Check out the help page on this topic or contact the New Connections team on 1800 680 430. They'll also be able to advise on the specific charges, which will vary depending on who your local distributor is.
Because this is a public community I need to remove the address information from your post.
What costs and time frames are involved? If you're getting a domestic gas meter removed there will usually be no cost, however you won't be able to use any gas appliances.