UK businesses installing commercial solar in 2026 can access over 20 grant + funding schemes — but there\'s no single "national commercial solar grant" and the landscape is genuinely fragmented across UK government, devolved governments, regional combined authorities, sector-specific funds, and ongoing tax relief regimes. This page covers the complete 2026 funding landscape with eligibility, typical award amounts, application timelines, and how to stack multiple grants for maximum capex reduction. For sector-specific grant detail see grants and funding; for IETF specifically see IETF Phase 3; for Salix specifically see Salix PSDS.
The complete 2026 UK commercial solar grants table
Below is the full 2026 UK commercial solar grant landscape. Each row shows the scheme name, eligibility, typical award amount, application timing, and source.
| Scheme | Who qualifies | Award amount | Application timing | Source |
|---|---|---|---|---|
| 100% Annual Investment Allowance (AIA) | Profitable UK Ltd Cos | 25% of capex (year-1 tax relief) | Universal, no application | HMRC capital allowances regime |
| Salix PSDS Phase 4 | Public sector (NHS, schools, councils, universities) | 100% capex grant | Biannual rounds 2024-2028 | Salix Finance / DESNZ |
| IETF Phase 3 | Energy-intensive manufacturers SIC codes 10-26 | 15-30% capex grant (up to £14m) | Competitive rounds | DESNZ / Defra |
| Smart Export Guarantee (SEG) | All businesses with MCS-certified solar | 4-15p/kWh export income | Universal, ongoing | Ofgem-regulated suppliers |
| GMCA Net Zero Accelerator | Greater Manchester businesses | 30-50% capex grant | Periodic rounds | Greater Manchester Combined Authority |
| WMCA Decarbonisation Grant | West Midlands businesses | 25-40% capex grant | Periodic rounds | West Midlands Combined Authority |
| WYCA Net Zero Fund | West Yorkshire businesses | 20-40% capex grant | Periodic rounds | West Yorkshire Combined Authority |
| LCRCA Green Growth Fund | Liverpool City Region businesses | 20-40% capex grant | Periodic rounds | Liverpool City Region Combined Authority |
| Welsh Government Net Zero Grants | Welsh businesses | 20-50% capex (sector-dependent) | Ongoing programmes | Welsh Government / Business Wales |
| Local Energy Scotland CARES | Scottish community + SME businesses | Variable grant + loan | Ongoing | Local Energy Scotland |
| Farming Investment Fund (FIF) | UK farms (DEFRA-registered) | 25-40% capex on solar + battery | Periodic rounds | DEFRA |
| Farming Equipment + Technology Fund (FETF) | UK farms (specific equipment list) | 25-40% of eligible equipment | Annual rounds | DEFRA |
| UKSPF (UK Shared Prosperity Fund) | SMEs in eligible regions | Variable — typically £5-50k grants | Regional allocation cycles | DLUHC (Levelling Up) |
| Industrial Strategy Net Zero Funds (regional) | Region-specific industrial cluster members | Variable | Periodic rounds | Regional industrial strategies |
100% Annual Investment Allowance — the universal grant-equivalent
The Annual Investment Allowance (AIA) is HMRC\'s 100% first-year capital allowance for plant and machinery investment. Commercial solar PV qualifies under the standard plant and machinery rules. The mechanics: a profitable UK limited company expenses 100% of qualifying capex against year-one taxable profits, up to the £1,000,000 annual cap. At the 25% main rate of corporation tax in 2026, every £100 of AIA-eligible spend generates £25 of year-one tax relief — equivalent to a 25% capex grant. Worked example: a £100,000 100 kW solar system. AIA claim £100,000 → corporation tax saving £25,000 → net effective capex £75,000. Sole traders and partnerships on cash basis can also claim AIA at their marginal income tax rate (40% AIA equivalent for higher-rate taxpayers — even better than corporation tax). Charities and not-for-profits without corporation tax position can\'t use AIA — alternative grant routes (PPA, Salix PSDS) work better for these organisations. See AIA service page.
