School solar PSDS funding — UK 2026 application strategy
Public Sector Decarbonisation Scheme (PSDS) is the dominant UK funding route for school solar. Phase 4 funding is currently active with multi-billion-pound capital availability for schools, academies, FE colleges, and multi-academy trusts. Successful applications consistently bundle solar with heat pumps and fabric efficiency to clear the cost-per-tonne CO₂ threshold.
Headline answer
Solar-only school applications rarely score well on PSDS Phase 4. Bundled applications (solar + heat pump + fabric + LED) consistently win 75-100% grant cover. Multi-academy trusts applying as portfolio bids score better than single-school applications. Use Salix loans for the non-grant portion at zero interest.
Why bundled applications win
PSDS Phase 4 scoring is dominated by cost-per-tonne CO₂ saved over project lifetime. Solar-only applications typically score £400-500/tonne — above the £350/tonne soft cap. Bundled applications deliver £200-320/tonne and routinely receive 75-100% grant.
The reason: heat pumps replace gas (high carbon) with electricity (low carbon, getting lower as grid decarbonises). The cost-per-tonne calculation captures this efficiently. Solar replaces grid electricity (already partly decarbonised) with on-site generation — same carbon outcome but at higher cost-per-tonne. Bundling them lets the heat pump's strong cost-per-tonne anchor the application while solar offsets the heat pump's additional grid demand.
Multi-academy trust portfolio bids
MATs applying as portfolio bids consistently outperform single-school applications because:
- Overhead amortisation — application development cost (typically £30-80k) spread across 8-12 schools.
- Procurement efficiency — single tender for installation across multiple schools delivers 15-25% cost saving vs separate tenders.
- Stronger evaluation scoring — assessors prioritise scale and replication potential.
- Internal capacity demonstration — MATs with central estate management score higher than fragmented school-by-school capacity.
Worked example: 8-school MAT bundled bid
Application: 8-school West Yorkshire MAT, solar + heat pumps + fabric + LED + BMS.
Total project cost: £2.35m across 8 schools.
PSDS grant awarded: 78% = £1.83m.
Salix loan (zero interest): £520k over 10 years for non-grant portion.
MAT direct contribution: minimal — interest-free loan amortises through energy savings.
Year-1 energy savings across portfolio: £342k.
Net position: cash positive from year 1 (savings > loan repayments + minimal direct contribution).
Carbon savings: 1,180 tonnes CO₂ year 1; 25,500 tonnes lifetime.
Sector-specific FAQs
Are CIF and PSDS the same thing?
Can independent schools access PSDS?
What if our MAT has only 3-4 schools?
How long does PSDS application take from start to grant award?
Can we apply for solar without heat pumps?
Related content
PSDS and SALIX funding for schools and academy trusts
Schools, academies, and multi-academy trusts (MATs) have access to the Public Sector Decarbonisation Scheme as a primary source of capital grant funding for commercial solar. SALIX Finance administers PSDS on behalf of the government and maintains a separate dedicated Education Decarbonisation Fund with more targeted terms for the school estate.
The school estate is one of the UK largest energy consumers in the public sector, with approximately 22,000 school buildings consuming over 10 TWh of electricity and gas annually. Government policy explicitly targets schools as a priority for decarbonisation, making the funding landscape relatively favourable for well-prepared applications.
Which schools qualify for PSDS?
| School type | PSDS eligible? | Notes |
|---|---|---|
| Academy trusts (all structures) | Yes | Direct application to SALIX as public body |
| LA-maintained schools | Yes — via local authority | LA submits on behalf of maintained schools |
| Foundation schools | Yes — confirm with LA | Foundation trust may apply directly |
| Independent schools | No | PSDS is public sector only |
| FE colleges | Yes | Via separate SALIX FE funding stream |
| University buildings | Partial — check HE-specific schemes | UKIB and sector-specific finance available |
What PSDS typically funds for schools
Rooftop solar PV
Primary use case. School buildings with south-facing roofs and daytime electricity demand profile are ideal. A 50–150kWp system on a secondary school typically saves £12,000–£35,000/year in electricity costs.
Solar + battery storage
PSDS increasingly funds battery storage alongside solar, allowing schools to shift solar generation into evening activities, after-school clubs, and weekend lets — improving self-consumption and economics.
Heat pump replacement of gas boilers
Core PSDS priority. Solar paired with ASHP can replace gas heating in many school buildings, eliminating fossil fuel dependency. This combination scores highest in PSDS assessments.
LED lighting upgrades
Often funded as part of a wider decarbonisation package. LED upgrades reduce electricity demand and improve the solar self-consumption ratio.
Typical PSDS grant amounts for schools
| School type | Typical solar system | Project cost | PSDS grant (60–80%) | School contribution |
|---|---|---|---|---|
| Primary school (1,500 pupils) | 25–50kWp | £25,000–45,000 | £15,000–36,000 | £5,000–12,000 |
| Secondary school (1,000+ pupils) | 50–150kWp | £45,000–130,000 | £27,000–104,000 | £9,000–35,000 |
| MAT (10+ schools, combined) | 500kWp–2MWp | £425,000–1,600,000 | £255,000–1,280,000 | £85,000–400,000 |
| Sixth form / FE college | 100–300kWp | £85,000–260,000 | £51,000–208,000 | £17,000–70,000 |
SALIX loan: the bridge for unfunded costs
Where PSDS grant does not cover the full project cost, SALIX offers 0% interest loans to schools and MATs. These are repaid from energy cost savings over a period typically equal to the project payback period (usually 5–12 years). For most solar projects, the energy savings exceed the annual loan repayment — meaning the project is cash flow positive from year one.
SALIX loan application
Applied for simultaneously with or just after PSDS grant award. Requires a detailed energy saving calculation, a DfE-approved project specification, and confirmation of procurement route.
MAT portfolio approach
Large MATs applying for PSDS across 10+ schools can negotiate a portfolio SALIX loan covering all sites, with a single consolidated repayment structure. This simplifies administration and may improve terms.
PPA as an alternative where PSDS is not available
Where schools cannot access PSDS (independent schools, schools with insufficient capital contribution, or applications outside funding windows), a developer PPA is the primary alternative. A school PPA delivers 10–20% below-tariff electricity with zero upfront cost, zero capital commitment, and developer-funded O&M.
School PPA considerations
Ensure the PPA developer handles all planning, structural surveys, and landlord (LA) consents. Academy trusts can contract directly; LA-maintained schools need LA approval. Contract term should not exceed the school building expected useful life.
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