NHS — worked example (modelled)
380 kWp NHS Acute Trust Solar Install
Illustrative modelled example, not a real project. A UK NHS Acute Trust commissions 380 kWp across the main hospital roof. Annual saving £108k, modelled with a Phase-4-era PSDS grant (PSDS has had no open window since November 2024). Install protocol designed around infection control and clinical operations.
Illustrative worked example — not a real project
This scenario is modelled from this site\'s published cost, yield, tariff and payback bands for the sector. No customer, contract, site or measured result is claimed — this site is an independent publisher and does not install. Use it to sanity-check an installer\'s proposal, not as evidence of anyone\'s delivery.
380 kWp
System size
345,000 kWh
Annual yield
£108,000
Annual saving
PSDS (closed)
Phase-4-era grant assumed
NHS Acute Trust operating a regional district hospital — 450 beds, 24/7 operation, 1.8 GWh annual electricity. Commercial tariff: 30p/kWh. Trust contributes to Net Zero NHS commitment (2030 for Scope 1+2).
The Site
NHS Acute Trust operating a regional district hospital — 450 beds, 24/7 operation, 1.8 GWh annual electricity. Commercial tariff: 30p/kWh. Trust contributes to Net Zero NHS commitment (2030 for Scope 1+2).
The modelled system
- Panels: 635 × Trina Vertex S+ 600W
- Inverters: 4 × SMA Sunny Tripower CORE2 110kW
- Mounting: Ballasted at 10°; coordinated with RAAC panel screening
- Grant assumed: 75% of capital (Phase-4-era PSDS; scheme now closed)
- Infection control: Fenced section working; no clinical area entry
- Indicative programme: 11 weeks
Design approach in this scenario
A Phase-4-era PSDS grant is assumed to cover 75% of capital (PSDS has had no open window since November 2024). The install protocol is developed with the Trust's infection prevention team — working within fenced sections of the roof, no entry to clinical areas, controlled materials movement. RAAC roof panel screening completed before scaffolding install.
Modelled outcome
Indicative programme: 11 weeks. Year-1 generation 4% modelled. Annual saving £108k.
Key numbers (modelled)
- System size: 380 kWp
- Annual generation: 345,000 kWh
- Annual saving: £108,000
- Payback: immediate in the grant-funded scenario (without a grant, 4–6 years)
- CO2 displaced: 78 tonnes/yr
For the sector guide behind this scenario, see Solar for NHS healthcare.
Frequently Asked Questions
How were these numbers calculated?
Every number is modelled from this site's published cost per kWp, sector yield and self-consumption bands, and the tariff stated in the scenario. Nothing here is measured from a real installation — this site is an independent publisher and holds no project data.
Can a similar system be built for my business?
The scenario is sized on typical UK values for the sector. An installer can model your own site from half-hourly meter data and roof drawings — request matched quotes and ask for the model, not just the price.
Why publish worked examples rather than customer case studies?
Because this site does not install anything, it has no customers to write up. Worked examples show the arithmetic transparently, which is what you need to judge an installer's proposal against.
How does payback vary between sectors?
Across the sector scenarios on this site payback typically falls in the 3.5–5.5 year range on capital purchase — continuous daytime loads at the low end, weekday-only sites at the high end. See the cost and payback guides for the bands behind each figure.
Can I visit a live installation?
Ask the installers quoting your project for reference sites of a similar size and sector, and speak to the operator directly — a credible installer will arrange it.
Related Guides
Ready to Reduce Your Energy Costs?
Compare quotes from commercial solar installers covering your area. We are an independent publisher — your enquiry goes to an installer, not a sales team.
Independent publisher · Enquiries passed to installers · No obligation