Renew Holdings has acquired Porter Brothers Holdings, the parent company of PBU (UK), through its Excalon subsidiary in a transaction worth up to £50 million. The deal adds extra-high-voltage cable engineering and directional drilling capability to the group’s UK electricity network operations. Renew is paying £31.1 million initially, with a further £18.9 million dependent on PBU meeting specified profit targets over the following three years. The upper purchase price is therefore contingent rather than a wholly completed cash payment.
PBU provides specialist extra-high-voltage cabling and directional drilling services to the electricity distribution market. Those capabilities sit alongside Excalon’s electrical engineering and civil delivery operations and the design skills added through other acquisitions. A project involving buried cables can require several separate stages, from route assessment and ground investigation to civil works, installation, jointing and commissioning. Renew expects the new subsidiary to increase the proportion of those stages it can deliver within the group, although no new contract award or integration timetable accompanied the acquisition.
Directional drilling is relevant to electricity network construction where cable routes must pass beneath roads, railways, waterways or other obstacles without excavating an open trench for the full crossing. The technique generally involves creating a guided bore and installing a duct or product pipe through which a cable can be placed. Ground conditions, drilling fluid management, minimum bend radius, available working space and the design of cable joints all constrain how a route is delivered. Owning drilling expertise does not remove those engineering and permitting requirements, but it broadens the range of delivery methods Excalon can offer.
The purchase also adds extra-high-voltage cabling services, a specialist field in which route design, handling, installation and testing have to be coordinated with the requirements of the network owner. Cable installation is not interchangeable with overhead line engineering or civil excavation alone. Thermal performance, cable spacing, mechanical protection and access for future maintenance influence the completed installation. The company’s broader service range may allow these activities to be managed alongside civil and electrical works, although any single project will still be governed by its specification and the qualifications of the delivery team.
The acquisition follows Excalon’s purchases of Emerald Power, Electricity Distribution Engineering Services (EDES) and PWR-X, extending a portfolio already operating in the electricity network market. EDES added design expertise covering underground and overhead electrical infrastructure, while PBU brings installation and drilling capability. Renew is assembling services across engineering design and site delivery rather than entering the sector for the first time. Contract specifications and client procurement arrangements will still determine which elements can be awarded together.
Renew has based the acquisition on PBU’s sustainable annual earnings before interest and tax of £3.9 million and EBITDA of £5.5 million, as reported by the buyer. Its existing banking facilities financed the £31.1 million initial cash consideration. The remaining payment, capped at £18.9 million, depends on the sellers achieving defined profit targets over three years, so the £50 million headline is a maximum rather than cash already paid. Renew expects an immediate uplift to earnings, but the contribution will only become measurable in subsequent group reporting.
Electricity network companies are investing under regulated price controls that determine permitted revenues and required outcomes rather than directly awarding work to contractors. Ofgem’s distribution settlement RIIO-ED2 covers 2023–28, while transmission RIIO-T3 covers 2026–31. Renew identifies around £50 billion to £60 billion of network investment across these periods and beyond as the wider opportunity for engineering suppliers. That figure is the group’s estimate of sector expenditure; it is not the value of work awarded to PBU, Excalon or Renew.
Network reinforcement and new connections require contractors to coordinate civil and electrical engineering with installation and testing. A new underground cable route may also need access arrangements, duct crossings, joints and a commissioning sequence agreed with the network owner. Having design and site delivery disciplines in one contracting group could reduce the number of organisational handovers, but this outcome depends on the client procurement model and each project’s scope. Renew has not quantified cost savings or shorter build periods arising from the PBU acquisition.
PBU has been acquired by Excalon Holdings on a cash-free, debt-free basis, adding its specialist teams and services to Renew’s existing electricity network operation. No workforce restructuring, operating-name change or contract transfer has been detailed. The buyer’s immediate financial obligation is the £31.1 million initial payment, with any further consideration tied to PBU’s profitability over three years. The scale of cross-selling or combined contract delivery will depend on client awards and subsequent performance, neither of which was quantified in the acquisition announcement.