Salix PSDS Phase 4 — the £530m public sector grant
The Salix Finance Public Sector Decarbonisation Scheme (PSDS) is the largest direct grant scheme for UK commercial solar in 2026. Phase 4 has £530m committed for 2024-2028 with biannual application rounds. Eligibility: public sector bodies — NHS trusts, state-funded schools and academies, local authorities, universities, blue light services. Award type: 100% grant funding for whole-building decarbonisation including solar PV + LED + heat pump replacement. Typical PSDS awards: £180k-£650k per project. Application: 60-90 page submission bundle including energy data, project design, financial projections, carbon impact calculations. We handle PSDS applications end-to-end for public sector clients. Success rate: approximately 35-45% of submitted applications are funded — competitive but achievable for well-prepared bids. See Salix PSDS detailed guide.
IETF Phase 3 — the manufacturing decarbonisation grant
The Industrial Energy Transformation Fund (IETF) Phase 3 is the largest direct grant scheme for UK energy-intensive manufacturing. Phase 3 covers 2024-2028 with competitive application rounds. Eligibility: manufacturers in SIC codes 10-26 (food, chemicals, plastics, metals, ceramics, glass, paper, basic metals) with demonstrable energy intensity above sector benchmarks. Award type: 15-30% capex grant for combined decarbonisation bids (solar + process electrification + heat recovery + compressed air upgrades). Up to £14m per project. Application: competitive bid requiring energy data, technical drawings, financial projections, carbon impact, and value-for-money case. Typical IETF awards £100k-£8m. Stacking with AIA: IETF grants reduce the AIA-eligible capex base proportionally but the combined IETF + AIA stack typically delivers 40-55% effective capex reduction. Success rate: approximately 20-30% of submitted applications. We handle IETF applications for qualifying manufacturers. See IETF Phase 3 deep-dive.
Smart Export Guarantee (SEG) — universal ongoing income
The Smart Export Guarantee (SEG) is Ofgem-regulated. Active SEG providers in 2026 must offer at least one tariff to commercial customers with MCS-certified solar systems. SEG rates vary materially by provider: Octopus Outgoing Fixed pays 10-15p/kWh (consistently the highest UK commercial SEG rate); British Gas Export & Earn Flex pays 6-12p/kWh on variable tracker; EDF Renewable Heat Income pays 5-10p/kWh; Bulb Smart Export pays 5-8p/kWh; smaller suppliers typically 4-6p/kWh. To qualify: MCS-certified installation, separate generation meter, registration with chosen SEG supplier (doesn\'t need to be your import supplier). Typical annual SEG income: £500-£15,000 for sub-100 kW SME systems; £5,000-£50,000+ for industrial scale.
Regional Mayoral Combined Authority grants
Four major Mayoral Combined Authorities operate decarbonisation grant schemes accessible to commercial solar projects. Greater Manchester Combined Authority (GMCA) Net Zero Accelerator — 30-50% capex grants for Greater Manchester SME and mid-market businesses. West Midlands Combined Authority (WMCA) Decarbonisation Grant — 25-40% capex grants for West Midlands businesses. West Yorkshire Combined Authority (WYCA) Net Zero Fund — 20-40% capex grants for West Yorkshire businesses. Liverpool City Region Combined Authority (LCRCA) Green Growth Fund — 20-40% capex grants for Liverpool City Region businesses. Application timing varies — typically periodic rounds 2-4 times per year. Awards capped at £100k-£200k per project typically. Combined with AIA the effective capex reduction reaches 45-65% for eligible regional businesses.
Welsh + Scottish + Northern Ireland devolved grants
Welsh Government Net Zero Grants: ongoing programmes via Business Wales offering 20-50% capex grants for Welsh businesses depending on sector. Particularly accessible for tourism, hospitality, and food-and-drink sectors. Local Energy Scotland CARES (Community And Renewable Energy Scheme): grant + loan combinations for Scottish community and SME businesses. Scottish Enterprise + Highlands and Islands Enterprise: region-specific funding for Scottish businesses. Northern Ireland: InvestNI capital grants programme covers commercial solar for qualifying NI businesses; less well-funded than mainland equivalents but still material at 15-30% capex contribution levels.
