Initially, Prussian blue based materials were known as a non-stoichiometric, cubic (Fm 3m) double-perovskite compound with a lattice constant of 10.16 Å and a high content of coordinated and interstitial water within its crystal defects. The significant amount of 25 % Fe 3+ vacancies was later found to be the very reason for the poor performance as a battery material measured in these early studies. Recently though, compounds with a high sodium content (low vacancy content) have emerged which could live up to the expectations that were initially placed upon Prussian blue as a battery material. These materials are often called Prussian white (PW) after the white color they exhibit when freshly synthesized in the fully sodiated state. They have been revealed to be a distorted, rhombohedral (R 3) phase with lattice constants of a=b=6.5 Å, c=18.9 Å. While being an object of intense research focus for some time, these compounds are still not fully studied theoretically. Therefore, to better understand the performance of Prussian white during a charge-discharge cycle, we shall explore its basic electronic configuration.