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Energy efficiency is the central focus of energy policies in many countries, and it is also at the forefront of the debate on energy sustainability. To further understand the research frontiers in the energy efficiency field, this paper utilizes a bibliometric analysis with the help of visualization tools: CiteSpace and VOSviewer. The relevant literature during 2010-2020 is collected with the retrieval formulas from the Web of Science Core Collection. Firstly, this paper analyzes the annual indicators, research areas, productive institutions, authors, and journals of publications to comprehend the temporal and spatial distribution characteristics of the energy efficiency literature. Meanwhile, this paper identifies the productive institutions and authors and the influential journals. Then, we construct the collaboration networks among countries/regions/insti tutions, references, and authors to know the collaborative relationships. By analyzing the keywords from highly cited papers with clustering, timeline view, and time zone view, the trend of changes is grasped over time in the energy efficiency literature. Finally, conclusions and some directions for future research are put forward in terms of the bibliometric analysis findings, which may make some references for researchers in the energy field. [ABSTRACT FROM AUTHOR]

Energy poverty is a serious social issue people worldwide are facing, having a negative impact on economic development, environmental governance, social stability, and people's lives. This paper aims to make a survey of energy poverty literature through bibliometric analysis. Searched by the subject as "energy poverty", "fuel poverty", "energy poor", "fuel poor", "energy shortage", "fuel shortage", 3,419 related documents are collected from the years 1942 to 2020 in journals indexed by Web of Science Core Collection. Firstly, fundamental characteristics of the published documents and journals display the annual trend and highly concerns based on recognised bibliometric indicators. With the support of a bibliometric review approach such as VOS viewer and CiteSpace software, the most productive countries/regions, the most influential institutions, and the most influential authors are identified. The cooperation profile of energy poverty researchers shows a predominance of international cooperation. Then, the theme is particularly analysed based on keywords from four aspects: keyword-burst detection, landscape view, timeline visualisation and major specialities. At last, we conclude the bibliometric overview with significant findings and future research in the field of energy poverty. [ABSTRACT FROM AUTHOR]