Navy, Germany’s TKMS wrap up cost negotiations for new submarines, P-75I deal likely early next fiscal

What Happened

• The Indian Navy and German firm Thyssenkrupp Marine Systems (TKMS) have concluded cost negotiations for Project 75(India), commonly referred to as P-75I, clearing a major procedural hurdle for the acquisition of six advanced conventional submarines.
• The Cost Negotiation Committee finalized the project valuation in the range of ₹66,000–70,000 crore (approximately $8–9 billion), significantly lower than the original bid of over ₹1.2 lakh crore submitted jointly by TKMS and Mazagon Dock Shipbuilders Limited (MDL).
• The deal — likely to be formally signed in early fiscal year 2026–27 — will see all six submarines built at MDL's Mumbai shipyard under the Strategic Partnership model, incorporating Air Independent Propulsion (AIP) technology based on an advanced variant of TKMS's Type 214 design.
• The contract mandates 45% indigenous content for the first submarine, rising to 60% by the sixth vessel, aligning with Atmanirbhar Bharat objectives in defence manufacturing.
• The first submarine is scheduled for delivery seven years after contract signing, with one submarine per year thereafter.
• TKMS will serve as the design authority and technology partner, providing engineering support and transfer of critical technologies including the AIP system.

Static Topic Bridges

Project 75 and India's Submarine Acquisition Architecture

India's submarine acquisition follows a two-tier structure — Project 75 (P-75) and Project 75(India) (P-75I) — designed to progressively build indigenous submarine manufacturing capacity.

P-75 resulted in the Kalvari-class submarines, built at MDL in collaboration with France's Naval Group (formerly DCNS) using the Scorpène design. The contract was signed in 2005 and the first boat, INS Kalvari, was commissioned in December 2017. All six Kalvari-class submarines are now in service, giving the Indian Navy its first modern conventionally-powered submarine fleet.

P-75I is the follow-on programme, conceived to go further — requiring more indigenous content, more advanced technology (particularly AIP), and a full technology transfer arrangement under the Strategic Partnership model. The Strategic Partnership policy (introduced under DPP 2016, formalized in 2017) requires a designated Indian private/public sector firm to partner with a foreign OEM, with the OEM obligated to transfer critical technologies so the Indian entity can manufacture the platform domestically.

Air Independent Propulsion (AIP) Technology

AIP refers to a propulsion system that allows a conventional (non-nuclear) submarine to operate its engines without access to atmospheric oxygen. Conventional diesel-electric submarines must surface or use a snorkel to run diesel generators for battery recharging, limiting submerged endurance and increasing detection risk.

The Type 214's AIP system uses Proton Exchange Membrane (PEM) fuel cells powered by liquid hydrogen and liquid oxygen stored on board. This electrochemical process generates electricity directly, with water as the only by-product. AIP-equipped submarines can remain submerged for up to three weeks without surfacing, compared to 3–5 days for conventional diesel-electric boats.

AIP submarines occupy a strategic niche between conventional diesel-electric submarines and nuclear-powered submarines (SSNs/SSBNs). They are quieter than SSNs at low speeds and are best suited for littoral (coastal/shallow water) and sea-denial operations. For a navy like India's operating in the Indian Ocean Region with a focus on the Arabian Sea and Bay of Bengal approaches, AIP submarines offer a cost-effective deterrent against both surface and underwater threats.

Atmanirbhar Bharat in Defence Manufacturing

Atmanirbhar Bharat (Self-Reliant India) in defence has a specific policy architecture distinct from general economic self-reliance. The Ministry of Defence operationalizes it through several mechanisms:

• Positive Indigenisation Lists: Items that can no longer be imported; domestic procurement mandated. Three lists published since 2020, covering over 500 items including helicopters, artillery, aircraft carriers.
• Defence Acquisition Procedure (DAP) 2020: Prioritizes procurement categories — "Buy Indian-IDDM" (highest preference) → "Buy Indian" → "Buy & Make Indian" → "Buy & Make (Global)" → "Buy Global."
• Strategic Partnership Model: Requires foreign OEMs to partner with Indian firms and transfer technology for select high-value platforms (submarines, helicopters, fighter aircraft, armoured vehicles).
• iDEX (Innovations for Defence Excellence): Funds startups and MSMEs for defence innovation.
• Defence Corridors: Uttar Pradesh (Lucknow-Agra) and Tamil Nadu (Chennai-Coimbatore) corridors as industrial clusters.

India-Germany Strategic Partnership in Defence

India and Germany established a Strategic Partnership in 2001 and have progressively deepened defence ties. Germany is one of the few European nations with which India has structured defence-industrial cooperation.

The P-75I selection of TKMS reflects a broader strategic logic — Germany is a Tier-1 submarine technology nation (Type 212 and Type 214 submarines operate across Europe and Asia-Pacific), and the deal diversifies India's submarine technology base beyond the France-Russia axis that characterized earlier procurement. India has Scorpène submarines from France (P-75) and Kilo-class (Sindhughosh-class) from Russia.

Germany has been cautious about arms exports historically, particularly to regions of active conflict, but India's non-belligerent status and the civilian manufacturing character of the deal facilitate approval.

Key Facts & Data

• Deal value: ₹66,000–70,000 crore (~$8–9 billion); original bid was over ₹1.2 lakh crore
• Number of submarines: 6 conventional diesel-electric AIP submarines
• Design basis: Advanced variant of TKMS Type 214 (Type 214/212CD lineage)
• Builder: Mazagon Dock Shipbuilders Limited (MDL), Mumbai — as Strategic Partner
• Technology partner: TKMS (Thyssenkrupp Marine Systems), Germany
• AIP system: Proton Exchange Membrane (PEM) fuel cell; up to 3 weeks submerged endurance
• Indigenization: 45% local content for first submarine → 60% by sixth
• Delivery timeline: First submarine 7 years after contract signing; one per year thereafter
• P-75 predecessor: 6 Kalvari-class (Scorpène-type) submarines, French-origin, all now commissioned
• Strategic Partnership model: Established under DPP 2016; mandates Indian SP firm + foreign OEM + technology transfer
• India's submarine fleet: Currently ~15 submarines (diesel-electric + SSBNs); P-75I will add 6 more with AIP
• India-Germany Strategic Partnership: Established 2001; deepened in 2015 Joint Declaration on Defence