Photovoltaic waste in the UK and Europe: how solar panels fail, the tonnes to expect by 2050 and what the WEEE regime can and cannot recycle

Abstract

1. Introduction

Solar panels are sold on a 25- or 30-year life, and the UK has only recently had panels old enough to test the claim. Before the feed-in tariff launched in 2010, solar was one per cent of UK renewable capacity; by the end of 2025 it was 33.6 per cent, according to the Department for Energy Security and Net Zero (DESNZ, 2026b). Capacity grew from 95 megawatts (MW) at the end of 2010 to 13,800 MW at the end of 2021, on the figures of DESNZ's predecessor department (BEIS, 2022), and to 21.9 GW at the end of 2025, up 12.8 per cent in the year (DESNZ, 2026a). The 2025 additions of 2.5 GW, the third highest on record, came from 269,000 installations, "the highest on record for any calendar year" (DESNZ, 2026b); there are now over two million installations (DESNZ, 2026c), policy is 45 to 47 GW by 2030 (DESNZ, 2025), and the world added 698 GW in 2025 (IEA-PVPS, 2026).

Every one of those panels will one day come down and become WEEE, which the producer must pay to collect and treat. The Department for Environment, Food and Rural Affairs (Defra) noted when setting 2026 targets that "we are now seeing the first generation of solar panels emerging as waste", and household PV collections jumped from 428 tonnes in 2024 to 1,677 tonnes in 2025 (Defra, 2026).

A companion article explains what a householder should do with a failed panel or inverter (What happens to old and faulty solar panels?). This paper is the quantitative treatment: a consolidated reading of the failure evidence, a Weibull projection of UK waste to 2050 checked against three independent forecasts, and an assessment of the legal regime and European recycling capacity against those volumes. Sections 2 to 7 cover the literature, method, findings, discussion (including UK small and medium-sized enterprises, SMEs), limitations and conclusions.

2. Literature review

2.1 How modules degrade and fail

Jordan et al. (2016) compiled about 11,000 degradation measurements from nearly 200 studies and found a median for crystalline silicon of 0.5 to 0.6 per cent of rated power a year, a mean of 0.8 to 0.9 per cent, and "a fairly linear decline". Degradation alone does not make a panel waste; failure, or a decision that it is no longer worth its roof space, does.

The IEA-PVPS (2014) review organises failures by age: infant failures, from a distributor's records of about two million modules, dominated by junction boxes, glass breakage, cell interconnects, loose frames and delamination, with transport damage causing five per cent of cases; mid-life failures led by interconnections and glass breakage, with two per cent of modules predicted to fail warranty at 11 to 12 years; and wear-out failures of delamination, cracked cells and discolouration, with power losses "between 0% and 20%, in the mean 10%".

The 2017 field assessment ranked failures by impact as "potential induced degradation, failure of bypass diodes, cell cracks, and discolouration of the encapsulant", with no strong correlation to climate zone; potential-induced degradation (PID) arises when high system voltage drives leakage currents through the glass and encapsulant, and delamination caused field losses of 11.5 to 20 per cent (IEA-PVPS, 2017). The 2021 risk report, on 226 degradation data sets, found that "PID effects, cell cracks and defective bypass diode failures seem to dominate the failure statistic in the first seven years", while glass breakage and soiling dominate sudden events (IEA-PVPS, 2021).

The inverter has a shorter life: the same report cites string-inverter reliability "between 8 (older devices) and 25 years (state-of-the-art inverters)" and, in a 20-year analysis of a 15.3 MW plant, a residual inverter reliability of 0.1 per cent (IEA-PVPS, 2021); many installations replace the inverter at least once (Pain and Murphy, 2025).

2.2 Projecting waste volumes

The foundational projection is the IRENA and IEA-PVPS (2016) study, which modelled losses with a Weibull distribution around a 30-year average lifetime and a 99.99 per cent probability of loss after 40 years. Its regular-loss scenario uses a shape factor of 5.3759; its early-loss scenario uses 2.4928 and adds fixed losses of 0.5 per cent in transport and installation, 0.5 per cent within two years, two per cent after ten years and four per cent after 15. Globally it projected 1.7 to 8 million tonnes of cumulative waste by 2030 and 60 to 78 million by 2050; its Table 6 gives UK figures of 30,000 to 200,000 tonnes by 2030 and 1.0 to 1.5 million by 2050.

