A groundbreaking June 2025 study by the Indian Institute of Technology (IIT) Roorkee and the International Council on Clean Transportation (ICCT) reveals that Battery Electric Vehicles (BEVs) in India emit up to 38% less carbon dioxide equivalent (CO₂e) per kilometer compared to Internal Combustion Engine (ICE) vehicles in the passenger car segment. By analyzing six life-cycle greenhouse gas (GHG) assessments, the study underscores BEVs’ potential to drive India’s decarbonization goals, aligning with the Paris Agreement and India’s net-zero target by 2070.
- IIT Roorkee and ICCT study shows BEVs emit up to 38% less CO₂e per km than ICE vehicles.
- Synthesizes six life-cycle GHG assessments, highlighting grid carbon intensity, test assumptions, and real-world conditions.
- Urges immediate BEV adoption to curb long-term emissions.
Why BEVs Outshine ICE and HEVs
Key Points:
- BEVs outperform ICE and HEVs in life-cycle GHG emissions.
- Grid carbon intensity, test assumptions, and real-world conditions drive 75% of emission variability.
- Delaying BEV adoption risks locking in ICE emissions for 10-15 years.
The study identifies three key factors behind emission differences, accounting for 75% of variability:
- Grid Carbon Intensity: India’s coal-heavy grid (56% fossil fuels in 2023) impacts BEV emissions, but cleaner grids amplify savings.
- Laboratory Test Assumptions: Unrealistic test-cycle data inflates HEV efficiency.
- Real-World Driving Conditions: Actual energy use, including charging losses, affects BEV performance.
BEVs shine with higher energy efficiency, slashing emissions by 19-34% compared to ICE vehicles, even with India’s current grid. The study warns against waiting for a greener grid, as ICE vehicles bought today will pollute for 10-15 years, contributing up to 368 g CO₂e/km more than BEVs.
Real-World vs. Lab: Closing the Emissions Gap
Key Points:
- Lab tests overestimate HEV efficiency, underreport emissions.
- BEVs show superior real-world energy efficiency.
- Real-world correction factors critical for accurate emissions accounting.
The study highlights a discrepancy between lab tests and real-world performance, especially for Hybrid Electric Vehicles (HEVs). Lab tests often ignore charging losses in BEVs and real-world fuel use in HEVs, skewing results. Applying real-world correction factors reveals BEVs as the most energy-efficient option, with lower lifecycle emissions. For example, diesel emissions vary from 8-22 g CO₂e/km depending on assessment methods. The study stresses stringent fuel efficiency standards and on-board consumption meters to ensure transparency. X posts call for “real-world data to drive policy.”
The Hidden Impact of Biofuels and Land-Use Change
Key Points:
- Biofuel assessments often ignore land-use change emissions.
- Diesel production emissions underestimated without land-use data.
- Future studies must include land-use impacts for accuracy.
Many assessments underestimate biofuel emissions by excluding land-use change, such as deforestation for crops. This oversight can misrepresent biofuels’ environmental impact, with diesel emissions varying by up to 14 g CO₂e/km when land-use is factored in. The study urges comprehensive life-cycle assessments (LCAs) that account for these impacts to guide clean transport policies. Researchers like Sunitha Anup from ICCT emphasize, “What we assume today shapes the climate impact tomorrow.”
Policy Recommendations for a Cleaner Future
Key Points:
- Accelerate BEV adoption with incentives and infrastructure.
- Enforce stringent fuel efficiency standards and real-world meters.
- Integrate land-use emissions in biofuel assessments.
The study offers actionable policy recommendations to maximize BEV benefits:
- Prioritize BEV Adoption: Subsidies like FAME-III and 18,000 public chargers by 2025 in Delhi can boost uptake.
- Decarbonize the Grid: India’s 500 GW renewable energy target by 2030 will amplify BEV savings.
- Strengthen Standards: Mandate on-board fuel/energy meters for accurate emissions data.
- Include Land-Use Impacts: Future LCAs must account for biofuel-related land-use changes.
Namita Singh, ICCT co-author, notes, “India’s net-zero path is incomplete without accelerated BEV adoption.
Challenges and Criticisms
Key Points:
- India’s coal-heavy grid limits BEV emission reductions.
- Regulatory gaps, like no ZEV sales mandate, slow progress.
- High upfront EV costs deter adoption despite TCO parity.
Despite BEVs’ promise, challenges persist:
- Coal-Dependent Grid: With 56% fossil fuel-based power, BEV emissions savings are lower than in greener grids.
- Policy Gaps: No binding zero-emission vehicle (ZEV) mandate or ICE phase-out roadmap hampers progress.
- Cost Barriers: High upfront costs, despite FAME subsidies reducing EV scooters to twice the price of ICE models, deter buyers.
The Bigger Picture: India’s Road to Net-Zero
Key Points:
- BEVs align with SDG 13 (Climate Action) and NEP 2020’s innovation focus.
- EVs could avoid 110-380 Mt CO₂ by 2050 with grid decarbonization.
- Supports India’s 30% EV sales target by 2030.
The study aligns with India’s net-zero by 2070 goal and NEP 2020’s push for sustainable innovation. BEVs could cut 12% of transport-related CO₂ (291 Mt in 2023) by 2050, saving 110-380 Mt CO₂ with a cleaner grid. India’s 30% EV sales target by 2030 relies on scaling BEVs, with two-wheelers (4% EV share in 2022) leading the charge.
