Light S.A. (Portuguese pronunciation: [ˈlajtʃ]) is a private sector public utility company of Rio de Janeiro, Brazil. Founded in 1904 in Toronto, Ontario, Canada by The Rio de Janeiro Tramway, Light and Power Co. Ltd., it was authorized to operate in Brazil in 1905.

This article relies largely or entirely on a single source. (July 2018)

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Light S.A.

Company type	Sociedade Anônima
Traded as	B3: LIGT3
Industry	Electricity
Founded	1904
Headquarters	Rio de Janeiro , Brazil
Key people	Octavio Lopes Pereira, (CEO)
Products	Electrical power
Services	Electricity distribution Electricity transmission
Revenue	US$ 4.3 billion (2021)[1]
Net income	US$ 13.931  million (2021)[1]
Number of employees	3,735
Website	www.light.com.br

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Research activities of generation, distribution and sale of electricity and each of these areas is represented by a different company. Currently the controlling stake in Light is owned by CEMIG, an electric company based in Belo Horizonte.

Electrical power infrastructure in Rio de Janeiro was originally developed in 1904 by the Rio de Janeiro Tramway, Light and Power Company, a company financed with foreign capital and legally domiciled in Toronto, Ontario, Canada. After 1912, this company was part of the holding company Brazilian Traction, Light and Power Company (usually known in Brazil simply as "Light"), which eventually changed its name to Brascan (for "Brasil" + "Canada"). In 1979, the company's Brazilian assets transferred to Brazilian ownership. The Canadian company, which had in the meantime diversified to other areas, still exists under the name Brookfield Asset Management.

On May 12, 2023, Light filed for bankruptcy.^[2]