Overview of works
The original target was 11 stations, but we added a twelfth within the client’s budget. Each station received solar PV, a 10kW battery and associated equipment, with the aim of a minimum 16kWp per site. Because the roofs were flat, we used a ballasted mounting system. It needs no fixings through the roof, so it was quick to install and protects the roof structure for the long term.
Before work could start, each station needed Generation 99 (G99) approval from the National Grid, in line with Engineering Recommendation G99. We carried out roof assessments and structural surveys at every station, and submitted Distribution Network Operator (DNO) applications to avoid voltage fluctuations when connecting to the grid.
Challenges
The funding deadline left tight timescales, and DNO and G99 approvals took up to 16 weeks per station. NWAS was flexible about the order in which stations were completed, so we started each one as soon as its approval came through. Each station took three weeks, and the team worked across several sites at once to meet the deadline.
The works also ran through winter, so we planned around the forecast and moved to battery installation when heavy rain was due.
Stakeholder engagement
The stations stayed fully operational throughout. We agreed a coordination plan with staff to work around shift patterns and keep access clear for crews and vehicles at all times. We also segregated parking and put scaffolding in unobtrusive locations.
Sustainability & environmental impact
Through our joint venture business, Circle, 100% of waste was diverted from landfill. We required all suppliers and subcontractors to use ethically sourced materials and asked them for modern slavery statements.
Outcomes and benefits
We worked collaboratively with NWAS and were involved early, so all surveys were completed on time. The project finished on time and within budget, with no client variations.
“It’s been a pleasure working with Seddon to deliver our part of the Department for Energy Security and Net Zero £180m of funding from Great British Energy… NWAS secured £412k for solar and battery projects across 12 sites, which Seddon have helped us to refine by strategically choosing sites… and flexibility for the sites to have works completed before the deadline of 31/03/2026.”
Jon Byrne, Sustainability & Environmental Manager, NWAS
