Renewable Fuel or Electric Vehicles? Which is Better for the Environment?
Posted on 28th February 2020
When it comes to powering vehicles in a low CO2 manner, the only options available are electric vehicles and renewable fuel alternatives, such as HVO, biodiesel, bioethanol and hydrogen fuel cells, so it’s worth taking a look at which is the best in the long run.
Petroleum alternatives are rising in popularity
Electric vehicles are seeing unprecedented popularity, and deservedly so. According to the Society of Motor Manufacturers and Traders (SMMT), electric vehicles and alternatively fuelled vehicles made up 13% of cars registered in the UK. This is almost a double increase compared to 7% the year before, showing that Britons are becoming increasingly aware of their carbon footprint and eager to make a positive change.
While battery electric vehicles (BEV), plug-in hybrid vehicles (PHEV), hybrid electric vehicles (HEV) and mild hybrid electric vehicles off lower emissions, it’s important to note that fossil fuels will no doubt be used to power
With lower CO2 emissions offered by battery electric vehicles (BEV), plug-in hybrid electric vehicles (PHEV), hybrid electric vehicles (HEV) and mild hybrid electric vehicles (MHEV) respectively, the UK’s air quality can breathe a sigh of relief, despite the SMMT says average new car CO2 emissions rose in 2018, up 2.9% to 124.5g/km due to consumer demand turning from diesel cars toward petrol-powered cars and petrol-powered hybrids.
However, it’s important to also note that fossil fuels will no doubt be used to lay the cables and build the charging points. So are electric vehicles really a cleaner route than renewable biofuels?
Petroleum alternatives are now more popular than ever – here at Crown Oil, in just the last year we’ve seen a three-fold increase in interest in diesel alternatives, including biodiesel and renewable diesel (HVO fuel), something that’s certainly been observed by the wider industry.
A new report by the Institute of Mechanical Engineers (IMechE), Accelerating Road Transport: Decarbonisation looked at how battery-powered electric vehicles (BEVs) compared with five other fuel sources, including petrol and diesel using well-to-wheel, well-to-tank and tank-to-wheel life cycle analysis (LCA) models. This is also known as a cradle-to-grave analysis of the fuel.
Well-to-wheels CO2 analysis – battery power versus renewable fuels
Well-to-wheels analysis is important when comparing CO2 emissions of different fuel types as it takes into account the emissions from the whole lifecycle of the fuel and vehicle using it. This includes the production of the vehicle (which is higher for BEVs due to the production of their larger batteries) and involves two parts the well-to-tank number and the tank-to-wheel number.
The well-to-tank figure is the quantity of greenhouse gases released from taking the fuel out of the ground to putting it in a vehicle’s tank.
The final part of the LCA is the tank-to-wheel number, which considers the CO2 in the subsequent use of the fuel through combustion in the engine to make the vehicle’s wheels move.
According to IMechE, vehicles powered by 100% renewable diesel have lower well-to-wheel CO2 emissions than that for electric vehicles.
According to their research, production of fully battery-powered vehicles contributes around 57 grammes per square kilometre (g/km2) of CO2 when charged with only green electricity. However, when charged with electricity obtained from a mix of electricity sources in the EU, that rises to 117 g/km2 of CO2. Compared with CO2 emissions for internal combustion engine vehicles, it’s much better than the 140g/km2 for conventional diesel and 171g/km2 for conventional petrol.
Meanwhile, IMechE estimates the carbon cost associated with well to wheel lifecycle of 100 percent renewable fuels is far lower: around 45g/km2 for renewable petrol and 46g/km2 for renewable diesel.
Tank-to-wheel emissions – battery power versus renewable fuel
In terms of tank-to-wheel emissions, battery-powered EVs emit zero greenhouse gases when running. Their carbon footprint comes from the charging of the battery.
But when you switch to 100% renewable fuels, you can also disregard tank-to-wheel as the CO2 released in combustion is reclaimed by the feedstock that provided it as the raw material of the fuel.
As a result, 100% renewable petrol (such as bioethanol) cars have CO2 emissions of 45 g/km2, while 100% renewable diesel has CO2 emissions of 46 g/km2, significantly lower than what BEV can currently attain.
The data also discussed how emissions could look in ten years’ time, allowing for improvements in CO2 emissions that we expect to see in time, and even in the long-term, IMechE expects renewable fuels to offer lower lifecycle emissions than battery EVs.
|Fuel type||Current total CO2 emissions (g/km2)||Estimated total CO2 emissions, 2030 (g/km2)|
|100% Renewable diesel||46||46|
|BEV (green energy)||58||58|
Data: Institute of Mechanical Engineers
Does that mean don’t buy battery-electric vehicles?
Nonsense – battery-electric cars are still far cleaner than their petrol and diesel counterparts and are easy for consumers to buy! As such, they play a very big role in improving local air quality by eliminating emissions such as particulate matter and NOx.
Unfortunately, 100 percent renewable fuel blends are not available at fuel stations in the UK, so they are only an option if you order your fleet’s fuel in bulk. If you use a fuel supplier for on-site delivery, then you can start thinking about the fuel that has the best long-term environmental impact.
Furthermore, when it comes to heavy vehicles, like trucks, electric power is currently not a viable option due to the large distances they travel and the heavy loads they need to carry. In this case, the easiest option is to ensure they use clean, renewable fuels as an alternative to petroleum-based diesel.
All the research points out is the easiest route is to help make biofuels easier to access and to improve the engines that run on these fuels, including the production of these engines.
Best uses of HVO renewable diesel
As well as its credentials as a renewable diesel alternative, HVO is a ready-made solution for heavy-duty fleets to reduce their greenhouse emissions, enabling users to cut their NET CO2 emissions by 90% immediately as well as making major noxious emission reductions. EV technology is still being developed for high-load and long-range vehicles, hampering its application in haulage, construction, civil engineering and agricultural applications.
In this light, HVO renewable diesel very much has a place in a world where there is a need to reduce our dependence on fossil fuel.
Interested in the most environmentally-friendly fuel that can power your vehicle? Enquire about HVO fuel by calling 0330 123 1444 today.