Later work has revised the global figures upward: the IEA-PVPS (2025) cites IRENA's 1.5°C scenario of 4 million tonnes in 2030 and over 200 million by 2050. Nieto-Morone et al. (2023) re-ran the IRENA parameters with 2020 market data, replacing IRENA's projected 65 tonnes per MW with an observed 56.54, and projected UK cumulative waste of 32,167 tonnes (regular-loss) and 198,595 tonnes (early-loss) by 2030, rising to 1.49 and 2.04 million tonnes by 2050; the EU figure under regular loss is 16.2 million tonnes by 2050. Pain and Murphy (2025), modelling warranty expiry, within-warranty failure and early economic replacement instead of a Weibull, estimated that the UK's roughly 18 GW is about 70 million modules, that cumulative waste will exceed 15,000 tonnes by 2030 and 1.3 million by 2040, and that over 100 million modules, about 2 million tonnes, will have reached end of life by 2050; they warned that "UK annual PV waste alone may exceed" pan-European recycling capacity of about three million modules a year by 2035.

2.3 Composition, recycling technology and economics

A crystalline silicon panel is about 76 per cent glass, 10 per cent polymer, 8 per cent aluminium, 5 per cent silicon, 1 per cent copper and under 0.1 per cent silver (IRENA and IEA-PVPS, 2016). Frame and glass are easy and cheap; silicon and silver are laminated inside the polymer and are where the money is: "silver accounts for half of the material value but represents less than 1% of the module mass" (Walzberg, Carpenter and Heath, 2021).

The IEA-PVPS (2018) survey of 178 recycling patents classed the crystalline-silicon approaches as 40 per cent mechanical, 15 per cent thermal, 19 per cent chemical and 25 per cent combinations, and called delamination "the most difficult process and the most important target of recycling technology R&D". The EU-funded Full Recovery End-of-Life Photovoltaic (FRELP) process, assessed by the Joint Research Centre (JRC), combines manual dismantling, thermal glass separation, incineration of the polymer, acid leaching and electrolysis to recover 98 per cent of glass, 99 per cent of aluminium, 95 per cent of silicon, 99 per cent of copper and 94 per cent of silver, 908 kilograms per tonne (Latunussa et al., 2016). Heath et al. (2020) called for research to cut recycling costs and impacts relative to disposal while maximising recovery.

The economics remain adverse. Walzberg, Carpenter and Heath (2021) modelled the United States market with an initial recycling cost of US$28 per module against US$1.38 to landfill; at US$18 the recycling rate rises from 7.7 to 44 per cent, and recycling is profitable by 2050 only at US$21 or less. The IEA-PVPS (2025) describes "a high-cost, low-revenue scenario" of low volumes, limited commercial technology and undeveloped markets for recovered materials. Where recycling is financed it is by regulation: Italy withholds €12 per domestic module from feed-in tariff payments against end-of-life costs (IEA-PVPS, 2022).

2.4 The legal regime

PV panels came into EU scope with Directive 2012/19/EU, whose recital 9 says that for long-life products "such as photovoltaic panels, the best possible use should be made of existing collection and recovery systems" (European Parliament and Council, 2012). Panels sit in category 4, "Consumer equipment and photovoltaic panels", with targets of 85 per cent recovery and 80 per cent preparation for re-use and recycling by weight, and producers finance collection and treatment of household WEEE (Article 12) and of non-household WEEE from products sold after 13 August 2005 (Article 13). Across the EU, 5.2 million tonnes of WEEE were collected in 2023, a collection rate of 37.5 per cent (Eurostat, 2025). Ecodesign work on PV is under way: photovoltaic panels are in a transition period to 31 December 2026 under the 2025 to 2030 working plan (European Commission, 2025), the JRC has published harmonised carbon-footprint rules (Ardente et al., 2025), and a recyclability index is expected in 2026 (IEA-PVPS, 2025).

The UK transposed the directive through the WEEE Regulations 2013 (statutory instrument 2013/3113), amended in 2025: producers placing over five tonnes a year on the market join a compliance scheme that finances "the collection, treatment, recovery and environmentally sound disposal of household WEEE" (Environment Agency, 2025b). Panels are category 14 and "must be reported as household (B2C (business to consumer)) regardless of where they're installed" (Environment Agency, 2025a). PV CYCLE UK is an accredited scheme with collection points for holders of fewer than 30 panels and a collection service above that (PV CYCLE UK, n.d.).

