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The purpose of this paper is to investigate the environmental effects of the telecommunications usage, residential and business, by assessment of the changes in the energy consumption in Bulgaria during the period 1994-2018. Bulgaria is one of the EU countries with the largest decline in energy consumption during the last decades. Many factors influence the amount and efficiency of energy consumption. The present research is based on the assumption that telecommunications cause energy consumption. The change and the relationship between the indicators of the public telecommunication sector and those of the energy sector in Bulgaria are analyzed with the help of time-series analysis. With the help of the statistical analysis of time-series, the change and the relationship between the indicators of the public telecommunication sector and those of the Energy sector in Bulgaria for the period under review are analyzed. Some relationships between indicators have been explored through the capabilities of VAR-models. For the purpose of the analysis data from different information sources, including World Bank, ITU, National Statistical Institute of Bulgaria and Eurostat, are used. For the purpose of the analysis are used different information sources, including World Bank, ITU, National Statistical Institute of Bulgaria and Eurostat. The specific focus of the research is the growth of e-commerce as a result of telecommunication development, a factor for stimulating economic growth and thus energy consumption. The results of the survey can be used to evaluate and develop policies in the field of telecommunications and e-commerce. [ABSTRACT FROM AUTHOR]

The importance of this study is to underline the fact that the wind energy potential in the western part of the Black Sea basin can be considered significant, while the wave energy is lower in comparison with oceans. However, in winter time when energy consumption in Bulgaria and Romania is high, the wave energy presents the highest values. The aim of this research paper is to draw a comprehensive picture regarding the wave and wind energy near Bulgaria and Romania coastlines. More precisely, six locations were studied. Regarding the geographical location, the studied points are located in the range 42°N to 45.2°N and 27°E to 30°E as follows: three points are near to the Bulgaria’s coastline and the other three close to Romania’s coastline. In this study, the wind conditions were analyzed at 10-meter height. The data for the wind analysis were provided by the Regional Climate Model (RCM) from Euro-Cordex database (EUR-11) and covers three intervals. All intervals cover 30-year of data as follows: Historical dataset (01 January 1976 to 31 December 2005), near future RCP8.5 scenario (01 January 2021 to 31 December 2050) and future RCP8.5 scenario (01 January 2071 to 31 December 2100). The wave analysis was conducted on the same intervals but using data coming from SWAN model. Finally, by analyzing the resulted coming from this joint evaluation it can be concluded that the presented analysis provides a more comprehensive picture regarding the future wind and wave energy resources in the coastal environment of Bulgaria and Romania, compared with historical period. [ABSTRACT FROM AUTHOR]