India curtailed 8,133 GWh solar power in Q1 to ‘maintain grid security’: Centre informs Parliament
The government informed Parliament that 8,133 GWh of solar power generation was curtailed (held back from the grid) during the April-June quarter
Monthly curtailment was 2,417 GWh in April, 3,235 GWh in May, and 2,481 GWh in June
The curtailment was attributed to the need to maintain grid security amid transmission constraints and a mismatch between the pace of renewable capacity addition and transmission infrastructure buildout
India's installed solar power capacity stood at 162.15 GW as of 30 June 2026
The information was presented in response to parliamentary questions on renewable energy integration challenges
"Must-Run" Status of Renewable Energy and Its Limits
Solar and wind power in India carry "must-run" status under Clause 5.2(u) of the Indian Electricity Grid Code (IEGC), meaning their output cannot ordinarily be curtailed ahead of conventional generation because they have near-zero variable cost and support India's clean energy commitments. However, the IEGC and CERC regulations permit curtailment as an exception when it is necessary for grid security — a term not precisely defined in regulation, which has led to disputes over compensation and the scope of the exception.
Key Details
- Must-run status established under IEGC Clause 5.2(u); IEGC framed under Section 178 of the Electricity Act, 2003
- CERC (Central Electricity Regulatory Commission) adjudicates disputes over curtailment and compensation under Section 79 of the Electricity Act, 2003
- Grid security exception allows curtailment when frequency, voltage or transmission-line loading thresholds are threatened
- Renewable generators are often entitled to compensation for "deemed generation" when curtailed for non-technical (commercial) reasons, but not for genuine grid-security curtailment
The government's justification — grid security — invokes the specific regulatory exception to must-run status, distinguishing this curtailment from commercial curtailment by distribution companies, which would ordinarily attract compensation claims.
Transmission Bottlenecks and the Renewable Energy Evacuation Challenge
A recurring challenge in India's energy transition is that renewable generation capacity, especially solar and wind in resource-rich states, is being commissioned faster than the transmission lines needed to evacuate that power to demand centres. This creates "evacuation infrastructure lag," forcing grid operators to curtail generation rather than risk instability from over-injection into congested transmission corridors.
Key Details
- Renewable-rich states (Rajasthan, Gujarat, Karnataka, Tamil Nadu, Andhra Pradesh) frequently report the highest curtailment volumes
- The Green Energy Corridor scheme (launched 2015-16, expanded in later phases) is the dedicated transmission infrastructure programme meant to address this lag
- State Load Despatch Centres (SLDCs) and the National Load Despatch Centre coordinate real-time curtailment decisions
The government's cited reason — a mismatch between transmission line commissioning and renewable project commissioning — is precisely the evacuation-lag problem the Green Energy Corridor programme was designed to solve.
India's 500 GW Non-Fossil Fuel Capacity Target (2030)
At COP26 (Glasgow, 2021), India announced its "Panchamrit" climate pledges, including a target of 500 GW of non-fossil fuel-based electricity generation capacity by 2030. This is distinct from India's Nationally Determined Contribution (NDC) commitment of about 50% cumulative installed electric power capacity from non-fossil sources by 2030. The National Solar Mission, launched in 2010 under the National Action Plan on Climate Change, was the original vehicle driving India's solar capacity buildout, with successive upward revisions to its target.
Key Details
- National Solar Mission launched 2010 under the National Action Plan on Climate Change (NAPCC)
- COP26 (2021) Panchamrit pledge: 500 GW non-fossil capacity by 2030
- Updated NDC (2022): about 50% cumulative installed capacity from non-fossil sources by 2030
- India's non-fossil capacity share crossed 50% of total installed capacity in 2026, well ahead of the original 2030 timeline
Curtailment episodes illustrate a paradox of rapid renewable scale-up: capacity additions are outpacing the grid infrastructure needed to fully utilise that capacity, even as India's aggregate non-fossil targets are being met or exceeded on paper.
- Total solar curtailment, Q1 (April-June): 8,133 GWh
- Monthly breakdown: April 2,417 GWh, May 3,235 GWh, June 2,481 GWh
- Installed solar capacity as of 30 June 2026: 162.15 GW
- National Solar Mission launched: 2010
- India's non-fossil capacity target: 500 GW by 2030 (COP26 Panchamrit pledge, 2021)
- India's NDC non-fossil capacity commitment: ~50% of cumulative installed capacity by 2030
- Regulatory basis for must-run status: IEGC Clause 5.2(u), under Electricity Act, 2003