India’s power sector is confronting a paradox that has become increasingly visible in recent months. Coal-fired generation has risen sharply, yet several states are scrambling for extra electricity allocations from the Centre, especially after sunset. The night-time squeeze has exposed structural limits in the grid: weak hydropower, plant outages, critically low coal stocks at many stations, and the absence of sufficient storage to carry daytime solar surplus into the evening hours.
The situation has grown acute enough that Rajasthan and Gujarat—two of the country’s leading renewable-energy states—have joined Maharashtra, Tamil Nadu, Andhra Pradesh, West Bengal, Uttar Pradesh, Chhattisgarh and Delhi in seeking additional supplies. Officials familiar with the matter note that the federal government normally holds 14–15 gigawatts of unallocated power from coal and hydro plants that can be redistributed during shortages. That cushion has thinned because hydropower itself is under pressure.
Surge in Shortages Despite Stronger Coal Output
Power shortages across India climbed to 560 million kilowatt-hours in September, the highest monthly figure since August 2023. This occurred even as coal-fired generation increased 13.3 percent year-on-year. The rise in coal output was a direct response to robust electricity demand driven by industrial activity and residual heat. Yet the additional thermal generation could not fully compensate for losses elsewhere in the system.
Nearly 41 GW of generating capacity was offline, according to Grid India data. At the same time, roughly 47 percent of coal-fired plants were operating with critical fuel stocks—less than a quarter of their mandated inventory. These dual constraints—forced and planned outages combined with thin coal piles—left little spare capacity to meet the evening ramp-up in demand.
Hydropower Weakness and the El Niño Effect
Hydropower, long a flexible resource that can be dispatched quickly after dark, has underperformed significantly. Output fell about 20 percent from a year earlier in September following an El Niño-related decline in rainfall. Reservoir levels in key regions remain low, limiting the ability of hydro stations to respond to night-time peaks. Wind generation has also been weaker than usual, further reducing non-solar, non-coal options during the critical hours after sunset.
The Centre has already diverted extra power to Punjab, where some areas experienced outages lasting up to 14 hours a day in September. With the available unallocated pool already stretched, meeting additional requests from other states would require withdrawing supplies from elsewhere—an option that is politically and operationally difficult.
The Solar-Storage Gap After Sunset
India’s rapid expansion of solar capacity has transformed daytime supply. Solar now meets a substantial share of midday demand, and in many hours the grid actually experiences surplus renewable generation. The problem begins when the sun sets. Without adequate battery storage or pumped hydro capacity, the surplus cannot be shifted into the evening and night. Conventional plants—primarily coal—must then ramp up steeply to cover the gap.
This pattern has become more pronounced as air-conditioning and other cooling loads persist later into the night because of elevated temperatures. Peak night-time demand has risen markedly in recent years, placing greater stress on the remaining dispatchable resources precisely when solar disappears. Analysts describe the resulting load shape as a steeper “duck curve,” in which conventional generation must first back down during solar-rich midday hours and then surge upward after sunset.
Maintenance, Stocks and Planning Shortfalls
Several coal plants are undergoing scheduled or forced maintenance, removing capacity at a time when it is most needed. The combination of outages and low coal inventories has left the thermal fleet with limited headroom. Plant load factors at many stations are already high, leaving little room for further increases. Gas-based plants have been called upon to provide some evening flexibility, but their higher operating costs and fuel constraints limit their contribution.
States themselves bear part of the responsibility. Many did not anticipate that high temperatures and strong demand would extend so far into the post-monsoon period. As a result, long-term power purchase arrangements proved insufficient, forcing greater reliance on the short-term market where prices have risen. The mismatch between contracted supply and actual night-time requirements has amplified the pressure on the central allocation mechanism.
Broader Implications for Grid Reliability
The current crunch is not merely a seasonal inconvenience. It highlights a structural challenge in India’s energy transition. Solar capacity has grown rapidly and continues to expand, delivering low-cost daytime power. Yet the complementary resources required for after-sunset reliability—storage, flexible hydro, and well-maintained thermal capacity with adequate fuel—have lagged. Hydropower growth has been slow, nuclear additions take years, and battery storage remains far below the scale needed to shift meaningful volumes of daytime solar into the evening.
Night-time shortfalls have at times exceeded those recorded during the peak summer heatwaves earlier in the year. In September, deficits reached several gigawatts during non-solar hours even as overall coal generation climbed. This underscores that aggregate generation numbers mask critical timing mismatches. What matters is not only how much power is produced over a month, but whether it is available when demand peaks after dark.
The Path Forward
Addressing the night-time squeeze will require coordinated action on multiple fronts. Accelerating the deployment of battery energy storage systems and pumped hydro can help capture excess daytime solar. Ensuring that coal plants maintain adequate fuel stocks and minimise avoidable outages will preserve the flexibility of the thermal fleet in the near term. Improving demand forecasting and encouraging states to secure more robust long-term contracts can reduce last-minute scrambling for central allocations.
Greater operational flexibility from the existing coal fleet—running at lower minimum loads during the day and ramping more aggressively in the evening—is already being practised, yet physical and technical limits remain. Over the longer horizon, a balanced portfolio that includes more storage, flexible hydro and carefully timed thermal capacity will be essential if India is to meet rising electricity demand without recurring night-time shortages.
The present episode serves as a clear reminder. Rising coal generation alone cannot guarantee reliable power after sunset when hydropower is weak, plants are offline, coal stocks are critical, and storage is scarce. Bridging that gap is now one of the central challenges facing India’s power system.
Read more – wardrobeoops.com
