Cement, automobiles and shipbuilding

Detail

1. Cement industry: what it is and why it matters

• Cement is a grey powder. When mixed with water, sand and gravel, it sets hard into concrete.
• It is needed for houses, factories, bridges, roads, airports and dams. Its demand goes up and down with building activity.
• Raw materials: limestone (the main one), silica and gypsum.
• Other needs: coal (to fire the kilns), electric power and rail transport to move bulky raw material and finished cement.
• India's cement industry is the second largest in the world. Installed capacity was 600 million tonnes and production was 391 million tonnes in 2022-23 [2].
• Capacity has grown over time: 502 million tonnes (2016-17) → 537 million tonnes (2020-21) → 600 million tonnes (2022-23) [2].
• Because building activity rises and falls, the Department for Promotion of Industry and Internal Trade (DPIIT) set up a CIS portal (an online system) to collect cement production data directly from plants [2].

2. Why cement plants sit near limestone

• Cement is a "weight-losing" industry. A weight-losing industry is one whose raw materials are much heavier than the finished product.
• Limestone is heavy and bulky.
• A lot of its weight is lost as gas when it is burnt in the kiln.

• Carrying limestone a long way would cost far more than carrying the cement, so the plant is built at the quarry.

• Result: cement plants form clusters on limestone belts. Coal and power are brought in by rail.

Cluster	State	Location logic
Satna-Katni and Rewa	Madhya Pradesh	Vindhyan limestone; rail links to north India
Chandrapur	Maharashtra	Limestone plus nearby coal (Wardha valley)
Bilaspur-Raipur	Chhattisgarh	Limestone plus coal; serves eastern and central markets
Chittorgarh	Rajasthan	Large limestone deposits in the Aravalli region
Kurnool-Nalgonda belt	Andhra Pradesh–Telangana	Limestone in the Cuddapah–Kurnool rocks of the Deccan
Gujarat coast	Gujarat	Close to ports; plants sited for export to Gulf markets (Middle East and Africa)

3. History and blended cement

• First cement plant: Chennai (then Madras), 1904.
• Blended cement is ordinary cement mixed with industrial waste that has cement-like properties:
• Fly ash comes from coal-fired thermal power stations. It is used to make Portland Pozzolana Cement (PPC).
• Slag comes from the blast furnaces of iron and steel plants. It is used to make Portland Slag Cement (PSC).
• Why it matters: less limestone is mined, less CO₂ is released from kilns, and power-plant and steel-plant waste is reused.
• Spatial effect: some grinding units are now built next to thermal power plants and steel plants, not only at limestone quarries.

4. Automobile industry: growth

• The industry makes trucks, buses, cars, motorcycles, scooters, three-wheelers and multi-utility vehicles.
• According to NCERT, the industry grew strongly after liberalisation (1991). New models came in and raised demand.
• Vehicle production grew from 2 million (1991-92) to about 28 million (2023-24) [3].
• The automobile sector adds about 6% of India's GDP [3].
• Exports: 4.5 million vehicles (FY 2023-24) [3].
• Global standing [3]:
• largest manufacturer of three-wheelers in the world
• among the top 2 manufacturers of two-wheelers (India is often called the largest two-wheeler maker)

• among the top 4 manufacturers of passenger vehicles

• India is also among the world's largest vehicle markets.

5. Automobile centres and clusters

• NCERT centres: Delhi, Gurugram, Mumbai, Pune, Chennai, Kolkata, Lucknow, Indore, Hyderabad, Jamshedpur and Bengaluru.
• Major present-day clusters:

Cluster	State	Key feature
Gurugram-Manesar (NCR)	Haryana	Maruti Udyog started in 1983 (Gurugram); large northern market
Pune-Chakan	Maharashtra	Engineering base, skilled labour, close to Mumbai port
Chennai-Sriperumbudur	Tamil Nadu	Called the "Detroit of Asia"; port access (Chennai, Ennore) for exports
Sanand	Gujarat	Newer cluster near Ahmedabad; Gujarat ports
Hosur-Bengaluru	Tamil Nadu–Karnataka	Two-wheelers and components; skilled workforce
Jamshedpur	Jharkhand	Commercial vehicles; next to steel supply (TISCO)

• Key location factor: agglomeration economies. These are cost savings firms get by locating close together.
• Component suppliers set up near the car makers.
• A pool of skilled labour, training institutes and services grows around them.

• Each new firm gains from what already exists, so the cluster keeps growing.

• Auto components are a big part of this cluster economy:

• 2.3% of GDP and 1.5 million direct jobs [3]
• US$ 21.2 billion of exports in FY24 [3]

6. Electric vehicles (EVs) and policy

• 4.4 million EVs had been registered, with 6.6% market penetration, i.e. 6.6% of new vehicles sold were electric (PIB, 2025) [3].
• PLI-Auto was notified on 23 September 2021, with ₹25,938 crore [3]. PLI means Production Linked Incentive: the government pays a reward linked to extra output.
• The PLI for Advanced Chemistry Cell (ACC) batteries was approved on 12 May 2021, with ₹18,100 crore [3].
• The PM E-DRIVE scheme supports buying and making EVs [3].
• EV manufacturing is concentrating in Tamil Nadu, Karnataka and Maharashtra. These states already have auto clusters, component suppliers and ports.

7. Shipbuilding: why and where

• Shipbuilding is called the "mother of heavy engineering". It draws on steel, engines, electronics and many small suppliers [5].
• About 95% of India's trade by volume moves by sea [5].
• India's ship-making history is very old. Lothal (Gujarat), a Harappan site, has one of the world's earliest known tidal docks [5].
• Location needs: a coastal site with deep, sheltered water, a steel supply, skilled labour and naval or port demand.
• After independence, shipbuilding stayed mostly in public sector yards [5].
• As of November 2024, India had 1,552 Indian-flagged vessels with a total of 13.65 million GT [5]. Gross Tonnage (GT) measures a ship's total inside volume.

