Hospital Solar Panel Costs: Ranges by Estate Type and Size
No public benchmark covers hospital-scale rooftop solar, so this page gives illustrative ranges from a simple sizing model, the assumptions behind them, and what moves the price. Use them to frame a budget, then get a surveyed quote.
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Illustrative ranges by estate type
The ranges on this page are illustrative planning figures from a simple sizing model, not quotes, market data or a published benchmark. They assume roughly 900 to 920 kWh of generation per kWp per year and about 0.23 kg of CO2 per kWh displaced. Actual cost depends on the roof, the electrical infrastructure, access and the contract route, so treat any figure as a prompt for a surveyed quote.
| Estate type | Illustrative system | Illustrative installed cost | Modelled annual generation (kWh) | Simple payback at 15p / 20p / 25p per kWh |
|---|---|---|---|---|
| Acute hospital | 300 kW to 2 MW (550 to 3,700 panels) | £250,000 to £1,600,000 | 275,000 to 1,840,000 | 6.7 / 5.1 / 4.0 years |
| Community hospital | 100 to 500 kW (185 to 920 panels) | £90,000 to £450,000 | 92,000 to 460,000 | 7.2 / 5.4 / 4.3 years |
| Mental health unit | 100 to 400 kW (185 to 740 panels) | £90,000 to £360,000 | 92,000 to 370,000 | 7.2 / 5.4 / 4.3 years |
| GP surgery or health centre | 20 to 80 kW (37 to 150 panels) | £22,000 to £90,000 | 18,000 to 73,000 | 10.9 / 8.1 / 6.5 years |
| Dental or ophthalmic practice | 10 to 50 kW (18 to 92 panels) | £12,000 to £55,000 | 9,000 to 46,000 | 11.9 / 8.9 / 7.1 years |
Assumptions behind the paybacks. Installed cost is the low end of each range divided by the low end of modelled generation. On-site use is assumed at 90% for 24/7 estates (acute, community, mental health) and 75% for daytime-only practices; exported electricity is valued at nil, which is conservative. The three prices are the cost of the grid electricity each kWh avoids; use your own tariff, because that is the number that moves the answer most. No operating cost, inverter replacement, degradation, grant or tax effect is included.
Cost ladder by system size
The same model, set out by size instead of by estate type. Use the row nearest your roof; the estate table above says which building types usually sit in which size.
| System size | Assumed cost per kW | Illustrative installed cost | Modelled annual generation (kWh) | On-site use assumed | Simple payback at 15p / 20p / 25p per kWh |
|---|---|---|---|---|---|
| 50 kW | £1,100 | £55,000 | 46,000 | 75% | 10.6 / 8.0 / 6.4 years |
| 100 kW | £950 | £95,000 | 92,000 | 90% | 7.6 / 5.7 / 4.6 years |
| 250 kW | £880 | £220,000 | 230,000 | 90% | 7.1 / 5.3 / 4.3 years |
| 500 kW | £850 | £425,000 | 460,000 | 90% | 6.8 / 5.1 / 4.1 years |
| 1,000 kW | £800 | £800,000 | 920,000 | 90% | 6.4 / 4.8 / 3.9 years |
Assumptions. Cost per kW is chosen to fall from £1,100 at 50 kW to £800 at 1,000 kW and to sit inside the estate ranges above; it is a modelling assumption, not a benchmark or a quote. Generation is 920 kWh per kWp a year; on-site use is 75% for the 50 kW row (a daytime-only building) and 90% for larger 24/7 sites; exported electricity is valued at nil. No operating cost, inverter replacement, degradation, grant or tax effect is included.
A worked example: 500 kW on a 24/7 site
Take a 500 kW rooftop array at £900 per kW, so £450,000 installed. At about 920 kWh per kWp a year it generates roughly 460,000 kWh. If 90% is used on site, the saving depends on the unit price the site would otherwise pay:
- At 15p per kWh avoided: about £62,100 a year saved, simple payback about 7.2 years.
- At 20p per kWh avoided: about £82,800 a year saved, simple payback about 5.4 years.
- At 25p per kWh avoided: about £103,500 a year saved, simple payback about 4.3 years.
The arithmetic is deliberately plain. It shows why a trust buying power at the top of its range gets a much shorter payback than one on a fixed low-price contract, and why the half-hourly data matters more than any benchmark on this page.
