Abstract: An electrosurgical system and a method for the operation thereof are disclosed. The electrosurgical system includes a supply apparatus and an electrosurgical instrument connected thereto having at least one instrument electrode. By means of the instrument electrode, biological tissue of a patient can be treated, for example by creation of a spark between the instrument electrode and tissue. The supply apparatus evaluates at least one operating parameter of the operating circuit, which includes the electrosurgical instrument and the treated tissue, and which is supplied with electrical power by the supply apparatus. A tissue type of the treated tissue is recognized by evaluation of at least one operating parameter. Thereupon at least one electrical parameter of the provided electrical power can be adapted or modified so that the electrical power provided to the electrosurgical instrument is optimized for the tissue type of the currently treated tissue.