An electrical power-supplying device for supplying electrical power to a group of electrical appliances located in an environment. The electrical power supplying device includes a power supply cord for plugging into a standard power receptacle by way of a power supply plug, and supplying AC electrical power to the device. The device includes a housing base portion having a central aperture providing access to a 3D interior volume bounded by a side wall extending circumferentially about the 3D interior volume and having a capacity for holding a plurality of power adapter modules and/or power adapter blocks associated with said group of electrical appliances located in the environment. The device further includes a central power-receptacle assembly having a peninsula-like housing structure supported generally within the central portion of the housing base portion and extending above the bottom support surface within the 3D interior volume, and towards a portion of the wall of the housing base portion, and supporting a plurality of internally disposed alternating current (AC) electrical receptacles and one or more electronic circuits, including an AC-to-DC power conversion circuit, which are operably connected to the power supply cord.