Solar for schools with a term time load pattern

A school consumes on around one hundred and ninety weekday mornings and afternoons a year and very little the rest of the time. Lighting, IT, catering, ventilation and heating controls run from early morning to late afternoon, then the building empties. Weekends are close to base load, and the long holidays are close to nothing.

That gives a good hourly match during term. The problem is the calendar rather than the clock. Six weeks of the highest generation in the year land in the emptiest weeks of the year, and that single fact governs how a school array should be sized.

Sizing to fill the roof produces a large export figure and a disappointing payback. Sizing closer to the term time base load produces a smaller array that pays back faster. The assessment on this site uses your own consumption to show the split rather than assuming a school average.

There are three honest responses and they are often combined. The first is to size against term time consumption and accept modest summer export at the export rate. The second is to lift summer consumption, through holiday clubs, community lettings, sports facility hire or summer schools, which many trusts already run and which meaningfully improves the numbers.

The third is storage, which shifts generation into evenings and can capture some weekend value. It rarely rescues a poorly sized array, because a battery that fills every day and then sits idle through August is expensive capacity. Whether it pays should come from half hourly data, not from a rule of thumb.

What we would not do is pretend the summer is not a problem. It is the single biggest reason a school array underperforms against an over optimistic proposal.

The school estate is unusually varied. Victorian board schools with steep slate roofs, post war system built blocks, temporary classrooms that were meant to be temporary decades ago, and modern academy buildings with large simple roofs all sit within the same trust.

System built blocks from the nineteen sixties and seventies frequently have limited structural headroom and roof coverings near the end of their life, and asbestos containing materials are common across buildings of that era. Neither is an automatic blocker, but both belong in the feasibility stage rather than being discovered when scaffolding is already up.

Sports halls, dining halls and newer teaching blocks usually carry the array. Where roof life is short, aligning solar with a planned recovering scheme avoids paying twice to lift the same panels.

The business case is rarely the obstacle. Capital is. Schools and trusts commonly look at trust capital reserves, condition and improvement funding bids, public sector loan arrangements repaid from the saving, and third party funded models where a provider owns the array and the school buys the electricity.

Third party models remove the capital requirement but tie the school into a long agreement, and the terms need reading properly, particularly around price escalation, end of term arrangements and what happens if the school needs roof works. We explain the trade off rather than steering you towards one route.

Funding programmes and their criteria change from year to year, so confirm what is currently open with your local authority or trust finance team rather than planning against a scheme name you saw in an old proposal.

Almost all school installations are programmed into the summer break, which is why the summer contractor diary fills early. Where work has to happen in term time, it requires segregated compounds, separate access and delivery routes, safeguarding clearance for everyone on site and careful control of noise near examinations.

Multi academy trusts get better results treating this as a portfolio. Screen every school on roof condition, consumption and structure, deliver the strongest first, and standardise equipment and monitoring so the estates team is not maintaining eight different systems.

The teaching angle is real and worth asking for. Monitoring platforms provide classroom displays of live generation and cumulative carbon avoided, which schools use across science, geography and mathematics. NRG Solar does not install. We assess your school, produce indicative figures and match you with one vetted installer that has worked in education settings.