*3.1. Sectoral Study of Greening the Economy in the Energy Industry*

Sectoral energy efficiency analysis includes a number of models, such as energy systems analysis (ENPEP, MESSAGE), energy and electricity demand (MAED, ENPEP), environmental impact of energy facilities (SimPacts, WASP-IV, ENPEP) and financial analysis of energy systems (FINPLAN). They are designed to analyse and forecast future energy needs and require time intervals to study the conditions and objectives of the countries where implementation is planned. Key conditions for the development of meaningful scenarios are: the application of systematic procedures to ensure the internal consistency of initial assumptions, especially those on social, economic and environmental factors, and a clear understanding of the dynamic nature of modelling, the interdependence among assumptions, the evaluation of results, plausibility criteria and changes to initial assumptions.

To model the sectoral development of the energy industry, this study used econometric methods of simulative modelling, in particular, the rapid diagnosis of the importance and share of innovative enterprises in the total number of industrial enterprises in Ukrainian regions. This study contained elements of cluster analysis and panel modelling as a justification for the relevance of the greening policy of national and regional ecosystems, taking into account the international status of Ukraine as a member of many international agreements and projects, including the European Green Deal [1], the transformation of coal regions (fair transition), the Paris Agreement [31] and the Climate Goals of Ukraine until 2030 [32].

The idea that the relationship between the greening of the energy sector of the national economy and the national security of the state (through energy security) is direct has been empirically substantiated. At the same time, the desire to liberalise the national energy sector will reduce the level of state influence as a regulator of ensuring the necessary level of greening of the energy sector, addressing the vast majority of energy security issues. State support for the development of "green energy" motivates companies to participate in eco-transformation.

Simultaneously, the input conditions for the current energy state of Ukraine, given energy integration and military action, are so unique that they require special elements of analysis that can effectively take them into account. This study uses a conceptual and analytical model of comprehensive support for the implementation of renewable energy, which can become an innovative component of the sustainable postwar economic development of Ukraine.
