IndiGrid signs SPAs for Shongtong transmission asset at an enterprise value up to ₹5,315.8 Cr, payable only once the project earns revenue

IndiGrid Infrastructure Trust told the exchanges on Saturday, September 5, that it has executed Securities Purchase Agreements, dated September 4, 2026, to acquire the entire shareholding and management control of Shongtong Power Transmission Limited (SPTL) from Enerica ReGrid Infra Private Limited (EnerGrid) or a group entity of EnerGrid. The headline number is an enterprise value of up to ₹5,315.8 crore — stated in the filing as INR 53,158 million — roughly a third of IndiGrid's ≈ ₹15,687 crore market cap. The structure is the story: nothing falls due until the project is completed and revenue generating, and the deal needs unitholder approval first.

The filing states the acquisition happens in one or more tranches, only after SPTL becomes a completed and revenue-generating project. The ₹5,315.8 crore is therefore a cap on a future payment, not a cheque written today. The filing gives no tranche schedule, no per-tranche amounts, and no equity-versus-debt funding split — those follow later, subject to the Securities Purchase Agreements, the TSA, SEBI InvIT Regulations and the regulatory approvals the filing says may be required.

1. 1

   SPAs executed

   Sep 4, 2026

   Securities Purchase Agreement(s) dated September 4, 2026, signed with EnerGrid or its group entities for the entire shareholding and management control of SPTL.

2. 2

   Unitholder approval

   The filing states the proposed acquisition is subject to the approval of IndiGrid's unitholders. No meeting date is given in the disclosure.

3. 3

   Construction to COD

   SPTL's transmission system — evacuating the Shongtong Karcham (450 MW) and Tidong (150 MW) hydro projects in Himachal Pradesh — has an expected Commercial Operation Date of Q4 FY2029, with governmental and regulatory approvals to be obtained as required.

4. 4

   Tranche acquisitions post-COD

   IndiGrid acquires in one or more tranches once the project is completed and revenue generating, at enterprise value not exceeding ₹5,315.8 crore subject to closing adjustments, per the TSA and its lock-in restrictions.

This is a related-party purchase, and the filing says so plainly. The annexure identifies Terralight Solar Energy Tinwari Private Limited, a group entity of EnerGrid that has a common director with IndiGrid's Investment Manager, as a related party under Regulation 2(1)(zv) of the InvIT Regulations; the covering letter likewise describes EnerGrid as having a common director. The filing states the transaction will be completed at an arm's-length price and as per the valuation report taken under the InvIT Regulations — and the proposed acquisition is subject to the approval of IndiGrid's unitholders. That vote, and the valuation behind the price, are where the governance scrutiny will concentrate.

EnerGrid is a name IndiGrid's own disclosures have featured before. On July 24, IndiGrid 2 Private Limited — a wholly-owned subsidiary of the trust — transferred 74% of the paid-up share capital and 100% interest of Enerica Infra 4 Private Limited to EnerGrid, at a fair valuation conducted by an independent valuer. And IndiGrid's Q1 FY27 press release of August 12 carried, in its own headline, that EnerGrid won and received LOIs for two ISTS projects in Himachal Pradesh — cumulatively ~550 ckms and ~1,680 MVA, with capex of about ₹5,800 crore. Taken together, this suggests a working arrangement in which EnerGrid develops transmission projects and IndiGrid acquires them once they generate revenue — though the filings reviewed here stop short of describing any formal framework, and each acquisition stands on its own approvals.

None of this has traded yet. The disclosure hit the exchange at 15:39 IST on Saturday, September 5 — after the September 4 close of ₹175.25 — so the first session after the disclosure will deliver the market's verdict. Going in, the unit sits −2.7% below its highest close of the last 60 sessions (₹180.09 on July 22) and +2.1% above the lowest (₹171.60 on June 15): a band of roughly five percent across three months, the trading signature of a distribution vehicle rather than a growth stock. For reference, the unit moved −0.2% in the first session after the Q1 FY27 results and DPU declaration.

The funding backdrop, from filings within the last 60 days: the Investment Manager's board approved borrowings of up to ₹6,400 crore at its February 12, 2026 meeting, and on August 20 the Allotment Committee allotted Series AI non-convertible debentures aggregating up to ₹350 crore — 35,000 partly-paid NCDs of ₹1,00,000 face value each. The Q1 FY27 distribution of ₹4.12 per unit (interest ₹2.6909, taxable dividend ₹0.0224, capital repayment ₹1.4067) was declared in line with full-year guidance of ₹16.48 per unit. Because the Shongtong payment falls due only after the project earns revenue — expected Q4 FY2029 — there is no immediate cash outflow; how the eventual tranches are funded, and what that means for distributions in FY2029 and beyond, is a question the filing leaves open.