Peruvian Workshop on Solar Energy 2023 (JOPES 2023) These proceedings contain a selection of papers presented at the Peruvian Workshop on Solar Energy 2023 (Jornadas Peruanas de Energía Solar - JOPES), held for the sixth consecutive year. The motivation for these events dates back to 1981, when Prof. Manfred Horn began exploring the potential of renewable energies, particularly solar energy. He founded the Peruvian Association for Solar Energy and Environment (APES). A significant milestone occurred in 1986 when APES organized the first Peruvian Symposium on Solar Energy (SPES). Since 2003, SPES has been held annually without interruption, rotating among various cities in Peru with active university programs related to renewable energies. As an extension of these efforts, JOPES was established in 2008 to promote both local and international dissemination and exchange of ideas in the field of renewable energy research. We invite renowned keynote speakers, local researchers, and students to present their latest works. During the pandemic years of 2020-2022, the event continued virtually. JOPES 2023 was held in presential mode from July 20th to 22nd at the main auditorium of the Faculty of Sciences of the National University of Engineering (Universidad Nacional de Ingeniería, UNI). Keynote speakers from diverse countries, including Argentina, Brazil, Chile, France, Sweden, and the United Kingdom, participated. Numerous local researchers also contributed, covering topics such as bioremediation of polluted waters, FMEA risk evaluation in the design of solar cookers, properties of stable faces of SnO2 for improving solar cell production, Peltier cells for evaluating the thermal conductivity of insulating materials, calibration of a built spectrometer, and determination of cloud optical depths during over-irradiance. We would like to express our gratitude to the authorities of UNI for their support in making this event possible, especially the Faculty of Sciences for providing the venue and the Vice-Rectorate of Investigation (VRI) for covering some of the finances. Special thanks also go to the Peruvian Association of Solar Energy and the Environment (APES), the Renewable Energy Center of the National University of Engineering (CER-UNI), and the Peruvian government’s National Council of Science, Technology, and Technological Innovation (CONCYTEC). List of Organizing Committee is available in this Pdf.