El Nino's heat test: India may face world's biggest energy system impact
An analysis by the Centre for Research on Energy and Clean Air (CREA) projects that India is likely to face the most severe stress on its power system of any country during the anticipated El Niño period from July 2026 to June 2027.
Weaker monsoon conditions associated with El Niño are projected to reduce hydropower generation by approximately 2.9 TWh and wind generation by approximately 4.9 TWh over the year.
Simultaneously, hotter temperatures are expected to drive additional cooling demand of around 10 TWh — equivalent to roughly a quarter of Delhi's annual electricity consumption.
The combined supply-demand mismatch adds up to a generation gap of nearly 18 TWh, which the grid is most likely to bridge through increased coal-fired generation.
Solar generation is expected to remain broadly stable under El Niño conditions, reinforcing its growing importance as a weather-resilient source in India's energy transition.
El Niño–Southern Oscillation (ENSO)
ENSO is a recurring coupled ocean-atmosphere climate phenomenon in the tropical Pacific. Under neutral conditions, easterly trade winds drive warm surface water westward across the Pacific, sustaining the Walker Circulation — a large atmospheric convective loop. During El Niño, these trade winds weaken, allowing warm water to spread eastward; this flattens the Walker Circulation, disrupts moisture transport, and typically reduces the intensity of the Indian Summer Monsoon. The inverse phase, La Niña, strengthens trade winds and is associated with above-normal monsoon rainfall over the Indian subcontinent.
Key Details
- The ENSO cycle oscillates with a periodicity of roughly 2–7 years.
- El Niño years are statistically correlated with below-normal Indian Summer Monsoon Rainfall (ISMR), though the relationship has weakened somewhat in recent decades.
- The Southern Oscillation Index (SOI) measures the atmospheric component; negative SOI values signal El Niño conditions.
- La Niña is the opposing cold phase; together they constitute the full ENSO cycle.
A transitioning El Niño period from July 2026 reduces cloud cover and monsoon intensity, directly denting wind speed and river flows that feed hydropower stations, creating the projected 18 TWh generation gap.
India's Electricity Generation Mix and Coal Dependency
India's installed generation capacity stood at approximately 532.7 GW as of early 2026, of which coal-based thermal power accounts for around 219 GW. Coal still contributes roughly 60% of actual electricity generation by volume, owing to its dispatchability and base-load role. Renewable energy (solar, wind, hydro, small hydro, biomass) collectively accounts for approximately 40% of installed capacity, but variable renewable output fluctuates with weather. The government has a target of 500 GW of non-fossil installed capacity by 2030, including around 300 GW of solar — a commitment made under India's updated Nationally Determined Contribution (NDC) at COP26.
Key Details
- India's 500 GW non-fossil fuel target by 2030 forms part of its NDC pledge under the Paris Agreement.
- The National Solar Mission (Jawaharlal Nehru National Solar Mission) was launched on January 11, 2010 under the National Action Plan on Climate Change (NAPCC).
- The Central Electricity Authority (CEA) projects coal-based thermal capacity share will decline to around 32% of installed capacity by 2030, from a present share near 52%.
- In FY 2025–26, renewables accounted for 95% of new capacity additions, while coal power generation fell 3% in 2025.
When El Niño dents wind and hydro output simultaneously, coal remains the only dispatchable backstop at scale. The projected additional 17.7 TWh of coal generation translates into an estimated 17 million tonnes of additional CO₂ emissions, directly testing India's energy security and climate commitments.
Energy Security: Trilemma of Sustainability, Reliability, and Affordability
Energy security refers to the uninterrupted availability of energy sources at an affordable price. The World Energy Council frames it as an "energy trilemma" across three dimensions: energy equity (access and affordability), energy security (reliability and resilience), and environmental sustainability. India faces a structural vulnerability: its rapid build-out of variable renewable energy — while essential for decarbonisation — creates grid-reliability challenges during weather anomalies such as El Niño, because solar and wind cannot be stored or dispatched on demand without adequate battery storage or pumped hydro.
Key Details
- Grid-scale Battery Energy Storage Systems (BESS) are increasingly cited as critical for firming variable renewable generation; India's MNRE has announced viability gap funding (VGF) for battery storage projects.
- Pumped storage hydro is the largest form of utility-scale energy storage globally and can complement both solar and wind in managing intra-day fluctuations.
- India's per-capita electricity consumption remains well below the global average, meaning cooling-demand growth from heat waves and El Niño events is a long-run structural driver of electricity demand.
The finding that solar remains stable under El Niño while wind and hydro contract underscores the importance of diversifying renewables and accelerating battery storage deployment to reduce coal-fallback dependence during weather-driven generation shortfalls.
- Projected generation gap due to El Niño (July 2026–June 2027): ~18 TWh
- Additional cooling demand from El Niño heat: ~10 TWh
- Projected reduction in hydropower output: ~2.9 TWh
- Projected reduction in wind power output: ~4.9 TWh
- Estimated additional coal generation to bridge gap: ~17.7 TWh (worst case: ~24 TWh)
- Estimated additional CO₂ emissions from extra coal burn: ~17 million tonnes
- India's installed coal-based capacity (December 2025): ~219.61 GW
- India's total installed generation capacity (March 2026): ~532.7 GW
- India's 2030 non-fossil installed capacity target: 500 GW (NDC pledge, COP26)
- National Solar Mission launched: January 11, 2010
- Renewable share of total installed capacity (October 2024): ~46.3% (crossed 200 GW milestone)