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Should You Buy an Electric Car?

Electric motors are inherently more efficient than internal combustion engines. And, provided the electricity used has a carbon intensity below about 800 grams per kilowatt-hour, electric cars reduce carbon emissions.

NEW DELHI – Passenger cars account for only 8% of total global carbon dioxide emissions, and if you charge an electric vehicle (EV) with electricity generated by inefficient coal power plants, the immediate effect will be increased CO2 emissions compared with driving a modern gasoline or diesel car. So it’s important to stress, as Fatih Birol, Executive Director of the International Energy Agency, did at Davos in January, that electric cars alone will not avert catastrophic climate change. But vehicle electrification is nonetheless crucial to reducing emissions. If you care about the climate, the next car you buy should be electric.

Electric motors are inherently more efficient than internal combustion engines: while a gasoline or diesel engine typically wastes more than 70% of the energy it uses as unwanted heat, an electric motor turns all but 5% into kinetic energy. And once battery costs fall below $100 per kilowatt-hour – which Bloomberg New Energy Finance (BNEF) expects to occur by 2024 – electric cars will not only be cheaper to run, but also cheaper to buy. So EVs will eventually dominate – and far sooner than many projections suggest – whether we care about the climate or not.

Provided the electricity used has a carbon intensity below about 800 grams per kWh, electric cars reduce carbon emissions. In France (with average intensity of about 80 grams), the United Kingdom (about 250 grams and falling fast), the United States (about 400 grams) and even high-carbon Germany (still around 500 grams), electric cars will undoubtedly reduce emissions, provided users avoid charging them at times when marginal intensity is highest.

In China and India, by contrast, with average electricity carbon intensity around the break-even point of 800 grams, very rapid EV growth could have an adverse effect initially. But what matters is the carbon intensity of electricity used throughout the vehicle’s life. The optimal strategy is therefore to encourage auto electrification while also rapidly decarbonizing power generation, which the collapsing cost of renewables now makes possible. As recent reports from the Energy Transitions Commission show, India could reduce its electricity carbon intensity to 550 grams per kWh by 2030, while doubling electricity consumption – and at no cost to consumers.

Moreover, the potential for transport electrification to reduce CO2 emissions is far greater than the 8% figure suggests. An additional 8% of emissions come from trucks and buses, and the future is electric for these vehicles, too. Here, the pace of electrification will partly reflect how many people choose to buy electric cars. Massive investments in battery innovation and manufacturing scale, driven by expected EV purchases, are delivering cost reductions and energy-density increases which make battery-powered electric buses and short-haul trucks increasingly competitive. For long-distance trucking, hydrogen fuel cells may be key to adequate range, but the engines will be electric, delivering dramatic improvements in urban air quality and reducing CO2 emissions (if electricity comes from lower-carbon sources). Battery or hydrogen electric technologies will also play a significant role in shorter-distance shipping and aviation.

At the same time, battery innovations initially driven by EV growth will reduce the cost of power decarbonization. BNEF estimates that battery prices could fall to $62 per kWh by 2030, enabling the utility sector to deploy total battery systems at less than $150 per kWh, with batteries providing cost-efficient overnight storage in electricity systems that increasingly depend on solar and wind sources. That, in turn, will deliver the lower carbon intensity required to make EVs good for the planet.

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Other technologies, apart from electricity, batteries, and hydrogen fuel cells, are of course vital to reduce emissions. In the harder-to-abate industrial sectors such as steel, cement, and chemicals, bioenergy sources and carbon capture will also be required. In aviation, batteries will be far too heavy to power intercontinental flight unless dramatic and currently unforeseeable improvements in battery energy density – six times or more – can be achieved. Synthetic jet fuel produced from low-carbon electricity may become economic, and biofuels are also likely to play a significant role.

But while a combination of technologies will be needed, all feasible scenarios for achieving the objectives of the Paris climate agreement show that a massive increase in the role of electricity is essential. The recently published Shell “Sky Scenario” estimates that electricity will account for more than 60% of final energy demand by late this century, up from around 20% today. If we don’t electrify as much of the economy as possible, and decarbonize electricity production as rapidly as possible, we have no hope of avoiding severely harmful climate change.

Of course, EVs come in different types and sizes, and the bigger the electric car you buy, and the more you show off its superior acceleration, the greater the danger that the immediate impact of going electric will be an increase in emissions. Unfortunately, current EV offerings are skewed toward larger cars and SUVs, with fewer small and mid-size models, which will eventually deliver the biggest emissions reductions. This reflects the car companies’ profit incentives, the difficulties of achieving adequate range with smaller batteries, and the lack of sufficiently widespread charging infrastructure. But the charging infrastructure can and must be built, and a wider range of auto sizes will increasingly be available.

So, if you care about the climate, your next car should be electric, preferably a size or two smaller than the one you first thought about. And to ensure that you really are helping to save the planet, you should combine your personal purchase decision with political support for policies to drive rapid electricity decarbonization and investment in widespread charging infrastructure. Buying EVs alone cannot save the planet, but doing so is a powerful lever for the broader changes that can.

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