3. Method

This is desk research on secondary data. Sources were taken in order of preference: UK statistical releases, EU legislation and Eurostat, IEA-PVPS and IRENA reports, then JRC and peer-reviewed studies. No trade-press figure is the sole source of a number.

3.1 Loss model

The probability that a panel has reached end of life by age t follows the two-parameter Weibull distribution used by IRENA and IEA-PVPS (2016) and Nieto-Morone et al. (2023):

Here F(t) is the cumulative probability that a panel is waste by age t in years, T is the scale parameter, set to the 30-year average lifetime, and α is the shape factor, 5.3759 for regular loss and 2.4928 for early loss. Both curves pass through 63.2 per cent at 30 years; at 20 years regular loss has reached 10.7 per cent and early loss 30.5 per cent. IRENA's early-loss scenario also layers fixed infant losses on top; this paper uses the pure Weibull so the scenarios differ in one parameter only.

Annual waste is the sum over installation cohorts of mass installed multiplied by the share of the cohort expected to fail that year:

Here W with subscript y is panel waste arising in year y in tonnes, P with subscript i is capacity installed in year i in MW, m with subscript i is panel mass per MW for that cohort, F is Equation 1 at the cohort's age with a half-year offset so that a year's failures are the difference of two cumulative probabilities, and C with subscript y is the cumulative total.

3.2 Inputs and assumptions

Capacity anchors are 95 MW at the end of 2010 and 13,800 MW at the end of 2021 (BEIS, 2022); 18.1 GW in March 2025 (House of Commons Library, 2025); 2.5 GW added in 2025 (DESNZ, 2026b); and 21.9 GW at the end of 2025 (DESNZ, 2026a), implying about 19.4 GW at the end of 2024. Small-scale capacity in Great Britain, 72 MW in 2010, 4,682 MW in 2016, 5,407 MW in 2020 and 9,362 MW in 2025 (DESNZ, 2026a), was interpolated linearly for the sub-50 kilowatt (kW) segment. The residual 7.7 GW of large-scale additions in 2011 to 2021 was assigned an assumed profile concentrated in 2013 to 2017, consistent with the Renewables Obligation closing to new applicants in March 2017 (BEIS, 2022) and with 2025's 2.5 GW being only the third highest addition on record (DESNZ, 2026b); 1.5, 2.0 and 2.1 GW were assumed for 2022 to 2024. Future additions follow policy: 4.82 GW a year to 46 GW in 2030, the midpoint of the 45 to 47 GW ambition (DESNZ, 2025), then 2.2 GW a year to the 90 GW 2050 target cited by Pain and Murphy (2025).

Mass per MW is 72 tonnes for cohorts installed before 2020, from Pain and Murphy's (2025) 70 million modules at 18.5 kilograms across about 18 GW, and 56.5 tonnes from 2020, following Nieto-Morone et al. (2023). Inverters, cabling and mounting are excluded, as is repowering before failure, which biases the regular-loss scenario low.

4. Findings

4.1 Failure modes by phase

Table 1 consolidates the failure evidence into the phases used by IRENA and IEA-PVPS (2016).

The highest-impact early failures, PID and bypass diodes, are electrical and show in monitoring before they become waste; wear-out cuts output by a mean of 10 per cent rather than stopping it, so when an old panel becomes "waste" is an economic decision; and inverter WEEE arises a decade before panel WEEE from the same roof.

Figure 1 plots Equation 1 against the phases. The curves diverge most between years 10 and 25; the UK's largest early cohorts, installed in 2014 to 2016, reach 20 years in 2034 to 2036, which is why the choice of scenario matters most for the 2030s.

4.2 UK waste volumes to 2050

Figure 2 and Table 2 give cumulative UK panel waste under both scenarios with the published projections.

The model sits within the published range at every point, partly because the parameters are shared, but the agreement checks the installation history in Section 3.2. The 2050 results exceed IRENA's because deployment has outrun its 2016 assumptions, and fall below Pain and Murphy's because that study adds early economic replacement.

