Tata Power shares fell sharply on August 27, 2026 after a Singapore court dismissed its challenge to a $490.32-million arbitration award won by Kleros Capital Partners, an investment firm, over a long-running Russian coal asset dispute.
Sharp intraday fall on Tata Power counter
Tata Power shares dropped as much as 4.5–4.7% in Thursday's trade, touching an intraday low of around ₹348, against a previous close of ₹364 on the BSE. The decline came a day after the company's exchange filing disclosed the outcome of its long-pending legal challenge, and it ranks among the stock's sharpest single-day falls in recent months.
Investors tracking the counter through an online trading platform would have seen the stock open weak and extend losses through the morning session, as the market absorbed the scale of the financial exposure now confirmed against the company.
What the Singapore court decided
The Singapore International Commercial Court (SICC) dismissed Tata Power's challenge to arbitral awards dated July 1, 2025 and August 27, 2025, both issued in favour of Kleros Capital Partners Limited. The court held that there was no breach of natural justice or the fair-hearing rule in how the majority of the arbitral tribunal arrived at its decision.
Tata Power disclosed the SICC's ruling to stock exchanges after market hours on August 26, 2026. The company said it has 28 days from that date to file an appeal before the Singapore Court of Appeal, and confirmed it intends to do so.
The size of the financial exposure
The underlying arbitral award grants Kleros damages of $490.32 million, carrying simple interest of 5.33% a year from November 30, 2020, along with a further $8.29 million in costs that carries similar interest from July 1, 2025. Kleros, in its own statement on the ruling, said the combined liability including accrued interest now exceeds $640 million a figure attributed to the claimant rather than confirmed independently by Tata Power.
| Component | Amount |
| Principal damages awarded to Kleros | $490.32 million |
| Interest on principal | 5.33% per annum from November 30, 2020 |
| Costs awarded to Kleros | $8.29 million |
| Interest on costs | 5.33% per annum from July 1, 2025 |
| Total liability claimed by Kleros (incl. interest) | Over $640 million |
How the dispute with Kleros began
The case traces back to 2013, when Kleros Capital Partners approached Tata Power with a proposal to jointly bid for a coal deposit in Russia. The two entered a non-disclosure agreement that September, intended to run for four years.
The partnership began to unravel around 2015–16 over disagreements on leadership of the bid and ownership structure. Tata Power went on to bid for the asset through a Russian subsidiary and secured the mining licence in 2017, after the non-disclosure agreement had lapsed.
Kleros alleged that Tata Power had misused confidential information and acted in bad faith to exclude it from the project, and initiated arbitration proceedings under Singapore International Arbitration Centre (SIAC) rules on November 30, 2020. Oral hearings in the case concluded in February 2024, well before the three-member tribunal delivered its verdict.
The tribunal, split 2:1, partially ruled in Kleros's favour with its July 2025 award, which Tata Power then challenged before the SICC, including a separate objection to how two of the arbitrators forming that majority had been appointed. Both challenges were unsuccessful.
What happens next for Tata Power
With the SICC challenge dismissed, Tata Power's next step is its planned appeal to the Singapore Court of Appeal, to be filed within the 28-day window from August 26, 2026. Until that appeal is heard and decided, the arbitral award and its associated interest remain a live contingent liability for the company.
For existing and prospective shareholders, this places Tata Power in the category of large-cap stocks carrying a material, quantified legal overhang. Anyone looking to participate in how the stock reacts through this process would need to open a demat account to hold and trade Tata Power shares listed on the NSE and BSE.
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Tata Power's stock trend so far in 2026
Even before Thursday's fall, Tata Power shares had been underperforming the broader market this year, down roughly 7–8.5% year-to-date and about 6–7% over the past month, compared with a milder year-to-date decline for the Nifty 50. The stock's market capitalisation was last placed at around ₹1.12 lakh crore.
Over a longer horizon, Tata Power shares had still delivered strong gains up roughly 43% over three years and around 177% over five years underscoring that Thursday's decline, while sharp, comes after a period of significant outperformance rather than a sustained downtrend. The company's quarterly disclosures and any Singapore Court of Appeal developments will be the key markers to watch on this case going forward.
