Transformer fire at Ayyanaroothu substation near Panneerkulam, Thoothukudi
EIR-0480Provisional entry. Confirmed: a transformer fire occurred at the Tangedco substation at Ayyanaroothu, Thoothukudi district, on a Saturday in June 2025, fed by a large volume of transformer oil and requiring a multi-agency response lasting about 12 hours. Not yet confirmed: the precise date and cause, as only one news report has been found and the article's own timestamp is inconsistent with its description of events. No further update is scheduled; the entry stays provisional until new information is published.
A fire broke out at an electricity board substation at Ayyanaroothu near Panneerkulam in Thoothukudi district, Tamil Nadu, in the early hours of a Saturday morning. The substation, operated by Tangedco and commissioned in 2014, steps down power generated by wind and solar farms in the region. According to sources cited in the report, a transformer caught fire following an electricity leak at around 4am. The transformer held approximately 80,000 litres of oil, which fuelled the fire and allowed it to spread rapidly. Foam tenders and fire vehicles from several stations, including Thoothukudi Thermal Nagar, NTPL and Tirunelveli, were called to the site. Officials built a sand barrier around the transformer to contain oil leakage. The fire was fully extinguished by around 4:30pm the same day, meaning the response and containment effort lasted roughly twelve hours.
An alleged electricity leak in a transformer is cited by sources as the initial cause; the large volume of transformer oil present (around 80,000 litres) contributed to the fire spreading and burning for an extended period.
- Large oil-filled transformers at substations handling renewable generation require robust leak detection and early fault alarms to prevent ignition events escalating.
- Bunding or sand barriers around transformers can help limit the spread of burning oil and should be part of standard emergency response procedures.
- Coordinated multi-agency fire response, including foam tenders from multiple stations, is important for substations with large oil inventories given the extended time needed for full extinguishment.
Published 2026-09-07. Written from public reporting. Descriptive, not investigative. See the data accuracy disclaimer.