School energy budgets have been under sustained pressure for the better part of a decade. Electricity costs that were manageable ten years ago now represent a significant line in budgets that haven’t grown proportionately. A solar PPA doesn’t solve every financial challenge a school faces, but it does something that most budget interventions can’t: it locks a meaningful portion of electricity spend at a fixed rate that sits materially below the grid, for 20 years, with no capital outlay required to get there.
This article brings to life what that looks like for a typical secondary school or academy, and why the long-term picture is considerably stronger than the year one figures suggest.
The full mechanics of how the model works, from desktop assessment through to installation and long-term performance monitoring, are covered in our guide Fully Funded Solar for Schools – How UrbanVolt’s Model Works.
What 30-40% below grid means
UrbanVolt prices its solar PPA at least 30-40% below the client’s current grid rate, fixed for the full 20-year term. On a school consuming 300,000 kWh annually, with solar covering 40% of that consumption – 120,000 kWh per year – a current grid rate of 25p per kWh, and a PPA rate of 15p per kWh, the saving on the solar portion in year one is approximately £12,000.
That’s a useful starting figure, but it’s also likely the smallest annual saving the school will ever see from the agreement.
What happens to that saving over time
UK electricity prices have risen at over 5% per annum on average in recent years, and it’s unlikely that this trajectory will reverse. The PPA rate, by contrast, is fixed from day one.
The practical effect of that combination is a saving that grows every year without any further action from the school.
So, on the same site, applying 5% annual grid inflation over a 20-year term:
By year five, the annual saving has grown to approximately £17,000. By year ten, it’s £27,000 – more than double the year one figure. By year fifteen, £40,000. By year twenty, £56,000.
Over the full 20-year term, the total saving against projected grid costs is approximately £600,000 for a school of this profile.
This is what compound grid inflation produces when set against a rate that doesn’t move. Every year the school remains on the grid at market rates for that portion of its electricity, it pays more. Every year it consumes solar at the fixed PPA rate, the gap between the two will likely widen further in its favour.
What it means for budget planning
The immediate value of funded solar is a reduction in electricity cost from day one. The longer-term value is certainty. A school that has fixed 40% of its electricity consumption at a known rate for 20 years has removed that portion of spend from the volatility that makes energy budgeting difficult. When grid prices spike, the impact on the school’s budget is proportionally smaller than it would otherwise be.
For schools managing multiple sites, or trusts planning energy strategy across an estate, that certainty compounds. Each site brought under a PPA framework adds another tranche of consumption insulated from grid price movements.
The numbers specific to your school
The figures above are illustrative. The actual saving on any given school depends on total electricity consumption, the proportion the solar system covers, and the current grid tariff – all of which vary by site.
UrbanVolt produces a desktop savings assessment from a school’s electricity bill and 12 months of half-hourly data. The output is a site-specific proposal: year one saving, cumulative saving over the contract term, and carbon reduction figures that can feed directly into sustainability reporting. It’s the document that makes the financial case specific rather than illustrative – and it’s available well before any commitment is required.
Interested in getting started? Take a look at our school page and register your interest.