India's Solar Curtailment Crisis: Why 11 TWh of Clean Power Went to Waste

India is installing solar power faster than almost any country on earth right now — and simultaneously throwing a meaningful chunk of it away. In the last 15 months, the country curtailed nearly 11 terawatt-hours of solar generation, enough to power around 10 million homes for a year. Here's why a country racing to expand clean energy is also wasting so much of it, and what it means if you're relying on solar at home.

The Numbers — How Much Solar Is Being Curtailed?

Figures based on government data and Ember research as reported by industry publications, as of September 2026.

Why Gujarat and Rajasthan Are Ground Zero

Gujarat and Rajasthan together host close to half of India's total solar capacity, thanks to abundant land and sunlight in the west. But that concentration is also the problem: the transmission network in the region gets congested exactly when solar output peaks in the early afternoon, leaving grid operators with more power than the lines can carry — or than demand can absorb at that moment.

Three Root Causes

1. Grid Inflexibility

India's power system still leans heavily on coal, and coal plants cannot ramp their output up or down quickly. When solar floods the grid at midday, there's often nowhere for that thermal generation to go — plants can't throttle back fast enough to make room. One industry executive summed up the mismatch bluntly: trying to make thermal power plants flexible, they said, "is like asking an elephant to dance."

2. Transmission Constraints

Solar farms can be built in roughly two years. New transmission lines typically need a minimum of three. That mismatch compounds every year solar additions outpace grid buildout — and India has met only around 80% of its annual transmission construction targets over the past five years.

3. Storage Deficiency

Battery storage — the most direct fix for excess midday solar — remains tiny relative to what's needed. India's grid-scale battery capacity today is around 3 GW, against a projected requirement of roughly 74 GW by 2032 to support the country's renewable energy targets.

What India Is Doing About It

The government's stated targets remain ambitious: 500 GW of total clean electricity capacity by 2030, and close to 70% of installed power capacity from non-fossil sources by 2036. Meeting those goals while curbing curtailment will require faster transmission buildout, more grid-scale storage, and mechanisms to make thermal plants more flexible — all areas seeing renewed policy attention, though solving the mismatch will take years, not months.

What This Means for Homeowners with Rooftop Solar

Curtailment as reported here largely affects large, grid-connected solar farms feeding surplus power into an already-congested network — not individual rooftop systems, which primarily offset your own daytime electricity use before any surplus is exported. Still, the underlying pattern is relevant to anyone going solar in a high-solar-density state:

• If you're in a state with heavy grid-scale solar penetration, net-metering export approvals and settlement can face more friction as DISCOMs manage grid stability during peak solar hours.
• Self-consumption — sizing your system to match your own daytime load rather than maximizing export — is an increasingly sound strategy.
• Battery storage add-ons are becoming more attractive precisely because they let you store midday surplus for evening use instead of relying on the grid to absorb it.

Frequently Asked Questions