Solar for halls where the operator pays the bills

In most purpose built student accommodation the rent is inclusive, so the resident has no incentive to switch anything off and no bill to react to. The operator carries the entire cost and absorbs every price rise inside a rent that was set months earlier.

That makes energy a direct margin item rather than a recharged cost. Every unit an array displaces is a unit the operator does not buy, valued at the full import rate rather than at an export rate. In sectors where bills are passed through, solar has to be structured around who benefits. Here it does not.

It also means the metering question, which usually complicates landlord and tenant schemes, is largely absent. The landlord supply is the bill, so the array simply reduces it.

Bedroom consumption is spiky and largely evening weighted. The landlord supply is not. Corridor and stair lighting, lifts, mechanical ventilation, hot water circulation pumps, laundry, communal kitchens, study spaces, reception, access control and CCTV run more or less continuously, all year.

That flat base load is what an array pays against, and it is why halls tend to show better self consumption than an office of similar size. Laundry in particular is worth mapping, because it is a large controllable load that can often be nudged towards the middle of the day.

Where heating and hot water are electric, or have moved to heat pumps, the daytime base load rises again and the array a building can usefully absorb grows with it.

Occupancy is high and stable from autumn through to early summer, then falls away. Some buildings sit close to empty for two or three months, which is precisely when generation peaks. That is the same structural problem schools face, though it bites less here because the communal base load does not stop when the residents leave.

Buildings that take conference lettings, summer schools or language school groups do noticeably better, and those lettings belong in the model rather than being treated as a bonus. Where a building genuinely empties, sizing closer to the year round base load produces a better return than filling the roof.

The summer changeover is also the obvious delivery window. Access is easiest, the roof is not above sleeping residents, and the electrical connection can be scheduled without affecting anyone.

Modern purpose built schemes are often tall with a small roof plate relative to floor area, and much of that plate is occupied by lift overruns, ventilation plant, safety zones and sometimes amenity terraces. Usable area can be a fraction of the plan area, which is why an outline drawn around the genuinely clear space gives a far more useful estimate than a gross measurement.

Older converted halls have more roof relative to load, but frequently more constraints too, including pitched slate, listed status in university cores, and roof coverings near the end of their life.

Where roof area is short, canopies over bin stores, cycle parking or car parking can add generation, and they suit sites that also want charge points for staff and visitors.

Most operators hold several buildings. The sensible sequence is to screen the portfolio on roof condition, communal consumption, remaining lease or freehold status and network constraint, then build the strongest two or three first and standardise equipment and monitoring across everything that follows.

NRG Solar does not install. We assess the site, produce indicative figures from your own communal spend and roof outline, and match you with one vetted installer in the network that works in your region and has delivered residential scale schemes before.

Our service is free to you and the installer pays us if a project proceeds, which is why we will tell you when a building is not worth doing.