New and Used HFO Generators for Sale
USP&E HFO Generator Inventory at a Glance
- Total HFO inventory: 500+ MW
- Brands stocked: Wartsila, MAN, Hyundai HiMSEN, Niigata, Sulzer, Caterpillar MaK, STX
- Power range: 0.9 MW to 168 MW per unit
- Frequencies: 50 Hz and 60 Hz
- Condition: New, new surplus, and used (low-hour) units
- Configurations: Single units, complete plants, dual-fuel, marine-converted
- EPC delivery: 9 to 14 months from deposit
- Services included: Inspection, engineering, logistics, installation, commissioning, O&M
- Compliance: ISO 9001:2015, ISO 45001:2018, OFAC and FCPA compliant
Heavy fuel oil generators remain the most cost-effective baseload solution in markets where fuel price dominates lifetime operating expense. USP&E’s heavy fuel oil generator inventory currently spans more than 500 MW of new, used and surplus units in stock, with single-unit ratings from 0.9 MW up to 168 MW. The HFO generators for sale listed below cover both 50 Hz and 60 Hz configurations from the world’s leading reciprocating engine OEMs: Wartsila, MAN, Hyundai HiMSEN, Niigata, Sulzer and Caterpillar MaK.
Every unit is sourced directly from OEMs, independent power producers, banks and asset owners we know personally. No broker chains, no surprise condition issues. Single engines, complete plants, marine-converted gensets and dual-fuel variants are all available depending on stock at the time of enquiry.
What sets USP&E apart from a pure catalogue dealer is our in-house EPC and O&M capability. Since 2002, we have designed, built and operated more than 150 power stations across 45+ countries, with ISO 9001:2015 and 45001:2018 certifications, plus full OFAC and FCPA compliance. We deliver complete turnkey HFO power plants in 9 to 14 months from deposit, or step in to operate existing plants under long-term contract.
Click Fast Quote on any listing below for a response within hours.
HFO Generators by Manufacturer
USP&E stocks HFO generators for sale from the world’s leading reciprocating engine OEMs. Wartsila HFO generators are the most widely deployed for utility-scale baseload, with models including the 18V32, W20V32, W18V32 and 12V32LN families. MAN HFO generators (including MAN B&W marine variants) cover the 1 MW to 100+ MW range and are the OEM of choice for slow-speed efficiency.
Hyundai HiMSEN units are well-suited to mid-scale industrial sites. Niigata specialises in compact medium-speed units for mining and remote-grid applications. Sulzer legacy units remain in demand for proven 50 MW-class baseload. Caterpillar MaK engines bring Cat’s global parts and service network to HFO power generation. Anchor-linked browse by brand: Wartsila / MAN / Hyundai HiMSEN / Niigata / Sulzer / MaK.
HFO Generators by Power Output
USP&E’s HFO generators for sale span the full power range from sub-megawatt to 168 MW per unit, plus complete plants combining multiple units. Under 5 MW: suited to remote industrial, mining camps and island grids. 5 to 30 MW: mid-scale utility, cement plants, mining operations. 30 to 168 MW per unit: utility-scale baseload, IPP projects, national grid support. For projects requiring more than 168 MW from a single supplier, USP&E aggregates multiple units into complete HFO power plants under one EPC contract.
HFO Generators by Frequency
USP&E stocks HFO generators for sale in both 50 Hz and 60 Hz configurations to suit different grid systems globally. 50 Hz units serve Europe, Africa, Middle East, most of Asia and Oceania. 60 Hz units serve the Americas, Korea, parts of Japan and Saudi Arabia industrial. USP&E also offers frequency conversion engineering for buyers redeploying a unit to a different grid system, typically adding 3 to 6 months to delivery and 8 to 15% of unit price depending on engine size.
Power Plant EPC and O&M Services
USP&E delivers complete turnkey HFO power plants under engineering, procurement and construction (EPC) contracts, with typical delivery of 9 to 14 months from deposit. Our in-house engineering teams handle site survey, FEED engineering, equipment procurement, frontier-market logistics, civil and mechanical installation, electrical and instrumentation, commissioning and grid synchronisation. Beyond EPC, USP&E provides long-term operations and maintenance (O&M) contracts for HFO power plants. Documented O&M results on existing client sites include 95% plant availability and cost reduction optimisations per engine within the contract period.
HFO Generator Buying Guide
Buying a used HFO generator requires technical due diligence beyond what’s typical for diesel gensets.
Key inspection points include engine running hours (well-maintained HFO engines reach 80,000 to 120,000 hours before major overhaul), last overhaul date and scope, fuel system condition (preheaters, separators, viscosity control), turbocharger condition, cylinder liner and piston ring inspection records, lube oil analysis history, cooling water chemistry records, and balance-of-plant completeness.
USP&E inspects every used HFO generator before listing and provides a technical condition summary with each Fast Quote response.
HFO Power Plant Balance of Plant
A complete HFO power plant requires significant balance-of-plant (BOP) infrastructure beyond the generator set. USP&E’s EPC scope includes HFO storage tanks (heated, sized for 14 to 30 days of operation), fuel treatment skids (purifiers, separators, viscosity controllers, preheaters), lube oil storage and treatment, cooling water systems, exhaust gas systems (silencers, SCR for NOx where required), step-up transformers, switchgear and grid interconnection, civil works (foundations, engine hall, control room, fuel bund), fire detection and suppression, and plant control / SCADA. BOP typically adds 30 to 60% on top of the generator set cost.
