Solar Grants for Business: What You Can Claim in 2026

Type “solar grants for business” into a search engine and you will find pages promising thousands of pounds of free money for your rooftop array. Most of it is wrong, out of date, or quietly describing a scheme your company cannot access. That matters, because if you plan a project around a grant that turns out to be public-sector or domestic only, you can end up deferring a sensible investment while you wait for funding that was never coming.

This guide sets out the honest position for a private UK business in 2026: what actually pays, what does not apply to you, and where the real money in a solar project comes from. It is written for owners, directors and finance controllers who want the straight version before they take numbers to their accountant.

This is general information, not tax or financial advice. Scheme eligibility and rates change, so confirm the current position for your business and region before you rely on it.

The short, honest answer

For a private business buying rooftop or ground-mount solar in 2026, there is no broad capital grant that simply pays a chunk of the installation cost. The scheme most people are thinking of when they say “solar grant” is either the Public Sector Decarbonisation Scheme, which private companies cannot use, or a domestic household scheme like ECO4, which businesses cannot use either.

What does exist for you is one ongoing incentive that pays for the power you export, a handful of regional grants that come and go by area, and the tax reliefs that do far more for your numbers than any grant would. Understanding that distinction is the single most useful thing on this page, because it stops you waiting for money that will not arrive and points you at the levers that actually move the maths.

The Smart Export Guarantee: the one incentive that applies to you

The Smart Export Guarantee, or SEG, is the main ongoing incentive for business solar in 2026. It replaced the Feed-in Tariff, which closed to new applicants back in 2019, and it works differently.

Under SEG, every large electricity supplier must offer at least one tariff that pays you for the electricity your system sends back to the grid. Systems up to 5 MW qualify, so effectively every business rooftop and most ground-mount projects are eligible. Suppliers set their own rates, so it pays to compare, and indicative best rates in 2026 sit at roughly 12 to 16.5p per unit exported. That income is generally taxable for a business, so it flows through your accounts like any other receipt.

Two points keep SEG in proportion. First, you need an MCS-certified installation to qualify, which is a standard funders and insurers expect anyway. Second, and more importantly, export income is the smaller half of the solar business case. A unit of electricity you use on site displaces grid import worth roughly 26 to 32p, while the same unit exported earns you 12 to 16p. Using your own power is worth more than double exporting it, so a well-designed business system is sized to your daytime load, not to maximise export. SEG is a genuine top-up, not the heart of the return.

You can see how self-consumption and export feed into the return on our payback and ROI page, or model both against your own bill with the finance calculator.

Salix and the Public Sector Decarbonisation Scheme: not for private companies

This is the scheme most “solar grant” marketing is quietly built on, and it is the one that catches business owners out. The Public Sector Decarbonisation Scheme, administered through Salix, offers grant and interest-free loan funding for decarbonisation projects including solar. It is generous, and it is real, but it is limited to the public sector.

Eligible bodies are central government departments, the NHS, schools and academies, colleges, some universities, local authorities and emergency services. Private companies are not eligible. Neither, in most cases, is social housing. If you run a manufacturing business, a warehouse, a care home group, a farm or a professional-services firm, this is not a scheme you can apply to, however often a marketing page implies otherwise.

The reason it matters is that plenty of content blurs the line deliberately, listing PSDS alongside private-sector routes so a company reader assumes it applies. If your organisation genuinely sits in the public sector, it is worth pursuing and our grants and funding page points you to the right starting point. If you are a private business, treat PSDS as off the table and plan around the funding routes and reliefs that do apply to you.

ECO4 and the Great British Insulation Scheme: domestic only

You will sometimes see solar grants advertised under names like ECO4 or the Great British Insulation Scheme. These are household energy-efficiency schemes aimed at low-income and vulnerable homes, funded through obligations placed on energy suppliers. They do not apply to businesses at all.

For completeness, the Great British Insulation Scheme closed to new applications on 31 January 2026. Even while it was open, it was a domestic scheme, so it was never a route for a commercial premises. If you are researching solar for a building your business trades from and you find yourself reading about ECO4 eligibility bands or household income thresholds, you have wandered into domestic content and can safely disregard it.

