India will make carmakers meet stricter fuel-efficiency targets from April 2027, as the country tries to contain fuel consumption from a growing passenger-vehicle market. The new Corporate Average Fuel Economy (CAFE) norms will apply from April 1, 2027, to March 31, 2032. The fleet-average fuel-consumption target will fall from 3.996 litres per 100 km in 2027–28 to 3.3273 litres per 100 km in 2031–32.

That is a 16.7% improvement in the regulatory benchmark over the five-year period. The change matters because India’s demand for road fuel is rising while the country continues to import more than 90% of the crude oil it uses. Cars that consume less fuel can reduce the amount of petrol and diesel needed to keep the growing vehicle fleet on the road.
The new rules also give manufacturers more room to use electric vehicles, hybrids, alternative fuels and other efficiency technologies to meet their targets.

CAFE Norms: Why India Needs to Use Less Fuel

India’s passenger-vehicle market has changed considerably over the past decade. SUVs and larger cars have become more common, while overall vehicle ownership continues to rise. Every additional petrol or diesel vehicle adds to fuel demand. A more fuel-efficient fleet can slow that increase, even when the number of vehicles continues to grow.

The country’s dependence on imported crude makes this particularly relevant. India imports more than 90% of its crude oil, so higher oil consumption also means greater exposure to international oil prices and supply disruptions. The Bureau of Energy Efficiency introduced CAFE standards in 2017 with three objectives: reduce fuel consumption, lower carbon dioxide emissions and reduce dependence on imported oil. The latest notification tightens those requirements for the next five years.

CAFE: Not Same Mileage Target for Every Car

CAFE works differently from a rule that says every vehicle must deliver a particular number of kilometres per litre. It measures the average fuel consumption of a manufacturer’s passenger-vehicle fleet. The calculation takes sales volumes and vehicle weight into account. A company selling fuel-hungry SUVs, for instance, can improve its fleet average by selling more efficient cars, hybrids or electric vehicles.

That gives manufacturers several ways to meet the requirement. They can improve engines and transmissions, reduce energy losses, introduce hybrid systems, sell more EVs or use technologies that receive concessions under the CAFE framework.

What does the 16.7% Improvement Mean?

The 16.7% figure refers to the regulatory fleet benchmark. It does not mean that every new car will use 16.7% less petrol or diesel. Actual fuel consumption depends on the vehicle and how it is driven. Traffic, road conditions, speed, air-conditioning use and driving behaviour all affect mileage. The target applies to the manufacturer’s fleet as a whole.

The new framework also changes the vehicle-weight calculation. The reference weight will rise from 1,082 kg to 1,229 kg. The target curve has been revised so that heavier vehicles face greater efficiency requirements than lighter ones. That change is relevant to India’s passenger-vehicle market, where larger SUVs now account for a substantial share of sales.

Why EVs can Help Manufacturers Meet CAFE Targets

Electric vehicles have a direct advantage under a fuel-economy regulation because they do not consume petrol or diesel.

A manufacturer can therefore improve its fleet-average performance by increasing the share of EVs it sells. Hybrids can also reduce the average fuel consumption of a fleet.

The International Council on Clean Transportation (ICCT) has examined this relationship in its latest study of India’s vehicle market. Its 2026 analysis finds that stronger fuel-economy standards can support faster EV adoption and reduce oil consumption when the two policies move together. There is some evidence from India’s earlier CAFE rules as well.

An ICCT assessment of CAFE Phase II found that manufacturers relying on conventional efficiency improvements or CNG had difficulty meeting the targets. Manufacturers with significant EV sales, including Tata and MG, were able to meet the requirements with larger margins. The experience shows how a fleet standard can influence the technology choices made by manufacturers.

Stronger Standards Could Reduce Oil Demand

ICCT’s latest study models India’s road-transport oil demand under several policy pathways through 2040. In its business-as-usual scenario, road-transport oil consumption reaches about 197 million tonnes of oil equivalent (Mtoe) in 2040. An alternative scenario combines stronger fuel-efficiency standards with faster EV adoption. Under that pathway, oil consumption is about 146 Mtoe in 2040.

The difference is roughly 51 Mtoe. These are modelled scenarios, not forecasts. They show the scale of the difference that could emerge if India combines tighter efficiency rules with faster electrification. For India, lower oil demand would also reduce the amount of crude that has to be imported to supply road transport.

Technologies Beyond EVs

Electric vehicles are only one part of the new framework. The norms recognise 12 fuel-conservation technologies, compared with four under the earlier framework. These include technologies such as high-efficiency air-conditioning systems, advanced glazing and solar-reflective paints.

