The company also announced Friday the base price has been cut by $1,000 to $39,995, the Detroit Free Press reported. Buyers may be able to reduce the price more with a $7,500 federal tax credit.
GM has added four option packages. The 2011 Volt had been available on a more limited basis in eight states and Washington, D.C., with only three option packages.
The Volt has a 35-mile range on its battery, which is backed up by a gasoline-powered generator.
GM plans to add two shifts with 2,500 more employees at its Detroit-Hamtramck plant, where the Volt is produced.
Rob Peterson, a GM spokesman, said the top price for a Volt with all options will be $46,265.