The results are reported of an energy-economic analysis of the use of berms in thermal energy storage (TES) systems. The analysis compares the initial cost savings derived from using a bermed tank instead of an in-ground tank, with the additional costs associated with the greater heat losses for the bermed tank over the life of the installation. The main factors considered include: (1) the increased excavation associated with an in-ground tank, (2) the increased wall structural support required for an in-ground tank, (3) the haulage and disposal of excavated soil for an in-ground tank, compared with the haulage and disposal or acquisition of soil for a bermed tank, (4) the forming of soil into a berm, and (5) the increased heat loss associated with a bermed tank. In evaluating the last factor, the findings of previous studies are used by the author into the effects of berms on TES heat losses. As space for the berm is assumed available, the cost associated with any land additionally required: for the berm is neglected. The results indicate that tanks having berms are, in most practical instances, economically superior to other tank configurations.