Еnergy and its infrastructure facilities are important for the normal life of modern society. The theft of energy resources can lead to disruption of the operation of energy facilities, which in turn will affect the development of production, the daily life of a large number of people, will entail dangerous economic and social consequences. It should be noted that thefts in the field of energy resources are not as rare as it seems at first glance, and the investigation of criminal cases related to the theft of energy resources can be difficult due to the complexity of understanding the object of theft, the large volume of investigative actions that need to be carried out. First of all, the investigation of such criminal cases can be difficult for young professionals just starting their career. The list of necessary investigative actions, the procedure for their conduct may depend on the information that will be reported by witnesses questioned in criminal cases about theft in the field of energy resources - eyewitnesses of the acts, employees of the organization that was harmed as a result of theft, employees of operational units that revealed the fact of theft, relatives of the suspect (accused). However, the interrogation of these persons has its own peculiarities, which (together with practical recommendations for conducting this investigative action) are covered in this article.