Under regular loss, annual arisings grow from about 2,100 tonnes in 2025 to 30,700 in 2035 and double again by 2040 as the 2014 to 2016 cohorts reach the steep part of the curve; under early loss the flow is already 15,800 tonnes a year and grows more evenly. By the late 2040s the scenarios converge on about 120,000 tonnes a year, roughly 6.5 million modules at 18.5 kilograms, because by then almost every pre-2020 panel has been retired under either assumption.

4.3 Collections against arisings

Figure 3 compares reported collections with modelled arisings. Collections were 382 tonnes in 2022, 460 in 2023, 428 in 2024 and 1,677 in 2025, against a 2025 target of 519. The 2026 target is 1,845 tonnes, ten per cent above 2025 collections rather than the baseline method's 2,745, to avoid "unfair additional costs on producers" while infrastructure is built; panels are 0.35 per cent of the 532,882-tonne household WEEE target (Defra, 2026).

Two readings are possible. The 1,677 tonnes of 2025 is close to the regular-loss estimate of 2,100 tonnes, which would mean the UK captures most of what arises and early loss is not occurring at scale. Or arisings are nearer the early-loss 15,800 tonnes and nine-tenths of retired panels never reach the reported stream: stockpiled, exported, resold or treated as non-household waste despite the Environment Agency's rule. Defra's cited research puts 13,879 tonnes needing treatment by 2030 (Defra, 2026), between the scenarios. The evidence cannot yet separate the readings, which is itself a finding: the UK does not know its PV waste flow to within an order of magnitude.

4.4 European capacity and recovery rates

Europe is where UK panels will be treated for the foreseeable future; no UK plant appears in the IEA-PVPS (2025) survey. In 2022, 48,395 tonnes of PV module waste were collected across 18 European countries, 21,943 in Italy and 16,430 in Germany, at a reported recovery rate of 91.0 per cent, above the directive's 85. Named capacity is modest: Reiling at Münster can take up to 50,000 tonnes a year and processed 11,500 in 2024; First Solar at Frankfurt (Oder) handles 10,000 tonnes a year of its own cadmium-telluride modules; Solar Materials commissioned a plant of over 10,000 tonnes in 2025; and ROSI's pyrolysis plant near Grenoble recovers silicon at 99.9 to 99.999 per cent purity (IEA-PVPS, 2025).

Against Table 2, UK regular-loss arisings alone pass Reiling's 50,000 tonnes a year in 2038, and early-loss arisings in 2035, the year Pain and Murphy (2025) identified. The technology exists: FRELP recovered 95 per cent of silicon and 94 per cent of silver (Latunussa et al., 2016) and Reiling moved to industrial silicon recovery in 2025 (IEA-PVPS, 2025). What is missing is volume and revenue; the 91 per cent European rate is achieved mostly with glass, aluminium and copper.

5. Discussion

5.1 What the evidence shows

Panels degrade slowly and linearly; discrete failures cluster early (PID, diodes, cracks) and late (delamination, discolouration); and a 30-year Weibull with IRENA's shape factors reproduces both IRENA's figures and two independent UK forecasts. Cumulative waste of 1.4 to 1.8 million tonnes by 2050 is small beside the half a million tonnes of household WEEE the UK collects every year (Defra, 2026), but it is a stream only a handful of European plants can treat and whose value sits in a fraction of a per cent of its mass.

5.2 Comparison with the literature

The projections sit within IRENA and IEA-PVPS (2016) and Nieto-Morone et al. (2023) and below Pain and Murphy (2025), for explicable reasons: IRENA's deployment assumptions have been overtaken, Nieto-Morone use a lower mass per MW, and Pain and Murphy add economic repowering. On recycling the literature is unanimous: mass recovery is technically solved and financially unsolved. The cost gap of US$28 against US$1.38 per module (Walzberg, Carpenter and Heath, 2021) is why Italy withholds €12 a module and why Defra set its target below the baseline method.

