Refresco–GB NRG rooftop solar: design, yield and PPA takeaways for engineers
Reviewed by Tom Sullivan
First reported on The Construction Index
30 Second Briefing
Refresco is installing 21.5MWp of rooftop solar across four UK sites with GB NRG, centred on an 8.5MWp array at its Bridgwater factory that will be the country’s largest PV system on a single continuous roof. The Bridgwater installation will use over 18,000 high‑efficiency modules to generate about 7.5GWh/year, supplying roughly 17% of the site’s electricity demand directly behind the meter and cutting grid import. GB NRG will design and deliver the programme, with Zestec Renewable Energy funding and operating it under long‑term PPAs backed by Octopus Energy Generation funds.
Technical Brief
- GB NRG secured the four-site EPC role after a competitive tender against 12 commercial PV providers.
- Zestec Renewable Energy will own and manage the PV assets under long-term Power Purchase Agreements.
- Octopus Energy Generation-managed funds provide the long-term capital backing for the PPA structure.
- GB NRG also acted as commercial advisor, taking the portfolio to market to secure the funder-operator.
- Behind-the-meter configuration reduces exposure to future grid price volatility and non-commodity charges.
- Long-duration PPAs lock in discounted electricity pricing relative to grid import for Refresco’s UK operations.
- Model provides a replicable template for large industrial roofs where onsite generation offsets process loads.
Our Take
Within our 935 Infrastructure stories, UK industrial sites rarely feature rooftop systems above the low single‑MW range, so a 21.5 MWp portfolio signals that beverage and food plants are starting to treat on‑site generation as core utility infrastructure rather than a marginal add‑on.
Covering only 17% of Refresco's Bridgwater electricity demand despite 7.5 GWh/year output underlines how power‑intensive modern bottling lines are, suggesting similar factories will need a mix of rooftop, ground‑mount and offsite PPAs to materially de‑risk energy costs.
The financing tag and involvement of Octopus Energy Generation and Zestec Renewable Energy indicate that third‑party capital is comfortable with large UK rooftop assets at this scale, which is likely to lower the hurdle for other manufacturers considering multi‑MWp installations on constrained sites.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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