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The risks of technological accidents in the energy sector and their potentially disastrous effects have been analyzed over the past decades, and are nowadays generally recognized to constitute a key factor in an encompassing assessment of energy security. In contrast, the issue of intentional attacks on energy infrastructures has received increased attentionmore recently, particularly due to growing dependence of energy imports fromand transit routes through regions considered less reliable and politically stable. Both types of risks, however, illuminate different vulnerabilities. Therefore, the focus of the present analysis was on these two risk categories: accidents and intentional attacks in the energy sector. Risk assessment resultswere based on quantitative data from the databases ENSAD (Energy-related Severe Accident Database) and EIAD (Energy Infrastructure Attack Database). Evaluations examined …