Melting method comprising: - a step of loading solid metal material into an electric furnace; - a step of powering the electric furnace and of generating an electric arc between at least one electrode (13a, 13b, 13c) and the metal material; - a step of melting the solid metal material to obtain molten material, wherein the step of powering comprises: - the supply, by means of an electric power grid, of a mains voltage (Ur), and a mains current (Ir); - the transformation, with at least one transformer of said mains voltage (Ur) and mains current (Ir) into a base voltage (Ub) and a base current (Ib) which are selectively settable; - the rectifying of said base voltage (Ub) and base current (Ib) with a plurality of rectifiers to obtain a direct voltage and electric current; - the conversion, with a plurality of converters, of said direct voltage and electric current into an alternating supply voltage (Ua) and alternating supply current (Ia) which are selectively settable by means of a control and command unit connected to said converters; - supplying said supply voltage (Ua) and supply current (Ia) to a plurality of electrodes (13a, 13b, 13c) of the electric furnace, wherein the method provides to regulate the power supply of the electrodes (13a, 13b, 13c) in an independent manner one with respect to the other, so as to vary the respective lengths of the electric arcs and automatically regulate the distribution of the thermal power inside the electric furnace so as to maximize the thermal power in different zones of the electric furnace, that is to maximize the thermal power where it is most needed and to reduce it in the zones where it is sufficient to keep the metal, already in a liquid state, at temperature, as a function of one or several parameters considered, chosen from the phase of the melting cycle, the position or quantity of the solid metal material in the electric furnace, and the type of metal material to be melted, and wherein the method provides to regulate the thermal power delivered by the electrodes (13a, 13b, 13c) by translating the electrodes (13a, 13b, 13c) in a defined transverse direction with respect to their longitudinal axis as a function of the demand for power in a determinate zone of the electric furnace and/or in a determinate phase of the melting cycle. - a step of loading solid metal material into an electric furnace; - a step of powering the electric furnace and of generating an electric arc between at least one electrode (13a, 13b, 13c) and the metal material; - a step of melting the solid metal material to obtain molten material, wherein the step of powering comprises: - the supply, by means of an electric power grid, of a mains voltage (Ur), and a mains current (Ir); - the transformation, with at least one transformer of said mains voltage (Ur) and mains current (Ir) into a base voltage (Ub) and a base current (Ib) which are selectively settable; - the rectifying of said base voltage (Ub) and base current (Ib) with a plurality of rectifiers to obtain a direct voltage and electric current; - the conversion, with a plurality of converters, of said direct voltage and electric current into an alternating supply voltage (Ua) and alternating supply current (Ia) which are selectively settable by means of a control and command unit connected to said converters; - supplying said supply voltage (Ua) and supply current (Ia) to a plurality of electrodes (13a, 13b, 13c) of the electric furnace, wherein the method provides to regulate the power supply of the electrodes (13a, 13b, 13c) in an independent manner one with respect to the other, so as to vary the respective lengths of the electric arcs and automatically regulate the distribution of the thermal power inside the electric furnace so as to maximize the thermal power in different zones of the electric furnace, that is to maximize the thermal power where it is most needed and to reduce it in the zones where it is sufficient to keep the metal, already in a liquid state, at temperature, as a function of one or several parameters considered, chosen from the phase of the melting cycle, the position or quantity of the solid metal material in the electric furnace, and the type of metal material to be melted, and wherein the method provides to regulate the thermal power delivered by the electrodes (13a, 13b, 13c) by translating the electrodes (13a, 13b, 13c) in a defined transverse direction with respect to their longitudinal axis as a function of the demand for power in a determinate zone of the electric furnace and/or in a determinate phase of the melting cycle.