The Sunshine Paradox: Plenty of Power, Nowhere to Go
On paper, India's solar journey is a resounding success, with installed capacity growing at an incredible pace. The nation is a world leader in adding clean energy. However, this rapid expansion has created a strange paradox: even as power demand soars
during heatwaves, solar power plants are sometimes ordered to stop generating electricity. This deliberate reduction is called 'curtailment'. In the first quarter of the 2026-27 financial year alone, India curtailed a massive 8,133 gigawatt-hours of solar power. This isn't wasted because of faulty panels or a lack of sunshine; it's wasted because our electrical system can't always absorb or transport the sheer volume of power being produced.
An Old Grid Meets a New Kind of Energy
A primary culprit is India's power grid, an engineering marvel that was designed for a different era. The grid was built around large, centralised thermal power plants that produce a steady, predictable amount of electricity. Solar power is the opposite: it's decentralised and variable, peaking at midday and disappearing at night. Trying to push massive, fluctuating amounts of solar energy through a system built for stability is like asking an elephant to dance. The transmission lines—the highways of our electricity grid—simply weren't built fast enough to keep up with the explosion of solar farms, many of which are in remote, sunny regions like Rajasthan and Gujarat. This creates traffic jams, or congestion, where the power has been generated but has no path to reach the cities and towns that need it.
The Financial Black Hole of Distribution
Another major hurdle lies with the state-run power distribution companies, or DISCOMs. For years, these companies have been saddled with enormous debt and operational inefficiencies. While their financial health has started to improve recently thanks to government reforms, deep-rooted issues remain. DISCOMs are often locked into long-term power purchase agreements (PPAs) with coal plants, which require them to pay fixed charges regardless of whether they use the power. When cheap solar power floods the grid during the day, inflexible coal plants cannot always ramp down their output quickly or economically. Faced with a choice, grid operators may curtail the 'must-run' but variable solar power to maintain grid stability and honour these older, rigid contracts.
The Challenge of Night and Cloud
The most fundamental challenge of solar power is its intermittency: the sun doesn't always shine. Peak solar generation happens in the afternoon, but peak electricity demand often occurs in the evening as people return home and switch on lights and appliances. Without a way to store the excess energy generated at noon for use at 7 p.m., its value is limited. India currently lacks sufficient utility-scale battery storage to bridge this gap. This means that even on a day with record solar generation, grid operators must keep coal plants running to meet the evening demand, further reducing the space available for renewables and leading to curtailment during daylight hours.
Untangling the Wires: The Path Forward
Solving this problem is the next great challenge in India's energy transition. The solutions are complex but clear. First is a massive overhaul and expansion of the transmission network to better connect solar-rich states with power-hungry regions. Second is the accelerated deployment of energy storage systems, especially large-scale batteries, which can absorb surplus daytime power and release it during evening peaks. Finally, making the entire grid 'smarter' and more flexible is crucial. This involves modernising coal plants to ramp up and down more quickly and implementing policies that help DISCOMs become financially robust enough to embrace, rather than fear, the renewable revolution.
