Method for controlling an electrical energy supply network, from which electrical end consumers (13a-d) are supplied with electrical energy and into which such decentralized energy producers (12a-c) feed electrical energy, the amount of energy produced by said producers depending on a current weather situation in the local area of the respective decentralized energy producer (12a-c), the following steps being carried out in the method: - a mathematical network model is provided in a control device of an automation installation of the electrical energy supply network, the network model indicating a relationship between a current weather situation in the local area of the respective decentralized energy producer (12a-c) and the electrical energy fed into individual sections (17a, 17b) of the electrical energy supply network by the respective decentralized energy producer (12a-c); - weather data indicating a current weather situation in the local area of the respective decentralized energy producers (12a-c) are transmitted to the control device; - weather forecast data indicating an expected future weather situation in the area of the respective decentralized energy producers (12a-c) are determined from the weather data by means of the control device; and - an expected future supply of electrical energy into the electrical energy supply network by the respective decentralized energy producers (12a-c) is determined from the weather forecast data by means of the control device using the network model; characterized by the following step - control signals are produced by means of the control device and are used to stabilize a voltage level in those sections (17a, 17b) of the energy supply network in which an expected future supply of electrical energy has been determined using the results of the network model, which expected future supply results in a deviation of the voltage level in the respective section (17a, 17b) from a predefined desired voltage level, which deviation exceeds a deviation threshold value. - a mathematical network model is provided in a control device of an automation installation of the electrical energy supply network, the network model indicating a relationship between a current weather situation in the local area of the respective decentralized energy producer (12a-c) and the electrical energy fed into individual sections (17a, 17b) of the electrical energy supply network by the respective decentralized energy producer (12a-c); - weather data indicating a current weather situation in the local area of the respective decentralized energy producers (12a-c) are transmitted to the control device; - weather forecast data indicating an expected future weather situation in the area of the respective decentralized energy producers (12a-c) are determined from the weather data by means of the control device; and - an expected future supply of electrical energy into the electrical energy supply network by the respective decentralized energy producers (12a-c) is determined from the weather forecast data by means of the control device using the network model; - control signals are produced by means of the control device and are used to stabilize a voltage level in those sections (17a, 17b) of the energy supply network in which an expected future supply of electrical energy has been determined using the results of the network model, which expected future supply results in a deviation of the voltage level in the respective section (17a, 17b) from a predefined desired voltage level, which deviation exceeds a deviation threshold value.