"Companias de luz" is a Spanish phrase that means "light companies" in English. Literally, the phrase translates as "companies of light" and is usually used to reference electric companies that provide power and utility services to residential and commercial properties.
"Companias de luz" is often used interchangeably with the phrases "compania de electricidad" and "companias electricas" by energy providers in the United States that serve a large Hispanic population. Both phrases mean "electric company" in English. "Proveedor de electricidad" and "servicio de energia" are similar phrases individuals may see with "companias de luz". These phrases mean "electricity provider" and "energy service" respectively.