What Stephill Generators does

Stephill Generators Ltd is a UK-based manufacturer of portable and mobile petrol and diesel generating sets ranging from 2.7kVA to 140kVA, with provision to manufacture up to 250kVA following a 2025 factory extension. Founded in 1985 in Peckham and now headquartered at a 50,000+ sq. ft facility in Wellingborough, Northamptonshire, the company is self-described as the UK's largest-volume manufacturer in its category. Its product portfolio spans entry-level portable petrol generators (Hobbygen, General Economy, Super Economy), rugged hire-fleet units (Hiremax), specialist lines for welding (Fusion TIN12, SW Welder), rail (Network Rail-approved Railtrack), welfare cabins, and super-silent 1500rpm diesel sets, plus battery/hybrid generators and lighting towers. Core technology combines engines from Honda, Kubota, Yanmar, and Perkins, with Mecc Alte and NSM alternators and Deep Sea Electronics control systems; EU Stage V compliance is positioned across the diesel range.

The company generates revenue primarily through one-time hardware sales of generators and spare parts, supplemented by after-sales service and technical support. Pricing is quote-based and varies by specification, power output, and customisation; a next-day parts delivery commitment is offered. Go-to-market is direct, with dedicated UK Sales, Export Sales, Parts, Technical, Service, Warranty, and Orders teams based at the Wellingborough HQ, plus exports to over 40 countries. Customer segments centre on UK hire and rental companies and construction firms, with secondary verticals in utilities, military, telecom, emergency services, rail, outdoor events, welfare, and standby/backup applications. Custom-build capability using in-house CAD is a key differentiator for specialised deployments, including a 160-unit Ukraine aid contract executed under UK Government foreign aid.

Name

Stephill Generators

Legal name

Stephill Generators Ltd.

Website

https://stephill-generators.co.uk

Company type

Private

Founded year

1985

Operating status

Operating

Headcount range

11–50 employees

Short description

Stephill Generators Ltd is the UK's largest-volume manufacturer of portable and mobile petrol and diesel generators (2.7-140kVA). Founded in 1985 and based in Wellingborough, it supplies UK hire firms and construction, plus exports to over 40 countries.

Ownership category

akta.pro rank

Product category

Portable Power Generation Equipment

NAICS

Engine, Turbine, and Power Transmission Equipment Manufacturing (3336), Turbine and Turbine Generator Set Units Manufacturing (333611)

SIC

Motors & Generators (3621)

akta.pro primary industry

Reciprocating Engine Generator Sets (Diesel/Gas/HFO) (IMAHAFAC)

akta.pro secondary industries

Emergency & Standby Diesel Generator Power (Critical Facilities) (EUACACAH), Remote & Islanded Oil/Diesel Power Generation (Off-Grid, Mini-Grids) (EUACACAG)

Keywords

• Portable generators
• Diesel generators
• Petrol generators
• Power generation equipment
• Standby generators

Headquarters

HQ city

Wellingborough

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Operations, Technology or R&D, Marketing or Sales

Revenue model

1. Generator Sales: Sale of portable/mobile petrol and diesel generating sets ranging from 2.7kVA to 140kVA. One-time hardware sales with pricing based on generator specifications, power output, and customisation requirements.
2. Parts and Spare Components: Extensive range of generator spares carried in stock including engine service kits, electrical components, engine, and alternator spares. Sold separately to generators for maintenance and replacement purposes.
3. After-Sales Service and Support: Combined sales and after-sales service including technical support, troubleshooting, and maintenance services. Next-day delivery commitment for parts required.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels4 records

Core offering

Stephill Generators designs and manufactures portable and mobile petrol and diesel generating sets from 2.7kVA to 140kVA at its UK facility in Wellingborough, supplying standard and custom-built units along with ATS panels, lighting towers, spare parts, and after-sales technical service. The product range covers hire/rental, construction, welfare, rail, standby, utility, telecom, military, and outdoor event applications, with EU Stage V compliant engines and Mecc Alte/NSM alternators, and exports to over 40 countries.

Product overview

Stephill Generators Ltd is the UK's largest volume manufacturer of portable and mobile petrol and diesel generating sets, producing equipment from 2.7 to 140kVA. The product portfolio is organized across multiple specialized lines: Hobbygen (compact inverter generators for leisure use), General Economy and Super Economy ranges (entry-level to industrial petrol generators), Hiremax (rugged units for rental applications), Fusion TIN12 (welding-specific units), Railtrack (Network Rail approved), SW Welder (welding equipment), Super Economy Silent Diesel and Super Silent Diesel ranges (quiet diesel power), Welfare Range (for welfare cabins), and larger 1500rpm diesel generators for hire fleet, construction, events, and standby applications. The company also offers battery generators with hybrid integration capability, lighting towers, ATS panels, changeover switches, and test equipment. Products feature engines from Honda, Yanmar, Kubota, and Perkins, alternators from NSM and Mecc Alte, and control systems from Deep Sea Electronics. The company exports to over 40 countries and offers custom build services for specialized applications.

