HEV), the auto maker says.

The concept also is the first project ...