Key Details
Rapid solar expansion is transforming India’s electricity system, but the working paper argues that storage, flexible markets and demand-side reforms must now grow just as quickly to keep the grid reliable.
Key Area | Key Finding | Why It Matters |
|---|---|---|
Core finding | India’s electricity challenge is shifting from generation adequacy to grid flexibility as solar capacity expands. | Signals a structural change in power system planning. |
Net load | Solar generation is flattening daytime net load while creating much steeper evening demand ramps. | Conventional generation and storage must respond much more rapidly. |
Market signals | Afternoon electricity prices are falling while evening prices are rising sharply. | Indicates increasing economic value of flexibility and storage. |
Renewable curtailment | Large volumes of solar power are being curtailed despite electricity shortages after sunset. | Highlights the mismatch between renewable generation and demand timing. |
Storage gap | Around 130 GWh of storage would be needed to halve a typical summer evening ramp, well above current capability. | Battery storage is emerging as a critical infrastructure priority. |
Policy direction | Draft electricity reforms recognise storage, demand response and Time-of-Day tariffs as core elements of future electricity markets. | Reflects a shift towards a more flexible and consumer-responsive power system. |
Summary
India’s Electricity Challenge Is Becoming One of Timing Rather Than Capacity
The EAC-PM working paper, The Duck and the Camel: Tracing the Net Load on the Indian Power Grid, argues that India’s electricity transition has entered a fundamentally different phase. For decades, the principal policy objective was expanding generation capacity to meet rising demand. Today, rapid growth in solar power means the larger challenge is ensuring electricity is available when it is needed rather than simply generating more of it.
The paper illustrates this transition through net load—the electricity that must still be supplied after solar generation is deducted from total demand. As solar capacity has expanded from 2% of installed capacity in 2015–16 to about 29% in 2026, daytime demand is increasingly met by renewable energy. At the same time, conventional generators must respond to much steeper changes in demand as solar output rises and falls during the day.
This structural shift was evident on 21 May 2026, when India met a record 270.8 GW of electricity demand while managing a 46.7 GW increase within less than eight hours, highlighting the growing operational challenge of balancing the grid.
Solar Has Changed the Shape of India’s Power System
Rather than creating a shortage of electricity, solar generation is changing when electricity is available.
The report describes this through the “Duck Curve” during summer and the “Bactrian Camel Curve” during winter. Solar generation creates a pronounced decline in daytime net load before conventional generation must rapidly increase output after sunset as demand remains high.
Between 2023 and 2026, the summer evening net-load ramp almost doubled from 35.7 GW to 73.7 GW, while winter now exhibits two distinct demand peaks separated by a solar-driven midday trough. Even during the monsoon, when solar output declines because of cloud cover, evening ramps continue to become steeper.
The paper argues that these changing demand profiles represent one of the most important operational consequences of India’s clean energy transition.
Market Signals Show That Flexibility Has Become Increasingly Valuable
Electricity markets are already reflecting the changing economics of the grid.
Wholesale electricity prices now fall sharply during periods of abundant solar generation before rising rapidly after sunset. On 21 May 2026, electricity traded at around ₹1.56 per kWh during the afternoon before reaching the market ceiling of ₹10 per kWh in the evening.
At the same time, India is increasingly curtailing renewable energy while facing shortages only a few hours later. The paper estimates that approximately 747 million units of solar electricity were curtailed during May 2026, even though electricity shortages occurred primarily after sunset rather than during solar hours.
According to the authors, these simultaneous price swings, renewable curtailment and evening shortages indicate that grid flexibility - not generation capacity - is emerging as the primary constraint.
Storage Becomes the Missing Link in the Energy Transition
The report identifies energy storage as the most direct solution to India’s evolving grid challenge.
It estimates that around 130 GWh of storage would be required to halve a typical summer evening demand ramp, compared with current daily storage discharge of only about 23.8 GWh. While pumped hydro deployment is approaching planned targets, battery storage remains well behind projections despite recent progress.
The working paper therefore argues that renewable expansion must now be accompanied by rapid growth in battery storage, pumped hydro, demand response programmes, Time-of-Day tariffs and more flexible electricity markets. It points to recent draft electricity reforms—including legal recognition of energy storage and stronger market mechanisms—as important steps towards building a grid capable of supporting much higher renewable penetration.
What is Net Load?
Net load is the amount of electricity that must be supplied by conventional or dispatchable sources after variable renewable generation—primarily solar—is deducted from total electricity demand. As solar capacity expands, net load falls during daylight hours but rises sharply after sunset, making storage, flexible generation and demand management increasingly important for maintaining grid stability.
Policy Relevance
India’s power transition is entering a flexibility-driven phase, where grid flexibility may become as important as generation capacity for ensuring energy security.
Battery storage, pumped hydro and flexible transmission infrastructure will determine the pace of renewable energy integration, enabling the grid to accommodate rising shares of variable renewable power.
Growing differences between daytime and evening electricity prices strengthen the case for flexibility-oriented market reforms, including Time-of-Day tariffs, demand response and incentives that reward flexibility rather than generation alone.
Energy storage is emerging as core power infrastructure, with important implications for long-term planning, regulation and investment.
Recent legislative and regulatory proposals point towards a more flexible and consumer-centric electricity market, centred on storage, market-based flexibility and greater consumer participation.
The success of renewable energy policy will increasingly depend on system flexibility as well as installed capacity, measuring not only how much clean power is generated but also how effectively it can be stored, shifted and delivered when demand is highest.
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