USP&E HFO Project Track Record
Mali: 100+ MW Mining Power Plant Recovery (2021 to present). USP&E recovered a critical-condition 100+ MW HFO power plant for a major mining operation, taking over from a previous O&M contractor. The fleet of 15 Caterpillar CM32 reciprocating engines suffered severe limestone scale, turbocharger inefficiencies, contaminated fuel and lube oil, and corroded pistons. USP&E delivered 95% plant availability and 66% cost reduction per engine within the contract period. Read case study.
Additional HFO project references across Sierra Leone, Liberia and other frontier markets available on request.
HFO vs Diesel vs Natural Gas Generators
| Factor | HFO | Diesel | Natural Gas |
|---|---|---|---|
| Fuel cost per kWh | Lowest (residual fuel) | Mid | Lowest where pipeline gas available |
| Capital cost per MW | Highest | Lowest | Mid |
| Typical lifetime | 25-30 years | 20-25 years | 20-25 years |
| Emissions | Highest | Mid | Lowest |
| Fuel infrastructure | Heated tanks, separators | Standard tanks | Pipeline or LNG |
| Best fit | Baseload, frontier markets | Peaking, backup, mobile | Where gas exists |
HFO Generator FAQ
What is an HFO generator and how does it work?
An HFO generator is a heavy fuel oil reciprocating engine generator set that burns residual fuel oil (typically RME180, RMG380 or IFO380) as its primary fuel. The engine drives an alternator to produce electricity. HFO requires fuel heating, separation and viscosity control upstream of the engine. HFO generators run at slow speeds (500-750 rpm), which extends engine life to 25-30 years under proper maintenance, making them the preferred choice for baseload power in cost-sensitive markets.
What is the difference between new and used HFO generators?
New HFO generators are factory-fresh with manufacturer warranties, zero accumulated runtime, and full OEM support. Used HFO generators have prior operating hours and offer significant capital savings — typically 40-70% below new pricing. USP&E inspects every used HFO generator before listing and provides a technical condition report with each Fast Quote. The right choice depends on project budget, financing terms, and required asset life.
What HFO generator brands does USP&E sell?
USP&E currently stocks HFO generators from Wartsila (9 units), MAN (7 units including MAN B&W marine variants), Niigata (3 units), Sulzer (1 unit) and Caterpillar MaK (1 unit). Our HFO inventory rotates regularly as units are sold and new stock arrives, so brand availability changes. USP&E can also source specific OEM models on request through our supplier and asset-owner network.
What is the smallest and largest HFO generator USP&E offers?
USP&E’s smallest HFO generator currently in stock is the MAN 5L21/31 at 0.9 MW (60 Hz, 2013). The largest single-unit HFO generators in current stock are the MAN 18V32/40CD at 108 MW (50 Hz, 2014) and the Wartsila W20V32 at 107 MW (50 Hz, 2010). For projects requiring greater than 108 MW from a single supplier, USP&E aggregates multiple units into complete HFO power plants under EPC contract.
Can HFO generators be converted between 50 Hz and 60 Hz?
Frequency conversion of an HFO generator requires re-engineering the alternator winding configuration, modifying engine governing and control systems, and verifying mechanical resonance at the new speed. USP&E offers frequency conversion engineering for buyers redeploying a unit to a different grid system. The work typically adds 3-6 months to delivery and costs 8-15% of unit price depending on engine size and original configuration.
What is the typical lead time to install an HFO power plant?
USP&E delivers complete turnkey HFO power plants in 9 to 14 months from deposit, under engineering, procurement and construction (EPC) contracts. Lead time depends on site conditions, customs and logistics complexity, and balance-of-plant scope. Mobile and skidded units can deploy faster (4 to 8 months). Greenfield utility-scale plants with full civil works and grid interconnection typically take 12 to 18 months.
What is the cost per MW installed for a used HFO power station?
Cost per MW installed for a used HFO power station typically ranges from US$400,000 to US$900,000 per MW, depending on engine age, condition, balance-of-plant scope, site logistics and grid interconnection complexity. New HFO power stations typically cost US$1.2M to US$1.8M per MW installed. USP&E provides project-specific cost estimates as part of every Fast Quote response — we don’t publish flat per-MW rates because real costs depend on site-specific factors.
Does USP&E offer EPC and O&M services for HFO power plants?
Yes. USP&E delivers complete EPC contracts for new and refurbished HFO power plants, with typical 9 to 14 month delivery from deposit. Beyond EPC, USP&E provides long-term operations and maintenance contracts. Documented O&M results on existing client sites include 95% plant availability and 66% cost reduction per engine. Our in-house teams hold ISO 9001:2015 and ISO 45001:2018 certifications.
Where does USP&E ship HFO generators?
USP&E ships HFO generators globally, with deep operational experience in frontier markets across Africa, the Middle East, Asia and South America. We have built more than 150 power stations in 45+ countries since 2002. Our logistics teams handle freight, customs clearance, project cargo and inland transport including the challenging final-mile logistics typical of remote mining, oil and gas, and grid-deficient sites.
How do I inspect a used HFO generator before buying?
USP&E offers documented technical inspection on every used HFO generator before sale: engine running hours, overhaul history, fuel system condition, turbocharger condition, cylinder liner and piston ring records, lube oil analysis, and cooling water chemistry. Buyers can also commission an independent third-party inspection at the storage site. Inspection reports are provided as part of our Fast Quote response, typically within hours of enquiry.