Each eligible technology can receive a concession of 1 gram of CO₂ per kilometre, subject to a maximum of 9 grams of CO₂ per kilometre. The framework also includes a Carbon Neutrality Factor for ethanol-blended petrol, biofuels and compressed biogas. This allows manufacturers to use a wider combination of technologies and fuels when working towards their fleet targets.

Super Credits Could Shape How Manufacturers Respond

The rules provide additional regulatory benefits for battery-electric vehicles, range-extended EVs, plug-in hybrids, strong hybrids and flex-fuel vehicles through volume derogation factors and super credits. These mechanisms give low-emission vehicles greater weight in the compliance calculation.

There is a trade-off, however. ICCT’s latest analysis points out that generous super credits can allow manufacturers to meet fleet targets with a relatively small share of EVs while continuing to sell less-efficient combustion-engine vehicles. That makes the treatment of these credits important as EV sales increase.

What Manufacturer Misses the Target?

The rules give companies several ways to manage compliance. Manufacturers can operate within two- or three-year compliance blocks. Credits can be carried forward, traded or exchanged. The Bureau of Energy Efficiency will also operate a buyout mechanism.

The system therefore gives manufacturers some flexibility in how they meet the target. It also means the effect of the regulation may not be visible in a single year’s sales figures.

Will Consumers Notice the Change?

Some changes could be visible in the showroom. Manufacturers may introduce more efficient petrol engines, expand hybrid offerings or increase the number of EVs in their portfolios. Other changes, such as improvements to air-conditioning systems or vehicle design, may be harder for buyers to notice.

The immediate effect on fuel bills is less straightforward. A regulatory improvement of 16.7% cannot be translated directly into a 16.7% saving for a driver. CAFE is calculated across a manufacturer’s fleet, while real-world mileage varies from one vehicle and driver to another. Its effect is likely to appear gradually as new vehicles replace older ones.

CAFE: One Part Larger Transport Shift

Tighter fuel-efficiency standards can reduce the amount of fuel consumed by each vehicle. They do not determine how many vehicles people buy or how much they drive. Public transport, urban planning, vehicle electrification and the availability of alternative fuels will also influence India’s future oil demand.

For the automobile industry, however, the direction is clear. The average efficiency of the vehicles sold in India will have to improve over the next five years. The new CAFE norms give manufacturers several routes to get there. They can make combustion engines more efficient, sell more hybrids and EVs, use recognised fuel-saving technologies or combine these approaches. For India, the reason for tightening the rules is straightforward. More vehicles on the road do not have to mean a matching increase in fuel consumption. The next five years will show how much the industry can narrow that gap.

A wind turbine does not always face the wind squarely. Wind direction changes, turbulence moves through a wind farm and neighbouring turbines disturb the air. Even when a turbine is constantly adjusting its position, there can be an angle between the rotor and the incoming wind. That angle changes how much power the turbine can produce.

Researchers from MIT, Queen’s University, Princeton University and Penn State University have now measured that effect under controlled laboratory conditions. Their experiments found that the blade-tip speed that produces maximum power changes when a turbine is misaligned with the wind. The finding could lead to different control strategies for turbines already operating in wind farms. But the experiment did not test those strategies on a commercial wind farm or demonstrate additional revenue in the field.

The research, published in PNAS Nexus, addresses a problem that has become more important as wind power has expanded. Global installed wind capacity reached 1,299 GW in 2025, after a record 165 GW of new capacity was added during the year, according to the Global Wind Energy Council. The challenge now is partly about getting more useful electricity from that enormous fleet.

Wind Tunnel Behaves More Like the Atmosphere

Wind-farm experiments are difficult to control. Researchers cannot choose the wind speed or direction, and conditions can change before they have isolated the effect they are trying to measure. A conventional wind tunnel creates another problem: a small turbine operating in normal-pressure air does not reproduce all the flow conditions around a much larger turbine.

The researchers addressed this by pressurising the air. They tested a 15-centimetre-diameter turbine at pressures of up to 240 atmospheres. The increased pressure raised air density by roughly 100 to 220 times, allowing the small turbine to reproduce important aspects of the aerodynamics of much larger machines.

The researchers say the setup represented turbines roughly 15 to 20 metres in diameter, with the potential to represent machines up to 35 metres. Over several weeks, the team tested the turbine at different wind-alignment angles and under different control settings. That allowed them to separate two variables that are usually tangled together in a real wind farm: how far the turbine is turned away from the wind and how fast its blades are rotating relative to the wind.

