£100,000+ in Savings & It Could Cost You Nothing
Schools are ideal candidates for solar panels. Large flat roofs, high daytime electricity use that matches solar generation, tight budgets that benefit from reduced energy bills, and an educational mission that aligns perfectly with renewable energy — it’s a combination that makes solar an obvious choice.
Better still, schools have access to funding streams that most organisations don’t. From interest-free Salix loans to Condition Improvement Fund grants, free solar through Power Purchase Agreements, and local authority schemes, there are multiple ways to install solar with little or no upfront cost.
This guide covers everything schools need to know — system sizes, costs, funding options, savings, educational benefits, and how to navigate the process from initial interest to generating clean electricity.
Why Schools Are Perfect for Solar
The alignment between solar generation and school energy use is remarkably good:
| Factor | Why It Helps |
|---|---|
| Daytime operation | Schools operate 8am-4pm when solar generates most — high self-consumption rates of 60-85% |
| Large roof areas | School buildings typically have extensive flat roofs ideal for solar arrays |
| High electricity use | Lighting, IT suites, kitchens, heating systems — schools use significant electricity during peak solar hours |
| Term-time alignment | Highest electricity use (term time) coincides with highest solar generation (spring/summer terms) |
| Long-term occupation | Schools don’t move — 25-30 year solar lifespan matches institutional permanence |
| Educational value | Living demonstration of renewable energy for students |
| Community visibility | Demonstrates environmental leadership to parents and local community |
| Budget pressures | Energy savings can be redirected to educational resources |
Solar for Schools at a Glance
| Typical system size | 30-100kW (primary), 50-200kW (secondary) |
| Cost range | £20,000-£150,000 |
| Cost per kW | £800-£1,100 installed |
| Annual savings | £5,000-£30,000 depending on size |
| Payback period | 7-12 years (self-funded), 0 years (grant/PPA funded) |
| Self-consumption rate | 60-85% (term time), 20-40% (holidays) |
| CO₂ savings | 10-50+ tonnes per year |
| Lifespan | 25-30 years |
| Funding options | Salix, CIF, DEC, local authority, PPA, crowdfunding |
System Sizes and Costs by School Type
Primary Schools
| Typical electricity use | 40,000-80,000 kWh/year |
| Recommended system size | 20-50kW |
| Roof area needed | 100-300m² |
| Number of panels | 45-120 |
| Installed cost | £18,000-£50,000 |
| Annual generation | 17,000-42,500 kWh |
| Annual savings | £4,000-£12,000 |
| Payback (self-funded) | 5-8 years |
Secondary Schools
| Typical electricity use | 150,000-400,000 kWh/year |
| Recommended system size | 50-150kW |
| Roof area needed | 250-900m² |
| Number of panels | 120-360 |
| Installed cost | £45,000-£135,000 |
| Annual generation | 42,500-127,500 kWh |
| Annual savings | £10,000-£35,000 |
| Payback (self-funded) | 5-8 years |
Special Schools and PRUs
| Typical electricity use | 30,000-100,000 kWh/year |
| Recommended system size | 15-60kW |
| Installed cost | £14,000-£55,000 |
| Annual savings | £3,000-£15,000 |
Multi-Academy Trusts (MATs)
MATs can achieve significant economies of scale by procuring solar across multiple schools simultaneously:
| Portfolio approach | Install across 5-20+ schools in a single procurement |
| Cost reduction | 10-20% lower per-kW cost through bulk buying |
| Combined capacity | 500kW-2MW+ across the trust |
| Annual savings | £50,000-£300,000+ across the trust |
| Strategic benefit | Demonstrates trust-wide environmental commitment |
Detailed Cost Breakdown
Here’s what a typical 50kW school installation includes:
| Component | Cost |
|---|---|
| Solar panels (120 x 420W) | £12,000-£16,000 |
| Inverter(s) | £3,500-£5,500 |
| Mounting system (flat roof ballasted) | £5,000-£8,000 |
| Cabling, switchgear, metering | £2,500-£4,000 |
| Installation labour | £8,000-£12,000 |
| Scaffolding/access equipment | £1,500-£3,000 |
| DNO application and connection | £500-£2,000 |
| Structural survey | £400-£800 |
| Design and project management | £1,500-£3,000 |
| Educational display (optional) | £500-£2,000 |
| Total | £35,000-£56,000 |
Cost per kW by System Size
| System Size | Cost per kW | Total Cost |
|---|---|---|
| 20kW | £950-£1,200 | £19,000-£24,000 |
| 30kW | £900-£1,100 | £27,000-£33,000 |
| 50kW | £850-£1,050 | £42,500-£52,500 |
| 75kW | £820-£1,000 | £61,500-£75,000 |
| 100kW | £800-£950 | £80,000-£95,000 |
| 150kW | £780-£920 | £117,000-£138,000 |
| 200kW+ | £750-£900 | £150,000+ |
Larger systems benefit from economies of scale — the cost per kW drops as system size increases.
