Diamond Power shares rise 4.5% on ₹76 crore high-voltage cable order

In a filing dated 3 September 2026, Diamond Power Infrastructure Ltd informed exchanges that it has received a Letter of Acceptance dated 3rd September, 2026 from a domestic EPC contractor for the supply of 66 kV EHV underground power cables for a 66 kV transmission project in Gujarat (page 1 of the filing).

Key commercial details are set out in Annexure A (page 2):

• The order value is "₹76,05,89,060/- (Rupees Seventy-Six Crore Five Lakh Eighty-Nine Thousand and Sixty Only), including GST."
• The order is on a "variable-price basis; final realisation will be as per the price variation formula applicable to the order."
• The scope covers supply of "38/66 kV (E), 1 core, 630 sq. mm. aluminium conductor, XLPE insulated, copper wire screened, aluminium corrugated sheathed, HDPE outer sheathed underground power cables, on FOR site basis, for a 66 kV transmission project in Gujarat."
• Deliveries are to "commence upon manufacturing clearance, at a scheduled rate of approximately 50 km per month, to be advanced in line with project requirements."

The filing clarifies that the order has been awarded by "a domestic private-sector EPC contractor engaged in power transmission projects" and that the counterparty’s name is not disclosed due to confidentiality obligations. It also states that promoters and group companies have no interest in the awarding entity and that the transaction "does not fall within related party transactions" (page 2).

The attached press release in Annexure B (page 3) provides more colour on the scale and positioning of the order:

• Diamond Power says it "has received a Letter of Acceptance for the supply of 66 kV Extra High Voltage (EHV) underground power cables valued at approximately Rs. 64.46 crore, excluding GST."
• The order covers the supply of "2,92,985 metres – approximately 293 kilometres" of the 38/66 kV, 1 core, 630 sq. mm cable, delivered on an FOR site basis.
• Deliveries are "scheduled at approximately 50 km per month from manufacturing clearance, and the Company will look to advance this schedule in line with project requirements."

The company positions this as a strategically important win in a technically demanding niche. The release notes that cables at 66 kV and above "are among the most technically demanding products in the sector, requiring triple-extrusion CCV lines, corrugated metallic sheathing and an approved type-test pedigree – capabilities that only a small number of Indian manufacturers possess." It further states that this segment "also carries among the highest realisations and margins in the Company’s cables portfolio."

Management commentary from Whole-time Director Umesh Chhayya underscores that Extra High Voltage is "central to how we intend to grow" and that the company’s order book "continues to build across utilities, renewables, data centres and industrial customers" (page 3).

With no other major market commentary flagged around the time of the move, the 4.5% rise in Diamond Power Infrastructure’s share price appears primarily linked to this order announcement.

Several aspects of the filing help explain why the market reacted positively:

1. Order size and visibility: At ₹76,05,89,060 including GST, this is a meaningful single order for a specialised product line. The disclosed schedule of approximately 50 km per month of deliveries, with scope to advance in line with project needs, gives investors clearer visibility on near- to medium-term execution volumes.

2. High-value EHV mix: The company explicitly highlights that EHV cables carry "among the highest realisations and margins" in its portfolio. While the filing does not disclose any margin percentages or profitability metrics for this order, the emphasis on higher realisations and the technically intensive nature of 66 kV products suggests a favourable mix shift towards premium offerings.

3. Reinforcement of technical positioning: The press release stresses that only a "small number of Indian manufacturers" possess the combination of triple-extrusion CCV lines, corrugated metallic sheathing and type-test pedigree required for such cables. For equity investors, repeated wins in such a niche can be read as validation of the company’s technology investments and a potential barrier to entry for competitors.

4. Alignment with sector tailwinds: The company links the order to broader industry trends, stating that India’s transmission build-out is driving "sustained demand for EHV underground cabling" as utilities and developers move to underground corridors in urban and industrial centres and connect renewable clusters to the grid. It also notes that it has been scaling its MV and EHV capacity, "including additional CCV and corrugation lines being commissioned as part of its ongoing capital expenditure programme." This positions the order as part of a larger growth runway rather than a one-off.

5. Non-related party, arm’s-length transaction: The explicit clarification that the order is in the ordinary course of business, at arm’s length, and not a related-party transaction may also reassure investors focused on governance and quality of revenue.

The disclosure is focused on the order win and does not provide:

• Any revenue or profit guidance linked to this order.
• Margin percentages, order-level profitability, or expected contribution to overall earnings.
• The exact execution timeline in months or quarters beyond the indicative 50 km per month schedule.
• Details of the broader order book size or backlog.

As a result, while the market appears to be treating the announcement as a positive signal for growth and mix, the precise earnings impact remains unspecified in the filing.

Diamond Power Infrastructure’s latest 66 kV EHV cable order adds roughly 293 kilometres of high-specification product to its pipeline and underscores its positioning in a premium, capability-intensive segment. With the stock last traded at Rs 338, up 4.5% on the session, the move looks tied to investors marking up the company’s growth and margin potential in EHV cables, even though the filing itself stops short of quantifying the profit impact.