Tantransco flags issue of outage of NLC units, affecting load balance
Tamil Nadu Transmission Corporation Limited (Tantransco) has flagged the issue of outage of NLC generation units, resulting in shortage of the State's power allocation from Central generating stations (CGS).
Tamil Nadu is losing a share of 745 MW out of the 1,999 MW due to forced outages in May, Tantransco Chairman J Radhakrishnan said in a recent letter addressed to NLC India Ltd Chairman and Managing Director.
'In the recent past years, NLC complex units are maintaining less generation citing various reasons due to which Tamil Nadu is getting less schedule against the allocated share there by facing much hardships in maintaining its 'Load-generation' balance, ', he said.
Tamil Nadu State Load Despatch Centre is facing much hardship to maintain load-generation balance especially during non-solar peak hours, Mr. Radhakrishnan said. He called for necessary immediate measures in long term perspective to rectify the outage and maintain full generation from NLC Complex units during the current summer period especially during non-solar peak hours.
Tantransco has also pointed out that there was a schedule shortfall of 219 MW from the available running units during the lighting peak hours on May 12, resulting in total affected share of 964 MW out of 1,999 MW.
Tamil Nadu grid faces 5 peaks namely morning peak, solar peak, evening peak, lighting peak and Air-Conditioned (AC) night peak. Presently, the solar peak and evening peak is being met through renewable energy sources, namely solar and wind in addition to other generators, as per the State Energy Department's policy note for 2025-2026.
Shortage of resources is faced during the morning peak, lighting peak and AC peak especially during the months of February, March, April and May. After meeting the demand with available sources viz., Thermal, Hydro, Central Generating Stations (CGS) share, Long Term Open Access (LTOA), Medium Term Open Access (MTOA) and Renewable Energy sources, the shortage in demand is met through short term tie ups such as Day Ahead Market (DAM), Day Ahead Contingency (DAC) Market, Long Duration contract (LDC) and Real Time Market (RTM), it added.
Challenges faced in grid management are thermal outages, CGS share outages among others, the policy note pointed out.
Tamil Nadu reached an all-time high peak power demand of 20,830 MW on May 2, 2024, and the record high daily consumption of 454.32 million units on April 30, 2024. Last month, Electricity Minister S.S. Sivasankar had said Tamil Nadu's power demand so far in the current summer has been lower than last year, due to rains in parts of the State.
India's energy consumption stood at 148.7 billion units in May 2025, marking a 4% decline compared to the previous year. Unseasonal rains and the early onset of the monsoon kept temperatures lower than usual, leading to reduced electricity demand, as per Indian Energy Exchange.
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