Standard Energy Units (SEUs) are a standardized unit of measurement in the Frontier commonly used for power supplies. They measure the output of a Power Generator, and the capacity of power packs and batteries.
Prior to the introduction of the Credit, SEUs were used in many places as a form of universal currency. They still are used as a trade commodity in remote places where other forms of banking are not available. They are pegged at 5 credits each.
SEUs are generally stored in multi-capacitor, single-use (i.e. non-rechargeable) devices such as Powerclips, mini-powerclips and power discs, or in rechargeable active-matrix devices such as Power Beltpacks, Power Backpacks and Parabatteries.