An arrangement for optimal energy storage and recapturing of thermal wells, such an arrangement comprising a heat storage having: a heat transfer fluid, an underground centre storage , bore wells surrounding the centre storage in a substantially concentric manner, there being two or more circles , whereby the centre storage and the bore wells are arranged to communicate with each other and with one or more heat sources leading thermal energy to the system by means of a pipe-line , the heat storage being provided with valves , controlled by a control unit , as to control the circulation of the heat transfer fluid, characterised in that the control unit is arranged to continuously compare the temperature of the heat transfer fluid arriving from the heat source with the target temperature of a bore well encountered, the bore wells are connected in parallel with respect to each other, whereby it is possible to lead warm carrier fluid to each bore well separately along the pipelines, and the bore wells in each circle are connected by pipelines into separate groups the flow of which are separately controlled by the valves , whereby these groups are arranged to form sectors (S) circularly surrounding the centre storage , which each sector is arranged to separately receive thermal energy such, that the storage field is configured to be heated radially outwards from the centre of the storage, starting with the first part of the circle of the heat storage whose temperature is below the temperature of the arriving heat transfer fluid, and to continue in the sector radially outward a circle or part of a circle at a time, and, when the outermost circle sector has reached its target temperature, to begin the heating of the next adjacent sector. a heat transfer fluid, an underground centre storage , bore wells surrounding the centre storage in a substantially concentric manner, there being two or more circles , whereby the centre storage and the bore wells are arranged to communicate with each other and with one or more heat sources leading thermal energy to the system by means of a pipe-line , the heat storage being provided with valves , controlled by a control unit , as to control the circulation of the heat transfer fluid, characterised in that the control unit is arranged to continuously compare the temperature of the heat transfer fluid arriving from the heat source with the target temperature of a bore well encountered, the bore wells are connected in parallel with respect to each other, whereby it is possible to lead warm carrier fluid to each bore well separately along the pipelines, and the bore wells in each circle are connected by pipelines into separate groups the flow of which are separately controlled by the valves , whereby these groups are arranged to form sectors (S) circularly surrounding the centre storage , which each sector is arranged to separately receive thermal energy such, that the storage field is configured to be heated radially outwards from the centre of the storage, starting with the first part of the circle of the heat storage whose temperature is below the temperature of the arriving heat transfer fluid, and to continue in the sector radially outward a circle or part of a circle at a time, and, when the outermost circle sector has reached its target temperature, to begin the heating of the next adjacent sector. <EOS>