The Outcome of the Experiment

The central finding was not simply that a misaligned turbine can produce more electricity. The experiments showed that the tip-speed ratio for maximum power depends on the turbine’s yaw angle, or how far its rotor is turned away from the incoming wind. That means a turbine operating at an angle to the wind should not necessarily use the same blade-speed setting as a turbine facing the wind directly.

The researchers changed the tip speed while varying the misalignment angle and observed new points of maximum power. They also examined blade pitch and turbine alignment. This matters because many existing approaches to predicting turbine performance assume ideal alignment. The experiments provide physical measurements showing how that assumption breaks down as the angle to the wind increases.

The study also tested a Unified Wind Turbine model developed by MIT researcher Michael Howland. The model predicted how forces and power would change under different combinations of wind misalignment and tip speed. Its predictions agreed with the controlled experimental measurements, providing experimental validation for the model.

The model is computationally lightweight enough to run on a regular laptop, according to the researchers.

What has not been Demonstrated Yet

The researchers estimate that optimising turbine alignment, blade pitch and tip speed could potentially generate tens of thousands of dollars in additional revenue per turbine each year.
It is a modelled economic estimate, not money earned by a turbine during the experiment. The researchers tested a 15-centimetre turbine in a pressurised laboratory; they did not operate a commercial wind farm under the proposed control strategy and measure its annual revenue.

The laboratory experiment therefore establishes the underlying aerodynamic relationship. Whether that relationship can be turned into a sustained increase in electricity generation under real weather conditions remains a field question. Wind farms are much harder environments to control.

In an earlier field experiment, Howland’s team deliberately misaligned turbines for months to study their behaviour. The approach generated useful data, but the researchers had to contend with changing weather and turbulent atmospheric conditions. The pressurised tunnel offers a way to test many combinations of conditions before taking an idea into that environment.

“The big output of the experiments was clearly showing that new power maximums can be achieved when the turbine becomes misaligned with the wind through only changes to the tip speed,” John Kurelek, lead author and assistant professor at Queen’s University, said.

Wind Energy and Its Indian Context

India’s wind fleet provides a substantial real-world setting in which such questions could eventually be tested. The country had 58.52 GW of installed wind power capacity as of August 31, this year, according to the Ministry of New and Renewable Energy. It added 2.43 GW during the first five months of the 2026–27 financial year, taking cumulative capacity above 58 GW.

India has also been one of the major markets driving global wind expansion. GWEC identifies China, the United States and India among the leading countries for new wind capacity additions. That makes turbine performance more than a question of designing the next generation of machines. There is already a large installed fleet whose output depends on how effectively turbines respond to changing wind conditions.

But the MIT findings cannot yet be directly translated into an Indian power-generation figure. India’s turbines operate across different wind regimes, terrain and farm layouts, while the experiment was designed to isolate aerodynamic effects in controlled conditions.

The next step is therefore straightforward: test whether the relationship measured in the laboratory holds when turbines have to deal with the shifting, turbulent conditions of an actual wind farm. If it does, the gain would come from changing how turbines operate rather than rebuilding them. For now, the experiment has established the physics behind that possibility. The commercial benefit remains to be tested.

India’s cities generate about 1.62 lakh tonnes of municipal solid waste every day. Of this, around 1.32 lakh tonnes is processed, according to data reported by States and Union Territories on the Swachhatam portal in January 2026. That leaves more than 30,000 tonnes a day outside the reported processing stream.

The scale of the waste stream makes what happens to its biodegradable fraction important. Food scraps, vegetable and fruit waste, cattle dung and other organic material can either add to the disposal burden or be recovered for another use.

India’s new Solid Waste Management Rules, 2026, which came into force on April 1, make this distinction more explicit. They require waste to be separated at source into four streams, including wet waste. Kitchen waste, vegetables, fruit peels, meat and flowers are to be composted or processed through bio-methanation at the nearest facility.

Across India, projects are already using different organic waste streams to produce biogas, electricity, compressed biogas and manure. Their settings range from an educational campus and a vegetable market to a large cattle shelter and a city-scale Bio-CNG plant.

Campus that Replaced LPG with Biogas

At the Shrimati Manekba Vinay Vihar Educational Complex near Adalaj in Gujarat, the kitchen serves more than 500 people every day. Around 250 hostel students receive two meals a day, along with 15 staff families living on the campus.

The campus operates two biogas plants with a combined capacity of 90 cubic metres a day. They use dung from 222 cows kept at the institution’s cowshed, along with kitchen waste and agricultural residue from nearby fields.

