Why in News
On April 30, 2026, Mazagon Dock Shipbuilders Limited (MDL), Mumbai, handed over INS Mahendragiri (hull Y-12654) to the Indian Navy — marking the delivery of the sixth Project 17A stealth frigate overall and completing MDL’s quota of four ships under the project. This also marks the 100th vessel milestone for the Warship Design Bureau (WDB), the Navy’s in-house design organisation. Project 17A’s three GRSE-built ships remain on track.
Project 17A (Nilgiri-class Frigates) — Overview
Project 17A is a follow-on to Project 17 (Shivalik-class frigates) and represents India’s most advanced indigenous warship construction programme.
| Attribute | Detail |
|---|---|
| Class | Nilgiri-class stealth frigates |
| Project | Project 17A |
| Total ships | 7 (4 from MDL + 3 from GRSE) |
| Design authority | Warship Design Bureau (WDB), Indian Navy |
| Lead ship | INS Nilgiri |
| Classification | GS-guided missile stealth frigates |
| Stealth features | Reduced radar cross-section (RCS), angled superstructure, radar-absorbent material |
| Key systems | BrahMos supersonic cruise missile, Barak-8 SAM, Advanced Torpedo Launch System, hull-mounted sonar, towed array sonar |
| Propulsion | COGAG (Combined Gas and Gas) |
P17A Delivery Status
| Ship | Builder | Delivered |
|---|---|---|
| INS Nilgiri (Y-12651) | MDL | December 20, 2024 |
| INS Himgiri (Y-12652) | MDL | 2025 |
| INS Udaygiri (Y-12653) | MDL | 2025 |
| INS Mahendragiri (Y-12654) | MDL | April 30, 2026 |
| INS Dunagiri (Y-12655) | GRSE | On trials |
| INS Vindhyagiri (Y-12656) | GRSE | On trials |
| INS Taragiri (Y-12657) | GRSE | Under construction |
Note: GRSE = Garden Reach Shipbuilders & Engineers, Kolkata
INS Mahendragiri — Key Details
- Named after: Mahendragiri mountain peak in the Eastern Ghats, Odisha (altitude ~1,501 m; one of the highest peaks in Odisha)
- Hull number: Y-12654
- Builder: Mazagon Dock Shipbuilders Limited (MDL), Mumbai
- Delivery: April 30, 2026
- Significance: Completes MDL’s Project 17A quota; 100th vessel milestone for Warship Design Bureau
Mazagon Dock Shipbuilders Limited (MDL)
| Parameter | Detail |
|---|---|
| Location | Mumbai, Maharashtra |
| Ownership | Government of India (Ministry of Defence); listed PSU (IPO: 2020) |
| Category | Defence Public Sector Undertaking (DPSU) |
| Major products | Frigates (P17/P17A), Destroyers (P15A/P15B), Submarines (Scorpène — P75) |
| Current projects | P17A (frigates), P75 Scorpène submarines (6 delivered), P75I (future submarine) |
| Shipyard area | ~51 hectares; wet basin capacity for simultaneous construction |
Warship Design Bureau (WDB)
- Parent organisation: Indian Navy
- Role: Indigenous design of warships — from concept to final design — reducing dependence on foreign design houses
- 100th vessel milestone: INS Mahendragiri is the 100th vessel built to WDB designs, spanning frigates, destroyers, corvettes, and auxiliary vessels
- Successor to the Directorate of Naval Design, elevated to Bureau status to reflect expanded role
India’s Naval Indigenisation — Context
India’s warship indigenisation has progressed significantly under Aatmanirbhar Bharat in defence:
| Programme | Ships | Significance |
|---|---|---|
| Project 15B (Visakhapatnam-class destroyers) | 4 ships | Most advanced destroyers; guided missile |
| Project 17A (Nilgiri-class frigates) | 7 ships | Current programme; stealth frigates |
| Project 28 (Kamorta-class corvettes) | 4 ships | Anti-submarine warfare |
| Project 75 (Scorpène submarines) | 6 submarines | MDL + DCNS (France); all delivered by 2024 |
| Project 75I (future submarines) | 6 submarines | AIP-equipped; vendor selection ongoing |
| INS Vikrant (IAC-1) | Carrier | First indigenous aircraft carrier; commissioned Sept 2022 |
UPSC Relevance
| Paper | Angle |
|---|---|
| GS3 — Security | Naval modernisation, Project 17A, indigenisation |
| GS3 — Economy | Defence PSUs, MDL as listed DPSU, Aatmanirbhar Bharat in defence |
| GS2 — Governance | DPSUs, defence procurement policy |
Mains Keywords: INS Mahendragiri, Project 17A, Nilgiri-class frigates, Mazagon Dock Shipbuilders (MDL), Warship Design Bureau, stealth frigate, naval indigenisation, Aatmanirbhar Bharat, BrahMos missile, Garden Reach Shipbuilders (GRSE)
Prelims Facts Corner
| Item | Fact |
|---|---|
| INS Mahendragiri | 6th P17A ship; MDL’s 4th; delivered April 30, 2026 |
| Class | Nilgiri-class stealth frigates (Project 17A) |
| Named after | Mahendragiri mountain, Eastern Ghats, Odisha |
| Total P17A ships | 7 (4 MDL + 3 GRSE) |
| Lead ship | INS Nilgiri; delivered December 20, 2024 |
| Warship Design Bureau | 100th vessel milestone; Indian Navy’s design arm |
| MDL | Mumbai; Defence PSU; listed (IPO 2020) |
| Project 75 | Scorpène submarines; 6 delivered; MDL + DCNS |
| INS Vikrant | First indigenous aircraft carrier; commissioned Sept 2022 |
