Is Solar Worth It for a Fabrication Business in 2026?

The honest answer up front

Solar is worth it for the large majority of UK metal-fabrication and engineering firms, and the reason is not the panels themselves. It is the way a fabrication shop uses electricity. Metal fabrication is overwhelmingly a single-shift, Monday to Friday, daytime operation, so its demand curve lands almost exactly on top of the solar generation curve. That match is the whole game, and it is what gives fabrication one of the strongest self-consumption profiles of any building type in the country.

But “worth it” is not a slogan, it is a calculation. This guide sets out honestly when rooftop solar stacks up for a fab shop, when it does not, and what actually decides the answer for your specific unit. If your circumstances fall into the “does not stack up” list further down, we will tell you.

Why fabrication is a strong solar candidate

Industrial electricity prices roughly doubled between 2021 and 2024. For a shop running welders, plasma and fibre-laser cutters, CNC machining centres, press brakes and a rotary-screw compressor, power is now the biggest controllable cost after steel and labour, and it is eating the margin on fixed-price tendered work you cannot always re-price.

Here is the part competitors miss. A fabrication shop has a large, near-constant daytime baseload sitting underneath its spiky process peaks:

• A rotary-screw compressor cycling all day to hold line pressure, usually the single biggest consumer.
• Legally-required LEV weld-fume extraction, which must run whenever anyone welds under HSE Safety Bulletin STSU1-2019, because all welding fume including mild steel is now a Group 1 carcinogen.
• Fibre-laser chillers, CNC coolant pumps, hydraulics and chip conveyors that run continuously.

Solar feeds that steady baseload smoothly, and the welding, plasma and laser peaks soak up the midday generation on top. The result is high self-consumption, which is the single number that decides your return.

Self-consumption is where the money is

A unit of solar you use on site replaces grid electricity at your full import rate, around 25 to 30p per kWh for commercial users. A unit you export earns only the Smart Export Guarantee rate, supplier-set and typically 12 to 16p per kWh in 2026. So the goal is to consume, not export.

Because you run in daylight hours, 70 to 90 percent of everything a fabrication array makes is used on site at the higher rate. A home sits empty during the day and exports most of its midday output cheaply. A 24/7 process plant also exports more of its solar than you will, because its overnight load is met by the grid. Your single-shift pattern is not a weakness, it is precisely why the payback is short.

What a fabrication install typically costs and returns

The table below uses verified sector figures for common fabrication sub-sectors. Payback assumes a single daytime shift and high self-consumption. Treat these as illustrative planning ranges, not a quote, because real numbers come from your own half-hourly meter data.

Workshop type	Typical system	Project value	Typical payback
Welding & engineering	40 to 200 kW	£30,000 to £150,000	~5.5 years
Metal fabrication	60 to 250 kW	£45,000 to £185,000	~5 years
CNC machining	80 to 350 kW	£58,000 to £250,000	~4.5 years
Laser & plasma cutting	100 to 400 kW	£70,000 to £285,000	~4 years
Structural steel	150 to 500 kW	£100,000 to £330,000	~4.5 years

The pattern is clear. Bigger, higher self-consumption sites such as laser-profiling and structural-steel plants pay back fastest, small jobbing units a little slower, but nearly all land inside a 3 to 7 year window. After payback, the array keeps generating for 25 years, warranted at around 84 percent output at year 25, so most of its life is pure return. For a full cost breakdown by workshop size, see our fabrication solar cost guide and the cost page.

The tax and funding picture in 2026

Solar PV is special-rate plant and machinery, so a couple of points matter and are widely misreported:

• The Annual Investment Allowance gives 100 percent year-one tax relief on the first £1m of qualifying spend, which covers most SME fabrication installs in full. That is worth up to roughly 25 percent of the cost off your corporation tax bill for a profitable company.
• Above £1m, a 50 percent first-year allowance applies to the special-rate balance, then 6 percent writing-down allowance thereafter.
• Solar does not qualify for full expensing, which is main-rate only. Anyone telling you it does is wrong.
• On-site solar and battery are exempt from business rates in England to 31 March 2035.
• Commercial VAT is 20 percent and reclaimable by a VAT-registered business.

You may not need the capital at all. Most installs are funded through asset finance over five to seven years, cash-flow positive from month one because the finance payment is smaller than the bill it replaces, or a zero-capex Power Purchase Agreement where a funder owns the array and you buy the power below grid. That keeps your budget free for a new laser or press brake. See our grants and funding guide, and always confirm your tax position with an accountant, because these figures are illustrative and depend on your profits.

When solar does NOT stack up for a fab shop

Being honest cuts both ways. There are real situations where we will advise you to wait, size down, or use a PPA instead of buying:

• A short remaining lease. If you rent and have only a couple of years left with no renewal, an owned system may not pay back before you leave. The fix is usually a smaller, faster-payback array or a PPA so you are never out of pocket, but sometimes the answer is simply not yet.
• A tiny electrical load. A very small unit spending only a few thousand pounds a year on power has little for the array to offset, so the self-consumption that drives the return is not there. Below a certain spend the numbers do not clear the bar.
• A shaded roof. Neighbouring buildings, tall plant, or a north-only aspect that puts the usable roof in shade for much of the day cuts generation where it matters most. Heavy shading can undermine an otherwise good site.
• A fragile or asbestos-cement roof. Any building from before 2000 needs an asbestos survey, and asbestos-cement roofs cannot take PV directly. Over-cladding or re-roofing can often be funded inside the project, and since panels outlast most industrial roofs, doing both at once is frequently the right call, but it does change the numbers, so you need to know before you commit.
• Little daytime overlap. The rare fab shop that runs mostly nights or weekends loses the self-consumption advantage. Here a battery has to do more of the work, and the case needs modelling carefully rather than assuming.

If your unit sits in one of these buckets, that does not always mean no. It means the design changes, and the honest modelling matters more than ever.

How to decide for your own shop

The only reliable way to answer the question for your unit is to model it from real data, not a rule of thumb. The method we use:

1. Pull 12 months of half-hourly meter data. This shows your true daytime load shape, not an annual average.
2. Size the array to your daytime load, aiming to cover roughly 70 to 90 percent of daytime consumption, anchored on the steady loads that run all day.
3. Survey the roof. A structural engineer checks the portal frame, because a framed array adds around 15 to 25 kg per square metre plus wind uplift, and any EOT crane-rail loads are deducted from residual capacity first.
4. Check tenure, shading and grid. Lease length, shade through the day, and G99 connection headroom all feed the decision.
5. Model cash, finance and PPA side by side so you can compare like for like against buying a machine instead.

For welding and jobbing engineering shops in particular, where spiky arc loads sit on a compressor and whole-shop extraction baseload, see our welding and engineering workshops page for how the load profile shapes the design.

The verdict

For a typical UK fabrication or engineering firm with a single daytime shift, a sound roof and a reasonable lease or freehold, rooftop solar is worth it, and the 3 to 7 year payback backs that up. The doubled, volatile power bill is hedged for 25 years, and you gain the on-site renewable line item that automotive, rail and construction-steel customers increasingly demand in tenders.

Where it does not stack up, we will say so plainly, and where it needs a different structure such as a PPA on a leased unit, we will show you that too. The next step is a free feasibility study on your actual figures. Get a tailored quote and we will model your site honestly before you spend anything. For the wider health and compliance context around weld-fume extraction, the HSE guidance on welding-fume health risks is the authoritative reference.