Differentiator

Problem solved

Functional benefit

Products and services

• Hobbygen Lightweight, low-noise portable petrol inverter generator with Honda engine and inverter technology, designed for leisure, camping and caravanning applications.
• General Economy Range Non-industrial petrol generators (2.5-3.3kVA) powered by Honda GP series engines with NSM brushless alternators, intended for home and leisure use.
• Super Economy Range Versatile petrol generators from 2.7 to 10.0kVA with Honda GX range engines and NSM brushless alternators, suited to industrial and construction applications.
• Super Economy Plus Durable petrol generators (2.7-3.4kVA) with Honda GX engines and NSM alternators, designed for industrial and hire use.
• Hiremax Range Rugged petrol generators (2.7-6.5kVA) with heavy-duty NSM alternators and metal socket boxes, built for demanding hire and construction sector applications.
• Fusion TIN12 Range Petrol and diesel generators purpose-built for butt and fusion welding, with 110/55V CTE outputs conforming to TIN12/ECE3 specification.
• Railtrack Range Petrol and diesel generators (2.6-5.0kVA) specifically approved by Network Rail for rail track applications.
• SW Welder Range 200 Amp Honda GX390-powered AC and DC petrol welders with auxiliary power output for welding applications.
• Export Generator Range Diesel and petrol generators (2.6-6.5kVA) with non-EU noise compliance for general applications in developing countries.
• Super Economy Silent Diesel Range Quiet diesel generators (4.2-6.0kVA) with Yanmar engines, NSM alternators and close-fitting acoustic canopies for demanding hire and construction applications.
• Super Silent Diesel Range 3000rpm Portable diesel generators (6.0-10.0kVA) with Yanmar/Kubota EU Stage V engines, NSM alternators and acoustic canopies on two-wheel site trolleys for hire and construction.
• Welfare Range Diesel generators (6.0-17.8kVA) with Yanmar/Kubota EU Stage V engines, designed for welfare cabin installations with very low sound levels, compact footprint and single-side maintenance access.
• Super Silent Diesel Kubota & Yanmar Range 1500rpm Versatile diesel generators (12.0-21.0kVA) with Kubota/Yanmar EU Stage V engines, Mecc Alte alternators, multi-phase units with acoustic canopies for hire fleets, construction, events and standby use.
• Super Silent Diesel 1500rpm EU Stage V (29.3kW-136.8kVA)

Quantifiable outcome

• 100% load tested prior to despatch ensuring quality and reliability
• +3 more outcomes

Named customers7 records

Segments9 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Scale indicators6 records

Recent moves12 records

Expansion highlights6 records

Direct peers

• Pramac: Pramac is a leading European manufacturer of mobile and stationary generators and lighting towers, with a product portfolio that closely overlaps Stephill's portable/mobile diesel and petrol ranges and a similar focus on the rental and construction markets across Europe.
• Atlas Copco (Power & Flow division): Atlas Copco is a major global manufacturer of mobile diesel generators, lighting towers, and portable power solutions serving the construction and rental sectors - directly comparable to Stephill's core hire/rental customer base and product categories.
• SDMO / KOHLER-SDMO: SDMO (now part of Kohler) manufactures portable, mobile, and stationary generator sets across a similar kVA range to Stephill, with strong presence in the European rental and industrial markets - a closely comparable product offering and customer segment.
• Honda Power Equipment: Honda is both a key engine supplier to Stephill and a direct competitor in portable inverter and petrol generators through its EU-branded portable power range, competing in the same leisure, hire, and small-business segments.
• Himoinsa: Himoinsa designs and manufactures mobile, portable, and containerised generator sets with a strong presence in the European rental market, directly comparable to Stephill on product range, customer base, and Stage V compliant offerings.

Broad incumbents

• Generac Holdings: Generac is the largest US-based manufacturer of backup and portable generators, with a broad portfolio spanning residential, commercial, and industrial segments - a broader incumbent that overlaps with Stephill's standby and portable ranges.
• Cummins Inc. Cummins is a global manufacturer of diesel engines and generator sets across industrial, commercial, and rental applications - a broad incumbent whose generator business competes with Stephill in mobile and standby power.
• Caterpillar (Electric Power division): Caterpillar manufactures diesel and gas generator sets from small portable units up to multi-megawatt systems, competing with Stephill in the mobile and standby diesel generator categories through global dealer networks.
• Yamaha Motor (Power Products): Yamaha produces portable petrol generators and engines for similar leisure, construction, and small-business applications, with comparable kVA ranges to Stephill's petrol portfolio and overlap in compact portable product categories.

Emerging players

• Trime (Lighting Towers): Trime is a European specialist manufacturer of battery and diesel-powered lighting towers for the rental and construction sectors - an adjacent peer overlapping with Stephill's SLT5000 lighting tower product and hybrid power roadmap.

Market position

Strengths1 record

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/?gl=GB
• LinkedInlinkedin.com/company/stephill-generators-limited

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Stephill Generators