Power
Sri Lanka orders solar disconnection following nationwide blackout
Sri Lanka's grid operator instructed rooftop solar owners to disconnect following a nationwide blackout linked to transmission network instability.
Key points
- Sri Lanka experienced a nationwide blackout on October 17 due to unspecified transmission instability.
- The National System Operator ordered PV system owners to disconnect to support grid restoration.
- A prior blackout in February 2025 was attributed to high solar penetration reducing system inertia.
What happened
Sri Lanka's National System Operator (NSO) directed all photovoltaic system owners to disconnect their installations from the public electricity grid following a nationwide blackout. According to pv magazine reporting, the widespread power failure occurred on October 17 after the transmission network suffered unspecified instability. Electricity supplies were disrupted around mid-morning, prompting emergency recovery protocols.
The NSO confirmed that power supply returned to most regions later that evening. However, authorities maintained the directive for rooftop solar installations to stay offline indefinitely while grid stabilization efforts continued. Local reporting noted that previous grid disturbances in the country shared similar operational challenges related to high concentrations of distributed generation.
Historical context
Grid stability concerns are not entirely new to Sri Lanka's power sector. Investigations into a previous nationwide blackout on February 2025, conducted by the Ceylon Electricity Board (CEB), identified high solar photovoltaic penetration as a primary contributing factor. During that incident, solar generation met more than half of the total electricity demand at noon, leaving the transmission network with limited system inertia to absorb sudden faults.
Subsequent voltage drops triggered cascading disconnections across the island. By the end of 2025, Sri Lanka's cumulative rooftop photovoltaic capacity had expanded to reach 1.94 gigawatts. Meanwhile, daily electricity demand reached approximately 58 gigawatt-hours to 60 gigawatt-hours by March 2026, representing an average continuous power requirement between 2,400 megawatts and 2,500 megawatts.
Why it matters
As emerging economies rapidly scale up distributed renewable energy sources to meet climate and energy access targets, balancing grid stability becomes a critical engineering challenge. World Bank data indicates that Sri Lanka achieved full electricity access for its population by 2024, with renewable sources historically accounting for nearly half of its electricity output.
For power system operators, regulators, and energy investors across developing markets, the Sri Lankan experience highlights the vital importance of incorporating adequate system inertia, advanced inverter controls, and robust storage solutions alongside distributed solar expansion. Without these technical safeguards, high penetration levels risk triggering network vulnerabilities that can compromise grid reliability and disrupt commercial and domestic supply.
Original reporting
This article draws on the following reports. Read them in full on the publishers’ sites.
Context from CEII
Grids decide whether generation becomes power that homes and businesses can rely on. Generation mix, transmission and distribution losses, and tariffs together shape reliability and the case for investment.
100.0% of people in Sri Lanka had electricity in 2024Countries in this story
Written by the CEII Desk, the Centre’s automated newsroom, from the reporting credited above and CEII’s own data. Facts are attributed to their sources; the publishers have not reviewed this article. Spotted an error? Tell our editors.
