The Complete Guide to Buying Used Diesel Generators in the UK (2026 Edition)
Demand for dependable standby and prime power generation continues to rise across the United Kingdom and international markets. As businesses, farms, data centres, construction firms, telecom operators, and residential property owners adjust to higher energy costs, grid instability, and complex infrastructure demands, interest in Used Generators For Sale UK has increased significantly.
Reliable power is no longer optional for businesses. From construction sites and factories to data centres and farms, uninterrupted electricity is critical. As energy costs rise and supply uncertainty increases, more businesses are choosing used diesel generators in the UK as a smart, cost-effective power solution.
This comprehensive guide explains everything you need to know about buying a used generator, how to avoid costly mistakes, and why purchasing from a trusted supplier like Used Generator Trader can save you money while delivering dependable performance.
Why Used Diesel Generators Are in High Demand
The UK market for second-hand generators has grown rapidly over the last decade. Businesses are no longer viewing used equipment as “second best” — instead, they see it as proven, practical, and financially sensible.
Key reasons behind this growth include:
Rising electricity costs
Increased power outages and grid pressure
Faster availability than new generators
Major cost savings
Sustainability and reuse initiatives
Well-maintained used diesel gensets can operate reliably for decades, making them ideal for both short-term projects and long-term backup power.
Advantages of Buying Used Generators Instead of New
1. Lower Capital Investment
A new generator can be expensive and unnecessary for many applications. Used generators for sale in the UK typically cost 30–60% less, allowing businesses to preserve cash flow.
2. Immediate Availability
New generators often involve long lead times. With used generators in stock, you can secure power immediately — critical for emergencies and tight project deadlines.
3. Proven Performance
Used generators have a known operating history. When serviced and load-tested, they offer reliable output with minimal risk.
4. Reduced Depreciation
New equipment depreciates rapidly. A pre-owned generator holds its value far better, especially from premium brands.
Common Applications for Used Diesel Generators
Used generators are incredibly versatile and used across many sectors:
Construction & Infrastructure
Site power
Temporary power
Remote locations
Industrial & Manufacturing
Continuous power supply
Load balancing
Backup for machinery
Commercial & Business
Offices
Warehouses
Retail premises
Agriculture
Farms and irrigation
Livestock facilities
Grain storage
Critical & Emergency Power
Hospitals
Data centres
Telecom towers
Choosing the Correct Generator Size (kVA Explained)
Selecting the wrong size generator is one of the most common — and costly — mistakes.
Small Power Requirements
20–50 kVA used generators
Ideal for small businesses, shops, and mobile units
Medium Power Requirements
100–500 kVA used diesel generators
Suitable for factories, warehouses, and offices
Large Power Requirements
1000 kVA+ industrial generators
Used in data centres, hospitals, and heavy industry
Always calculate:
Total load
Starting (surge) power
Future expansion needs
Diesel vs Other Fuel Types
While petrol and gas generators exist, diesel generators dominate the used market.
Why Diesel?
Better fuel efficiency
Longer engine life
Higher load capacity
Safer fuel storage
This is why used diesel generators remain the preferred choice for commercial and industrial applications.
Leading Used Generator Brands You Can Trust
At Used Generator Trader, we specialise in premium brands known for durability:
Perkins used generators
Cummins used generators
Caterpillar diesel generators
MTU generators
Volvo Penta generators
FG Wilson generators
Atlas Copco generators
These brands are widely supported in the UK, making parts and servicing readily available.
What to Inspect Before Buying a Used Generator
Before purchasing any used power generator, always confirm the following:
Verified engine hours
Full service and maintenance records
Load bank testing completed
Alternator and AVR condition
Control panel functionality
Cooling and exhaust systems checked
Generator fully serviced and ready to run
Buying from a reputable used generator supplier in the UK reduces risk and ensures reliability.
Used Generators for Export Markets
The UK is a major hub for used generator exports due to high maintenance standards.
Popular export destinations include:
Africa
Middle East
Asia
Eastern Europe
UK-supplied generators are trusted globally for their quality, making them excellent for resale and long-term operation overseas.
Selling Your Used Generator in the UK
Many businesses hold unused or surplus generators that retain strong resale value. Selling your generator can:
Recover capital
Free up storage space
Support sustainability goals
Used Generator Trader works with companies looking to sell used generators, offering fair valuations and fast transactions.
Sustainability and Environmental Benefits
Buying used generators supports:
Equipment reuse
Reduced manufacturing emissions
Lower carbon footprint
Circular economy practices
Choosing second-hand generators is both financially and environmentally responsible.
Why Buy from Used Generator Trader?
We offer:
Carefully sourced used generators
Trusted UK supplier network
Competitive pricing
Export and logistics support
Industry expertise
Whether you need used generators for sale, want to export equipment, or wish to sell surplus stock, we provide end-to-end support.
Final Thoughts
A used diesel generator is a powerful investment for businesses seeking reliable power without excessive costs. When purchased from a trusted supplier, used generators deliver years of dependable service across a wide range of industries.
If you are looking to buy or sell used generators in the UK, explore our latest stock or contact Used Generator Trader today.
