A method performed by one or more apparatuses (110, 141-145, 300) comprising: - obtaining generation information indicative of an amount of generated electricity, wherein the generated electricity is generated by an electricity generating facility; - obtaining consumption information indicative of a quantity of consumed electricity, the electricity being consumed by a household; - determining capacity information indicative of dimensioning of an energy storage device, wherein the capacity information is determined based at least in part on the obtained generation information and on the obtained consumption information; - outputting or causing to be output the determined capacity information; and - obtaining feed-in information indicative of an amount of electricity that is feedable into a power grid, wherein the amount of electricity that is feedable into the power grid was generated by the electricity generating facility; wherein the determining of the capacity information is based at least in part on the obtained feed-in information; characterised in that the method further comprises: - determining release information indicative of a portion of the capacity of the energy storage device that is usable for temporarily storing electrical energy from the power grid, wherein the release information is determined based at least in part on the determined capacity information; - outputting or causing to be output the specific release information; - releasing of the portion of the capacity of the energy storage device for intermediate storage of electricity from the power grid; and - obtaining inverter information indicative of power losses that occur when converting electricity generated by the electricity generating facility into electricity usable by the household; wherein the determining of the capacity information is based at least in part on the obtained inverter information, and wherein an additional dimensioning of the inverter takes place. - obtaining generation information indicative of an amount of generated electricity, wherein the generated electricity is generated by an electricity generating facility; - obtaining consumption information indicative of a quantity of consumed electricity, the electricity being consumed by a household; - determining capacity information indicative of dimensioning of an energy storage device, wherein the capacity information is determined based at least in part on the obtained generation information and on the obtained consumption information; - outputting or causing to be output the determined capacity information; and - obtaining feed-in information indicative of an amount of electricity that is feedable into a power grid, wherein the amount of electricity that is feedable into the power grid was generated by the electricity generating facility; wherein the determining of the capacity information is based at least in part on the obtained feed-in information; characterised in that the method further comprises: - determining release information indicative of a portion of the capacity of the energy storage device that is usable for temporarily storing electrical energy from the power grid, wherein the release information is determined based at least in part on the determined capacity information; - outputting or causing to be output the specific release information; - releasing of the portion of the capacity of the energy storage device for intermediate storage of electricity from the power grid; and - obtaining inverter information indicative of power losses that occur when converting electricity generated by the electricity generating facility into electricity usable by the household; wherein the determining of the capacity information is based at least in part on the obtained inverter information, and wherein an additional dimensioning of the inverter takes place. wherein the determining of the capacity information is based at least in part on the obtained feed-in information; characterised in that the method further comprises: - determining release information indicative of a portion of the capacity of the energy storage device that is usable for temporarily storing electrical energy from the power grid, wherein the release information is determined based at least in part on the determined capacity information; - outputting or causing to be output the specific release information; - releasing of the portion of the capacity of the energy storage device for intermediate storage of electricity from the power grid; and - obtaining inverter information indicative of power losses that occur when converting electricity generated by the electricity generating facility into electricity usable by the household; - determining release information indicative of a portion of the capacity of the energy storage device that is usable for temporarily storing electrical energy from the power grid, wherein the release information is determined based at least in part on the determined capacity information; - outputting or causing to be output the specific release information; - releasing of the portion of the capacity of the energy storage device for intermediate storage of electricity from the power grid; and - obtaining inverter information indicative of power losses that occur when converting electricity generated by the electricity generating facility into electricity usable by the household; wherein the determining of the capacity information is based at least in part on the obtained inverter information, and wherein an additional dimensioning of the inverter takes place.