Funding Options for Schools
Schools have access to more funding routes than almost any other sector. Here are the main options:
1. Salix Finance (Interest-Free Loans)
| What it is | Government-backed interest-free loans for public sector energy efficiency |
| Available to | State-funded schools in England (academies, maintained schools, free schools) |
| Loan amount | £5,000 upwards — no upper limit |
| Repayment | From energy savings over 8-12 years |
| Interest rate | 0% — completely interest-free |
| Effect on budget | Cash-neutral — savings cover repayments, then savings continue for 15+ years |
| Website | salixfinance.co.uk |
Salix is the most popular funding route for school solar. The loan is repaid from energy savings, meaning the school’s budget isn’t affected during the repayment period — and after repayment, all savings go directly to the school.
How Salix Works
- School applies with project details and estimated savings
- Salix assesses the project (must meet payback criteria)
- If approved, school procures the installation
- Salix pays the installer directly
- School repays from energy savings over the loan term
- After repayment, school keeps all future savings (15-20+ years)
2. Condition Improvement Fund (CIF)
| What it is | DfE grant funding for school building improvements |
| Available to | Academies, sixth-form colleges, VA schools in England |
| Grant amount | £20,000-£4 million (larger projects) |
| Contribution required | Typically 10-20% school contribution |
| Application | Annual bidding round (usually autumn) |
| Criteria | Must address condition need or health & safety; energy efficiency considered |
Solar panels are rarely funded as standalone CIF projects, but they can be included as part of larger roof replacement or building improvement bids. If your school needs roof work anyway, adding solar to the project makes excellent sense.
3. Devolved Formula Capital (DFC)
| What it is | Annual capital allocation for schools to spend on priorities |
| Available to | All state-funded schools |
| Typical amount | £4,000-£25,000 per year depending on school size |
| Use for solar | Can accumulate over 2-3 years for a solar project |
4. Local Authority Schemes
Many local authorities run energy efficiency programmes for schools in their area:
- Council-funded installations: Some LAs fund solar for maintained schools directly
- RE:FIT and similar frameworks: Council-arranged procurement frameworks with pre-approved suppliers
- Green energy funds: LA-specific grant schemes
- Climate emergency funding: Many councils have allocated funds for decarbonisation
Contact your local authority’s energy or sustainability team to ask about available schemes.
5. Power Purchase Agreements (PPAs) — Free Solar
| What it is | Third party installs solar at no cost; school buys electricity at discounted rate |
| Upfront cost to school | £0 |
| Who owns the system | PPA provider (not the school) |
| Electricity price | 10-20% below grid rate, fixed or inflation-linked |
| Contract length | 15-25 years |
| Savings | Lower than self-funded, but still meaningful (£1,000-£5,000/year typical) |
| At contract end | System typically transfers to school ownership |
PPAs are attractive for schools that cannot access capital or loans. The trade-off is that savings are lower because the PPA provider keeps most of the financial benefit in exchange for taking all the risk and cost.
