The inconsistency of renewable sources like solar and wind poses a considerable challenge to grid stability, according to M Chandrasekar, former Chairman of the Tamil Nadu Electricity Regulatory Commission (TNERC). Delivering the keynote address at the 9th edition of RenewX, held on 23rd April 2025 in Chennai, Chandrasekar said, “managing this variability requires greater focus on storage and grid flexibility.” He explained that peak hours which see high consumption, typically fall between 6 pm and 10 pm during non-summer months, but in summer extends up to 2 am. Conversely, non-peak hours, usually late morning to early afternoon, see lower demand. Chandrasekar stressed that storing surplus energy generated during non-peak hours was essential and without expanding energy storage systems, it would be difficult to reach the desired levels of renewable energy mix.
The state has already laid down plans for 1,000 MWh of battery storage, with a larger target of 4,000 MWh as per recent assembly discussions. “At an estimated Rs 10 crore per MWh, investments in the range of Rs 60,000 crore will be required to meet these goals,” said Chandrasekar.
With a progressive policy framework and a massive market, Tamil Nadu is moving towards 50 per cent of renewable energy in it’s energy mix and is well-positioned to lead India’s green energy transition.