Get ready for the electric Cadillac

General Motors has officially given the green light to an electrically driven Cadillac called the ELR.

The ELR, which was called the Converj as a concept car, will use the same powertrain system as the Chevy Volt. The car will have a lithium ion battery pack and electric motor to propel the car. When the batteries are running low, a 4-cylinder gas engine kicks in and recharges the battery.

GM said yesterday that development of the ELR is just under way. It will announce details on timing and price later today..

The ELR is a two-door luxury coupe that combines "electric propulsion with striking design and the fun of luxury coupe driving," Don Butler, vice president of Cadillac marketing, said in a statement.