India's electricity system is facing growing stress from surging nighttime cooling demand as extreme heatwaves, rising incomes, and rapid air conditioner adoption drive record power consumption, the International Energy Agency said in a note on Wednesday.
IEA strategists said electricity demand in India has been growing about 5% per year since 2019, supported by economic expansion and population growth.
The analysts said peak demand reached 270 gigawatts on May 21, up from about 180 GW in 2019, reflecting one of the fastest sustained increases globally.
The IEA said the challenge is shifting to nighttime hours, when solar generation drops while air-conditioning demand remains elevated. Cooling can account for up to one-third of electricity consumption on hot summer nights, as temperatures remain high after sunset.
Average nighttime temperatures in India are rising at about twice the rate of daytime temperatures, amplified by climate change and the urban heat island effect in densely built-up cities.
The IEA said extreme heatwaves in northwest and central India in May saw daytime temperatures reach up to 48 degrees Celcius, further driving electricity demand.
Though solar photovoltaic capacity has expanded rapidly, accounting for about two-thirds of generation capacity additions since 2019, the technology cannot support evening and overnight peak demand.
India added a record 50 GW of solar capacity in 2025, helping meet daytime consumption but leaving a gap during peak "net load" hours around 8 p.m.
"India's summer peak net load typically occurs around 8 p.m., and it declines slowly through the early hours of the morning," the IEA said, adding that net load at 4 a.m. is only about 10% below peak levels, highlighting persistent overnight demand.
Renewable energy supplied about one-quarter of electricity at peak demand on May 21, while coal remained the backbone of system reliability. India's coal fleet provided 45 GW of ramping flexibility and reached about 92% of available capacity at peak.
However, the IEA said India's system is operating with tight reserve margins, with dispatchable capacity running close to 90% of availability during peak periods, leaving limited buffer for outages or demand spikes.
The IEA said cooling demand is projected to more than double by 2035 under current policy settings, with air conditioning penetration still at about 20% of households. Cooling already accounts for just over 10% of India's annual electricity use.