Aerospace & Defence Manufacturing: Solar Panels for Manufacturing

Aerospace and defence manufacturing carries an electrical load that few other sectors match for solar suitability. Autoclaves curing composite structures, five-axis CNC machining centres, surface-treatment lines and environmental test cells draw a heavy, daytime-weighted demand that peaks precisely when the sun is highest. That load profile is the reason on-site solar works so well here: the power you generate at midday is consumed on the shop floor at midday, at your full import rate, rather than spilled cheaply to the grid. On top of the technical fit, the commercial case is unusually sharp. When Rolls-Royce, Airbus and BAE Systems flow their net-zero commitments down through the supply chain, an on-site array stops being a nice-to-have and becomes a documented contract advantage. And because aerospace and defence work is high-value and precision-driven, the price certainty that solar brings to a large slice of the energy budget is worth more to this sector than to almost any other. Large clear-span assembly halls complete the picture, offering the kind of uninterrupted roof area that makes a well-designed system straightforward to lay out.

Sizing solar for aerospace and defence manufacturing

A typical aerospace or defence manufacturing site takes a system of 300 to 1,500 kW, which is roughly 550 to 2,750 panels spread across 1,800 to 9,000 square metres of roof. A system in that range generates in the region of 275,000 to 1,380,000 kWh a year, which for most sites offsets a meaningful share of daytime demand from machining, treatment and test loads.

We do not size from roof area or from an annual average. We size from twelve months of half-hourly meter data, modelled shift by shift, so the array is matched to your genuine daytime baseload rather than to the space available. The working rule for manufacturing is to install 70 to 90 percent of peak daytime demand, which maximises self-consumption and avoids exporting cheap power you could have used yourself. Autoclave cycles, test-cell runs and shift patterns all show up in the half-hourly data, and they are exactly the detail that determines the right system size. Battery storage enters the model where night shifts run or where network charges are heavy, and we show you whether it pays rather than assuming it.

Costs and payback

A typical aerospace and defence manufacturing installation lands between £240,000 and £1,200,000 fully installed, tracking the 300 to 1,500 kW range above. Simple payback for this sector is around 5.5 years, driven by the strong daytime self-consumption that autoclaves, machining and test loads deliver. Most of this expenditure is fully written down in year one under the Annual Investment Allowance, which improves the effective cost further.

Figure	Typical range
System size	300 to 1,500 kW
Number of panels	550 to 2,750
Roof area required	1,800 to 9,000 sqm
Annual generation	275,000 to 1,380,000 kWh
Installed cost	£240,000 to £1,200,000
Simple payback	Around 5.5 years

We model your payback from your own half-hourly data and share the full discounted-cash-flow model, so your finance team can stress-test it or feed it straight into your capital-appraisal process. See our cost guide for how the numbers break down.

Compliance and regulation

Aerospace and defence sites run under quality regimes that shape how every project is documented. AS9100 and the SC21 supply-chain excellence programme set the expectations for traceability and paperwork, so we document survey, design and commissioning to a standard your quality team will recognise. Many sites are security-cleared, which can restrict roof access and rule out aerial or drone surveys, so we agree the survey method up front rather than turning up with a drone and being turned away at the gate.

Autoclave and test-rig resilience is planned through the single grid-connection outage the project needs, so no curing cycle or test programme is put at risk. Export-control awareness applies on some sites, and we work within your existing controls rather than around them. Alongside these sector-specific points, the standard manufacturing requirements still apply: MCS commercial certification for export eligibility, a G99 application for connections above 17 kW per phase, CDM 2015 for any sizeable install, and a structural survey before any load goes on the roof.

A representative project

Consider a Midlands precision manufacturer supplying structural components to a Tier-1 aerospace OEM. The site runs autoclaves, a bank of five-axis machining centres and a small environmental test facility on a two-shift pattern, giving a heavy, daytime-weighted load. A clear-span assembly hall offers around 5,500 square metres of usable roof. Working from twelve months of half-hourly meter data, the right size lands at roughly 800 kW (about 1,470 panels), generating in the region of 730,000 kWh a year. At an installed cost near the middle of the £240,000 to £1,200,000 band, the project pays back in around 5.5 years. Because the site is security-cleared, the survey is carried out on foot with no drone flights, the single grid-connection outage is scheduled inside a planned maintenance window to protect autoclave cycles, and the generation data feeds straight into the OEM supplier scorecard as evidence of a Scope 2 reduction. These figures are a representative model for this sector, not a named client, and your own project would be sized from your own meter data.

Funding the project

Most aerospace and defence installs are funded through a PPA or asset finance rather than capital, so the roof does not have to compete with production-line investment. The Industrial Energy Transformation Fund can support larger decarbonisation projects, the Annual Investment Allowance typically writes down the first million pounds of spend in year one, and Climate Change Agreements can improve the levy position on energy-intensive sites. Our grants and funding guide maps the schemes to your situation, and the cost guide compares cash, PPA and asset finance side by side.

The next step is a free feasibility study from your half-hourly meter data and roof drawings, with a sized and priced proposal in return. Request a quote to begin, or use our savings calculator to see an indicative figure first. If your operation spans more than one discipline, our pages on solar for engineering and metalworking and electronics manufacturing cover the load profiles and compliance points that matter to those sub-sectors.