Electricity in India behaves like a living market, where daytime power sometimes sells at zero or negative rates. During daylight, solar panels produce massive electricity, flooding the grid, causing prices on exchanges to crash. At night, as solar generation drops, demand peaks because homes, offices, and industries simultaneously draw power.
Thermal plants then operate at full capacity, raising generation costs 3-5 times above daytime solar, pushing prices to ₹12–14 per unit.
How the Duck Curve Shapes Markets
This daily fluctuation, called the “duck curve,” shows morning and evening peaks with a deep midday trough. The curve resembles a duck silhouette, reflecting low midday prices when solar power surges and high evening costs.
Experts note that increasing solar capacity deepens this duck curve, further stressing grid stability and pricing predictability.
Solar Power Surpluses and Negative Pricing
Around 6–7 AM, solar panels across rooftops, fields, and deserts start generating power. By midday, many plants operate at peak, creating an electricity surplus, sometimes pushing exchange prices to zero or negative.
In some states, utilities pay buyers to absorb extra electricity, avoiding grid instability.
Evening Challenges and Thermal Dependence
As sun sets around 5–6 PM, solar generation declines sharply. Meanwhile, households activate lights, ACs, and other appliances, sharply increasing demand. Distribution companies must switch on coal and gas plants immediately, causing night electricity prices to surge dramatically.
Storage Deficiency and Solutions
The inability to store excess daytime solar causes extreme evening price spikes. India’s battery storage capacity remains insufficient, with grid-scale deployment still in early stages. Hydro storage and pumped storage projects exist, but construction delays prevent immediate relief.
Emerging Measures and AI Innovations
The government considers time-of-day tariffs and storage subsidies to manage pricing volatility.
Startups are developing AI-powered plants that adjust output dynamically, producing less during day and more at night. Experts warn that without large-scale storage, the wild swings in electricity pricing will continue for several years.
India’s electricity markets now reflect the tension between abundant solar power and evening peak demand. Until storage catches up, consumers will see low daytime rates and high nighttime bills, emphasizing the critical role of energy management.
