Stephill Generators meets demand for low-emission power within the rental sector

The introduction of the Stage V emissions standards has seen a surge in demand for compliant power solutions in the generator rental market. Stephill Generators, one of the UK’s largest genset suppliers into the rental sector, wanted to upgrade its current gensets and install 70 compliant engines for the rental equipment specifically used for its larger rental customers and approached DiPerk Power Solutions for support.

The new emissions standards, which came into force in January 2019 and January 2020, applies to engines installed in non-road mobile machinery or equipment that is used in the construction, agriculture, materials handling and industrial sectors. The new regulations mean that generator manufacturers must equip their engines with specialist aftertreatment devices that monitor and limit harmful emissions released from the exhaust. 

Stephill Generators, who are based in Northamptonshire and established in 1985, has grown to become one of the UK’s largest volume manufacturers of portable petrol and diesel gensets, providing equipment to companies within the construction, rental, events, utility, leisure, and standby power sectors.

Wayne Vincent, Head of Distribution Sales at DiPerk, explained how the engineering team had developed a bespoke design that included a specialist cooling package fitted to a Perkins engine package. 

“We’ve had a longstanding relationship with Stephill Generators, so when they requested assistance with a quantity of Stage V compliant 55kw engines, we began designing and prototyping an engine to match, which is essentially an adaptation of our industrial 904J variable speed engine model.

“Following successful testing we’ve now begun supplying these specially modified, compliant engines and expect to see a further increase in orders as demand on Stephill to supply generators to its construction clients is set to continue.”

Stephill Generators prides itself on quality and reliability and the strict use of premium brand components in its products. DiPerk was the logical partner in this scheme because of the expertise of its engineers who were able to configure a solution to ensure the Perkins engine was fully compliant with the low emissions regulations. 

Paul Livingstone, Director at Stephill Generators, explained how they were extremely pleased with the engine outputs and the support from the team at DiPerk.

“We’re very familiar with Perkins engines having used them for many years within our generators, and the quality of their products is essential as we are always careful not to dilute our brand names with inferior components.

“Even now many of our rental customers are unaware of the emissions compliance changes, so it is essential we remain at the forefront of the standards so we can help future proof them and their customers.

“We have a reputation for being able to supply generators on a short lead time, so the responsiveness of DiPerk to deliver the right solution and their product implementation support has been invaluable.”

Perkins engines are ideally suited to all power generation applications, with more than 150,000 diesel engines supplied every year for the electric power generation market. All engines are supplied with a global Perkins warranty, worldwide service back-up, compact design for easy installation and are compliant with the latest emissions legislation.

For more information on how DiPerk can provide reliable, Stage V compliant power for your application, visit

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