The gas meets the campus’s entire cooking-fuel requirement. Without the plants, the campus would have needed around 30 LPG cylinders every month. The process also leaves behind slurry that can be used as organic fertiliser. The arrangement is relatively contained. The waste is generated within or close to the institution, and the resulting gas has a direct use on the same campus.

Vegetable Market Generating Its Own Power

At Bowenpally Vegetable Market in Hyderabad, roughly 10 tonnes of vegetable and fruit waste are collected every day. The waste was previously sent to landfills. An on-site biogas plant now processes nearly all of it. The plant generates around 400–500 units of electricity and 30 kg of biofuel every day. The electricity powers the market’s streetlights, stalls, administration building and water-supply network. The biofuel is used in the commercial kitchen.

The plant has reduced the market’s electricity bill by roughly half, from an earlier average of about ₹3 lakh a month. Five more plants have since been funded at other market yards. The project has also created work for women involved in waste sorting, machinery operation and administration. Here too, the waste source and the main users of the energy are concentrated in one location.

Prayagraj: Multiple Waste Streams Together

The Bio-CNG plant in Prayagraj operates at a much larger scale. It can process 343 tonnes of organic waste a day and produce around 21 tonnes of Bio-CNG. Its feedstock includes wet waste, paddy straw, cattle dung and poultry litter. The plant receives waste from hotels, restaurants and apartment complexes. Daily wet-waste supply has grown from around 7–8 tonnes initially to about 125 tonnes.

Along with Bio-CNG, the facility produces around 28 tonnes of compost each day, which is made available to local farmers. The gas supports city transport. The project is expected to extend piped gas access to around 45,000 households and reduce carbon emissions by approximately 57,000 tonnes annually.

This is a different operating model from the smaller projects. Waste has to be brought in from multiple sources and supplied in sufficient quantities to keep a large facility running.

Gwalior Turns Cattle Dung Into Fuel

At Adarsh Gaushala in Laltipara, Gwalior, more than 10,000 cattle provide the main feedstock for a 100-tonne-per-day CBG plant. The ₹31-crore facility converts about 100 tonnes of cattle dung every day into two tonnes of compressed biogas. It also produces 10–15 tonnes of dry bio-manure daily.

The plant can process vegetable and fruit waste collected from markets and homes as well. The model is built around a large and concentrated source of organic material, with the resulting fuel and manure providing outlets for the products.

Waste Management: The Scale-up Problem Starts with the Waste

These projects demonstrate different ways of using organic waste. They also have conditions that are not automatically available across a city. The Gujarat campus has its own cowshed and kitchen. Bowenpally has a large quantity of similar waste concentrated in one market. Gwalior has access to thousands of cattle. Prayagraj draws from organised sources such as hotels, restaurants and apartment complexes.

Household waste presents a different problem. It is spread across thousands of locations and can contain plastics, glass and other contaminants. Recovering the organic fraction requires consistent segregation and collection. Moving it to a processing facility adds transport costs.

The plant itself is only one part of the system. A facility also needs a dependable supply of suitable feedstock. Once gas or electricity is produced, there must be a user or buyer. Compost and bio-manure need markets as well.

The 2026 rules place greater emphasis on this chain. Four-stream segregation is now mandatory, and bulk waste generators producing 100 kg or more of waste a day are required to ensure that their waste is collected, transported and processed properly. They must process wet waste on-site as far as possible or obtain an Extended Bulk Waste Generator Responsibility certificate where that is not feasible.

What the Projects Tell Us About Waste-to-energy

The four projects provide evidence of what can work when the waste stream, technology and end use are aligned. They do not establish that the same economics will apply across India’s urban areas.

The Bowenpally example, for instance, shows a substantial reduction in the market’s electricity bill, but the available account does not provide enough information on capital expenditure, operating costs or the time required to recover the investment. The same questions become more important as systems grow larger.

There is also a distinction between expected and demonstrated environmental benefits. The approximately 57,000-tonne annual carbon reduction cited for Prayagraj is an expected outcome, not a measured result reported in the source material. And the climate value of these systems cannot be judged only by what comes out of the plant. Collection, transport, processing and the energy source being replaced all form part of the calculation.

India’s waste figures show why the issue matters. More than 1.6 lakh tonnes of municipal waste enters the urban system every day, even as the country reports processing around 81% of it. The opportunity for organic waste lies in what happens before disposal becomes necessary. The challenge is making segregation, collection, processing and end-use work reliably enough for waste-to-energy to become part of that larger system.