Section 2(1)(p) in Central Electricity Regulatory Commission (Cross Border Trade of Electricity) Regulations, 2019
(p)'Control Area' means an electrical system bounded by interconnections (tielines), metering and telemetry which controls the generation and/or load within the area to maintain its interchange schedule with other control areas whenever required to do so and contributes to frequency regulation of the synchronously operating system. Each neighbouring country inter-connected with Indian Grid shall be treated as a separate control area;