- IEA PVPS Task 12 (PV Sustainability Activities) has released an updated Fact Sheet, shedding light on the environmental impacts of photovoltaic (PV) electricity.
- This Fact Sheet, titled “Environmental Life Cycle Assessment of Electricity from PV Systems“, offers crucial insights into PV sustainability and highlights key advancements as well as current data in PV technology.
Life Cycle Assessment: A Comprehensive Overview
Life Cycle Assessment (LCA) is a detailed method used to quantify and assess the material and energy flows, as well as emissions, throughout the life cycle stages of PV systems. These stages include manufacturing, transport, installation, use, and end-of-life. The manufacturing phase encompasses resource extraction, raw material production, and the creation of wafers, cells, panels, inverters, and mounting structures. Transport covers the distribution logistics, while installation involves setting up roof-mounted systems and cabling. The use phase evaluates the system’s performance over a typical 30-year operational period, including maintenance. Finally, the end-of-life stage addresses dismantling, recycling, and waste management processes.
The updated Fact Sheet primarily focuses on a typical residential PV system in Europe. This system is defined by a roof-mounted PV setup, an annual production rate of 976 kWh/kW, and an in-plane irradiation of 1,331 kWh/m². It includes PV panels, cabling, mounting structure, inverter, and installation, with a linear degradation rate of 0.7% per year and a service life of 30 years for panels and 15 years for inverters.
Evaluating PV Module Technologies
IEA PVPS Task 12 assesses four PV module technologies, each with distinct efficiencies: Cadmium-Telluride (CdTe) at 18.4%, Copper-Indium-Gallium-Selenide (CIS/CIGS) at 17.0%, Multi-crystalline Silicon (multi-Si, BSF) at 18.0%, and Mono-crystalline Silicon (mono-Si, PERC/TOPCon) at 20.9%. These efficiencies are critical in determining the environmental impacts and performance of each technology.
Key Findings from the Fact Sheet
Non-renewable energy payback time (NREPBT) is the period required for a renewable energy system to generate an amount of energy equivalent to the non-renewable energy used in its production. The study reveals an NREPBT of approximately one year for the evaluated PV systems, indicating a swift return on energy investment.
PV systems dramatically reduce greenhouse gas emissions compared to fossil fuel generators. The carbon footprint for producing 1 kWh of solar electricity ranges from 25.2 to 43.6 g CO2 equivalent, far lower than the up to 1 kg CO2 per kWh emitted by fossil fuels. The study also examines additional environmental impacts, including resource use of fossil fuels (0.35 to 0.52 MJ per kWh), resource use of minerals and metals (4.6 to 5.3 mg Sb equivalent per kWh), particulate matter (1.0 to 4.0 incidences per kWh), and acidification (0.18 to 0.36 mmol H+ equivalent per kWh).
When comparing current data with previous years, the study highlights significant reductions in greenhouse gas emissions by up to 17% in some technologies, thanks to improvements in manufacturing and an increase in module efficiency.
Conclusion
The detailed life cycle assessment methodology employed in this study provides valuable insights into the entire life cycle of PV systems, from manufacturing to end-of-life management. This holistic approach ensures that all environmental impacts are considered, enabling more informed decision-making for both policymakers and industry stakeholders.
Please download the Fact Sheet here.
Source: IEA PVPS Task 12
IEA PVPS Task 12 aims to quantify the environmental profile of PV systems relative to other energy technologies and address critical environmental, health, safety, and sustainability issues to support market growth.
For further information please contact the IEA PVPS Task 12 Managers: Garvin Heath and Etienne Drahi.
This article was originally published in pv magazine and is republished with permission.
