The original plan (which was suggested two decades ago) was to transfer Iranian gas to India through Pakistan. If this project was implemented, it would have been immensely beneficial for Pakistan, as they will get billions of USD in transit fees in addition to extremely cheap Iranian natural gas. It got stuck after the terrorist incidents in India and as the relations between both the countries got cold. Iranian gas gets wasted (flared) now, as they don't have any pipelines or LNG terminals to export it to other countries.