By Eva Marešová (Czech Republic)
Renewable energy sources, especially electricity production via photovoltaic panels, are be-coming increasingly competitive with conventional energy sources and represent a promis-ing option for decentralized energy supply. Nevertheless, a careful evaluation of the actual location of e.g. a PV panel is still needed as efficiency and overall performance is highly in-fluenced by the exposure to sunlight. Thus, the identification of suitable roof surfaces within cities is attracting increasing attention of planners and researchers in recent years. These systems can contribute to self-sufficiency and decrease greenhouse gases emissions in urban areas while making use of so far unused surfaces. The aim of this study is to calculate solar potential of roofs in Wageningen, their suitability for installation of photovoltaic systems, assessment of the impact of trees shading on the overall potential and uncertainty arising from different ways of roof outlines detection.
Yearly photovoltaic potential was calculated with the ESRI ArcGIS Solar Analyst tool using LIDAR, cadastral and meteorological data and LIDAR-based outlines were derived for com-parison with cadaster outlines.
82% of LIDAR based footprints were in good agreement with data from the building cadas-ter. Assuming only 75% of all roof surfaces are usable for PV installation, 2/3 of yearly con-sumption of Wageningen could be covered. Tree shading has a negative effect of 21% in less vegetated areas and 43,5% in more vegetated areas in comparison to a situation without vegetation.
The outcomes of this study can be used for planning where to install PV with which priority and eventually meet the ambition of the municipality of Wageningen to become climate neutral in 2030. Based on the current results, a considerable proportion of Wageningen can be classified as self-sufficient or nearly self-sufficient on a yearly base in terms of electricity supply.