India curtailed 378.52 MU of renewable energy in September 2026

India curtailed 378.52 million units of renewable energy in September 2026, according to a BusinessLine report published on October 22, 2026. The figure covers the month's total backed-up clean power that grid operators told generators not to produce or inject.

The report did not break the number down by state, by source, or by the reason for each curtailment. It also did not compare September 2026 with the same month a year earlier.

Curtailment happens when the grid can't absorb what solar and wind farms are ready to supply. The usual causes are transmission bottlenecks, local demand that doesn't match generation hours, and grid stability limits. Solar output peaks in the middle of the day, when many states have surplus power and few takers.

Why the number matters

Every curtailed unit is clean power that was built and paid for but never sold. Developers lose revenue on it. Discoms lose the chance to meet renewable purchase obligations with power that was already available. And the same electricity has to be generated later, often from coal.

378.52 MU is a monthly figure. Spread across September's 30 days, it works out to roughly 12.6 MU a day. That's a small share of India's total generation, but it's not trivial for the projects that took the hit.

The BusinessLine report gives the headline number and little else. No state-level data, no split between solar and wind, no word on whether the figure rose or fell from August.

What's missing from the picture

Without a state-wise breakup, it's hard to tell where the problem sits. Rajasthan, Gujarat, Tamil Nadu and Karnataka carry most of India's wind and solar capacity, and each has had curtailment trouble at different times. A single national number hides all of that.

The report also doesn't say whether the curtailment was technical or commercial. Grid operators sometimes cut renewable output for safety reasons. Sometimes they do it because thermal plants have to keep running under must-run obligations or long-term contracts.

That distinction matters for policy. Technical curtailment points to transmission and storage gaps. Commercial curtailment points to contract design and scheduling rules.

The bigger trend

India keeps adding renewable capacity faster than the grid and storage can keep up. Curtailment has become a regular feature of grid operations in high-renewable states, not an occasional event. The September figure fits that pattern, though the report doesn't say so directly.

Storage is the standard fix. Battery capacity is being tendered and built, but it's still small next to the installed base of solar and wind. Transmission upgrades take years. Until both catch up, some clean power will keep going to waste.

The BusinessLine report puts the September 2026 curtailment at 378.52 MU. That's the number on record. The details behind it are still to come.