The aim of this paper is to present the transformation of the network tariff system in Slovenia using a comprehensive assessment methodology for the techno-economic evaluation of electricity costs for households. The novelty of the proposed approach lies in the combined assessment of the previous and new network tariff systems, explicitly accounting for power-based network tariff components, time-block-dependent charges, and different support schemes for household photovoltaic systems, including net metering and credit note-based schemes. The results show that the transition from an energy-based to a more power-based network tariff system, introduced primarily to mitigate congestion in distribution networks, is not inherently disadvantageous for consumers and prosumers. When tariff structures are appropriately designed, the new framework can support efficient grid utilization and maintain favorable conditions for prosumers, particularly those integrating battery storage systems. Overall, the proposed methodology provides a transparent and robust framework for evaluating the economic impacts of network tariff reforms on residential consumers and prosumers, offering relevant insights for tariff design and the development of future low-carbon household energy systems.

This paper evaluates the impact of a floating photovoltaic system on lake temperature using a one-dimensional thermal model. The modeling approach incorporates established heat flux formulations and lake temperature dynamics, utilizing key meteorological inputs such as power density of solar radiation, wind speed, air temperature, humidity, and precipitation. The model analyzes temperature variations at different depths under various floating photovoltaic system coverage scenarios and compares them to a reference case without a floating photovoltaic system. The results indicate that a floating photovoltaic system affects the lake’s thermal regime by enhancing cooling during warmer months and limiting heat loss in colder periods. A floating photovoltaic system also alters latent heat flux and evaporation, further affecting the lake’s energy balance and stratification. These findings highlight the importance of considering FPV-related thermal effects in environmental assessments.