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Energy sectors of all the countries around the world are faced with a big challenge: the energy transition under the imperative of continuous reduction of carbon dioxide emissions. The energy transition and the sustainability constraints pose a significant challenge for engineers, researcher and scientists developing new and clean energy-efficient technologies. Energy production and transformations, along with its storage, distribution and consumption, are achieved by utilising new and clean energy technologies, with the goal of the continuous increase of energy efficiency, the growth of renewable energy sources utilisation, the uninterrupted switch from fossil fuels to alternative energy sources, and the continued reduction of CO2 emissions. This editorial paper addresses the latest progress and the findings in research and developments in the sustainable energy technologies, energy and environment systems from selected papers of the conference on Sustainable Development of Energy, Water and Environment Systems held in 2019. [ABSTRACT FROM AUTHOR]

• Method for measuring progress towards accessible, green and efficient energy. • Evaluation relative to idiosyncratic parameters (targets and thresholds). • Multidimensional and flexible approach to evaluate access and use of energy. • Empirical analysis of 157 countries relative to Sustainable Development Goal 7. • Positive dynamics across the world but still much to be done. This paper presents an index to evaluate progress in achieving the key dimensions of the Sustainable Development Goal 7, which entails ensuring "access to affordable, sustainable and modern energy for all." The key aspects of this index, called the Inclusive Green Energy index, are: (i) it focuses on changes, rather than on levels, of the access, greenness and use of energy; (ii) it exhibits a decomposability feature that permits integrating several dimensions, both positive and negative, in a friendly way; and (iii) the evaluation of progress is made relative to some reference values (targets and thresholds) that can differ between countries. We calculate the Inclusive Green Energy index of progress for 157 countries using data from 2004 to 2014 on three indicators intended to capture inclusiveness, greenness, and efficiency of energy use. The results show that progress has, on average, been positive across the world, with more than 87 per cent of the sample of countries experiencing some degree of progress. However, progress is smaller for the Middle East and North African and Sub-Saharan African countries and it is negative for most of the countries that exhibit low levels of human development, as measured by the Human Development Index. Furthermore, fewer than one in four of the countries in the sample have an Inclusive Green Energy index commensurate with having met their targets. This suggests that much remains to be done globally with regard to being on track towards meeting their Sustainable Development Goal 7 by 2030. [ABSTRACT FROM AUTHOR]