Grants and Tax Relief for Manufacturing Solar in 2026

Capital for a solar array competes directly with production-line investment, so the finance director wants a clean modelled return, not a sales pitch. The good news is that a manufacturing solar project rarely stands on its energy savings alone. In 2026 there are four distinct funding and tax levers a UK manufacturer can pull, and used together they compress payback well inside the 5 to 7 year range typical for a rooftop install. This guide sets out each one, what it is worth, and where to check the current rules on gov.uk before you rely on any figure.

A word of caution up front. Grant windows open and close, intervention rates change, and tax policy above the Annual Investment Allowance cap moves with each Budget. Treat every number here as a starting point and confirm the live position with your accountant and the relevant government guidance before you build a business case on it.

The four levers at a glance

The table below summarises the main routes. Figures are drawn from our manufacturing sector research and reflect the position as understood in 2026.

Lever	What it does	Indicative value	Who qualifies
Annual Investment Allowance (AIA)	Full expensing of solar as plant and machinery	100 percent of the first 1 million pounds, up to roughly 25 percent effective tax saving in year one	All UK businesses paying corporation tax
Industrial Energy Transformation Fund (IETF)	Capital grants for efficiency and decarbonisation	100,000 pounds to several million per project, at a 30 to 50 percent intervention rate	Industrial sites in eligible SIC codes
Climate Change Agreements (CCAs)	Climate Change Levy discount for efficiency commitments	Substantial CCL reductions on electricity and gas	Energy-intensive manufacturing sectors
Smart Export Guarantee (SEG)	Payment for surplus power exported to the grid	Supplier-set, typically 4 to 15p per kWh	MCS-certified installs up to 5 MW

Each lever is explained in full below.

Annual Investment Allowance and full expensing

For most manufacturers the single most valuable lever is the tax treatment of the capital itself. Solar PV qualifies as plant and machinery, which means it falls under the Annual Investment Allowance. The AIA lets a business write off 100 percent of qualifying expenditure against taxable profit in the year the money is spent, up to a cap of 1 million pounds.

What that is worth

For a limited company this delivers up to roughly a 25 percent effective tax saving in year one, because the full cost of the system reduces the corporation tax bill immediately rather than being spread over many years of depreciation. On a typical manufacturing install of 200,000 to 680,000 pounds for a 250 to 800 kW plant, that first-year relief is a material contribution to the payback maths, and it is the reason most manufacturing installs are fully expensed in year one.

Where the cap bites

Larger projects run past the 1 million pound AIA ceiling. A 2 MW automotive array can reach 1.5 million pounds, and a food and beverage plant of 400 to 1,200 kW commonly sits between 300,000 and 980,000 pounds, so many mid-sized projects stay comfortably inside the cap while the largest do not. Expenditure above the AIA limit may attract a first-year allowance depending on prevailing policy, so the rate that applies to the balance is exactly the kind of figure that shifts between Budgets. Confirm the current position with your accountant rather than assuming last year’s rules still hold.

You can read the official rules on the capital allowances guidance pages on gov.uk. For a full worked example against a real system size, see our cost breakdown, which models the tax relief alongside energy savings and export income.

The Industrial Energy Transformation Fund

The Industrial Energy Transformation Fund, or IETF, is the flagship capital grant for industrial decarbonisation. It is operated by DESNZ through periodic competition windows and supports energy efficiency, deep decarbonisation, and feasibility studies at eligible industrial sites.

Eligibility and value

Eligibility runs on SIC codes, and the covered list takes in most manufacturing activity. Grants typically range from 100,000 pounds to several million pounds per project, at an intervention rate of 30 to 50 percent, meaning the fund covers part of the cost and private finance or capital covers the balance. The scheme is aimed at larger projects rather than sub-100 kW installs, so it fits the profile of a mid to large manufacturing plant rather than a small workshop.

