NHS Trusts

Why this sector

NHS trusts represent the largest single category of public-sector commercial solar opportunity in the UK. The estate combines vast roof area, continuous clinical demand for electricity, and an active decarbonisation mandate via NHS Net Zero. The technical and economic case is exceptionally strong: 90%+ self-consumption, predictable demand, robust covenant for any financing, and PSDS access for grant funding. The complications are governance and estate. Most trusts have 5–25+ buildings of mixed ownership (NHS-owned, NHS Property Services, Community Health Partnerships, private PFI), each with different decision-making and contracting routes. PFI buildings in particular are often constrained by PFI contracts that prevent third-party installations. We typically recommend trusts begin with the buildings they own outright, sequence other estate categories as PFI contracts wind down, and bundle solar with heat decarbonisation and battery resilience in PSDS applications. The integration of battery with hospital PV is increasingly attractive — batteries provide both peak-shaving for capacity charge reduction and resilience capability that supports clinical continuity in grid-failure scenarios.

Worked example

Pitfalls to watch

• Estate complexity — multiple buildings, mixed ownership, PFI considerations
• Roof access during clinical operations requires careful programme planning
• Asbestos prevalent in older estate — survey and management costs
• Resilience and clinical continuity priorities may favour battery alongside PV
• PFI building constraints can prevent installations on parts of the estate
• Procurement under PCR 2015 / NHS frameworks adds complexity
• ICS-level governance may require coordination across multiple trusts

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