Commercial solar for leisure.

Leisure centres, gyms and swimming pools are among the most energy-intensive public buildings in operation. Pool circulation pumps, pool-hall ventilation and dehumidification, air handling across the gym floor, lighting and hot water all run for long, predictable hours, and most of that demand falls in daylight. That is the load shape that makes commercial solar worth modelling for a leisure operator.

Whether the site is a council-run leisure centre, a trust-operated pool, a private health-and-fitness club or a sports ground with a clubhouse and stand, the question is the same. When is the electricity actually used, and how much of the generation lands on site rather than going to the grid for a fraction of the import price. For a building that runs hard from early morning to late evening, that match tends to be a strong one.

Solar pays best when the generation is consumed on site. Every unit used offsets an expensive import unit, while every unit exported is paid far less, so the return tracks how well the array lines up with the building's demand through the day. That balance between self-consumption and export is the figure that decides whether a leisure scheme stacks up. Leisure sites read well against that test. Pool plant is close to a continuous base load: circulation and filtration pumps run around the clock, and the ventilation and dehumidification that keep a pool hall usable run with them. Layer on the gym's air handling, the lighting and the hot-water draw across a long trading day, and the daytime demand stays high and steady. A high share of generation tends to be self-consumed rather than exported.

The seasons help too. A pool building's plant load runs all year, so winter generation is still put to work, and the long summer opening hours sit right under the part of the year when the array produces most. Where a site runs reduced hours, closes a pool for maintenance or has a demand that drops away in the evening, we say so plainly, and we look at whether battery storage shifts generation into the evening peak or whether an estate-wide approach across several sites improves the overall match. A council or trust running a portfolio alongside its other buildings can read this against the wider public-sector estate, and a seasonal site sits closer to the holiday-park profile than to a year-round centre. The honest split between self-consumption and export comes from modelling the real load, not a sector average.

Leisure buildings tend to offer broad, low-pitch or flat roofs over the pool hall, sports halls and gym floor, often with plant rooms and rooftop air-handling units to design around. For orientation only, leisure sites in this region sit in an indicative band of roughly 50–250 kWp per site, covering leisure centres, gyms and pools, which puts most centres in the 50–250 kWp system-size range rather than the megawatt bracket. Treat that as a sense of scale rather than a quote. The real figure comes from the on-site survey and the half-hourly load model, which sizes the array to the demand the building actually carries rather than to the roof area alone. It sits alongside the other buildings we cover across commercial sectors, and the survey-led method behind every figure is set out in our process.

Statutory and structural duties shape a leisure scheme as much as the load does. A council or trust leisure estate is a non-domestic let or operated building, so its energy performance is already on the regulatory clock. The Minimum Energy Efficiency Standard requires a non-domestic property to reach a defined EPC band to be lawfully let, and the trajectory tightens through the decade, which we set out in our guide to MEES and EPC for commercial solar. On-site generation does not change a building's fabric rating on its own, but it sits inside the same estate decarbonisation case a leisure operator is already building, and a trust running several centres can weigh the array against that wider obligation rather than treating it as a stand-alone purchase.

The structural question is sharper on a pool building than on most commercial roofs. A pool hall is a warm, humid, chemically aggressive environment, and its roof is frequently a built-up flat or shallow membrane deck carrying its own moisture management and a finite remaining service life. Loading an array onto that deck is a structural and waterproofing decision before it is an electrical one, so we commission a structural roof survey and read the covering age against the 25-year-plus design life of the panels. Where the roof is near the end of its life we say so, and the honest answer is sometimes to recover the roof first rather than fix an array to a deck that will need stripping inside the system's lifetime. The non-MCS engineering stack that governs the install, BS 7671, IEC 62446-1 commissioning and an RC62 certificate, sits on top of that structural read, not instead of it.

The same humid, chlorinated atmosphere that tests the roof also reaches the mounting hardware, so on a pool building we specify fixings and frames rated for that corrosion exposure rather than a standard rooftop kit, and we keep the array clear of the warm, moist plumes that vent from pool-hall dehumidification and AHU discharge. None of this is generic solar detailing; it is what a wet leisure roof demands if the system is to hold its design life.

The funding route is a real decision for a public or trust buyer, and it changes the case. A leisure centre rarely sits on a balance sheet with spare capital, so the way the system is paid for often matters as much as the engineering. A direct capital purchase keeps the full saving and the export revenue with the operator and suits a council with grant or prudential-borrowing headroom; a lease or a power purchase agreement moves the upfront cost off the operating budget and pays for the system out of the avoided import instead. We do not push one route, and we do not put a payback figure on this page, because the answer depends on your cost of capital and your tax position. What we do is model the self-consumption first, then set the costed business case out against whichever route fits the balance sheet. The full comparison of capital, lease and PPA structures, and the allowances that apply to a commercial array, is laid out across our commercial finance pages, and the method set out in ROI and payback; the figures there are modelled illustrations to be confirmed against your own numbers and your accountant's advice, not a promise.

Two operational realities feed back into that case. First, a leisure centre that adds battery storage can carry daytime generation into the evening swim and gym peak, which lifts the self-consumed share the finance model runs on, so storage is sized against the same half-hourly profile rather than bolted on. Second, the connection itself has a cost and a calendar: a system above the smaller G98 threshold needs a G99 application to your network operator, which across Yorkshire and northern Lincolnshire is Northern Powergrid, and any export limit agreed there caps what the site can sell back, which is why the connection is designed alongside the array and not after it. We carry the whole of that, the survey, the modelling, the structural read and the connection, through one method, which is set out in full in our process.

For a trust or council running several centres, the funding decision is also a sequencing one. Not every roof earns at the same rate, and a strong year-round pool building will model a better self-consumed share than a seasonal site or a dry sports hall, so the programme leads with the centres that pay first and phases the weaker roofs behind them. That estate view sits alongside the wider public-sector estate case, where the same building-by-building modelling decides the order of works rather than a blanket roll-out across every site at once.

A leisure estate often carries sporting structures that a pool block does not, and they change where an array can physically go. A grandstand roof is frequently a long cantilevered or lightweight span built to shelter a crowd rather than to carry a distributed load, so whether it can take panels and any ballast is a structural question the survey has to answer before a layout is fixed. Floodlight pylons, masts, scoreboards and the open bowl of a ground all throw shading that moves through the day and across the season, and a plan-view estimate misses it. The 3D drone survey records those obstructions as built, which is why the PV*SOL model starts from real geometry rather than a roof outline.

The load reads differently from a year-round pool too. Evening floodlit fixtures and weekend match-day surges fall largely outside generation hours, so they self-consume little. The value sits in the everyday base load of clubhouse lighting and heating, a members' gym, kitchens and bar refrigeration, changing-room hot water and pitch or pool pumps that runs through the working day, so a site that trades and trains through the week self-consumes a more useful share than one used only on match days. Where the daytime match is genuinely weak we say so, and we look at whether battery storage shifts midday generation into the evening floodlight peak. The works are then sequenced around the fixture list, groundworks and crowd access, under CDM 2015 with an appointed Principal Designer and Principal Contractor, because access over occupied stands and a playing surface is planned around when the site is genuinely available rather than dropped on top of it.