Solar for Hotel and Leisure Centre Pools

The load profile that makes finance directors listen

A commercial indoor pool runs long hours all year: water held at 28–30°C, hall air a degree or two warmer, dehumidification and ventilation plant cycling continuously, and circulation and treatment pumps that never rest. No published benchmark covers hotel pools on their own, so the figures here come from UK guidance. The Government-backed energy guide ECG078 (2001) puts a typical 25m pool centre at about 237kWh of electricity and 1,336kWh of gas per square metre of floor area a year, roughly 85% of it heat, and a good-practice centre at about 152 and 573. The Carbon Trust's later guide calls those benchmarks a little dated but says a pool hall uses about five times as much energy per square metre as an office, and that in a hotel the pool alone can account for as much as 10% of total energy costs. Two properties of this load matter for solar. It is constant, so on-site generation is largely used on site rather than exported at a fraction of the import price; and it is daytime-weighted, peaking when a rooftop array peaks. Model both with twelve months of half-hourly data rather than assuming a self-consumption figure.

Where the energy goes in a pool hall

Photovoltaic panels make electricity, and about three-quarters of a pool hall's energy is heat. That is why plant comes before panels: the array serves the 22% that is electrical directly, and the heat only through a heat pump or electric boilers. Water-treatment electricity can be as much as half of a pool's electricity use, according to the same Sport England guidance, which is another reason variable-speed pumps are the first electrical saving.

Sizing and siting at commercial scale

Hotel and leisure buildings often carry flat roofs large enough for a ballasted array, sized in practice by roof area, structure and supply headroom rather than by demand, because a pool building absorbs what the roof can make. PVGIS gives about 947kWh per kWp a year for a south-facing 35° array in Leeds and 1,052 in Exeter, so a 100kWp array on that basis produces roughly 95,000–105,000kWh a year; east-west flat-roof layouts yield less per kWp but fit more panels per square metre. We have withdrawn the £750–£950 per kWp price this page used to carry. DESNZ publishes installed-cost bands only up to 50kW (the only 10–50kW figure we hold is a Welsh mean of £1,257 per kW) and we found no published GB band above that, so get quotes on your own roof. On connection, an array above about 16A per phase (3.68kW single-phase, about 11kW three-phase) needs a G99 application and DNO approval before it is connected; below that it is "connect and notify" under G98. Structural sign-off is standard survey work. Operators with car parks can extend with solar canopies once the roof saturates.

The money: allowances and rates, not VAT

The zero rate of VAT on energy-saving materials applies to installations in residential accommodation, and HMRC's notice lists hotels among the premises where the standard rate applies, so a hotel or leisure operator should expect to be charged VAT on the installation and reclaim it through the normal return if VAT-registered: cost-neutral rather than a saving. The real levers are tax. Solar is special-rate plant for capital allowances; the £1m Annual Investment Allowance usually gives a business under the limit 100% relief in year one, spending above the limit can claim a 50% first-year allowance on special-rate plant, and "full expensing" does not cover solar. At the 25% main rate of corporation tax, year-one relief is worth up to 25p in the pound, less for smaller profits. In England, onsite renewable generation plant and storage is left out of business-rates valuation until 31 March 2035, so the array does not raise the rateable value of the pool building. Add the ESG line: a quantified Scope 2 reduction for the sustainability report.

Sequencing for operators

The plant-room rules from domestic pools scale up: heat-recovery dehumidification before panels; pool covers on every tank overnight, which the Carbon Trust reports cutting total pool energy use by 10–30% with an 18-month to three-year payback; variable-speed pumps throughout, where US research puts the saving at 50–90% depending on settings — the efficiency page applies at every scale. Then size the array against the trimmed load. Multi-site operators should pilot on the flagship and template the rest, because the survey, supplier and paperwork costs amortise across an estate. For the underlying technology choices, the heat pump pairing and indoor pool design pages cover the engineering, and the costs page sets out what we can and cannot source on commercial pricing.

What to put on the table before anyone sizes an array

• Twelve months of half-hourly consumption data from your supplier or meter operator, or at least a year of bills.
• Roof drawings, the age and condition of the roof, and any structural report (or permission to commission one).
• The pool plant schedule: heat source, dehumidification and heat-recovery plant, pump types and ages.
• Opening hours, and any plant replacement already planned.
• The lease and the landlord's position if you do not own the roof; listed or conservation status.
• The connection position with your distribution network operator, because anything above G98 limits needs a G99 application.

Funding position on 20 October 2026

Public and trust-run pools have relied on grant windows that open and close, so check the live position before building a business case on one. Sport England's Swimming Pool Support Fund in England is closed: both phases are closed to submissions, after more than 300 facilities were funded. Salix said on 12 June 2025 that there is no further Public Sector Decarbonisation Scheme investment beyond currently awarded projects, with delivery running to 31 March 2028. In Scotland, Salix announced a third phase of the Public Sector Heat Decarbonisation Fund in March 2026, which we believe has since closed. We did not check Wales or Northern Ireland. Commercially operated centres have no grant route we could find, which is why the tax treatment above matters. When you are ready for site-specific numbers, the contact form below reaches us and we reply by email.