To effectively protect a ground wire running from the electric meter to the ground rod, you need to add a piece of conduit. Install a connector and a piece of pipe from the meter to the ground to protect the electric meter ground wire. Many wires have been damaged by lawnmowers and weed trimmers without protection.
Install a ground wire and connect the wire to the neutral ground terminal in the center of the meter, next to the neutral connect. In residential installations, the neutral and ground are a common connection called a neutral/ground connection. The other end of the ground wire attaches to a ground rod and is attached with a ground lug.