A method for operating a steam power plant (10a, 10b), said steam power plant comprising: a main water steam cycle with a high pressure steam turbine, an intermediate pressure steam turbine and a low pressure steam turbine; a condenser; and a feed water tank, wherein a plurality of low pressure heaters are arranged between said condenser and said feed water tank and wherein a plurality of high pressure heaters (21a, 21b) are arranged downstream of said feed water tank, whereby said low pressure heaters, said feed water tank and said plurality of high pressure heaters (21a, 21b) are supplied with steam from a plurality of extractions (E1-E7) of said steam turbines (11, 12, 13), said method comprising the steps of: a. providing a steam storage means within said steam power plant (10a, 10b); b. storing, during a first operation period of said steam power plant (10a, 10b), steam in said steam storage means; and c. discharging, during a second operation period of said steam power plant (10a, 10b), steam stored in said steam storage means, during said first operation period, into the main water steam cycle to save steam extracted from said plurality of extractions (E1-E7) at said steam turbines (11, 12, 13), wherein during said first operation period: steam extracted from said high pressure steam turbine is stored in said steam storage means; a first of said plurality of high pressure heaters (21a, 21b) is supplied with steam extracted from said intermediate pressure steam turbine; and steam is discharged into said first of said plurality of high pressure heaters (21a, 21b) from said steam storage means during said second operation period of said steam power plant (10a, 10b), and wherein said steam discharged from said steam storage means into said first of said plurality of high pressure heaters (21a, 21b) during said second operation period is superheated with a steam extracted from said high pressure steam turbine or with a hot reheat steam, which is available at an inlet of said intermediate pressure steam turbine or with steam, which is extracted from said intermediate pressure steam turbine for supplying said first of said plurality of high pressure heaters (21a, 21b). a main water steam cycle with a high pressure steam turbine, an intermediate pressure steam turbine and a low pressure steam turbine; a high pressure steam turbine, an intermediate pressure steam turbine and a low pressure steam turbine; a condenser; and a feed water tank, wherein a plurality of low pressure heaters are arranged between said condenser and said feed water tank and wherein a plurality of high pressure heaters (21a, 21b) are arranged downstream of said feed water tank, whereby said low pressure heaters, said feed water tank and said plurality of high pressure heaters (21a, 21b) are supplied with steam from a plurality of extractions (E1-E7) of said steam turbines (11, 12, 13), said method comprising the steps of: a. providing a steam storage means within said steam power plant (10a, 10b); b. storing, during a first operation period of said steam power plant (10a, 10b), steam in said steam storage means; and c. discharging, during a second operation period of said steam power plant (10a, 10b), steam stored in said steam storage means, during said first operation period, into the main water steam cycle to save steam extracted from said plurality of extractions (E1-E7) at said steam turbines (11, 12, 13), a. providing a steam storage means within said steam power plant (10a, 10b); b. storing, during a first operation period of said steam power plant (10a, 10b), steam in said steam storage means; and c. discharging, during a second operation period of said steam power plant (10a, 10b), steam stored in said steam storage means, during said first operation period, into the main water steam cycle to save steam extracted from said plurality of extractions (E1-E7) at said steam turbines (11, 12, 13), steam extracted from said high pressure steam turbine is stored in said steam storage means; a first of said plurality of high pressure heaters (21a, 21b) is supplied with steam extracted from said intermediate pressure steam turbine; and steam is discharged into said first of said plurality of high pressure heaters (21a, 21b) from said steam storage means during said second operation period of said steam power plant (10a, 10b), and wherein said steam discharged from said steam storage means into said first of said plurality of high pressure heaters (21a, 21b) during said second operation period is superheated with a steam extracted from said high pressure steam turbine or with a hot reheat steam, which is available at an inlet of said intermediate pressure steam turbine or with steam, which is extracted from said intermediate pressure steam turbine for supplying said first of said plurality of high pressure heaters (21a, 21b).