Speaking to PIN, manager of NIGEC for pipeline projects, Mir-Taghi Sarafi, said the delegation is due to travel to Tehran in Aug.
He added gas price formula has been determined but the effective factors has not yet been finalized adding that the contract has been signed based on crude oil prices and some of its derivatives.
The contract will allow the European country to import 5.5 billion cubic meters of natural gas annually and it is to sign its operational agreement late this year.
He further stated on this basis, the gas will be delivered at the Bazargan border continuing that by the end of the year Swiss officials should reach an agreement with Turkish sides on permission of gas transit.
The deal between the Zurich utility Elektrizit䴳-Gesellschaft Laufenburg (EGL) and National Iranian Gas Export Company (NIGEC) would bring gas from Iran to Europe as early as next year, the Swiss company said.
The contract, worth between €10 billion (£7.8 billion) and €20 billion, was signed last week in Tehran in the presence of Micheline Calmy-Rey, the Swiss Foreign Minister, and President Ahmadinejad.
Boasting the world"s second largest natural gas reserves after Russia, it is believed that Iran may become a reliable energy supplier for Europe, helping the continent reduce its dependency on Russian gas.