Shipyard	City, state / coast	Known for
Cochin Shipyard	Kochi, Kerala (west coast)	Built INS Vikrant, India's first home-built aircraft carrier
Mazagon Dock Shipbuilders	Mumbai, Maharashtra (west coast)	Submarines and destroyers
Garden Reach Shipbuilders & Engineers	Kolkata, West Bengal (on the Hooghly)	Warships and patrol vessels
Hindustan Shipyard	Visakhapatnam, Andhra Pradesh (east coast)	Ships and naval vessels
Goa Shipyard	Vasco da Gama, Goa (west coast)	Patrol vessels

8. INS Vikrant (case study)

• Keel laid at Cochin Shipyard in February 2009. Laying the keel (the ship's backbone) marks the formal start of construction [6].
• Commissioned (put into naval service) on 2 September 2022, in Kochi [6].
• Designed by the Navy's Warship Design Bureau [6].
• Size: 262.5 m long, about 45,000 tonnes [6].
• 76% indigenous content (made in India), including 30,000 tonnes of SAIL steel [6].
• Supply chain: over 550 OEMs and 100 MSMEs were involved. This is agglomeration at work [6].
• It uses the STOBAR system (Short Take-Off But Arrested Recovery): planes take off from a ski-jump and land by catching arrester wires [6].

9. The shipbuilding gap and the 2025 maritime package

• India's share of world shipbuilding is tiny. Most ships are built in China, South Korea and Japan.
• September 2025: the Union Cabinet approved a ₹69,725 crore package with four pillars [4][5]:
• Shipbuilding Development Scheme (SbDS), ₹19,989 crore [4]:
  • aims to raise capacity to 4.5 million GT a year
  • proposes greenfield shipbuilding clusters in Andhra Pradesh, Gujarat and Tamil Nadu
  • greenfield means built on new, unused land
• Maritime Development Fund, ₹25,000 crore [4].
• Shipbuilding Financial Assistance Scheme (SBFAS), ₹24,736 crore, extended to 31 March 2036 [4][5].

• Legal, tax and policy reforms [4].

• Expected results: about 30 lakh jobs and about ₹4.5 lakh crore of investment [4].

• New capacity, especially in Tamil Nadu:
• Cochin Shipyard and Mazagon Dock signed MoUs with Tamil Nadu agencies. These include a ₹15,000 crore yard with 1 million GT a year capacity [5].

• Cochin Shipyard has partnered with HD Korea Shipbuilding to build large commercial ships [5].

• Demand support:

• Ships under ₹200 crore must be bought from Indian yards [5].

• Large ships have been given infrastructure status, which makes long-term loans easier to get [5].

• Target: India in the top five shipbuilding nations by 2047 [5].

Prelims Hooks

• India's first cement plant: Chennai, 1904.
• India is the second largest cement producer in the world. Capacity was 600 million tonnes and production 391 million tonnes in 2022-23.
• Cement cluster–state pairs: Satna-Katni and Rewa → MP; Chandrapur → Maharashtra; Bilaspur-Raipur → Chhattisgarh; Chittorgarh → Rajasthan.
• Fly ash (thermal power stations) is used for PPC. Slag (steel blast furnaces) is used for PSC.
• "Detroit of Asia" = Chennai-Sriperumbudur (Tamil Nadu), not Pune or Gurugram.
• Maruti began production at Gurugram in 1983.
• Trap: India is the largest maker of three-wheelers. Officially it ranks among the top 2 for two-wheelers and top 4 for passenger vehicles.
• INS Vikrant: built at Cochin Shipyard, commissioned 2 September 2022, STOBAR carrier, 76% indigenous content.
• Shipyard–city pairs: Mazagon → Mumbai; Garden Reach → Kolkata; Hindustan Shipyard → Visakhapatnam; Cochin → Kochi.
• The 2025 maritime package (₹69,725 crore) proposes greenfield shipbuilding clusters in Andhra Pradesh, Gujarat and Tamil Nadu.

Mains Points

• Raw-material vs market vs agglomeration location (GS-I):
• Cement is tied to bulky, weight-losing limestone, so it is raw-material oriented.
• Gujarat cement plants are oriented to ports and export markets.
• Automobiles depend on agglomeration: suppliers, skilled labour and ports, as at Chennai, Pune and NCR.

• Shipbuilding needs coastal sites, steel and assured naval or port demand.

• Industrial symbiosis and sustainability (GS-III):

• Blended cement uses fly ash and slag, which cuts limestone mining and kiln CO₂.
• This links the cement, thermal power and steel industries.

• Tamil Nadu, Karnataka and Maharashtra are drawing EV and battery plants under PLI-Auto (₹25,938 crore) and PLI-ACC (₹18,100 crore). This could deepen regional imbalance in favour of the southern and western states.

• Shipbuilding as a strategic gap (GS-III):

• About 95% of trade by volume moves by sea, but India's share of world shipbuilding is tiny.
• Indian yards face high costs, little long-term finance and few large docks.

• Policy response: the ₹69,725 crore package (2025), new clusters in AP, Gujarat and TN, infrastructure status for large ships, and buy-Indian rules. The target is the top five by 2047.

• Liberalisation and regional growth:

• Vehicle output rose from 2 million (1991-92) to about 28 million (2023-24).
• Growth after 1991 concentrated in a few corridors: NCR, Pune–Mumbai, Chennai–Bengaluru–Hosur and Ahmedabad–Sanand.
• This shows how clusters keep reinforcing themselves.