The Powerhouse was the Giant most characteristic of the Eastern Seaboard Twin Cities, composed of Washington D.C and Baltimore. In spite of the engines, chosen for the sake of power and reliability, it cannot maintain itself in flight, this being a trait effectively exclusive to it and The Curse. A relatively short-legged aircraft, it's a, fast, yet heavily armed aircraft that has spread all over the region due to it's relative simplicity. It was originally made to attack the main rival of the Twin Cities: the USS colonies in the Delmarva Peninsula. The reason for this rivalry is simple: the USS is the main obstacle to the Twin Cities' long-term project of restoring the old United States through alliances and colonies.

The Twin Cities actively model themselves after Old World America: Their political system is a representative democracy modeled on the US constitution that claims legitimacy as the sucessor to the Old USA (one of the aspects of it's rivalry with the USS is due to the latter's similar claim) and one of the constituents is the old American capital. While they have a rivalry with the Megalopolis of New York, they both have formed fragile alliances against the USS.