oday, the energy sector is characterized by a high degree of unsustainability in terms of
sources and supply systems, infrastructure, and policies, including climate policy. Therefore, it is
necessary to strengthen the functions of planning and to implement new energy strategies, which
should lead to the sector’s sustainability in the environmental, social, and economic dimensions. In
this context, the aim of the article is to develop a model for the sustainability assessment process
and to use it as a benchmarking framework for sustainability assessment indices used in energy
problems. The study included 14 indices to assess various aspects of sustainable development. The
indices were tested in terms of their sustainability dimensions, data sources, data normalization
methods, index aggregation methods, and other elements of the sustainability assessment process.
As a result of the research, it was found that none of the analyzed indices meet all the requirements
for indices that are to be used for the assessment of sustainability. Therefore, the use of these indices
in research problems related to energy sustainability requires a conscious analysis of their features
and adaptation to specific research problems related to energy sustainability.