Turkmenistan is believed to have the world's fourth-largest gas reserves, but currently exports almost all of it to China.
Turkmen President Gurbanguly Berdymukhamedov yesterday discussed the new pipeline in a phone call with Afghan President Ashraf Ghani, who hailed it as "extremely important for the entire region."
Ghani has accepted Berdymukhamedov's invitation to attend a ground-breaking ceremony marking the start of its construction on December 13.
TAPI, as the proposed 1,735-kilometre pipeline is known, is intended to carry 33 billion cubic meters of gas annually through the Afghan cities of Herat and Kandahar and end up in the India-Pakistan border town of Fazilka.