Key PPA Providers for Schools
- Solarplicity Schools
- ENGIE
- British Gas / Centrica
- mypower (specifically for schools)
- Local authority-arranged PPAs
6. Community and Crowdfunding
| What it is | Local community or parents fund the installation |
| Models | Community share offer, PTA fundraising, local business sponsorship |
| Benefit | Engages community, creates ownership, raises school profile |
| Organisations to help | Energy4All, Sharenergy, 10:10 Climate Action (Solar Schools) |
Community energy schemes allow parents and local residents to invest in the school’s solar system, receiving a modest return while enabling the installation. This model builds community engagement and makes the project a collective achievement.
7. Capital Budget / Reserves
If your school has accumulated reserves or capital budget, self-funding solar delivers the highest long-term returns:
- No loan repayments or PPA fees — 100% of savings retained from day one
- 7-10 year payback, then 15-20+ years of pure savings
- Best option if capital is available
Funding Comparison
| Funding Route | Upfront Cost | Annual Savings (50kW) | Total 25-Year Benefit |
|---|---|---|---|
| Self-funded | £45,000 | £12,000 | £255,000 (after payback) |
| Salix loan | £0 | £0 during repayment, then £12,000 | £180,000+ (after loan) |
| PPA (free install) | £0 | £2,000-£4,000 | £50,000-£100,000 |
Annual Savings and Payback
How Savings Are Calculated
School solar savings come from three sources:
- Avoided electricity purchases: Solar electricity used on-site replaces grid electricity at 25-35p/kWh. This is the main saving.
- Export income: Surplus electricity (holidays, weekends, low-use periods) can be exported under the Smart Export Guarantee at 4-15p/kWh.
- Avoided demand charges: Some commercial electricity contracts include capacity charges that can be reduced with on-site generation.
Self-Consumption Rates
Schools have excellent self-consumption because operating hours align with solar generation:
| Period | Typical Self-Consumption |
|---|---|
| Term time weekdays | 75-90% |
| Term time weekends | 30-50% (some baseload: fridges, servers, security) |
| School holidays | 20-40% (baseload only) |
| Annual average | 60-75% |
Worked Example: 50kW System on Secondary School
| System size | 50kW |
| Annual generation | 42,500 kWh |
| Self-consumption (70%) | 29,750 kWh used on-site |
| Export (30%) | 12,750 kWh exported |
| Electricity rate | 28p/kWh |
| Export rate (SEG) | 8p/kWh |
| Avoided purchase savings | 29,750 × £0.28 = £8,330 |
| Export income | 12,750 × £0.08 = £1,020 |
| Total annual benefit | £9,350 |
| System cost | £45,000 |
| Simple payback | 4.8 years |
| 25-year savings | £230,000+ |
Savings by System Size
| System Size | Annual Generation | Annual Savings | 25-Year Savings |
|---|---|---|---|
| 20kW | 17,000 kWh | £3,500-£4,500 | £85,000-£110,000 |
| 30kW | 25,500 kWh | £5,200-£6,800 | £130,000-£170,000 |
| 50kW | 42,500 kWh | £8,500-£11,500 | £210,000-£290,000 |
| 75kW | 63,750 kWh | £12,500-£17,000 | £310,000-£425,000 |
| 100kW | 85,000 kWh | £16,500-£22,500 | £410,000-£560,000 |
| 150kW | 127,500 kWh | £24,000-£33,000 | £600,000-£825,000 |
25-year savings assume 3% annual electricity price inflation and account for inverter replacement.
Educational Benefits
Beyond the financial case, solar installations offer significant educational value:
Curriculum Links
| Subject | Learning Opportunities |
|---|---|
| Science | Renewable energy, electricity generation, photovoltaic effect, energy transfer, climate science |
| Maths | Data analysis, graphs, percentages, energy calculations, financial modelling |
| Geography | Climate change, sustainability, energy resources, global energy systems |
| Design Technology | Engineering, system design, sustainability in design |
| PSHE/Citizenship | Environmental responsibility, sustainable living, community action |
| Business Studies | Investment analysis, payback periods, cost-benefit analysis |
Real-Time Display Systems
Most school solar installations include an educational display showing:
- Current power generation (kW)
- Daily, monthly, annual energy generated (kWh)
- CO₂ savings (equivalent trees planted, cars off road)
- Financial savings
- Historical data and graphs
Displays can be mounted in reception areas, corridors, or classrooms. Many systems also have web portals or apps accessible from any computer.
