Gadkari said India wants the supply at USD 1.5 per mmBtu rate, while Iran has offered it at USD 2.95.
"Now we are negotiating. The Prime Minister has set up a panel under my leadership to negotiate with Iran on lowering the rate for supplying gas. If they offer to supply gas at USD 1.5 per mmBtu rate, we will promise them Rs 1 lakh crore," he said.
"In next two to three days, various ministries will give their reports (to develop Chabar port). After that we plan to visit Iran and meet government officials there," he said in an interaction with students of IIMB at the inauguration of 'Vista 2015' here.
With US and other western nations easing up on sanctions against Iran, India has been in talks with the Gulf nation to set up a gas-based urea plant at Chabahar and also develop a gas discovery made by ONGCBSE.
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"You can understand if you are making urea with the cost of 15 dollars then you can imagine if it is made in 1.5 dollars what will be the cost? If we could be able to produce urea at the rate of 1.5 dollars we can save Rs 80,000 crore of the subsidy - we don't need to give it farmers. The cost of urea will be reduced by 50 per cent," he said.
Gadkari had visited Tehran in May and both nations had signed an agreement to develop Chabahar port. Iran's Foreign Minister Mohammad Javad Zarif had also called on Gadkari in August.