Solar Energy UK sets out domestic supply chain plan

Solar Energy UK has published a fresh package of policy recommendations and practical guidance aimed at strengthening Britain’s domestic solar and battery storage supply chain, shifting the discussion beyond deployment targets and towards the industrial base needed to support them.

The trade body says the UK’s solar and battery storage sectors currently contribute £1.9 billion to the economy and could reach £5 billion by 2035. At the same time, it argues that a large share of expenditure on hardware still flows overseas. Its recommendations focus on expanding capability in areas such as cables, batteries, inverters, and supporting structures, alongside broader support for research, innovation, and supply-chain development.

The package has two linked parts. The first is a policy paper that calls for a supply chain capability assessment modelled on the approach taken in offshore wind, together with clearer visibility on the project pipeline beyond the Clean Power 2030 deadline. The second is a practical guide aimed at businesses already active in the market, companies looking to enter the solar supply chain, overseas manufacturers considering the UK, and innovation-led SMEs seeking routes into commercial deployment.

That guide places solar growth within a wider industrial expansion cycle. It says UK solar capacity is set to double over the next four years, with further growth beyond that period. The immediate implication is that the supply chain discussion cannot be confined to modules alone. The larger opportunity sits across the rest of the electrical and structural package: mounting systems, wiring and cable management, power electronics, storage assemblies, control systems, and the services needed to design, install, and maintain them.

In practice, that broadening of the debate is overdue. Britain may not be able to recreate every step of the global module supply chain domestically, but there is a more realistic opening in the balance-of-system components and specialist engineering that sit around generation and storage projects. Those are the parts of the market where UK manufacturing, fabrication, installation capability, and technical services already have a foothold.

The recommendations also arrive at a point when resilience has become harder to separate from energy policy. The case being made is not only about creating more economic value at home, but about reducing exposure to disruption in international markets, improving project certainty, and aligning deployment growth with a stronger domestic industrial base. That is a more practical proposition than a narrow local-content argument, because it connects procurement, energy security, and engineering capacity in the same frame.

There is a timing issue as well. Companies invest when they can see an order book forming, and scale when they believe that visibility will last. For that reason, long-term pipeline clarity may prove just as important as grants or specific tax measures. A manufacturer considering investment in cable assemblies, inverter integration, or battery-related production will judge the market less on one year’s installation figures than on whether the policy environment gives enough confidence to expand.

Solar Energy UK has published both the policy paper and its market guide online, and together they mark a shift in tone. The sector is no longer talking only about how much solar the UK should build. It is asking how much of the associated industrial value it intends to keep. The policy recommendations are available here, and the guide, Growing the UK Solar Supply Chain, is available directly for businesses assessing their next move.