  The field of Energy System Analysis (ESA) has experienced exponential growth
in the number of publications since at least the year 2000. This paper presents
a comprehensive bibliometric analysis on ESA by employing different algorithms
in Matlab and R. The focus of results is on quantitative indicators relating to
number and type of publication outputs, collaboration links between
institutions, authors and countries, and dynamic trends within the field. The
five and twelve most productive countries have 50% and 80% of ESA publications
respectively. The dominant institutions are even more concentrated within a
small number of countries. A significant concentration of published papers
within countries and institutions was also confirmed by analysing collaboration
networks. These show dominant collaboration within the same university or at
least the same country. There is also is a strong link among the most
successful journals, authors and institutions. The Energy journal has had the
most publications in the field, and its editor-in-chief Lund H is the author
with most of the publications in the field, as well as the author with most of
the highly cited publications in the field. In terms of the dynamics within the
field in the past decade, recent years have seen a higher impact of topics
related to flexibility and hybrid/integrated energy systems alongside a decline
in individual technologies. This paper provides a holistic overview of two
decades' research output and enables interested readers to obtain a
comprehensive overview of the key trends in this active field.
