Abstract: A modular power grid illumination system is provided. The illumination system generally includes a luminary including a light emitting module, a longitudinal housing assembly to receive the light emitting module, first and second end caps at opposite ends of the housing assembly, and first and second twist-in connectors coupled to respective first and second end caps. The twist-in connectors couple the luminary to a power grid at opposing ends of the luminary while also providing a source of low voltage electrical power to the luminary.