The move would help in having a benchmark in deciding the escalation rates for electricity generated by power plants that are fired by Indonesian coal.
It also assumes significance amid deadlock between various power generators and procurers over increasing the electricity tariff due to rise in imported coal prices.
The Central Electricity Regulatory Commission (CERC) has decided to include Indonesian coal, besides South African and Australian dry fuel, in the composite index for imported coal for payment purposes.
The Commission said the decision to revise the index has been taken after considering the composition of steam coal imports as well as the importance and acceptability of indices in international contracts.
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"The weights of different coal in the composite index shall include 25 per cent Australian coal, 25 per cent South African coal, and 50 per cent Indonesian coal," the Commission said in an order dated December 23.
CERC has the mandate to notify the escalation rates for imported coal used to fire power plants. These rates are notified every six months.
In 2010-11 period, about 73 per cent coal was imported from Indonesia while 24 per cent was from South Africa.
Average import of steam coal for the last three years shows about 76 per cent from Indonesia and 19 per cent from South Africa. During the same period, the dry fuel import from Australia was just about one per cent.
Despite insignificant steam coal imports from Australia, it would have 25 per cent weightage in the index.
The new index should be used to determine the escalation rates from April 1, 2014.
Regarding suggestions for country specific indices, CERC said that reliability could be an issue in such cases.
"The rationale for using composite index instead of country specific index is to induce efficiency in procurement and diversification of supplies," the order said.
Further, the regulator noted that the composite index would be subject to review and revision "as and when the need arises".