After BMW revealed the BMW Vision EfficientDynamics Concept at the 2008 Geneva Motor Show, they are also preparing a production version X5 Hybrid for 2010. The first BMW model to benefit from the Active Hybrid system will be the 7-Series (set to be revealed in September at the Frankfurt Motor Show) followed by the X6.

The first prototypes have already been caught testing in the California. The difference between the concept revealed in the 2008 and the prototypes caught by the spy photographers is its engine. If the concept combined a diesel engine with an electric motor, the prototype was powered by a gasoline engine. But even so, BMW will also produce a diesel-hybrid powertrain, we’ll just wait to wait longer to finally see it.