"The decline in the under-recoveries which is the difference between the market price and the price set by the government will be led by a drop in under-recoveries for diesel, due to the gradual increase," it said.
The price of diesel has increased at average Rs 4.1 per litre in the first quarter of the fiscal against Rs 8.5 last fiscal. The rating agency said the only risk to this assumption is sharp rise in the global oil prices.
This apart, the key developments to watch out for are the policies adopted by the new government and any increase in the share of under-recoveries that upstream companies may have to bear, it said.
In the run-up to the budget to be presented by Finance Minister Arun Jaitley the day after, analysts have been saying fuel subsidies are on the way down but subsidies on fertilisers and food need to be watched out for.
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Reinstatement of subsidy transfers through the direct benefit transfer, halted in March, will also reduce the under-recoveries of oil marketing firms and reduce subsidy burden on explorers.
Once diesel is fully deregulated, private players like Reliance Industries and Essar Oil will also be interested in its marketing and this will create a level playing field, it said.
On the rating impact of the reduction in under recoveries, it said this bodes well for the state-run oil refiners and marketers like IndianOil, Bharat Petroleum and Hindustan Petroleum.