Educational Display Costs
| Display Type | Cost |
|---|---|
| Web portal access only | Often included free |
| Dedicated wall-mounted screen | £500-£1,500 |
| Interactive touchscreen display | £1,500-£3,000 |
| Integration with existing school screens | £200-£500 |
Eco-Schools and Awards
Solar installations support various environmental accreditations:
- Eco-Schools Green Flag: Solar directly supports energy topic and demonstrates action
- Sustainable Schools Award: Evidence of carbon reduction commitment
- Carbon Literacy certification: Practical demonstration for student learning
Technical Considerations for Schools
Roof Assessment
Most school buildings have flat roofs, which are ideal for solar. Key assessment points:
- Roof condition: Must have 15-20+ years remaining life. If major roof works are due, do them first (or combine with CIF bid).
- Structural capacity: Flat roof solar systems add 12-20 kg/m². Older school buildings need structural engineer assessment.
- Membrane type: Felt, EPDM, single-ply — all compatible with ballasted mounting systems
- Asbestos: Pre-1999 buildings may have asbestos-containing materials. Survey required before any roof work.
- Access: Consider safe access for installation and future maintenance
Electrical Connection
- Existing supply: Check main incoming supply capacity — most schools have adequate capacity for solar
- Distribution board: Connection point for solar inverter output
- Metering: Generation meter for monitoring; export meter if claiming SEG payments
- G99 application: Required for systems over 16A per phase (typically 3.68kW+ single phase or 11kW+ three phase)
Planning Permission
Solar installations on school buildings usually fall under permitted development and don’t require planning permission, unless:
- The school is a listed building
- The school is in a conservation area and panels would be visible from the highway
- Panels would protrude more than 200mm from the roof slope or 1m above the roof
Most flat roof installations meet permitted development criteria easily.
Installation Timing
Schools can minimise disruption by scheduling installation during school holidays:
| System Size | Installation Duration | Best Holiday |
|---|---|---|
| 20-30kW | 1-2 weeks | Half-term or Easter |
| 50-75kW | 2-3 weeks | Easter or summer |
| 100kW+ | 3-5 weeks | Summer holidays |
Electrical connection work may need to happen during a weekend or holiday to avoid disrupting school operations.
Battery Storage for Schools
Battery storage can increase self-consumption by storing surplus generation for use later in the day or the following morning:
When Batteries Make Sense
- Breakfast clubs and after-school activities: Schools with significant early morning or late afternoon demand can use stored solar
- Weekend and holiday use: If school has significant baseload (IT systems, refrigeration, security), batteries reduce export and increase self-use
- Demand charge reduction: Batteries can reduce peak demand charges on some commercial tariffs
When to Skip Batteries
- Very high term-time self-consumption: If you’re already using 80%+ of generation, batteries add cost but little extra value
- Limited budget: Solar panels alone deliver better returns than smaller solar + battery
- Short holiday closures: The export “waste” during holidays may not justify battery cost
Battery Costs for Schools
| Battery Size | Cost | Best Paired With |
|---|---|---|
| 20kWh | £10,000-£15,000 | 20-30kW solar |
| 50kWh | £22,000-£35,000 | 50-75kW solar |
| 100kWh | £40,000-£65,000 | 100kW+ solar |
For most schools, we recommend installing solar first without batteries. Monitor actual self-consumption patterns for a year, then assess whether adding batteries makes financial sense.
