Are solar panels bad for the environment?

Updated October 24, 2026

General information, not a substitute for the advice of an attorney.

Short answer: The two things critics raise most are manufacturing emissions and what happens to panels at end of life. On emissions, NREL's harmonization of published life-cycle studies found median greenhouse gas emissions for both crystalline silicon and thin-film PV "below 50 g CO2e/kWh," counting manufacturing, operation, and disposal (NREL, Life Cycle Greenhouse Gas Emissions from Solar Photovoltaics). On end of life, EPA states that "toxic metals like lead and cadmium may also be present in solar panels" and describes recycling routes for both silicon and cadmium-telluride panels (EPA, Solar Panel Recycling). This is a contested question; we present the record and no verdict.

Life-cycle emissions

NREL reviewed 17 studies providing 46 estimates (41 for crystalline silicon from 13 references, 5 for thin film from 5) and harmonized them to common assumptions; the medians for both PV types came in below 50 g CO2e per kWh (NREL).
Those emissions occur mostly before the panel is installed, in materials and manufacturing; operation adds none from fuel, since a PV cell has no moving parts and burns nothing (EIA).
We did not open a current grid-average emissions figure this session, so we do not state the comparison in numbers here. Fossil generation figures are published by EIA and can be set beside the NREL number.

End of life and toxic content

EPA's guidance names lead and cadmium as metals that may be present, and notes that cadmium-telluride thin-film panels are recycled to recover cadmium and tellurium (EPA). EPA also cites an IRENA estimate that recoverable raw materials from end-of-life panels will be worth about $450 million by 2030, equivalent to the raw materials in about 60 million new panels (EPA). Whether a given panel is hazardous waste is determined by testing under federal rules; EPA's page on panel waste regulation covers that process, and we address decommissioning and panel lifetime in how long solar panels last.

Land

Utility-scale solar uses land that was often farmed or grazed; how much, and what happens to it afterward, is covered in how many acres a solar farm needs. Rooftop systems use none.

What is genuinely unsettled

How the life-cycle number shifts as manufacturing moves between grids with different fuel mixes; what share of retired panels will actually reach a recycler rather than a landfill; and how to value farmland converted for 25 to 35 years. The sources above establish the ranges, not the outcome.

See how long solar panels last, how many acres a solar farm needs, rooftop solar by state, and the permit finder.