Fuel & Energy Opinion South Africa

Electric cars are not yet a solution for South Africa

Should South Africans switch to electric cars to reduce their environmental footprint? The answer is no.
Source: Unsplash

Should South Africans switch to electric cars to reduce their environmental footprint? The answer is no.

In the South African context, electric cars are currently the dirtiest means of personal transport available, and will remain so until we have fixed our electricity generation.

Autotrader’s annual industry report in 2021 included a section for electric vehicles (EVs) for the first time, revealing that interest in these vehicles has surged.

The Trade & Industrial Policy Strategies (Tips) group has called for government grants to encourage the purchase of EVs to reduce the environmental footprint of the automotive sector. In isolation this makes no sense, because of the enormous environmental footprint associated with the manufacture of new vehicles, regardless of type.

But might the long-term benefits of EVs outweigh the short-term environmental impacts of their manufacture? This is a particularly piercing question, since EVs, due to the rare earth metals of their batteries and their greater average weight, have a larger manufacturing footprint than equivalent internal combustion engine vehicles.

In order to get a sense of when, or if, an EV will break even on its carbon emissions compared to an internal combustion engine competitor, we need a reasonable comparison in the South African context.

The most convenient available basis of comparison is that of CO2 emissions per unit of energy delivered to the wheels, from the starting point of a ready-to-burn fuel as energy source. This differs a bit from a full ‘well-to-wheels’ comparison because it omits the environmental impacts of extraction, processing, and distribution. This omission is likely to be kinder to EVs than to internal combustion engines; South Africa’s electricity is predominantly produced from coal, 90% of South Africa’s electricity is produced from coal, the mining and processing of which is a remarkably dirty business. Still, it is fair to assume that the impacts of extraction for each energy source are fairly comparable so, for a preliminary broad analysis, fuel-to-wheels is a reasonable basis of comparison.

Careful calculations (see box below) show that even using conservative estimates, an EV charged using South Africa’s current electric grid will have about 18% higher carbon emissions than a conventional petrol vehicle. Generally speaking, the overall energy efficiency of using EVs is higher, if the initial source of energy is the same - the difference here arises because 90% of South Africa’s electricity is produced by outdated, low efficiency coal-fired power stations. There are sources of error and uncertainty on both sides of this calculation, as well as unaccounted-for emissions, but the margin is sufficient for confidence in the overall outcome.

Thus we can conclude that until and unless South Africa has thoroughly reformed electricity generation and distribution, electric cars should not even be remotely considered as environmentally friendly – they are quite literally the dirtiest available means of personal transport.

Public transport is the answer

Phasing out coal and refurbishing our grid may well improve that picture quite substantially, but there is a far larger inefficiency that is omitted from these calculations: a typical car weighs about 1,800kg, while a typical human weighs 70kg. When a person drives alone, scarcely 4% of the energy going to the wheel is actually used for the task of actually moving that car’s occupant around – the rest is devoted to moving the vehicle itself.

Quibbling over percentage points of fuel-to-wheel efficiency seems like a ridiculous exercise when energy wastage at the wheel exceeds the actual useful work by a factor of 25. The core issue of personal transportation is the sheer quantity of energy used, not the source of that energy. From a technological standpoint, this excessive energy use is a solved problem – there are alternative modes of transport that use a fraction of the energy.

If Elon Musk genuinely wanted to solve climate change, he would be selling bicycles, not electric cars. Bicycles, of course, are not for everybody and certainly not for every occasion but trams, buses, trains and motorcycles all operate on a fraction of the energy requirements of a car, regardless of the initial source of that energy.

Many people may be dubious of the capital cost of the infrastructure needed for those modes of transport. This can be remedied by conducting the quick exercise of multiplying the number of cars registered in South Africa (seven million) by the price of a Tesla ($40,000), or recall that even a lightly-trafficked rural road costs R3.5m per kilometre, with freeways costing several multiples of that per lane. Cars are also the most infrastructure-intensive means of transport, and have ancillary costs that are easy to forget. In car-dependent cities, a sizeable fraction of total land use is devoted to roads and parking - as high as 35% to 50% in some cities. If we had fewer cars, we would also have more space.

That is not to say that cars should be wiped from our roads entirely - in some respects they simply aren’t replaceable. But personal transport has always been a mixture of modalities, and an optimised, efficient transport network will entail fewer personal cars, with a greater share going to public transport and low-energy personal transport.

The cars that are part of an optimised network may well be electrically driven, but with an ownership pattern shifted toward car-sharing to increase usage rates per vehicle, reducing manufacturing burden relative to usage as well as reducing the percentage of charge that is wasted.

If and when South Africa’s energy picture improves to the point that EVs have a lower carbon footprint than internal combustion engines, they will still compare badly to other personal transport options, and their widespread adoption will still require a carbon- and resource-intensive transition process. Subsidies should not be allocated on a “second-worst option” basis.

EVs are not a departure from energy-intensive, environmentally damaging personal transport; they continue that status quo. Even if we are destined to transition entirely to renewable energy (as we eventually must), how long it takes us to make that transition, how much it will cost, and what resources must be consumed to achieve it, will all be directly proportional to the amount of energy that we are using.

Subsidies, then, should be directed toward reducing energy use rather than perpetuating exorbitantly energy-intensive activities. Subsidies directed toward EVs would, by extension, subsidise the iron and coal mining that support steel manufacture, while discouraging the use of efficient alternatives.

Those who propose that the government should subsidise them as they drag the better part of two tons of steel, plastic and rare earth metals around with them everywhere they go, are not advocating for the environment, they are advocating for the industries that supply those materials.

Source: GroundUp

GroundUp is a community news organisation that focuses on social justice stories in vulnerable communities. We want our stories to make a difference.

Go to: http://www.groundup.org.za/

About Neil Thomas Stacey

Neil Thomas Stacey is a scientist in Wits University's Chemical Engineering department.

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