The research is focused to development of both fundamental knowledge and applications of electrical power engineering. Studies on scientific projects include collaboration with industry, national institutions, electric utilities, and many foreign universities. General objective of the research is to develop methodologies for quantitative assessment of the environmental impact of applicable energy technologies (electric power producing plants and their technology chains), as a base for estimating optimal long-term development strategy of the power system. Research work includes new strategies of energy sector and power system development; preparing medium and long-term electricity generation expansion plan for power system; comparison of energy, economic and environmental characteristics of different options for electric power generation; studies for rational use of energy and energy savings. Research work also includes renewable energy sources and its role in power sector, as well as electricity production considering cap on CO2 emissions. Recent research covers development of new models for power system generation optimization and planning under uncertainties of the open electricity market. The research is currently focused on establishing appropriate changes in the methods and approaches in the power system expansion planning process under new, competitive environment. The main research directions are to analyze technical, economic and environmental aspects of various electricity generation technologies, examine the role and support mechanisms for renewable energy within a liberalized market, develop power system planning methods under uncertain conditions, and examine the role of decentralized energy sources in increasing power supply reliability and efficiency and sustainable development Expertise includes the following topics: sustainable power system planning; environmental impacts of electricity generation; electricity market liberalization; emission trading schemes (ETS) renewable energy sources, energy demand analysis, green certificates, energy conservation and energy auditing in industry. The main framework for the research are: "Sustainable electricity generation on a liberalized market"; „Modelling ETS and electricity market“;”Power system optimization with emission trading“ „Introduction of the first Nuclear power plant“; “Energy Security and Climate Changes“; System for Monitoring and Verification of Energy Management in Cities (IISEMC).