Section 28(1)(a) in Central Electricity Regulatory Commission (Terms and Conditions of Tariff) Regulations, 2014
(a)Coal-based/lignite-fired thermal generating stations(i)Cost of coal or lignite and limestone towards stock, if applicable, for 15 days for pit-head generating stations and 30 days for non-pit-head generating stations for generation corresponding to the normative annual plant availability factor or the maximum coal/lignite stock storage capacity whichever is lower;(ii)Cost of coal or lignite and limestone for 30 days for generation corresponding to the normative annual plant availability factor;(iii)Cost of secondary fuel oil for two months for generation corresponding to the normative annual plant availability factor, and in case of use of more than one secondary fuel oil, cost of fuel oil stock for the main secondary fuel oil;(iv)Maintenance spares @ 20% of operation and maintenance expenses specified in regulation 29;(v)Receivables equivalent to two months of capacity charges and energy charges for sale of electricity calculated on the normative annual plant availability factor; and(vi)Operation and maintenance expenses for one month.