A report assessing the energy efficiency of the Gabriel de Castilla Base on Deception Island (Antarctica), one of the sites where the prototype of the project will be tested and where it is expected to be permanently installed, has been delivered to the Army Infrastructures Directorate. This report provides an energy characterisation of the current state of the project as a result of the work carried out during a research visit by the Defence University Centre. At the end of the report, proposals for improvement are made and an evaluation is made of the energy that would be saved with respect to its current state, by building the Base with the new modules that are being designed. This Base is going to renovate several of its buildings from the next campaign onwards, in accordance with its Master Plan.