Section 4(viii) in Central Electricity Regulatory Commission (Power Market) Regulations, 2010
(viii)Ancillary Services Contracts - These contracts are for ancillary services. Ancillary Services in power system (or grid) operation are support services necessary to support the power system (or grid) operation for maintaining power quality, reliability and security of the grid, e.g. active power support for load following, reactive power support, black start, etc.
