Project duration: July 2017 to September 2019

Regen’s whole-system thinking is seeking to understand how both the electricity and gas networks will evolve, in a decentralised and decarbonised UK energy system. Building on the growth scenarios work Regen has undertaken for WPD and other DNOs, Wales and West Utilities (WWU) commissioned Regen to develop a methodology to create regional growth scenarios to support long term demand and investment planning for the gas network.


The development of this methodology used common assumptions and approaches that Regen developed for electricity network scenarios, but also developed an approach that was bespoke for sources of demand and supply connected to gas distribution networks. The scenarios focus on the evolution of heat demand, delivery technologies and fuels, the growth of gas fired power generation and the changing gas supply mix, including the introduction of hydrogen and injection of biomethane.

WWU used the outputs of this assessment of their network, to inform their business plan submission to Ofgem in 2019.

WWU Business Plan DFES

Figure 1: Progression of WWU’s Net Zero Vision, based on Regen’s DFES analysis. (Credit & Source WWU RIIO-GD2 business plan, December 2019, WWU website)

The outputs of the project are available to download:

Regional FES Phase 1 Inception And Scoping Report Regional FES Phase 2 SW Regional Results Report Regional FES Phase 3 Wales Regional Results Report Regional FES Technical Companion Document

Wales And West (cropped)




To find out more about this project, or our scenarios work more generally, contact Ray Arrell at


People on this project

Ray Arrell
Head of technical development
Ray leads Regen's technical development strategy, coordinating the development of the company's capabilities and…
Johnny Gowdy
Johnny is a director of Regen and leads the development of our advisory projects,…
Jonty Haynes
Energy analyst
Jonty is an Energy Analyst at Regen delivering a range of technical support services.…
Mark Howard
Project Manager
Mark holds a bachelors degree in engineering and has over a decade of experience…

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