DEFRA farm-specific grants
UK farms access two DEFRA grant schemes for solar PV. Farming Investment Fund (FIF): 25-40% capex on combined solar + battery + electrification projects. Applications via DEFRA portal in periodic rounds. Farming Equipment + Technology Fund (FETF): 25-40% capex on specific equipment lists (which has included solar PV in recent rounds, subject to current scheme parameters). Annual application rounds. For Welsh farms add Sustainable Production Grant; for Scottish farms add Sustainable Agriculture Capital Grant Scheme; for Northern Ireland add Farm Business Improvement Scheme. We have specific experience with farm grant applications via our solar panels for farms specialist site.
How to stack multiple grants for maximum capex reduction
The best UK commercial solar economics come from stacking 2-3 grants on the same project. Stack 1: Public sector grand slam — Salix PSDS (100% capex grant) + SEG export income + regional council climate fund top-up = effectively 100%+ capex covered with ongoing operational income. Typical for council leisure centres, NHS hospital outbuildings, university campuses. Stack 2: Manufacturer combined-measure — IETF Phase 3 (20-30% capex grant) + 100% AIA on residual capex (25% effective on remainder) + SEG export = 40-55% combined capex reduction. Typical for food production, chemicals, ceramics. Stack 3: Regional SME standard — Mayoral Combined Authority grant (25-40% capex) + 100% AIA on residual + SEG export = 45-65% combined capex reduction. Typical for Manchester / Birmingham / Leeds SMEs. Stack 4: Farm grand slam — DEFRA FIF (25-40% capex) + 100% AIA on residual + SEG export + Smart Export agriculture premium = 45-60% combined capex reduction. Typical for dairy and intensive poultry farms.
2026 grant application calendar
Application timing across the major schemes in 2026. Salix PSDS Phase 4: typically Spring (March/April) and Autumn (September/October) application rounds. IETF Phase 3: competitive rounds approximately every 6 months — check DESNZ for current round timing. GMCA / WMCA / WYCA / LCRCA grants: periodic rounds, typically 2-4 per year — check respective Combined Authority for current windows. UKSPF: regional allocation cycles vary by local authority. DEFRA FIF / FETF: typically annual rounds with Autumn application windows. AIA tax relief: claimed via annual corporation tax return — no separate application required. SEG export tariffs: applied for once at install commissioning, ongoing income thereafter. We track grant application windows for our clients and notify when relevant rounds open.
Recommended next step: free grant eligibility screen
Rather than trying to navigate the 20+ scheme landscape alone, get a free grant eligibility screen as part of our desk feasibility. We assess your specific situation (sector, region, project size, corporation tax position) against the full UK 2026 grant landscape and identify which schemes you qualify for, expected award amounts, application timing, and recommended stack. For grants over £50k we offer success-fee grant application management (no upfront cost, fee only paid if grant awarded). Submit our quote form below to start.
Solar panel grants for UK businesses — common questions
What solar panel grants are available for UK businesses in 2026?
Over 20 grant and funding schemes are available for UK business solar in 2026. The 4 most universally accessible: (1) 100% Annual Investment Allowance for profitable Ltd Cos — universal, no application, delivers 25% effective capex reduction. (2) Smart Export Guarantee export tariffs — 4-15p/kWh, universal for MCS-certified systems. (3) Salix PSDS for public sector — 100% capex grant for NHS, schools, councils, universities. (4) IETF Phase 3 for energy-intensive manufacturers — 15-30% capex grant for SIC codes 10-26. Plus 15+ regional schemes from Mayoral Combined Authorities, Welsh Government, Scottish Government, and sector-specific funds.
Can a UK SME get a grant for commercial solar panels?