The catch worth knowing

Because the IETF runs in competition windows, timing matters. There is no standing entitlement, and you cannot claim retrospectively for work already underway before an award. That makes the feasibility study the natural first step, because a funded or self-funded study both sizes the system and produces the technical evidence a grant application needs. Check the current window and eligibility before you rely on the fund, and read the official collection for the Industrial Energy Transformation Fund on gov.uk. Our grants and funding page tracks how the IETF stacks with the other levers on a single project.

Climate Change Agreements

Climate Change Agreements, or CCAs, work differently from a grant or an allowance. A CCA is a voluntary arrangement for energy-intensive sectors: in exchange for meeting energy-efficiency or emissions-reduction targets, a site receives a discount on the Climate Change Levy that would otherwise be charged on its electricity and gas.

How solar helps you hit the target

This is where on-site generation quietly pays twice. Every kilowatt hour of self-consumed solar reduces your metered grid consumption, which directly improves your performance against a CCA target. So a solar array does not just cut the energy bill, it also helps protect the levy discount that depends on hitting efficiency milestones. For an energy-intensive site running refrigeration, process heat, or continuous plant, that combined effect strengthens the business case beyond the raw generation savings.

CCAs apply to defined sectors, so the first question is whether your sector and site are covered by the current scheme. The eligible-sector list and the mechanics of the levy discount are set out in the Climate Change Agreements guidance on gov.uk. Energy-intensive operations such as chemical and process manufacturing and heavy food and beverage manufacturing plants are among the most likely to be in scope, and also among those with the flattest, most solar-friendly baseload.

The Smart Export Guarantee

The Smart Export Guarantee, or SEG, is the mechanism that pays you for surplus power. Any electricity your array generates but does not consume can be exported to the grid, and larger licensed suppliers are obliged to offer an export tariff for it. The scheme covers all MCS-certified installs up to 5 MW, which comfortably includes every manufacturing rooftop system.

Why it is the secondary value stream

For a manufacturing site the priority is self-consumption, not export. Self-consumed solar replaces grid electricity at your full import rate, which is far more valuable than the export tariff. SEG rates are supplier-set and typically land in the region of 4 to 15p per kWh, well below the 18 to 32p per kWh an industrial user pays to import. The working rule for sizing follows from this: install 70 to 90 percent of peak daytime demand to maximise self-consumption and avoid spilling cheap exports onto SEG.

Because the tariff is set by the supplier rather than fixed by the regulator, it pays to shop around, and the best export rate is often not offered by your current import supplier. The scheme rules are published under the Smart Export Guarantee pages on the regulator’s site, and you can review the framework at the Smart Export Guarantee on Ofgem.

How the levers stack on a real project

None of these levers is exclusive. A well-structured manufacturing project can use several at once, and that is where the payback compresses. A representative 500 kW rooftop system on a mid-sized plant might expense the bulk of its cost in year one under the AIA, apply to an open IETF window for a share of the capital, feed its self-consumed generation into a CCA efficiency target, and earn SEG income on the modest surplus.

The sequencing matters as much as the schemes themselves. Because the IETF runs in windows and cannot fund work already started, the grant application has to come first. Because the AIA is claimed in the year of expenditure, the timing of the spend affects which tax year captures the relief. And because SEG rates vary by supplier, the export contract is worth negotiating separately from the import supply. A finance team that treats these as one combined model, rather than four separate line items, tends to get the strongest result.

Financing choice interacts with the tax position too. Where a project is funded through asset finance the business still owns the system and can claim the allowances, while a power purchase agreement moves ownership to a third party who claims them instead.

Getting the numbers right for your site

The figures in this guide are ranges, and every manufacturing site sits somewhere different within them depending on baseload, roof condition, tariff, and shift pattern. The only way to turn these levers into a firm number is to model from your own half-hourly meter data rather than from estimates. That model shows the year-one tax relief, any grant the site qualifies for, the self-consumption share that drives the savings, and the export income under SEG, all in one place.

If you want that worked through for your plant, request a quote and we will build the funding stack around your actual load profile and roof. Whichever sector you are in, from automotive manufacturing to pharmaceutical manufacturing, the same four levers apply. What changes is how they weigh against each other, and that is exactly the sort of detail worth pinning down before the capital request goes to the board.