Regional and combined-authority grants: real, but you have to check

There is one category of genuine business grant worth chasing: regional and combined-authority schemes. Some combined authorities, local enterprise partnerships and regional bodies run occasional energy-efficiency, net-zero or decarbonisation grants open to businesses in their area. These can contribute towards an audit, towards equipment, or towards a broader efficiency project that includes solar.

The catch is that they are regional, time-limited and intermittent. A grant that was open in one region last year may be closed now, and a scheme in a neighbouring authority may have completely different rules. There is no national list you can rely on, which is exactly why so much online grant content is stale. The only sound approach is to check current availability for your specific area rather than trust a guide that might be a year old. The government’s business support finder is the sensible first stop, and your local growth hub or chamber of commerce will often know what is live locally.

Because these grants are unpredictable, the honest planning advice is this: build your business case on the funding routes and tax reliefs that you can count on, and treat any regional grant you secure as a bonus that improves an already sound project, not as the thing that makes it viable.

Where the real money actually comes from: capital allowances

Here is the part that most grant-hunting business owners miss. The biggest single financial lever on a commercial solar project is not a grant at all, it is capital allowances, and unlike grants it is not first-come-first-served or restricted by region.

Solar PV is classed as special-rate plant for capital allowances. For most installs, the Annual Investment Allowance gives 100% first-year tax relief on qualifying capital spend up to £1m a year, and solar qualifies. Because the great majority of business installs cost well under £1m, that usually means you deduct the full system cost from your taxable profits in year one. At a 25% corporation tax rate, that is worth roughly 25p back for every £1 spent, delivered as a reduction in your tax bill.

To put that in perspective: on a £48,000 system, the year-one allowance is worth in the region of £12,000 of tax relief. No regional solar grant is going to hand a private business £12,000, but the tax system effectively does, for any profitable company, without an application form or a queue.

One important caveat, because it is the most misreported point in the market: solar does not qualify for 100% full expensing. Full expensing and the new 40% first-year allowance are for main-rate plant, and solar is special-rate, so those reliefs do not apply. Anyone promising “100% full expensing on solar” is quoting the wrong rule and overstating your first-year relief. The correct route is the AIA, and for spend above the £1m cap a company can use the 50% special-rate first-year allowance. The full detail is on our capital allowances explained guide.

And the other savings that behave like a grant

Two further items quietly improve the numbers and are worth knowing:

• VAT. Commercial solar is standard-rated at 20% VAT, and a VAT-registered business reclaims that through its normal VAT return. For most firms it is a cash-flow timing item rather than a real cost.
• Business rates. In England, qualifying rooftop solar installed for self-consumption is 100% exempt from business rates from 1 April 2022 to 31 March 2035, so it will not raise your rateable value in that window. Scotland and Wales run separate regimes, so check locally.

Neither is a grant, but both reduce the effective cost of ownership in a way that is far more reliable than waiting for scheme funding.

How to actually fund the project

If grants are not going to pay for your solar, the practical question becomes how to fund it. There are six routes, and the right one depends on your cash position, tax profile and how long you will hold the building. You can compare them all on our finance options compared page, but in short:

• Own it from cash or a business or green loan and you keep every pound of saving, the export income and the full tax relief.
• Spread the cost with hire purchase or asset finance and you still own the asset and claim the allowances while preserving working capital.
• Commit no capital at all through a Power Purchase Agreement, where a funder owns the system and you just buy cheaper power, accepting a lower lifetime return in exchange.

The cost page shows typical system prices, and once you have a figure the calculators let you test each route against your actual electricity spend.

The bottom line on solar grants for business

For a private UK business in 2026, the honest position is that solar grants are largely a myth. The Smart Export Guarantee pays for your exported power, regional grants occasionally help if you catch them, and everything else you read about, PSDS, Salix, ECO4, is either public-sector or domestic only.

The good news is that you do not need a grant for solar to stack up. The Annual Investment Allowance, the VAT reclaim and the business-rates exemption do more for your numbers than any grant would, and they apply to any profitable company without an application. Understand those, model your funding routes against your own bill, and you can make the decision on evidence rather than on the promise of free money that never materialises.

When you are ready to move from research to firm figures, our partner installers and funders can return costed quotes for your building. If you would prefer to compare finance providers first, our sibling site comparing commercial solar finance companies is the place to start, and when you want fully costed numbers you can request quotes from our partners.