Indian Oil Corporation is India's largest energy company by revenue and the anchor of the state's downstream oil system. It owns ten group refineries with 80.75 MMTPA of capacity (roughly 31% of national capacity), a pipeline grid exceeding 20,000 km that moved 102.5 MMT of crude and products in FY26, and the country's largest fuel-retail footprint at 42,818 outlets. It sold more than 105 MMT of petroleum products, natural gas and petrochemicals in FY26 and holds roughly 43% of domestic product sales. Majority-owned by the Government of India, it operates under a de facto administered-pricing regime for petrol, diesel and household LPG, which makes earnings highly sensitive to crude prices and policy. Its strategic agenda, branded "Project SPRINT", combines a ~17 MMTPA refinery expansion due by December 2026, a pivot toward petrochemicals, gas and lubricants, and a net-zero (Scope 1&2) commitment for 2046 backed by renewable, hydrogen, biofuel and SAF investments.
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### What the company does
IndianOil is a vertically integrated hydrocarbon company spanning the full downstream chain and selected upstream and new-energy activities:
1. **Refining** — Nine standalone refineries (Digboi, Guwahati, Barauni, Gujarat/Vadodara, Haldia, Mathura, Panipat, Bongaigaon, Paradip) plus Chennai Petroleum Corporation Ltd (CPCL, Manali) as a listed subsidiary, giving group capacity of 80.75 MMTPA. FY26 standalone crude throughput was a record 75.45 MMT at 107.4% of installed capacity (FY26 Integrated Annual Report, Chairman's Communiqué). The crude basket spans about 275 grades (Corporate Brochure 2026).
2. **Pipelines** — A network of over 20,000 km (20,005 km at 31-Mar-2025 per the FY25 Directors' Report) carrying crude, products and gas; FY26 liquid throughput was a record 102.52 MMT versus 96.92 MMT in FY25.
3. **Fuel marketing** — Retail (42,818 outlets at 31-Mar-2026 after adding 2,635 in FY26), LPG (Indane brand; >2.7 million cylinders delivered daily), aviation fuel (refuelling more than half of flights in Indian skies, per the brochure), lubricants (SERVO), bitumen, bunkers, industrial and institutional sales. Domestic petroleum sales were a record 88.97 MMT in FY26 (FY25: 84.96 MMT).
4. **Petrochemicals** — Polymers (PP, PE), fibre intermediates (PX/PTA, MEG), LAB, PBR, butadiene, benzene, and since FY26 acrylics/oxo-alcohols; record sales of 3.40 MMT in FY26. The company describes itself as India's second-largest petrochemical player.
5. **Natural gas** — LNG import (5 MMTPA Ennore terminal via a group company), gas marketing (record 7.09 MMT in FY26 excluding captive use; 9.01 MMT including captive), gas pipelines and City Gas Distribution (49 geographical areas covering 106 districts across 21 states/UTs).
6. **Exploration & Production** — 24 assets at March 2026 (14 domestic, 10 overseas); IndianOil's share of FY26 production was 4.49 MMToe (Corporate Brochure 2026).
7. **Alternative energy and other** — Renewables via wholly-owned Terra Clean Ltd and JV IndianOil NTPC Green Energy (INGEL); green hydrogen (10 KTA plant under construction at Panipat); SAF (ISCC CORSIA-certified at Panipat); compressed biogas (49+ plants); ethanol blending (~20%); EV charging/battery swapping (~15,000 points; 1,649 swap stations via IndoFast Swap Energy JV); explosives (13 plants) and cryogenics; EPCM services (3,000+ km of external pipeline projects under execution).
### Business and revenue model
IndianOil's revenue is overwhelmingly product sales (commodity volume × realised price), not services, subscriptions or licensing. In FY26 the Petroleum Products segment generated ₹8,42,195 cr of gross segment revenue out of ₹9,20,097 cr total segment revenue before inter-segment eliminations (91.5%), Gas ₹44,512 cr (4.8%), Petrochemicals ₹28,102 cr (3.1%) and Other Business Activities ₹5,288 cr (0.6%) (FY26 consolidated results, NSE). Service-type income (pipeline tariffs from third parties, EPCM, technology licensing by R&D, non-fuel retail) exists but is not separately material in reported segments.
The economics are best understood as three margin pools:
**Refining margin (GRM):** product crack spreads minus crude cost; IOC's reported GRM swings with crude benchmarks and inventory valuation (FY24 $12.05/bbl; FY25 $4.80/bbl; April–December 2025 $8.41/bbl; Q1 FY27 $15.59/bbl net of special additional excise duty).
**Marketing margin:** retail price minus refinery-gate/import-parity price. Petrol and diesel are formally deregulated but in practice retail prices are held stable through government signalling, so marketing margins expand when crude falls and turn negative when crude spikes. Domestic LPG is explicitly administered, generating "under-recoveries" recorded in a buffer account and periodically compensated by the government.
**Logistics/network margin:** pipeline and terminal infrastructure that lowers delivered cost and creates a structural cost advantage versus private marketers.
### Value-chain position and customers
IndianOil sits mid-to-downstream: it buys crude (mostly imported, increasingly diversified away from West Asia after the 2026 Hormuz disruption), refines, transports and sells to end-users. Customer types: retail motorists (3.6 crore customers served daily at fuel stations per the brochure), households (Indane LPG), airlines, Indian Armed Forces, railways and state transport undertakings, industrial and bulk buyers, fertiliser plants (gas), road builders (bitumen — enough for ~130 km of road daily), shipping (bunkers), petrochemical converters (polymers), mining companies (explosives), and city-gas consumers. End-markets: transportation, household cooking energy, aviation, industry, agriculture, power, construction and packaging/textiles.
### Company's self-description vs independent characterisation
The FY26 Integrated Annual Report presents IndianOil as India's flagship integrated energy company, emphasising its Maharatna status, its role in national energy security (including uninterrupted supplies during Operation Sindoor and the 2026 Strait of Hormuz disruption), and its transformation toward a diversified, "future-ready" energy group via Project SPRINT.
Independently characterised, IndianOil is a quasi-sovereign, policy-constrained downstream utility with cyclical commodity upside. Its scale and infrastructure are unmatched domestically, but its pricing autonomy is limited: earnings in a given year are determined less by operating performance (which has been at record levels) than by the interplay of crude prices, government retail-price decisions, excise policy and LPG compensation. FY26 (record ₹36,802 cr standalone PAT) and Q1 FY27 (₹2,661 cr standalone loss despite record throughput) illustrate this dependency vividly.