Most UK SMEs access 100% Annual Investment Allowance (AIA) — which isn't technically a "grant" but functions equivalently, delivering 25% of capex back as year-one corporation tax relief. For SMEs in specific regions or sectors, additional grant schemes stack on top: Mayoral Combined Authority decarbonisation grants (Greater Manchester, West Midlands, West Yorkshire, Liverpool City Region) typically offer 20-50% capex grants for eligible local businesses; UKSPF regional allocations offer £5-50k SME grants; Welsh Government and Local Energy Scotland have dedicated SME programmes. Charities and not-for-profits without corporation tax position should focus on grant-funded routes or PPA rather than AIA. We screen all grant eligibility as part of our free desk feasibility.
How much can UK businesses get in solar grants?
Grant amounts vary widely by scheme and project. The biggest grants: Salix PSDS (public sector) — 100% capex grant, typical awards £180k-£650k per project. IETF Phase 3 (energy-intensive manufacturing) — 15-30% capex grant, typical awards £100k-£8m per project. Regional Mayoral Combined Authority grants — 20-50% capex, typical awards £20k-£200k. UKSPF SME grants — typical awards £5k-£50k. Combined with universal 100% AIA tax relief (25% effective capex reduction), profitable Ltd Cos in eligible regions/sectors can achieve 40-70% total capex reduction through combined grant + tax stacks. We model the full stack for every project at quote stage.
How do I apply for solar panel grants for my UK business?
Application process varies by scheme. Salix PSDS: biannual application rounds, application bundle includes energy data + project design + financial projections + carbon impact (typical 60-90 page submission). IETF Phase 3: competitive rounds with deadlines, application requires demonstrable energy intensity + combined-measure project bid. Regional Mayoral Combined Authority grants: typically online portal application with project description + quotes + business case. UKSPF: applied via local authority allocation. We handle grant applications end-to-end for clients — typically 30-50 hours of professional time per major application. We charge a success-fee on grants over £50k (no upfront cost, fee only if grant awarded).
Is there a government grant for solar panels for businesses in the UK?
Yes — multiple UK government schemes support commercial solar. The largest is the 100% Annual Investment Allowance regime (HMRC) covering all profitable limited companies. Salix Public Sector Decarbonisation Scheme is the largest direct grant scheme for public sector (£530m committed 2024-2028). IETF Phase 3 is the largest direct grant for industrial decarbonisation. Plus regional schemes via Mayoral Combined Authorities, Welsh and Scottish governments, and sector-specific schemes (DEFRA for farms, Sport England for community sports, faith-based decarbonisation funds for places of worship). No single "national commercial solar grant" exists — the funding landscape is fragmented across 20+ schemes that businesses navigate based on sector + region.
What is the AIA and how does it work for commercial solar in 2026?
The Annual Investment Allowance (AIA) is HMRC's 100% first-year capital allowance for plant and machinery investment, including commercial solar PV. The mechanics: a profitable UK limited company expenses 100% of qualifying capex against year-one taxable profits, up to the £1,000,000 annual cap. At the 25% main rate of corporation tax (2026), every £100 of AIA-eligible spend generates £25 of year-one tax relief. A £100,000 100 kW solar system: £100,000 AIA claim → £25,000 corporation tax saving → net effective capex £75,000. AIA is universal (no application, no competitive process) — any profitable Ltd Co automatically benefits. Sole traders and partnerships using cash basis can also claim AIA at their marginal income tax rate. See our AIA service page for full mechanics.
Are there grants for commercial battery storage in the UK?
Battery storage qualifies for: 100% Annual Investment Allowance (universal, 25% effective capex reduction for profitable Ltd Cos); IETF Phase 3 grants where combined with solar + process electrification (energy-intensive manufacturers); DEFRA Farming Investment Fund for farm-installed batteries; Salix PSDS for public-sector battery + solar combined projects. Battery storage doesn't access dedicated UK national battery grant schemes — the market relies on revenue-stack economics (DUoS peak shaving + Dynamic Containment + SEG arbitrage) for project payback rather than capital grants. Typical commercial battery payback in 2026: 4-7 years gross capex via revenue stack; 3-5 years net of AIA.