NHS energy bills have nearly doubled since 2019, and hospitals across the country are feeling the squeeze. East Surrey Hospital is doing something about it — and the numbers behind this project are genuinely impressive.
- East Surrey Hospital is installing 2,827 solar panels on its rooftops in Redhill, Surrey, with completion expected by spring 2026.
- The project is funded by a £1.6 million grant from Great British Energy as part of the government’s Local Power Plan.
- The trust expects to save over £6.5 million on energy bills over 25 years, while cutting 454 tonnes of CO₂ annually.
- 99% of the energy generated will be used on-site, offsetting around 13% of the hospital’s total electricity consumption.
East Surrey Hospital’s Rooftop Solar Project Is Already Underway
Work has begun at East Surrey Hospital in Redhill to install nearly 3,000 solar panels across the site’s rooftops. The project, run by Surrey and Sussex Healthcare NHS Trust (SASH), is targeting full operation by spring 2026.
The installation was made possible after the trust secured £1,615,224 in funding from Great British Energy back in March 2025. It was one of the first NHS sites selected under the government’s scheme to roll out rooftop solar across public sector buildings.
Patrick Blanche, SASH’s Director of Estates and Facilities, described the project as “another important step” in the trust’s commitment to the NHS net zero pledge, adding that it would serve as a reference point for future estate projects.
How Much Energy Will the Solar Panels Generate?
The trust estimates that the 2,827-panel system will offset approximately 13% of East Surrey Hospital’s total electrical energy consumption. That might sound modest on paper, but for a site that runs operating theatres, imaging equipment, lighting and climate control around the clock, it represents a meaningful reduction in grid dependence.
Here’s a snapshot of the projected impact:
| Metric | Projected Figure |
|---|---|
| Number of solar panels | 2,827 |
| On-site energy utilisation | 99% |
| Electricity consumption offset | ~13% |
| Annual CO₂ reduction | 454 tonnes |
| Equivalent trees planted (over 20 years) | 15,036 |
| Estimated lifetime savings (25 years) | £6.5 million+ |
Crucially, the trust says 99% of the electricity generated will be consumed directly by hospital infrastructure. That near-total on-site usage means very little surplus energy needs to be exported, maximising the financial benefit from every panel.
Part of a Much Bigger NHS Solar Rollout
East Surrey Hospital isn’t an isolated case. It’s part of Great British Energy’s wider programme to install rooftop solar panels across hundreds of public sector buildings — a scheme now worth up to £255 million in total.
The programme currently covers around 260 NHS sites, 250 schools and roughly 15 military installations across the country. In total, 132 solar projects at 78 NHS trusts in England have received funding, making it the first dedicated solar investment programme for the health service.
The NHS is the single biggest public sector energy user in the UK, with an estimated annual energy bill of around £1.34 billion. That figure has nearly doubled since 2019, driven largely by the UK’s exposure to volatile global fossil fuel prices.
Health Secretary Wes Streeting put it bluntly when the expanded scheme was announced: every pound the NHS spends on rising energy bills is money that cannot be spent on cutting waiting times.
Other NHS Hospitals Already Seeing Results
Several NHS trusts that moved earlier on solar are already proving the financial case. The results so far offer a useful benchmark for what East Surrey Hospital can expect once its system goes live.
Hull University Teaching Hospital installed 11,000 solar panels that were reportedly saving the trust around £230,000 per month during summer, generating over 4.2 million kilowatt-hours annually. Leeds Teaching Hospital’s 617-panel car park canopy at Wharfedale Hospital saved over £120,000 in electricity costs in its first year.
Meanwhile, the Royal Wolverhampton NHS Trust built a solar farm on a former landfill site that is expected to deliver between £15 million and £20 million in savings over the next two decades, powering the hospital with self-generated renewable energy for roughly 288 days a year.
These examples underline a clear pattern: NHS solar investments are paying for themselves rapidly, with savings being redirected straight back into patient care.
Why Hospital Rooftop Solar Makes So Much Sense
Hospitals are uniquely well-suited to rooftop solar for a few key reasons.
First, they have large, flat roof areas — often across multiple buildings — that are ideal for panel installation. Second, hospitals consume electricity continuously, day and night, which means solar generation during daylight hours is almost entirely used on-site rather than exported at lower rates.
Third, hospitals are among the most energy-intensive buildings in the country. A typical acute hospital can use 60–90 kWh of electricity per square metre annually, far more than a standard commercial building. Even a 13% offset, as projected at East Surrey, translates into substantial cost and carbon savings.
And with only around 10% of NHS hospitals currently fitted with solar panels, the headroom for further deployment across the estate is enormous.
What This Means for the NHS Net Zero Target
The NHS has committed to reaching net zero carbon emissions by 2040 for direct emissions and by 2045 for its wider supply chain footprint. Rooftop solar alone won’t get it there, but projects like East Surrey Hospital’s are building the foundation.
With energy costs eating into budgets that could otherwise fund frontline services, the financial argument has become just as compelling as the environmental one. Every kilowatt-hour generated on-site is one fewer purchased from the grid — and at current commercial electricity rates, those savings compound quickly.
For the 90% of NHS hospitals that don’t yet have solar panels, East Surrey’s project is another proof point that the technology works, the economics stack up, and the funding is available to make it happen.
If you’re interested in understanding how commercial solar panel costs break down for large installations like hospitals, or want to calculate the carbon footprint reduction from solar energy, these tools can help you see the real-world impact that projects like East Surrey Hospital’s are delivering.
