The Ukrainian energy sector is one of the most inflexible energy sectors in the world as a result of the almost complete depreciation of the equipment of the main sources of power supply: nuclear, thermal, and hydropower. In connection with existing problems, there is a need to develop and use new energy-saving technologies based on renewable energy sources. In this proposed research, a regression model of renewable energy growth in the energy sector of Ukraine was developed. The studied literature reveals that the independent use of individual functioning elements of renewable energy sources function as the primary power source that is not an optimal solution for stable energy supply. This study proposes the use of hybrid renewable energy systems, namely a combination of two or more renewable energy sources that will help each other to achieve higher energy efficiency, accelerate the growth of renewable energy in the share of the Ukrainian energy sector and/or improve functioning with battery energy storages. Moreover, the use of hybrid renewable energy systems in Ukraine will reduce the human impact on the environment, realize the potential of local renewable energy resources and also increase the share of electricity generation from renewable energy sources. Therefore, mechanisms for managing state regulation of stimulating the development of hybrid renewable energy systems have been developed.
In a global economic competition, the countries that provide favorable conditions for efficient investment and innovation are winning. At the same time, the problem of sufficient investment support for enterprises, which, in turn, can be solved by economic and mathematical modeling of the investment management process becomes especially relevant. In this regard, the purpose of our study is to develop an algorithm for making the optimal decision on the feasibility of implementing a particular innovation project based on the calculation of optimization models of investment management. To achieve this goal, the following methods of scientific research were used: economic-mathematical modeling, abstract-logical method, graphical method. According to the results of the research, the decision-making algorithm on the feasibility of implementing a particular innovation project can be used by entrepreneurs-innovators to plan, forecast, control production processes, cash, material, and investment flows at the enterprise, as well as to determine the necessary financial capabilities, efficiency, risk innovative project.
The idea of inhancing competitiveness of the national economy was developed in the article from the position of improving energy efficiency and diversifying energy supply sources in rural areas, considering promising directions of development. Current situation in the country was analyzed, and comparisons with European countries were made, promising ways of sustainable rural development were determined, connected with the creation and improvement of the existing tools for using renewable energy sources. Particular attention was paid to the analysis and development of concepts of optimal models for complex utilization of renewable energy sources at the local level. Practical recommendations for introduction of renewable energy sources for energy supply in rural areas were developed. The necessity in deepening Goverment system measures to stimulate and support energy efficiency and the utilization of renewable energy sources was proven, as well as priority directions for the implementation of corresponding projects were identified. The necessity and peculiarities of the ways of diversifying energy supply sources for rural territories were studied. The concept and practical recommendations for utilization of biomass as the most promising type of renewable energy sources in rural areas of Ukraine were developed.
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