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November 10, 2021 05:30 AM

Is your electric car as eco-friendly as you thought?

EVs in some countries pollute more than combustion-engine vehicles, data shows

Reuters
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    REUTERS/Ralph Orlowski

    An EV driver in Germany, which relies on a mix of renewables and coal, makes a 55 percent greenhouse gas saving, the data showed.

    BERLIN -- Electric vehicles are a powerful weapon in the world's battle to beat global warming, yet their impact varies hugely from nation-to-nation and in some places they pollute more than gasoline models, data analysis shows.

    In Europe, where sales are rising the fastest in the world, EVs in Poland and Kosovo actually generate more carbon emissions because grids are so coal-reliant, according to the data compiled by research consultancy Radiant Energy Group (REG).

    Elsewhere around Europe, however, the picture is better, though the relative carbon savings depend on what supplies grids and the time of day vehicles are charged.

    Best performers are nuclear and hydroelectric-powered Switzerland at 100 percent carbon savings vis-a-vis gasoline vehicles, Norway 98 percent, France 96 percent, Sweden 95 percent and Austria 93 percent, according to the study shared with Reuters.

    Laggards are Cyprus at 4 percent, Serbia 15 percent, Estonia 35 percent and the Netherlands 37 percent.

    An EV driver in Europe's biggest car manufacturer Germany, which relies on a mix of renewables and coal, makes a 55 percent greenhouse gas saving, the data also showed.

    In countries like Germany or Spain with big investment in solar and wind, lack of renewable energy storage means the amount of carbon saved by driving an EV depends heavily on the time of day you recharge.

    Charging in the afternoon - when sun and wind are more prevalent - saves 16-18 percent more carbon than at night when grids are more likely to be fueled by gas or coal.

    The analysis, based on public data from Europe's transmission system operator transparency platform ENTSO-E and the European Environment Agency (EEA), came ahead of Wednesday's discussions on transport at the COP26 summit.

    It showed how the auto industry's ability to reduce emissions depends on finding better ways to decarbonize electricity grids and store renewable energy - challenges many European countries have not yet overcome.

    Lithium ion batteries are only able to store energy at full capacity for up to around four hours, meaning even countries sourcing significant amounts of solar and wind power during the day struggle to keep it on tap for nighttime charging.

    Footprint disparities

    Until consistent, low-carbon energy is available across the region, EV drivers keen to reduce their footprint and engineers designing charging infrastructure need to take these disparities into account, the German- and U.S.-based REG researchers said.

    "Electricity has the capability of decarbonizing transportation in a way that internal-combustion engines never will," said researcher Sid Bagga.
    "But the carbon impact of electrification varies dramatically depending on a country's energy mix ... Countries must adopt credible and achievable electricity decarbonization strategies if the EV transition is to be a success."

    The gulf in emissions between electric and gasoline-powered vehicles has fallen in recent years as automakers cognizant that they would need to meet EU carbon reduction targets while still selling majority internal combustion engine cars made their engines more fuel-efficient.

    As a result, the carbon intensity of newly-registered gasoline-powered cars in Europe fell an average of 25 percent between 2006 and 2016, according to EEA data.

    EV sales in Europe are propelled by government subsidies and regulations against new combustion-engine cars from 2035. One in five vehicles sold in Europe last quarter were electrified, and consultancy Ernst & Young expects sales of zero-emissions models to outpace combustion-engine variants in absolute terms by 2028.

    Automakers including General Motors, Stellantis, and Volkswagen Group have set targets to sell mostly or exclusively EVs in Europe in coming years, with GM committed to an electric European lineup by 2022 and VW aiming for 70 percent all-electric sales by 2030.

    REG's study was based on data from Jan. 1 to Oct. 15, 2021. It compared emissions from charging an electric vehicle matching a Tesla Model 3 efficiency to drive 100 km (62 miles) with emissions generated by fueling the average gasoline-powered vehicle the same distance.

    Countries where charging an electric vehicle is over 85 percent cleaner than driving a gasoline-powered car tend to be those with a consistent low-carbon energy supply source, namely hydroelectric or nuclear.

    Even then, there are no hard-and-fast rules on which energy source at what time leads to lowest carbon supply across the EU: for example, in Sweden wind blows more at night.

    Charging an EV in Ireland, which sources 46 percent of its energy from renewables, saves roughly the same proportion of carbon as in Moldova, which sources 94 percent of energy from gas, the study found, because Ireland's backup fossil fuels are more carbon-intensive.

    "Ireland produces a higher amount of zero-carbon electricity than Moldova - but it also gets about 13 percent of its electricity from oil (which is 1.8 times dirtier than gas), 9 percent from coal (2.3 times dirtier than gas), and 3 percent from peat (2.6 times dirtier than gas)," Bagga said.

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