Solar panel recycling at end-of-life: UK farm guide

When UK farm solar PV systems reach end-of-life (typically year 25-30), the panels must be recycled rather than sent to general waste. Understanding the recycling framework now — and planning the decommissioning approach — protects long-term system economics and ensures compliance with UK WEEE regulations.

What’s in a solar panel

Modern UK solar panels contain: silicon semiconductor wafers (~5% by mass); aluminium frame (~10%); tempered glass front face (~70%); polymer encapsulants — EVA or similar (~5%); copper conductor (~1%); silver busbar metallisation (~0.1%); junction box components including bypass diodes (~0.5%); cell-to-cell tabbing materials, anti-reflective coatings, polymer backsheet.

The aluminium and glass make up the largest mass fractions and are easily recycled at standard facilities. Silicon and silver can be recovered with specialised processing. The polymer encapsulants are the challenging recycling stream — most current processes either thermally process them or chemically separate them.

UK regulatory framework

The Waste Electrical and Electronic Equipment (WEEE) Regulations 2013 (and subsequent amendments) classify solar panels as B2B WEEE. Disposal must follow specific protocols: collection only via authorised WEEE collection facilities; transport only via registered hazardous waste carriers; waste consignment notes required for any disposal above small quantities; manufacturer take-back schemes available for some brands.

For commercial farm installations above approximately 50 panels (typical 25 kW+), proper WEEE handling is non-negotiable. Disposing of panels to general waste is illegal and can result in significant fines.

Manufacturer take-back schemes

Several major panel manufacturers operate UK take-back arrangements: REC Group via partner recycling facilities; First Solar (for their thin-film panels); LONGi (developing UK take-back partnerships through 2025-2026); JA Solar (developing UK take-back); Trina Solar (developing UK take-back).

For panels not covered by manufacturer take-back, PV CYCLE UK (the industry recycling body) operates a network of collection facilities across the country. PV CYCLE membership for installers and producers funds the recycling infrastructure.

Material recovery rates

Modern UK PV panel recycling achieves: 95%+ recovery of aluminium and glass; 80%+ recovery of silicon (with potential for re-use in lower-grade applications); 90%+ recovery of copper; 75-90% recovery of silver. The polymer encapsulant fraction is the most challenging — current commercial processes recover energy via thermal treatment rather than recovering polymer for re-use.

Overall mass recovery rates from modern PV recycling: 80-90% of panel mass becomes recoverable raw material rather than landfill.

Practical decommissioning process

For farms reaching system end-of-life (year 25-30):

1. Engage an OEM take-back scheme or a registered WEEE collection facility (typically 6-12 month lead time on commercial-scale collection).

2. Disconnect and de-energise the system following BS 7671 procedures (typically requires the original installer or a qualified electrical contractor).

3. Remove panels from racking; package for collection on standard transport pallets.

4. Transport via registered carrier to recycling facility.

5. Receive waste consignment notes confirming proper disposal.

6. Restore the building roof (if doing full decommissioning) or prepare for re-powering.

Cost in 2026 prices

Decommissioning cost typically: £40-£80 per panel for rooftop installations (panel removal, transport, recycling, structural make-good); £8-£15 per panel for ground-mount (lower removal cost per panel due to scale efficiency); £30,000-£60,000 for a typical 250 kW farm install (rooftop, full decommissioning).

For re-powering (replacing panels with new ones while reusing racking, cabling, mounts), decommissioning cost is partially offset by re-powering capex — typically £25-£40 per panel removed (since the racking remains and the structural work is minimal).

Re-powering vs full decommissioning at end-of-life

At year 25-30, the question becomes: re-power (new panels on existing racking) or fully decommission (remove everything)?

Re-powering: new panels typically generate 40-60% more kWh than the original panels (efficiency improvements over 25 years are substantial); capex typically 50-60% of original system cost; extends operational life by another 25-30 years.

For most farm installations approaching year 25, re-powering will be the economic choice — the building still serves the operation, the racking is largely intact, and new panels deliver substantially more generation per square metre of roof.

What to plan for in 2026 commissioning

If you’re commissioning a system in 2025-2030, end-of-life is in 2050-2060. Plan for it conservatively in 25-year financial models: assume 50% of original capex required for re-powering at year 25, with new generation 40% higher than original — usually a clearly positive NPV decision. The decommissioning cost in 25 years time will likely be lower than today’s prices (as recycling infrastructure scales) — but conservative planning treats it at today’s prices.