Energy education of the younger generation, who are the future decision makers, investors, consumers, scientists, or skilled labor force in new energy technologies, is crucial for the future of Europe and the world. However, beyond the long-term goals of energy education policies, the short-term effects on energy conservation and the promotion of renewable energy sources are equally as important. The main purpose of the paper is to identify and analyze the behavior of students (who study the issues related to energy saving and RES), in terms of energy conservation. The conducted analysis focused on examining and comparing the scope of responses of the surveyed students in individual countries, especially in the Czech Republic, Poland, and Ukraine. The survey was carried out using the computer-assisted web interview (CAWI). Descriptive and graphical methods were used to present the results. Statistical analysis of the collected data included basic measures of descriptive statistics and the chi-square test. The main results of the study are as follows: Almost 60% of the surveyed students follow the principles of energy conservation; however increased educational activities on eco-energy behaviors is recommended. The share of RES in the heating systems of the studied residential buildings is 9%, on average, with the highest percentage of houses in Poland (14%) and the lowest in Ukraine (only 2.6%). When compared with literature reports, the collect data show that educational activities can be as effective as a tool in implementing RES and pro-environmental behaviors as the government’s environmental policy and household subsidies.