India's natural gas vehicle boom — CNG economics, infrastructure, and what it means for petrol demand

Scale of India's CNG fleet

India ranks third globally for CNG vehicle numbers, behind China (~10 million) and Iran (~4.5 million). By mid-2024 the fleet had crossed 7 million vehicles, concentrated in Delhi-NCR, Mumbai, Ahmedabad, Pune, and other cities covered by the city gas distribution (CGD) network. The growth has been rapid: from under 3 million CNG vehicles in 2018 to over 7 million by 2024, driven by Supreme Court mandates (starting with Delhi in 2001), rising petrol prices, and significant expansion of CNG station infrastructure.

The PPAC CNG retail price tracker and the Petroleum and Natural Gas Regulatory Board (PNGRB) publish city-by-city CNG price data. Indraprastha Gas Limited (IGL) serves Delhi, Mahanagar Gas (MGL) serves Mumbai, and Gujarat Gas serves the Surat-Ahmedabad corridor — the three largest CGD markets. For a detailed explanation of how CNG is measured and priced as a vehicle fuel, see our CNG glossary entry.

CNG vs petrol: the price gap

The economic case for CNG in India is compelling. In mid-2024, the approximate comparison in Delhi looked like this:

The cost advantage per kilometre is roughly 50–60 % versus petrol and 30–40 % versus diesel, making CNG attractive for high-mileage users — auto-rickshaws, taxis, and fleet operators — who can recover the CNG conversion cost (INR 15,000–25,000 for a retrofit) within months. Factory-fitted CNG variants (from Maruti Suzuki, Hyundai, Tata Motors) have grown rapidly as a share of new car sales, accounting for over 25 % of Maruti's volume by 2024.

CNG pricing in India is set by each city gas distribution company based on gas procurement costs — domestic APM (administered price mechanism) gas and imported LNG blended together. India's domestic gas price is set by the government every six months using a formula linked to international gas benchmarks. The Ministry of Petroleum and Natural Gas publishes APM gas prices biannually.

City gas distribution network

India's CGD expansion is one of the most ambitious energy infrastructure programmes in the world. The PNGRB has issued CGD licences for 630 geographical areas (GAs) covering all 36 states and union territories. The licensees are required to build a specified number of CNG stations and lay a minimum pipeline network within a defined timeline, in exchange for an exclusive right to supply CNG and piped natural gas (PNG) to households in their zone.

By mid-2024 India had approximately 6,500 CNG stations, compared with around 3,500 in 2020. The government's target of 10,000+ stations by 2026 is achievable if investment continues at the current pace. GAIL (India) Limited, the national gas transmission company, plays a key role in providing gas to CGD companies via its national pipeline network, and has a JV interest in multiple CGD entities.

The CGD network also supplies piped natural gas (PNG) to households for cooking, which reduces LPG cylinder demand. India's LPG market — one of the world's largest — is showing the first signs of demand moderation in PNG-served urban areas. See our LPG glossary entry for context on LPG as a household and vehicle fuel.

The gas supply challenge

India's CGD ambitions face a structural constraint: domestic gas production has stagnated. Output from the KG-D6 block (operated by Reliance Industries and BP) has recovered from its 2013 low but remains well below peak. India imports approximately 45–50 % of its gas as LNG, primarily from Qatar, the US, and Australia. The gas import bill — priced in USD — is sensitive to global LNG market conditions, as the 2022 price shock demonstrated.

The government's response has been to ring-fence a portion of domestic gas production for CGD use at administered APM prices, effectively subsidising the CNG cost relative to what a pure LNG-import-linked price would imply. This subsidy is implicit (the domestic gas producers receive below-market prices) rather than a direct cash transfer, making it less visible but no less real in its fiscal and economic effects.

The IEA India energy profile projects India's gas demand growing at 5–7 % annually through 2030, with CGD and industrial use as the main growth drivers. LNG import capacity is being expanded — new regasification terminals are planned at Chhara, Jaigarh, and Kamarajar — to handle the projected import volumes.

Impact on petrol demand

India's CNG fleet displaces an estimated 5–7 million litres of petrol and diesel per day — roughly 3–5 % of India's total road transport fuel consumption. As the fleet grows, this displacement will increase, creating a structural headwind for petrol demand growth that is often underestimated in global oil demand forecasts.

The IEA Oil 2024 medium-term outlook highlighted India — alongside China — as one of the two countries whose policy choices will most determine whether global oil demand plateaus in the late 2020s. India's combination of CNG expansion, electric two-wheeler uptake, and urban metro/rail investment is creating a more complex demand picture than a simple GDP-linked extrapolation suggests.

For comparison, our article on China's fuel demand examines a similar story of policy-driven transport fuel substitution at scale. For the economics of alternative fuels more broadly, see our hydrogen fuel economics article and the EV charging costs vs petrol comparison.