CREA: India Curtailed Over 4% of Its Solar Output in July and August

Curtailing solar electricity means deliberately preventing some generated solar power from reaching electricity users. The energy is available, but grid or operating limits require it to be reduced or switched off. This matters because investment and generation capacity do not automatically translate into delivered electricity.

India curtailed about 1.835 billion units of renewable electricity in July and August, mostly solar. More than 4% of the solar power generated during those two months was curtailed. CREA linked the reductions to grid and operational constraints, even as solar output reached new records.

Curtailment reduces the renewable electricity that consumers can receive. It can also show that the system lacks enough flexibility, storage, or suitable grid capacity to use variable generation. India plans to require solar and wind projects to install batteries at their sites from July 2027, aiming to reduce these losses.

India curtailed about 1.835 billion units, or MU, of renewable electricity during July and August. CREA said most of that curtailed energy was solar. The volume shows that curtailment was not a minor event, even though India also recorded renewable-generation and solar-output records.

The article gives a separate comparison for solar: more than 4% of the solar power generated in July and August had to be curtailed. This means at least one part in 25 of solar generation was not delivered because of grid and operational constraints. The article does not provide the total amount of solar electricity generated across both months.

Therefore, the 1.835 billion MU figure covers curtailed renewable energy, while the 4% figure describes curtailed solar as a share of solar generation. Together, they show significant renewable energy was unavailable to users. The report identifies the problem as system constraints rather than weak solar production.

High electricity demand does not guarantee that every power source can operate whenever needed. Electricity must move through available grid infrastructure and be managed across power plants, demand, and operating limits. CREA attributed India’s solar curtailment to grid and operational constraints, alongside a need for more flexibility in renewable power systems.

The timing was unusual. India’s demand surged between July and September, yet about 1.835 billion MU of renewable energy, mostly solar, was curtailed in July and August. At the same time, coal plants increasingly had critically low inventories. Plants with coal stocks below 25% of normative requirements rose from 32 on August 22 to as many as 85 on October 1.

These facts point to a system under pressure from different directions. Coal availability was weakening, but the grid still could not fully use all renewable output. The article does not identify one single bottleneck. It says grid and operational constraints, plus limited renewable flexibility, caused the curtailment. Batteries are planned as one response.

Solar was the main engine of India’s recent renewable-generation growth. CREA found that solar power accounted for 58% of the increase in renewable electricity generation during the second quarter of India’s 2026/2027 fiscal year. That made solar the primary contributor to the expansion.

Solar generation increased 39% year-on-year in the quarter. Wind generation grew 29%, and nuclear generation grew 26%. Hydropower moved in the opposite direction, declining by 20%. Solar also reached a new daily output record of 705 million units on September 30, exceeding the previous record from the first quarter.

The figures show strong solar momentum, but they also expose a system challenge. Generation growth is useful only when the grid can absorb and deliver the electricity. India curtailed more than 4% of solar generation in July and August despite this rapid growth. Planned battery storage at solar and wind sites is intended to make more of that output usable.

When renewable electricity is curtailed, that available generation is not delivered to consumers. The immediate consequence is lost use of clean power. This matters because India is expanding renewable capacity quickly, yet capacity and record production do not guarantee that electricity can flow through the system.

In July and August, about 1.835 billion MU of renewable generation, mostly solar, was curtailed. More than 4% of solar generation during those months was affected. Solar output still reached 705 MU on September 30, a new daily record. These figures show that curtailment can occur alongside strong production, not only during periods of weak demand.

The article links the problem to grid and operational constraints and limited flexibility. It does not quantify outages or consumer price effects. However, curtailment leaves the system with less renewable electricity than it could have used. India’s planned battery requirement for solar and wind projects, beginning in July 2027, is intended to reduce that gap.

Batteries can help when renewable projects produce more electricity than the grid can immediately accept. Instead of curtailing the excess, a project can store it temporarily. The stored electricity can later be sent to the grid when renewable output falls or operating conditions improve. This makes supply more flexible.

India plans to introduce a regulation from July 2027 requiring developers of solar and wind projects to install battery storage at project sites. The measure responds directly to curtailment and to the limited flexibility of renewable energy sources. In July and August, about 1.835 billion MU of renewable electricity, mostly solar, was curtailed.

Site batteries would not automatically solve every grid constraint, but they could reduce the amount of power rejected during high-output periods. They could also shift delivery away from moments when the network is constrained. The article presents storage as a planned response, not as a result already achieved. Its effectiveness will depend on how the regulation is implemented and operated.

An electric grid is the connected network that links power generators, transmission lines, distribution systems, and electricity users. It coordinates electricity flows across this network. The source article discusses grid constraints, but it does not define the grid or explain instant balancing, so this explanation uses established electricity-system knowledge.

Electricity is consumed as it is produced. If users suddenly need more power, generators must increase output or stored electricity must respond. If generation rises above what users and the network can accept, operators may reduce output from some plants. Solar curtailment is one example of that adjustment when grid or operating limits prevent delivery.

Balance is essential for stable grid operation. India’s record renewable generation shows that producing more electricity is not enough if the system cannot move or manage it. The article reports curtailment despite surging demand and low coal inventories. Planned batteries could help by storing excess renewable power and releasing it when the grid can use it.