What moves the price
Roof construction is the biggest variable. Modern flat-roofed community hospitals with clean membrane roofs tend towards the low end of a range; older estates needing structural reinforcement, asbestos surveys or heavily serviced roofs tend towards the top. Electrical integration is second: a site with spare capacity on modern low-voltage infrastructure connects cheaply, while one needing switchgear work or long cable runs to plant rooms carries significant additions. Access and programme matter more in healthcare than elsewhere: scaffolding over live entrances, crane lifts scheduled around helipads and infection-control segregation all cost programme time. The healthcare compliance layer (HTM 03-01 planning, Enhanced DBS access for patient areas, Authorising Engineer review under HTM 06-01) adds cost, and a quote that omits it is pricing a different job. Generation above 16 A per phase (about 3.68 kW on a single phase) needs a G99 application and DNO approval before connection; smaller systems use the G98 connect-and-notify route (ENA EREC G98/G99).
Self-consumption is the lever
A 24/7 clinical baseload means most of what an array generates displaces electricity bought at the full import price instead of being exported for a fraction of it. Daytime-only health centres and practices (see GP surgeries and dental and medical practices) still perform well because their demand tracks the sun, but the on-site share is lower, which is why the table above uses 75% for them. The only way to replace an assumption with a number is twelve months of half-hourly meter data for the site.
How funding changes the picture
For NHS trusts the headline cost is not always what the trust pays, but the funding position has moved. PSDS Phase 4 took applications from 9 October to 25 November 2024 and is now closed to new applications; awards already made continue to be delivered (gov.uk scheme page). No Great British Energy NHS solar application window is open now. The rounds so far in the Great British Energy NHS solar programme run with NHS England: £100 million in a first round announced in March 2025 (NHS England), an extension in 2025, and a further £25 million for 2026/27 whose application window closed on 22 June 2026 (HEFMA). Ask your regional Greener NHS lead where the programme stands. See the funding page for how the routes compare, and the article on UK hospitals with solar for how the programmes fit together.
Private hospital groups and practices work differently: they should expect to pay VAT at the standard rate on a commercial installation (the temporary zero rate in VAT Notice 708/6 covers qualifying homes and buildings used solely for a relevant charitable purpose, not commercial healthcare premises; confirm your own position with your accountant), and they can set the spend against tax. Solar is special-rate plant, so the Annual Investment Allowance (up to £1 million) usually gives 100% relief in year one for a business under the limit, with a 50% first-year allowance for companies above it (HMRC HS252). The private hospitals page covers the structures.
Battery storage adds cost per kWh of usable capacity on top of the figures here. It is an economic add-on for demand management and flexibility rather than a replacement for generator capacity, a distinction covered on the energy resilience page.
Cross-checking against published data
There is no published cost benchmark for hospital-scale rooftop solar. DESNZ publishes solar PV cost data for MCS-certified installations, but it is dominated by small systems and mixes domestic and non-domestic installs, so it does not benchmark the sizes on this page. Treat every figure here as a planning range to test against a surveyed quote.
Questions to put to a bidder about cost
- What is the price per kW, and what does it include (scaffold or access, structural work, G99 application and any DNO works, commissioning, monitoring)?
- Which provisional sums are in the price, and what roof surveys back the fixed elements?
- Does the price include HTM 06-01 design review by an Authorising Engineer (Electrical), HTM 03-01 infection-control planning and Enhanced DBS arrangements for patient areas?
- What yield figure is the price based on, and can the PVSyst file be checked by a third party?
- What does operation and maintenance cost per year, and when is inverter replacement expected?
Getting a real number
Benchmark tables end where roof drawings begin. A surveyed quote or desk feasibility models the actual half-hourly consumption against the actual roof area and returns a system size, an installed cost, a yield model that can be checked, and the funding route. That is the document a business case or board paper needs; the hospital solar cost guide explains how to read a quote line by line. If you want to talk through what a feasibility should contain for your estate, send an enquiry and we reply by email; the procurement guide explains how to buy the work. For the wider picture, see the guide to solar panels for hospitals.
Cost questions
How long is the payback on solar for a 24/7 hospital site?
On this page's assumptions a 24/7 site using 90% of its output on site pays back in roughly 4 to 7 years at 25p to 15p per kWh avoided, before any grant. The price paid for electricity moves the answer more than the cost of the array.
Why does a GP surgery pay back more slowly than an acute hospital?
A surgery is a daytime-only building, so less of the output is used on site (75% here against 90%), and small systems cost more per kW. Both lengthen the payback; the table shows roughly 6 to 11 years for 20 to 80 kW.
What is usually left out of a hospital solar price?
Check for access and scaffolding, structural work, asbestos surveys, switchgear or cable work, the G99 application and any network works, healthcare compliance (HTM 06-01 review, infection-control planning, Enhanced DBS arrangements), monitoring and operation and maintenance.
When does a hospital solar scheme need a G99 application?
Generation above 16 A per phase (about 3.68 kW on a single phase) needs a G99 application and network operator approval before connection; smaller systems use G98 connect-and-notify (ENA EREC G98/G99). Every hospital array on this page exceeds that.