IndiGrid says Sohna operations will fully resume by May 2027

IndiGrid Infrastructure Trust says full operations at GPTL’s Sohna substation are expected by May 2027 after a fire on August 8, 2026 impaired its interconnecting transformers (ICTs) and reduced GPTL availability to 89.96% in the second quarter of financial year 2027 (Q2 FY27). IndiGrid says it is replacing the equipment, has reflected the impact in its latest valuation and has filed insurance claims.

What happened at IndiGrid’s Sohna substation?

A fire on August 8, 2026 impaired the ICTs at GPTL’s Sohna substation and affected the availability of the substation and associated lines. IndiGrid reported the incident in its Q2 FY27 operational update and identified it as the reason for GPTL’s lower availability during the quarter.

The presentation does not quantify the number of affected ICTs, the direct repair cost, lost revenue or the value of the insurance claim. It states that the GPTL ICT is being replaced and that full operations are expected by May 2027, extending the disclosed recovery period beyond Q2 FY27.

The issue was concentrated at GPTL rather than reported as a portfolio-wide safety event. IndiGrid recorded zero Medical Treatment Cases, zero First Aid Cases and zero Lost Time Incidents in Q2 FY27, while separately recording the Sohna equipment fire as an availability incident.

How much did the Sohna fire affect IndiGrid’s availability?

GPTL recorded availability of 89.96% in Q2 FY27, compared with IndiGrid’s transmission weighted-average availability of about 99.37% on a revenue basis. The 9.41-percentage-point gap shows the reported effect of the impaired equipment at GPTL relative to the wider transmission portfolio.

The asset-level list also shows the difference. KTHL reported 99.79%, JTC reported 99.80%, RTLC reported 99.86% and BDTC reported 99.96%, while KNTL, MTL, RSTPCL, GTL, NER-II and OGPTL each reported 100.00%. IndiGrid explicitly attributes GPTL’s lower availability to the ICT incident.

Portfolio reliability nevertheless improved from the prior-year quarter. Trips per transmission element declined to 0.18 in Q2 FY27 from 0.26 in Q2 FY26, and IndiGrid said most trips were caused by lightning and thunderstorms, insulator failure, relay maloperation, or damage to power and control cables rather than the Sohna fire.

What has IndiGrid said about valuation and insurance?

IndiGrid says the fire’s impact has been factored into its latest valuation and that insurance claims have been filed. The presentation does not disclose the valuation effect, insurance receivable, replacement cost or expected timing of claim settlement in rupees.

The May 2027 operational expectation does not establish when any insurance proceeds may be received. The source confirms only that claims have been filed, while the valuation statement indicates that IndiGrid has incorporated the incident’s impact in its latest valuation process.

The presentation also does not identify a revised revenue or distribution impact specifically attributable to GPTL. IndiGrid reported Q2 FY27 revenue of ₹1,315 crore, earnings before interest, taxes, depreciation and amortisation of ₹858 crore, and net distributable cash flow generated of ₹380 crore, but did not split those figures by GPTL.

IndiGrid announced a distribution per unit of ₹4.12 for Q2 FY27, up from ₹4.00 in Q2 FY26. Management said this was in line with annual FY27 distribution-per-unit guidance of ₹16.48, but the operational update provides no direct bridge between the GPTL incident and that guidance.

How did other IndiGrid operations perform in Q2 FY27?

Other reported operating measures were above GPTL’s affected availability level. IndiGrid’s solar portfolio generated 562.3 million units in Q2 FY27 at a 22% capacity utilisation factor, compared with 533.3 million units and 20.9% in Q2 FY26. Solar plant availability was about 96.7%, marginally below 96.9% a year earlier.

The battery energy storage systems at KBPL and GBPL reported weighted-average availability of 97.71% in Q2 FY27, above their 95% contractual availability requirement. Their weighted-average round-trip efficiency was 88.56%, above the stated contractual requirement of 85%, providing a separate operating benchmark from transmission availability.

IndiGrid’s safety and training indicators also changed year on year. Training man-hours rose to about 13,088 in Q2 FY27 from about 11,308 in Q2 FY26, while Lost Time Incidents fell to zero from one. Unsafe-condition reports increased to 3,453 from 3,241, whereas near-miss reports declined to six from 70.

When does IndiGrid expect the GPTL equipment to return?

IndiGrid expects full operations at GPTL’s Sohna substation by May 2027 as the impaired ICT is replaced. The presentation gives no interim commissioning date, phased restoration schedule, equipment supplier detail or confirmation that associated lines will recover availability before the full-operations target.

The May 2027 expectation should be assessed alongside GPTL’s 89.96% availability in Q2 FY27 and the stated valuation adjustment. Until replacement work is completed, the presentation leaves unresolved the pace of GPTL availability recovery, the final insurance outcome and whether the valuation impact changes.

IndiGrid’s wider market presentation identifies active transmission and battery energy storage bidding with a combined sector pipeline valued at about ₹1,24,644 crore. That figure is not a GPTL recovery forecast, but it provides context for the importance of operating transmission-asset availability while the Sohna replacement proceeds.

Conclusion

The August 8, 2026 fire created a disclosed operational disruption at GPTL, where Q2 FY27 availability of 89.96% was below IndiGrid’s approximately 99.37% revenue-weighted transmission availability. IndiGrid has set out a remedy through replacement of the impaired ICT, said its latest valuation reflects the impact, and confirmed that insurance claims have been filed.

The next disclosed milestone is IndiGrid’s expectation of full Sohna operations by May 2027. Subsequent updates may show replacement progress, GPTL availability in later quarters, the amount and settlement timing of insurance claims, and whether IndiGrid makes further valuation disclosures linked to the incident.