Section 34(1)(c) in Central Electricity Regulatory Commission (Terms and Conditions of Tariff) Regulations, 2019
(c)For Hydro Generating Station (including Pumped Storage Hydro Generating Station) and Transmission System:(i)Receivables equivalent to 45 days of annual fixed cost;(ii)Maintenance spares @ 15% of operation and maintenance expenses including security expenses; and(iii)Operation and maintenance expenses, including security expenses for one month.