A system for providing AC or DC power, for charging or powering electrical/electronic devices that are being used whilst the device is located at, around or within, an item of furniture which is defined as an item that has no local connection point to a mains AC wired power supply of an environment. The system is provided by a series of modules, at least some of which are based around a single mechanical fixation system, thereby allowing the furniture designer or manufacturer to implement a common mechanical fixing system and choose from a variety of modules to create the electrical system so desired. Modules within the system include a at least one battery module plus modules such as a Power Supply Unit (PSU), an AC or DC power in-feed connection point, DC power provision points, inverter, AC power provision points, switches, electrical protection devices and/or power control devices.