5.3 Implications for UK policy

First, classifying all panels as household may hide most of the flow, since solar-farm decommissioning enters the same category as domestic roofs; collections should be reported against modelled arisings, with the collection rate as the target. Second, the 2026 target of 1,845 tonnes is below both scenarios for that year (3,000 and 18,200 tonnes). Third, the UK has no silicon or silver recovery and relies on European capacity its own arisings will exceed within about twelve years; since 85 per cent can be met with glass and aluminium, a policy that wants silver and silicon back needs a recyclability standard of the kind the EU is building into ecodesign (European Commission, 2025; IEA-PVPS, 2025). Fourth, inverter waste precedes panel waste by a decade and deserves its own accounting.

5.4 The strongest counter-argument

The case against concern: the tonnages are small, under three years of household WEEE spread over 25; the waste is benign, three-quarters glass, a tenth polymer and an aluminium frame; European recovery already exceeds 90 per cent and plants are expanding; producer responsibility puts the cost on manufacturers and importers, who price it into new panels; and panels retired at 20 years with 90 per cent output are re-usable.

The reply is that the argument is right about mass and wrong about value and timing. Glass and aluminium meet the target; silver and silicon do not, and the UK can recover neither. Producer responsibility finances collection of what is reported, and the gap between 1,677 tonnes collected and an early-loss 15,800 is either nothing or nine-tenths of the flow. And arisings stay low for most of the next decade and then rise more than tenfold, the profile that leaves infrastructure unbuilt until it is overwhelmed. Manageable is not the same as managed.

5.5 Implications for UK small and medium businesses

For an SME with panels on the roof, or considering them:

Monitoring is the cheapest failure control. The highest-impact early failures (IEA-PVPS, 2017, 2021) show as a step down in output long before they become waste; a firm that compares monthly generation year on year will catch them under warranty. Where monitoring runs through the firm's network or cloud accounts, our IT support service can include the inverter portal in routine checks.

Budget for the inverter, not the panels. With a reliability window of 8 to 25 years (IEA-PVPS, 2021) the inverter will fail within the panels' life; put its replacement in the asset register, and treat the old unit as WEEE.

Get the end-of-life paperwork at the start. Ask which compliance scheme finances the panels and keep the Microgeneration Certification Scheme (MCS) certificate; over 203,000 installations were certified in 2025 by mid-November, 1.85 million in total (MCS, 2025). Under 30 panels go to a PV CYCLE UK collection point; above that, a collection is arranged (PV CYCLE UK, n.d.).

Treat old panels as an asset decision, not a disposal. A wear-out panel at 90 per cent output (IEA-PVPS, 2014) may be worth keeping, reselling or replacing with a higher-output module; whichever, it is category 14 household WEEE wherever it was installed (Environment Agency, 2025a), and nothing goes in the skip.

6. Limitations

The model's largest uncertainty is the installation history between 2011 and 2021, anchored at two published points and shaped by assumption; the timing, though not the total, of the 2030s rise depends on it. Mass per MW comes from two studies rather than UK shipment data. The model excludes inverters, mounting and cabling, and economic repowering, which Pain and Murphy (2025) include; IRENA's fixed infant losses are not reproduced. UK collection figures are household category 14 tonnes reported by compliance schemes and may exclude exported or stockpiled panels. European capacity figures are those named in one survey, and recycling costs are 2021 United States dollars. The Jordan and Kurtz (2013) review, the 2017 Jordan et al. paper on degradation modes and the EU recyclability-index study could not be retrieved from a primary source and are not cited; the UK deployment and WEEE spreadsheets were used through their narrative releases.

7. Conclusion

PV modules fail in a predictable order: electrical faults and cracks in the first decade, delamination and discolouration after fifteen years, against a background degradation of about half a per cent a year and an inverter that will not last the course. A Weibull model with IRENA's parameters, fitted to UK deployment anchors, projects cumulative panel waste of 37,000 to 198,000 tonnes by 2030 and 1.4 to 1.8 million tonnes by 2050, in line with IRENA and two independent forecasts, with annual arisings rising more than tenfold between 2025 and 2035. Household collections of 1,677 tonnes in 2025 are consistent either with the regular-loss curve or with large under-reporting, and the regime cannot yet tell which. The WEEE framework obliges producers to pay, classifies every panel as household waste and sets an 85 per cent recovery target that European plants already exceed; it does not recover the silver and silicon that hold half the value, nor build capacity ahead of a flow that will exceed Europe's largest plant within about twelve years. The technology exists; the volumes, prices and policy signal to run it do not yet, and the UK's decade of low arisings is the time to arrange them.

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