Method for estimating electricity consumption during one or more transmission intervals of a transmission site or part of a transmission site having an associated scheduler for scheduling assignments, and at least one radio transmitter having a radio efficiency ( η r), said method comprising a step of: - Estimating scheduled transmission electricity consumption ( E TOT) based on a quotient of a sum ( P sch,sum) of scheduled radio transmission powers ( P sch) and the radio efficiency ( η r), the method further comprising a method for controlling a set of energy sources supplying the transmission site or part of the transmission site with electric power, wherein the method is characterized in that it further comprises: - Estimating of available power capacity (P av,cap) of one or more available energy sources; - Comparing available power capacity (P av,cap) of power feeding energy source or sources to the electricity consumption comprising scheduled transmission electricity consumption ( E tr,TOT)during a coming scheduled transmission interval; - Selecting based on the comparison and one or more pre-defined conditions of the one or more available energy sources at least one available energy source, as power feeding energy source for accomplishing the total needed power of the transmission site or part of the transmission site for the coming time period; and - Controlling the one or more available energy sources according to the selection and the one or more pre-defined conditions of the one or more available energy sources. - Estimating scheduled transmission electricity consumption ( E TOT) based on a quotient of a sum ( P sch,sum) of scheduled radio transmission powers ( P sch) and the radio efficiency ( η r), the method further comprising a method for controlling a set of energy sources supplying the transmission site or part of the transmission site with electric power, wherein the method is characterized in that it further comprises: - Estimating of available power capacity (P av,cap) of one or more available energy sources; - Comparing available power capacity (P av,cap) of power feeding energy source or sources to the electricity consumption comprising scheduled transmission electricity consumption ( E tr,TOT)during a coming scheduled transmission interval; - Selecting based on the comparison and one or more pre-defined conditions of the one or more available energy sources at least one available energy source, as power feeding energy source for accomplishing the total needed power of the transmission site or part of the transmission site for the coming time period; and - Controlling the one or more available energy sources according to the selection and the one or more pre-defined conditions of the one or more available energy sources. - Estimating of available power capacity (P av,cap) of one or more available energy sources; - Comparing available power capacity (P av,cap) of power feeding energy source or sources to the electricity consumption comprising scheduled transmission electricity consumption ( E tr,TOT)during a coming scheduled transmission interval; - Selecting based on the comparison and one or more pre-defined conditions of the one or more available energy sources at least one available energy source, as power feeding energy source for accomplishing the total needed power of the transmission site or part of the transmission site for the coming time period; and - Controlling the one or more available energy sources according to the selection and the one or more pre-defined conditions of the one or more available energy sources.