As the United Kingdom accelerates toward net-zero targets and cleaner transport solutions, renewable fuels like HVO and FAME biodiesel are gaining serious attention. While both are marketed as “green diesel alternatives,” they are fundamentally different in composition, performance, and long-term impact.
If you’re a fleet manager, business owner, or simply an eco-conscious driver in the UK, understanding the difference between HVO and FAME biodiesel is essential before making the switch.
What is HVO Biodiesel?
Hydrotreated Vegetable Oil (HVO) is a next-generation renewable diesel produced through a hydrotreatment process. This involves treating vegetable oils, waste fats, or residues with hydrogen under high pressure and temperature.
Key Characteristics of HVO:
- Chemically similar to fossil diesel
- Free from oxygen, sulphur, and aromatics
- Can be used as a drop-in fuel (no engine modification needed)
- Extremely stable with long shelf life
HVO is often referred to as renewable diesel, and in the UK, it’s becoming popular in industries like construction, logistics, and public transport.
What is FAME Biodiesel?
Fatty Acid Methyl Ester (FAME) biodiesel is the more traditional form of biodiesel, produced via a process called transesterification. It uses vegetable oils or animal fats reacted with methanol.
Key Characteristics of FAME:
- Contains oxygen molecules
- Typically blended with fossil diesel (e.g., B7 in the UK)
- Biodegradable but less stable
- More prone to oxidation and microbial growth
In the UK, standard diesel sold at pumps often contains up to 7% FAME biodiesel (B7 blend).
Difference Between HVO and FAME Biodiesel
Understanding the difference between HVO and FAME biodiesel comes down to several critical factors:
1. Production Process
- HVO: Hydrogen treatment under high pressure
- FAME: Chemical reaction using methanol (transesterification)
HVO undergoes a more advanced refining process, making it cleaner and more consistent.
2. Chemical Structure
- HVO: Paraffinic hydrocarbon (similar to fossil diesel)
- FAME: Contains oxygen molecules
This difference affects combustion efficiency and storage stability.
3. Engine Compatibility
- HVO: Fully compatible with existing diesel engines
- FAME: Usually blended; high concentrations may require modifications
HVO is a true drop-in fuel, making it easier for UK fleets to adopt.
4. Performance in Cold Weather
- HVO: Excellent cold flow properties (ideal for UK winters)
- FAME: Can gel or clog filters in low temperatures
HVO performs significantly better in colder climates.
5. Storage Stability
- HVO: Long shelf life, resistant to degradation
- FAME: Prone to oxidation and microbial contamination
Businesses storing fuel for long periods benefit more from HVO.
6. Emissions and Environmental Impact
- HVO:
- Up to 90% reduction in greenhouse gas emissions
- Lower NOx and particulate emissions
- FAME:
- Moderate CO₂ reduction
- Higher NOx emissions compared to HVO
HVO offers a cleaner burn and better air quality benefits.
7. Cost in the UK Market
- HVO: Generally more expensive due to advanced processing
- FAME: More affordable and widely available
Cost is often the deciding factor for many UK businesses.
HVO vs FAME Biodiesel: Which is Better for the UK?
The answer depends on your priorities:
- Choose HVO if you want:
- Premium performance
- Lower emissions
- Hassle-free transition
- Choose FAME if you want:
- Lower upfront fuel costs
- Easy availability at standard fuel stations
For sectors like construction, rail, and logistics in the UK, HVO is increasingly becoming the preferred choice due to stricter environmental regulations.
Why the UK is Moving Toward HVO
The UK government’s push toward decarbonisation and stricter emission standards is encouraging businesses to adopt cleaner fuels.
HVO supports:
- Net Zero goals
- Clean Air Zones (CAZ compliance)
- Reduced carbon reporting footprints
Major UK cities like London are already seeing increased HVO adoption across fleets.
Final Thoughts
The difference between HVO and FAME biodiesel is not just technical—it directly impacts cost, performance, emissions, and long-term sustainability.
While FAME has served as a stepping stone in renewable fuels, HVO represents the future of diesel alternatives in the UK, offering superior performance and environmental benefits.
Frequently Asked Questions (FAQ)
1. Is HVO better than FAME biodiesel?
Yes, HVO is generally better in terms of performance, emissions, and storage stability. However, it is more expensive than FAME.
2. Can I use HVO in my diesel car in the UK?
Most modern diesel engines can run on HVO without modification, but it’s always best to check your manufacturer’s approval.
3. Why does FAME biodiesel have blending limits?
FAME contains oxygen, which can affect engine components and fuel stability, so it is usually limited to blends like B7 in the UK.
4. Is HVO available at UK fuel stations?
HVO is not yet widely available at retail fuel stations but is commonly supplied in bulk for commercial and fleet use.
5. Does HVO reduce carbon emissions?
Yes, HVO can reduce lifecycle greenhouse gas emissions by up to 90%, depending on the feedstock used.
6. What are the disadvantages of FAME biodiesel?
FAME can degrade over time, attract water, support microbial growth, and perform poorly in cold weather conditions.