India’s Record 270-GW Peak Power Demand Sparks Focus on Urban Heat Dynamics – Indian PSU

India has been witnessing earlier, longer, and more intense heatwaves over the past few years, driven largely by human-induced climate change. But rising temperatures alone do not explain why cities and towns are becoming increasingly unlivable during summers. Rapid urbanization is significantly amplifying heat stress, turning Indian cities into giant heat traps and driving a sharp rise in electricity demand.

Rapid Urbanization, which modifies land use and land cover (LULC) is behind the elevated temperature over the cities and towns, and they experience a phenomenon known as Urban Heat Island (UHI). The UHI phenomenon significantly affects us by exacerbating heat discomfort, increased energy consumption, and urban air pollution. The severity of UHI associated with heat waves and heat stress-related mortality is now one of the major concerns, particularly in densely populated cities. The observed UHI intensity varies across the country between 2 and 10 °C, with northwest India seeing a more pronounced temperature gradient.

UHI is now the primary driving factor of power demand in the country. While industrial power demand has remained relatively stable in several regions, residential demand has surged sharply because cities are becoming significantly hotter, especially during evenings and nights, forcing households to rely more heavily on cooling appliances such as air-conditioners, coolers, and fans. Air conditioners, the usage of which is rising every year at an astronomical rate, is also a key culprit in rising UHI. It is projected to cover up to 40% of households by 2030.

Key Highlights
● India hit a record peak power demand of 270 GW amid the ongoing heatwave spell.
● Residential cooling demand is now overtaking industrial power demand growth.
● Uttar Pradesh recorded higher power demand than several industrial states.
● Air-conditioner use could reach 40% of Indian households by 2030.
● Air-conditioners are worsening Urban Heat Island (UHI) effect through waste heat emissions
● Humidity is sharply increasing “feels-like” temperatures and cooling demand.
● Compound hot-humid days in India jumped from 14,086 to 16,970 in a decade.
● UHI intensity across Indian cities ranges between 2°C and 10°C.
● Indian cities are becoming giant heat traps due to rapid urbanization.
● Urban heat is flattening the normal fall in evening electricity demand.
● Rising night temperatures are emerging as silent killers during heatwave as it is extending cooling demand well past midnight.
● Cool roofs, rooftop solar, and green infrastructure are critical heat solutions.

Non-industrial states such as Uttar Pradesh have much higher power demand than states with mega energy guzzling manufacturing zones, indicating residential cooling is the catalyst of India’s 270-gigawatt record breaking peak power demand. According to the 2011 Census data, nearly 31% of India’s population resides in urban areas, contributing 63% of the country’s gross domestic production. By 2030, approximately 40% of India’s population would likely reside in urban areas and contribute 75% of the country’s GDP. Urbanization, in conjunction with UHI impacts in metropolitan areas, significantly changes local and regional climates, contributing to weather extremes such as higher temperature anomalies, thermal stress, and frequent and protracted heat waves extending as late as midnight.

Demand from cooling – both commercial and residential which starts from noon and doesn’t come down till wee morning hours has put grid planning in a knot. When India touched 270 GW last week, solar power was the second largest source in the supply mix contributing 80 GW, approximately 22% of the total electricity. But as the sun goes down, this 80 GW disappears and the grid has to scale up conventional sources. These conventional fuels run during the day time to support the injection of renewable energy sources and evening onwards are the only source of power.

To manage heatwave record high demand days, the Indian grid is pulling out all the stops. But heat is making the grid planners rewrite their plans and combined with ever rising RE
injection, the grid is swinging between two strong push and pull. The problem is exacerbated by the weak infrastructure in the states which are currently the highest demand generator and have low RE absorption.

India’s record 270-GW peak power demand on May 21 reflects the growing impact of urban heat, rising night temperatures and humidity on electricity consumption patterns. A recent study covering 32 Indian cities found that rapid urbanisation and shrinking green cover are intensifying Urban Heat Island (UHI) effects, especially across the Indo-Gangetic Plains.

The number of compound hot-and-humid days increased sharply from 14,086 during 2015–2019 to 16,970 during 2020–2024, with 2024 recording the highest count in the decade.

States such as Uttar Pradesh, Tamil Nadu, Bihar, Gujarat, Odisha and West Bengal — among the biggest contributors to India’s electricity demand — are also witnessing the highest rise in hot and humid days. On May 21, these states accounted for nearly 60% of India’s total power demand.

The report highlights that warmer nights are becoming a major driver of sustained electricity consumption, as air-conditioners and cooling systems continue operating for longer durations. India’s average night-time temperature has risen by around 0.21°C per decade between 2010 and 2024.

Humidity is also increasing “feels-like” temperatures, particularly in coastal and monsoon-influenced cities, pushing households towards greater dependence on mechanical cooling.

The study warns that Urban Heat Island effects are raising peak electricity demand, stressing city-level power infrastructure and worsening energy inequality. It recommends solutions including cool roofing, green infrastructure, rooftop solar, energy storage, smart grids and energy-efficient technologies.

The writer of this article is Dr. Seema Javed, an environmentalist & a communications professional in the field of climate and energy