CAFE-III Norms - Balancing Fuel Efficiency, Emission Reduction a…

CAFE-III Norms - Balancing Fuel Efficiency, Emission Reduction and Technological Innovation

Oct. 1, 2026

Why in News?

The Ministry of Power notified the third phase of the Corporate Average Fuel Economy (CAFE-III) norms.
The regulations will be implemented from April 1, 2027, to March 31, 2032, requiring automobile manufacturers to progressively improve the fuel efficiency of their passenger vehicle fleets.
The new framework seeks to reduce fuel consumption and carbon dioxide (CO₂) emissions while providing flexibility through multiple technological pathways. It also resolves the contentious debate over special concessions for small cars.

What’s in Today’s Article?

Understanding CAFE Norms:

Introduced in 2017 under the Energy Conservation Act, 2001, CAFE norms regulate the average fuel consumption and CO₂ emissions of a manufacturer's entire passenger vehicle fleet.
Unlike vehicle-specific emission standards, CAFE norms assess the weighted average performance of all eligible vehicles sold by a manufacturer.
CAFE-II came into effect in 2022, while CAFE-III will remain applicable for five years, covering M1-category passenger vehicles manufactured or imported for sale in India.
The framework encourages manufacturers to improve fleet-wide fuel efficiency rather than focusing exclusively on individual models.

Progressively Stricter Fuel Efficiency Targets:

CAFE-III mandates an improvement of approximately 16.7% in fuel efficiency over five years through progressively tightening annual targets.
The annual fuel-consumption target is calculated using the following formula -
- Annual average fuel consumption = a × (W − b) + c
- Where,
  - W: Weighted average unladen weight of a manufacturer's eligible vehicles.
  - b: Reference weight, fixed at 1,229 kg.
  - a: Weight adjustment factor.
  - c: Baseline fuel-consumption target.
- The reference weight has increased from 1,082 kg under the existing norms to 1,229 kg under CAFE-III, reflecting changes in the passenger vehicle fleet.
- The baseline fuel-consumption target will decline from 3.996 litres/100 km in 2027–28 to 3.3273 litres/100 km in 2031–32.
- The revised formula also uses a flatter weight adjustment, allowing different targets based on the average weight of manufacturers' fleets.

Small Cars vs Large Cars - Resolving the Industry Debate:

The treatment of small cars was one of the most contentious aspects of CAFE-III.
The September 2025 draft proposed an additional relaxation of 3 g CO₂/km for petrol cars weighing below 909 kg.
This proposal faced opposition from some manufacturers, including Tata Motors and Mahindra & Mahindra (M&M), who argued that it would disproportionately benefit Maruti Suzuki, which dominates the lightweight car segment.
The final notification has removed the separate 3 g/km concession but revised the weight-adjustment formula to provide relatively favourable targets for lighter vehicles.
Consequently, a small car's target, which would have been 54.1 g/km under the earlier draft, has been relaxed to 63.7 g/km under the final framework.
However, there is no separate regulatory category for cars weighing below 909 kg. The fuel-efficiency target depends on the manufacturer's overall fleet weight.

Incentives for Electric Vehicles and Alternative Fuels:

CAFE-III introduces a super-credit mechanism to encourage cleaner technologies and diversify India's automotive energy mix.
For example, for BEVs and range-extended electric vehicles (REEVs) volume derogation factor is 3. It is 2.5 for plug-in hybrids and strong hybrids running on flex-fuel.
Under this mechanism, one BEV or REEV is counted as three vehicles when calculating fleet performance.
Additional carbon-neutrality factors (CNFs) recognise the contribution of alternative fuels. For example, 8% for E20 or higher ethanol-blended petrol vehicles, and 22.3% for flex-fuel ethanol vehicles.
EVs also benefit from a separate energy-consumption calculation, with electricity consumption converted into petrol-equivalent consumption using a prescribed conversion factor of 0.1028.
These provisions encourage electrification, hybridisation and the adoption of cleaner fuels.

Flexible Compliance Mechanism:

CAFE-III introduces a credit-debit system to provide manufacturers with greater flexibility.
Manufacturers exceeding their prescribed efficiency targets earn credits, while those falling short accumulate debits.
Credits can be carried forward within compliance blocks and traded between manufacturers.
Manufacturers with outstanding deficits can purchase credits from the Bureau of Energy Efficiency (BEE).
The buyout price starts at ₹2,500 per g CO₂/km in 2027–28 and increases by ₹500 annually, reaching ₹4,500 in 2031–32.
The 3+2-year compliance block structure allows manufacturers to balance deficits across three-year and two-year periods instead of meeting every annual target independently.

Incentives for Technological Innovation:

Manufacturers can claim efficiency improvements from specified technologies, including -
- Start-stop systems and tyre-pressure monitoring.
- Regenerative braking and efficient transmissions.
- Motor-generators and efficient alternators.
- LED lighting and advanced glazing.
- Electric water pumps and improved air-conditioning systems.
Each qualifying technology can provide a claimed reduction of 1 g CO₂/km, subject to an overall cap of 9 g CO₂/km.
Self-declaration is permitted during the first compliance block, while claims in the second block require validated testing.
Manufacturers producing or importing fewer than 1,000 eligible vehicles during a reporting period are exempt from specific CAFE targets but must report their actual fleet-average fuel consumption.

Significance and Way Forward:

CAFE-III seeks to achieve multiple objectives -
- Environmental sustainability: Reduce vehicular emissions and fossil-fuel consumption.
- Energy security: Lower dependence on imported petroleum through improved fuel efficiency and alternative energy sources.
- Technological innovation: Encourage investment in EVs, hybrids, cleaner fuels and energy-efficient vehicle technologies.
- Regulatory certainty: Provide a predictable framework for long-term investment and product development.
- Consumer choice: Allow manufacturers to adopt different technological pathways according to market demand and capabilities.
However, manufacturers must balance compliance costs, technological investments and vehicle affordability, particularly in the price-sensitive small-car segment.

Conclusion:

CAFE-III represents an important step towards decarbonising India's passenger vehicle sector. It seeks to promote cleaner mobility while accommodating the diverse capabilities of automobile manufacturers.
Its success will depend on effective implementation, technological innovation and the affordability of cleaner vehicles.