Bagging/Receiving of orders/contracts

DIAMOND POWER INFRASTRUCTURE LIMITED September 15, 2026 To, To, The Manager – Listing Department The Manager – Listing Department BSE Limited National Stock Exchange of India Ltd. Phiroze Jeejeebhoy Towers, Exchange Plaza, C-1, Block G, BKC, Dalal Street, Mumbai – 400 001 Bandra (East), Mumbai – 400 051 Scrip Code: 522163 Symbol: DIACABS Sub.: Intimation under Regulation 30 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015 – Receipt of a Letter of Award for supply of specialised MV cables Dear Sir/Madam, Pursuant to Regulation 30 of the SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015 (“Listing Regulations”), read with SEBI Master Circular on compliance with the provisions of the Listing Regulations by listed entities, we wish to inform you that Diamond Power Infrastructure Limited (“the Company”) has received a Letter of Award from Adani Electricity Mumbai Limited dated 3rd September 2026 for supply of specialised MV cables. A copy of the Press Release being issued by the Company in this regard is enclosed as Annexure A.The details required under Regulation 30 of the Listing Regulations, read with the applicable SEBI Circular, are enclosed as Annexure B. This intimation is also being made available on the website of the Company at www.dicabs.com. You are requested to kindly take the above on record. Thanking you, Yours faithfully, For Diamond Power Infrastructure Limited Jayesh Patel Company Secretary ICSI M. No.: A14898 Encl.: Annexure A – Press Release Annexure B – Disclosure under Regulation 30 Regd. Office & Factory: Vadadala, Phase – II Savli, Vadodara, Gujarat, India-391520 CIN: L31300GJ1992PLC018198 Email: cs@dicabs.com, Website: www.dicabs.com Tel No.- 02667-251354/251516 Fax No.-02267-251202 DIAMOND POWER INFRASTRUCTURE LIMITED Annexure B PRESS RELEASE Diamond Power Infrastructure Limited receives Letter of Award of ₹179.43 crore (inclusive of GST) from Adani Electricity Mumbai Limited for specialised MV cables Order covers water-tree retardant (TR-XLPE) medium voltage cables with longitudinal and radial water-blocking construction, engineered for Mumbai's coastal and monsoon conditions Vadodara, 15th September 2026, Diamond Power Infrastructure Limited (DPIL), one of India's leading manufacturers of MV and EHV power cables, has received a Letter of Award from Adani Electricity Mumbai Limited (AEML) for the supply of additional medium voltage and low voltage underground power cables for the Mumbai distribution network. The award is valued at ₹179.43 crore inclusive of GST and covers approximately 871 kms of cable in aggregate — 33 kV and 11 kV medium voltage cable together with associated 1.1 kV low voltage cable. Prices are inclusive of packing and forwarding and of freight and transit insurance. The formal purchase order is to be issued by the customer against this Letter of Award. This is the third consecutive year in which DPIL has been awarded this contract. The repeat award reflects AEML's assessment of the Company's catenary continuous vulcanisation (CCV) manufacturing capability, its in-house testing infrastructure and its record of delivery performance on the Mumbai network. DPIL is also an established supplier of power cables to BEST (Brihanmumbai Electric Supply & Transport Undertaking), the city's other major distribution utility. The technical specification and why Mumbai requires it The cables under this award are not standard catalogue products. They are built to a special construction specified for Mumbai — tree-retardant cross-linked polyethylene (TR-XLPE) insulation, water-blocked conductors, water-swellable tapes for longitudinal water blocking, and an HDPE outer sheath as a radial moisture barrier. Regd. Office & Factory: Vadadala, Phase – II Savli, Vadodara, Gujarat, India-391520 CIN: L31300GJ1992PLC018198 Email: cs@dicabs.com, Website: www.dicabs.com Tel No.- 02667-251354/251516 Fax No.-02267-251202 DIAMOND POWER INFRASTRUCTURE LIMITED The operating environment. Mumbai presents one of the most aggressive environments for underground power cables in India. The city is coastal, low-lying and densely built. The water table sits close to the surface across much of the island city and the western suburbs. Annual rainfall regularly exceeds 2,000 mm, concentrated into a short and intense monsoon. Cable trenches, ducts and joint bays in many locations hold standing water for months at a time, and the atmosphere carries a persistent saline load. For a significant part of its service life, an underground distribution cable in Mumbai operates effectively submerged while carrying continuous electrical stress. The failure mechanism. Where moisture reaches the insulation of a cable operating under an alternating electric field, it initiates a degradation mechanism known as water treeing. Microscopic voids, contaminants or interface imperfections act as initiation points, and under sustained electrical stress in the presence of moisture these develop into diffuse, branching, water-filled channels that propagate through the insulation wall. Water trees do not cause immediate failure — which is what makes them serious. They erode dielectric strength progressively and invisibly over years, until the cable can no longer withstand a routine switching surge. The failure, when it comes, occurs in service and is expensive to locate and repair in a congested urban network. The engineered response. Four elements work as a system: • TR-XLPE insulation is formulated with additives that suppress both the initiation and the growth rate of water trees, sustaining dielectric strength over a multi-decade service life in wet-operating networks where conventional XLPE would degrade. • Water-swellable tapes, applied over the metallic screen, contain superabsorbent polymers that expand on contact with water. If the outer sheath is breached by excavation or mechanical damage, the tape seals at the point of ingress and prevents water migrating longitudinally along the cable core — confining damage that would otherwise contaminate hundreds of metres to a short, repairable section. • Water-blocked conductors close off the interstitial paths between strands, eliminating the conductor as an internal route for moisture to reach the insulation. • HDPE outer sheathing offers substantially lower moisture permeability than conventional sheathing materials, providing the primary radial barrier. Manufacturing discipline. Water tree resistance is only partly a function of compound selection; it is equally a function of how cleanly the insulation is applied, since trees initiate at voids and at Regd. Office & Factory: Vadadala, Phase – II Savli, Vadodara, Gujarat, India-391520 CIN: L31300GJ1992PLC018198 Email: cs@dicabs.com, Website: www.dicabs.com Tel No.- 02667-251354/251516 Fax No.-02267-251202 DIAMOND POWER INFRASTRUCTURE LIMITED imperfections in the screen-to-insulation interface. DPIL manufactures these cables on catenary continuous vulcanisation lines using triple-extrusion heads, dry-cure crosslinking, clean-room compound handling and controlled degassing. The Company's in-house testing infrastructure supports type, routine and special testing across the MV range, including partial discharge measurement — the primary diagnostic for the interface defects that seed water trees. Building scale and leadership in the MV cables industry India's medium voltage cable demand is being driven by three converging forces — the conversion of urban distribution networks from overhead to underground, the connection of large- scale renewable generation and evacuation infrastructure, and the rapid build-out of data centres and industrial capacity. Each of these requires MV cable of a quality and in a volume that the domestic industry has not previously had to supply. Diamond Power has been positioning its manufacturing base against that demand. The Company operates an integrated facility at Vadodara, Gujarat a Facility t [Showing first 8,000 characters — download PDF for full document]