Measures to mitigate the risks on the power system under Clauses (2) and (3) of the Regulation 30 of the Central Electricity Regulatory Commission (Indian Electricity Grid Code) Regulations 2023.

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2025 Supreme(Online)(CERC) 57

CENTRAL ELECTRICITY REGULATORY COMMISSION
Shri Jishnu Barua, CJ, Shri Ramesh Babu V., J, Shri Harish Dudani, J, Shri R.S. Dhillon, J
Measures to mitigate the risks on the power system under Clauses (2) and (3) of the Regulation 30 of the Central Electricity Regulatory Commission (Indian Electricity Grid Code) Regulations 2023.

Order

Background:

1. Grid-India, vide its letter dated 17.09.2024, submitted a Report to the Commission on high-frequency operation on 4^th, 11^th, and 25^th August 2024. Grid-India, in its report, submitted that persistent high-frequency operation was observed on the 4^th, 11^th, and 25^th of August 2024 in India’s power system, with frequency remaining above 50.05 Hz for around 26%, 33%, and 38% of the time during the day, respectively. The key highlights with regard to high frequency of the grid on 4^th, 11^th and 25^th August 2024 are as under:

Metric	04 Aug 2024	11 Aug 2024	25 Aug 2024
% of time frequency remained above 50.05 Hz	26.27	33.32	37.97
Duration of continuous high frequency (>50.05 Hz) in minutes	226	120	258
Maximum instantaneous frequency (Hz) and its time of occurrence (hh:mm)	50.39 (12:02)	50.33 (13:44)	50.38 (13:07)

2. As per Grid-India’s Report, the contributing factors for high-frequency operation in the Indian power system on 04, 11, and 25 August 2024 are listed below:

a) Suppressed demand due to widespread rains and weekend b) Over-injection by VRE sources c) Limited flexibility from hydropower stations and pumped storage plants due to high inflows and high reservoir levels d) Inadequat

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