Specialist high voltage electrical design for DNOs, IDNOs, and infrastructure developers. 33/11kV primary substations, complex cable schemes, and full DNO submission packages — delivered with technical rigour, no layers.
End-to-end high voltage design — from feasibility through to IFC packages and full DNO submission.
New-build and refurbishment primary substation design from concept to IFC — SLDs, equipment schedules, GA drawings, full design packages.
33kV and 11kV underground cable route design — cable sizing, thermal ratings, joint bay positioning, and detailed cable schedules.
Complete Part A and Part B design packages for DNO and IDNO projects — all drawings, schedules, and supporting documentation.
Front-end engineering studies — options appraisals, technical constraint reviews, and preliminary scope definition for HV infrastructure.
High-quality CAD deliverables — SLDs, GA drawings, cable route plans, and as-built records to client and DNO standards.
Independent technical review, design assurance, and advisory support for developers, contractors, and asset owners on HV infrastructure.
RDE is building a suite of engineering tools and digital products alongside its consultancy work. Each tool is purpose-built for HV and LV design professionals — more launching as the ED2 programme continues and ED3 approaches.
Direct access to RDE's core HV design and DNO submission capability. Hands-on, no layers.
A dedicated LV network design and delivery platform — built for the demands of the upcoming ED3 investment programme.
Further engineering tools and digital products are in development. Register interest to be notified on launch.
Practical HV engineering reference material in development — technical packs and guides built for DNO and infrastructure professionals. Coming soon.
A practical Part A/B submission checklist covering typical DNO drawing and documentation requirements.
A comprehensive technical reference for primary substation design — SLD structure, equipment specification, and IFC deliverables.
Cable sizing methodology, thermal rating worked examples, and route design considerations for 11kV and 33kV underground schemes.
Additional technical guides and reference packs are being developed. Register interest to be notified on launch.
Randall Design & Engineering is an independent HV electrical design consultancy operating across the UK. Deep DNO framework knowledge, hands-on design delivery, and a curated associate network.
Actively delivering complex HV projects through RIIO-ED2, while building the capacity model and service structure to meet the demands of the upcoming ED3 investment period.
Direct delivery. No layers between the brief and the engineer doing the work.
Scalable specialist capacity without compromising on quality or technical oversight.
Active RIIO-ED2 delivery across complex HV programmes, with a service model being shaped now for the scale of ED3.
Whether you have a live project, need capacity support, or want to understand how RDE fits into your delivery framework — get in touch directly.