Booker Watford – Cornerstone Group

Booker Watford
Solar PV System & New Roof Installation

Project Background

Booker Watford, a leading wholesale supplier, sought to reduce operational costs and improve energy efficiency while ensuring long-term structural reliability. The existing roof required replacement, presenting an ideal opportunity to integrate a solar PV system. The project was delivered through a strategic partnership between Cornerstone Group (solar specialists) and NWIR (roofing experts), ensuring seamless integration of the new roof and solar array.

The goal was to maximise energy generation, minimise payback time, and secure a durable solution with a 20-year warranty on both the roof and solar PV system.

Client: Booker Wholesale (Watford Branch)
Industry: Cash & Carry Wholesale
Location: Watford, UK
System Size: 334 kWp Solar PV System
Roof Solution: New roof with integrated solar PV system
Partners:

Solar PV Installation: Cornerstone Group
Roofing Solution: NWIR (North Wales Industrial Roofing)
Warranty: 20-year warranty on both roof and solar PV system
Export Limit: 200 kW to the grid
Payback Period: 3.1 years

The Solution

New Roof Installation by NWIR:

High-quality, weather-resistant roofing system designed to support solar PV panels.
Enhanced structural integrity to withstand long-term environmental factors.

334 kWp Solar PV System by Cornerstone Group:

High-efficiency solar panels optimised for commercial energy generation.
Smart inverter technology to manage export limits (capped at 200 kW to comply with DNO requirements).
On-site consumption prioritisation to reduce grid dependence.

20-Year Warranty:

Comprehensive warranty covering both the roof (NWIR) and solar PV system (Cornerstone Group), ensuring long-term performance and peace of mind.

Financial Benefits

Payback Period: 3.1 years (due to high energy savings and government incentives).
Reduced Energy Bills: Significant savings from on-site solar generation.
Export Revenue: Excess energy (up to 200 kW) exported to the grid generates additional income.
Low Maintenance Costs: High-quality materials and a warranty reduce long-term upkeep expenses.

Environmental Impact

Carbon Savings: Estimated reduction of ~70 tonnes of CO₂ annually (based on 334 kW system displacing grid electricity).
Sustainable Operations: Aligns with Booker’s corporate sustainability goals and supports the UK’s net-zero targets.

Conclusion

By partnering with Cornerstone Group for solar and NWIR for roofing, Booker Watford has secured a cost-effective, energy-efficient, and future-proof solution. The 3.1-year payback, 20-year warranty, and ~70-tonne annual CO₂ reduction demonstrate the project’s financial and environmental success.