Step-by-Step Process for Schools
1. Initial Assessment (2-4 weeks)
- Review electricity bills to understand current usage patterns
- Identify potential roof areas (flat roofs, south-facing pitched sections)
- Check for obvious issues (shading, roof condition, listed status)
- Discuss with governors/trustees and senior leadership
2. Feasibility Study (2-4 weeks)
- Commission a feasibility study from a solar installer or energy consultant
- Structural assessment of roof if needed
- Electrical capacity review
- Estimated system size, cost, and savings
- Cost: Often free from installers seeking the work; £500-£1,500 for independent consultant
3. Funding Application (4-12 weeks)
- Prepare Salix application (if using), including energy savings calculations
- Or prepare CIF bid (if combining with other works)
- Or negotiate PPA terms with providers
- Or secure capital budget approval from governors
4. Procurement (4-8 weeks)
- Obtain quotes from 3+ MCS-certified commercial solar installers
- Use procurement frameworks where available (local authority, DfE recommended)
- Evaluate on price, experience (school references), warranty, aftercare
- For academies, ensure compliance with trust financial regulations
5. Contract and Design (2-4 weeks)
- Award contract to chosen installer
- Detailed system design
- DNO application for grid connection
- Building control notification if required
6. Installation (1-5 weeks)
- Schedule during holidays where possible
- Coordinate with site manager for access, safety, and facilities
- Electrical connection (may require brief power shutdown)
- Commissioning and testing
7. Handover and Operation
- System handover with operations and maintenance documentation
- Staff training on monitoring system
- Registration for Smart Export Guarantee (if exporting)
- Educational display installation and curriculum integration
- Celebration/launch event with students and community
Common Questions from Schools
Do we need governor/trustee approval?
Yes. Solar installation is typically a capital project requiring formal board approval. Include it in a board meeting agenda with a paper covering costs, funding, savings, and educational benefits.
What about academies vs maintained schools?
Both can install solar. Academies have more autonomy over capital decisions but must follow their funding agreement and trust financial procedures. Maintained schools may need LA involvement, but many LAs actively support school solar projects.
Will installation disrupt school operation?
Minimally, if scheduled during holidays. The main disruption is the electrical connection, which may require a brief power shutdown — typically done over a weekend or during a holiday.
Who maintains the system?
For school-owned systems, the school is responsible for maintenance, though this is minimal (occasional cleaning, annual visual check). Many installers offer maintenance contracts (£200-£500/year). For PPA systems, the provider typically handles all maintenance.
What happens if the school closes or merges?
Solar systems are fixed assets that transfer with the building. If the school closes, the LA or trust inherits the asset. For Salix loans, the outstanding balance would need to be settled from the school’s closure funds.
Can we install on multiple buildings?
Yes. Many schools install across main buildings, sports halls, and separate blocks. This can be done as one project or phased over multiple years.
Grants and Incentives Summary
| Incentive | Value | Notes |
|---|---|---|
| Salix interest-free loan | 100% of project cost | Repaid from savings over 8-12 years |
| Condition Improvement Fund | Up to 80-90% grant | Competitive bidding; best combined with roof works |
| Smart Export Guarantee | 4-15p per exported kWh | Ongoing income for surplus electricity |
| 0% VAT | Saves 20% on installation cost | Schools already VAT exempt on most purchases |
| Local authority schemes | Varies by area | Contact LA sustainability team |
| PPA (free installation) | £0 upfront | Lower long-term savings but no capital needed |
Summary
| Aspect | Details |
|---|---|
| System size | 20-50kW (primary), 50-150kW (secondary) |
| Cost | £18,000-£135,000 depending on size |
| Cost per kW | £800-£1,100 (reduces with scale) |
| Annual savings | £4,000-£30,000+ |
| Payback | 5-10 years (self-funded or Salix) |
| 25-year savings | £100,000-£500,000+ |
| Best funding routes | Salix (interest-free), CIF (if roof works needed), PPA (if no capital) |
| Self-consumption | 60-75% average (excellent match with school hours) |
| Educational value | Significant — curriculum links, real-time displays, eco-credentials |
| Installation timing | School holidays (Easter or summer) |
Solar panels are one of the best investments a school can make. The financial returns are strong — £100,000-£500,000+ in savings over 25 years — and the educational and environmental benefits multiply the value further. With interest-free Salix loans available, most schools can install solar with zero impact on their operating budget.
If your school hasn’t yet explored solar, now is the time. Energy prices are high, panel costs are low, funding is available, and every year you wait is a year of savings lost.
For general solar system information, see our guide to solar panel systems. For cost details, see our solar panel cost guide. For commercial installations, see our commercial solar costs guide.
