Key facts
- India's cities are experiencing a more than 20% surge in compound hot-humid days over the past decade, intensifying heat stress.
- Urban Heat Island intensity in Indian cities ranges from 2°C to 10°C, exacerbating heat.
- Peak electricity demand in India reached a record 270.8 GW due to increased reliance on air conditioning.
- Nighttime temperatures in Indian cities are rising significantly, preventing natural cooling and extending demand for air conditioning.
- Prime Minister Narendra Modi has called for a "whole-of-nation" approach to mitigate heatwave impacts.
India's cities are increasingly transforming into "heat traps" as rapid urbanization, the loss of green cover, and increased greenhouse gas emissions intensify heatwave conditions. This phenomenon is leading to a significant surge in compound hot-humid days, with an increase of over 20% in less than a decade. The "feels-like" temperatures are rising, driving a sharp increase in electricity demand for cooling and placing immense stress on the national power grid.
Peak power demand has reached record levels, touching 270.8 GW, as air-conditioner usage escalates. Projections indicate that air-conditioner penetration could reach nearly 40% of Indian households by 2030, further amplifying summer electricity consumption. The problem is compounded by rising humidity and hotter nights, which prevent buildings from cooling naturally after sunset, extending the demand for cooling appliances well into the night. Night-time indoor temperatures in low- and middle-income homes can remain uncomfortably high, often between 31.2°C and 32°C.
Urban Heat Island intensity in Indian cities now ranges between 2°C and 10°C, worsening urban heat stress. This unbalanced urban growth has also led to the devouring of water bodies and a considerable reduction in permeable spaces. In response to the escalating crisis, Prime Minister Narendra Modi has urged Union Cabinet Ministers to ensure their departments take necessary steps to mitigate the impact of the prevailing heatwaves, emphasizing a "whole-of-nation" approach.
The India Meteorological Department has forecast above-normal temperatures for June in several key regions, including Delhi, where temperatures have consistently stayed above 40 degrees Celsius. The situation highlights a critical urban design challenge, where neighborhood density, land-use choices, and building materials significantly determine the level of heat relief experienced by residents, particularly after sunset.