Solar panels for manufacturers, FAQs

A typical UK manufacturing solar installation ranges from around £150,000 to £1 million fully installed, depending on system size. Cost per kW is usually £750 to £950 for systems above 250 kW, falling towards £600/kW above 1 MW. The capital is normally fully expensed in year one under the Annual Investment Allowance, and most projects achieve simple payback in 5 to 7 years.

System size should be matched to your daytime baseload rather than your roof area. A common rule of thumb is to install 70 to 90 percent of peak daytime demand to maximise self-consumption. We pull 12 months of half-hourly meter data and model the optimal size, which for UK manufacturing is typically 200 to 800 kW, though anything from 100 kW to 2 MW is common.

From contract signature to full commissioning, expect 4 to 9 months. The longest single item is grid connection, where a G99 application can take 6 to 18 months from DNO submission. Physical installation is usually 4 to 10 weeks on site once materials arrive. We start the DNO application immediately after the structural survey to compress the overall timeline.

Only if the install is done badly. We use ballasted or rail-fix systems that are roof-warranty compatible and accepted by all the major UK roofing manufacturers including Kingspan, Tata Steel, Euroclad and SIG. We secure manufacturer sign-off in writing before work starts, and our 10-year insurance-backed workmanship warranty covers any fixing-related water ingress.

Yes. Rooftop installations almost never require a process shutdown. The only mandatory outage is the final grid connection, 4 to 8 hours, which we schedule to coincide with a planned maintenance window or weekend. For validated pharma lines or continuous process plant we plan the connection around your change-control and business-continuity requirements.

The Industrial Energy Transformation Fund (IETF) offers grants for energy efficiency and decarbonisation in eligible manufacturing sectors. Capital allowances (100 percent AIA on the first £1m) deliver up to around 25 percent effective tax relief in year one, and Climate Change Agreements provide Climate Change Levy discounts for energy-intensive sectors. We help you map and apply for the right combination, and we always point you to the current government guidance rather than quoting fixed figures that change with policy.

In most cases, no. Permitted Development Rights under Class A Part 14 of the GPDO 2015 cover rooftop PV on industrial buildings. Planning permission is required for listed buildings, conservation areas, or where panels project more than 200mm above the roof. We confirm planning status as part of the feasibility study.

Self-consumed solar replaces grid electricity at your full import rate, currently around 18 to 32p/kWh for industrial users, while any surplus earns 4 to 15p/kWh under SEG. For a typical 500 kW manufacturing install, expect £45,000 to £90,000 of annual bill reduction plus modest export income. Bills also become more predictable because a growing share of your electricity is generated at a fixed lifetime cost rather than exposed to wholesale spikes.

On its own, rooftop solar rarely covers all demand at an energy-intensive site; most installs offset 30 to 60 percent of annual consumption. The remainder is typically covered by a green PPA, on-site battery storage, or continued grid import. Combining rooftop PV with a corporate PPA on a remote solar farm is the most common route to a fully renewable supply for heavy industry.

Not for most sites with a daytime-heavy load profile, where self-consumption already maxes out. Battery storage becomes economic where you run significant night shifts, face heavy DUoS red-band charges, or want to trade flexibility in markets such as Dynamic Containment. We model the battery business case alongside the PV so you can see whether it pays.

Roughly 5 to 6 square metres of roof per kW of installed PV in 2026, using 450W-plus panels in portrait orientation with optimised row spacing. So a 500 kW system needs around 2,500 to 3,000 square metres of unobstructed roof. We run a 3D shading study to confirm, because rooftop plant, parapets and adjacent buildings can reduce usable area significantly.

Almost all commercial roof types: trapezoidal and profiled metal (clip or rail fix), standing-seam metal (clamp fix, no penetration), single-ply membrane (ballasted), built-up felt (mechanically fixed with flashing), and concrete (ballasted). Asbestos-cement roofs cannot be retrofitted with rooftop PV and must be replaced with a modern membrane first.

Through a PPA or asset finance. A power purchase agreement provides solar energy with zero capex; you pay per kWh consumed at a rate below your current grid tariff. Asset finance puts the system on balance sheet but spreads the cost over 7 to 15 years, and most projects are EBITDA-positive from year one. Operating leases are also available. We model each route against a cash purchase so you can compare like for like.

The standard metrics are simple payback, IRR (typically 12 to 22 percent for a UK manufacturing install), NPV at your own discount rate, and LCOE, which for manufacturing PV is usually 4 to 7p/kWh against 22 to 32p/kWh for grid retail. We share the full discounted-cash-flow model so your finance team can plug in their own assumptions.

Increasingly, yes, through their Scope 3 targets. JLR's Reimagine, Nestle's and Unilever's climate plans, and the major grocers' net-zero commitments all flow down to supplier requirements. EcoVadis, CDP Supply Chain and SBTi-validated targets are now common contract conditions, and on-site solar is one of the cleanest ways to demonstrate a Scope 2 reduction.

Panel performance is warranted for 25 years, typically at 84 percent output at year 25. Inverters are warranted 5 to 12 years and are replaced once during the system life. Mounting and DC cabling are warranted 25 years. Real-world system life is 30 to 35 years with one inverter replacement and routine cleaning and electrical inspection.

Yes, and this is one of the strongest economic cases for manufacturing sites. Daytime charging absorbs solar generation at 100 percent self-consumption. Electric forklift fleets, plant vehicles and staff or visitor EV chargers all stack well with on-site PV, and we frequently design the charging infrastructure alongside the array.

Through annual operations-and-maintenance visits covering electrical inspection, inverter firmware, and panel washing where needed, backed by 24/7 remote monitoring with automated underperformance alerts. Most clients sign a 10 to 25 year O&M contract, and typical O&M cost is £8 to £12 per kW per year for systems above 250 kW.

Under a PPA a third party owns and operates the system and you pay per kWh consumed, typically 20 to 40 percent below grid retail, with zero capex and off-balance-sheet treatment but no ownership. Under asset finance you own the system, financed over 7 to 15 years; payments are higher per kWh equivalent but you keep all the savings and own an asset that still has value at year 15.

If usage rises, your self-consumption rises with it and the economics improve. If usage falls, the surplus is exported and earns under SEG. The system continues to deliver value either way, and in the worst case of a site closure it can be relocated, sold to a successor occupier, or left in place under a transferred PPA.

No, when installed by an MCS-certified installer using approved fixings. We only use systems with manufacturer roof-warranty acceptance, and all penetrations are flashed to specification while ballasted systems on flat roofs need no penetrations at all. Our 10-year insurance-backed workmanship warranty covers any fixing-related water ingress.

Yes, decisively. Modern crystalline-silicon panels have an energy payback of 1 to 2 years in UK conditions and a carbon payback of 18 to 30 months. Over a 25-year life a UK manufacturing PV system displaces many times its embodied carbon. The IEA PVPS Task 12 lifecycle assessments are the most authoritative source.

Every kWh of self-consumed solar directly reduces your market-based and location-based Scope 2 emissions, and the generation data feeds straight into CDP, SBTi and EcoVadis submissions. For manufacturers under supply-chain pressure, an on-site array is one of the most visible and verifiable decarbonisation measures you can put in front of a customer audit.

In three steps: a free desk-based feasibility study from your half-hourly meter data and roof drawings, with a sized and priced proposal within 7 working days; an on-site survey with our structural and electrical engineers, usually a single day; then the DNO application and contract, which we begin within two weeks of signature. Most clients are generating their own solar within 6 to 9 months of the first call.