Carbon surcharge for coal, oil, gas and limestone for different storage options as a function of the storage time. left: Storage in large-scale enclosed coal and limestone bunkers with ccoal = climestone = 200 €/t, in large steel storage tanks for oil with coil = 300 €/t and in gas tank farms with pipe containers (70 bar storage pressure) with cgas = 550 €/t. right: Storage in small-scale storages (incl. container, wagon and tracks) with ccoal = climestone = 2200 €/t, coil = 1900 €/t and cgas = 8900 €/t. Lines are for interest rates i = 0% (lower line), i = 5% (middle line) to i = 10% (upper line) and for a lifetime of the storage infrastructure of n = 10 years. The area between i = 0% and i = 10% is shaded to guide the eye.