ENERGY CO OF MINAS GERAIS

Overview

Energy Company of Minas Gerais (Cemig) is a Brazilian electric utility operating across electricity generation, transmission, distribution and trading, as well as natural-gas distribution. Its operations span 26 Brazilian states and the Federal District, giving it a broad domestic footprint.[1]

Cemig’s stated mission is to provide integrated clean and affordable energy solutions in an innovative, sustainable and competitive manner.[1] It was constituted in 1952. The latest full-year results identified in this research are for 2025, when reported segment net revenue was R$42.751 billion.[2] An official report listed 4,117 active workers at Cemig Distribuição as of June 30, 2025; this is a subsidiary figure, not a group-wide employee count.[3] [4]+4

Products & services

CEMIG’s electricity-generation portfolio includes hydroelectric, wind and solar plants. Its 2025 filing lists 68 plants—60 hydro, seven wind and one solar—with 5,517 MW of installed capacity.[6][5] Named wind assets include Praias de Parajuru, with 19 turbines on 85-metre towers, and Volta do Rio, with 28 turbines on 65-metre towers; both sell power through Proinfa.[7] The company also provides regulated electricity-transmission services, including construction, operation and maintenance of transmission facilities, and distributes electricity through networks across Minas Gerais.[8][9] Its official figures page reports distribution service in 774 municipalities and 9.5 million consumers.[10]

CEMIG’s energy-commercialization offerings include support for migration to the free energy market, technical advice, the Cemig Volt and Cemig PowerCell battery-storage products, and I-REC/Cemig REC renewable-energy certificates.[5][11] Through distributed generation and energy solutions, it invests in photovoltaic plants and offers energy-efficiency and optimization work, project studies and execution, and operation and maintenance of energy-supply facilities.[9][12] Its distributed-generation service enables customers, including solar generators, to receive bill credits for surplus electricity.[12]

CEMIG also supplies natural gas through Gasmig, serving industrial, institutional and residential customers, as well as vehicle-fueling stations and cogeneration projects. In 2025, Gasmig reported 109,931 customers in 50 cities, including 108,186 homes.[9]+2 For 2025, reported segment net revenue was R$3,074 million in generation, R$1,447 million in transmission, R$8,421 million in trading, R$29,043 million in distribution and R$2,789 million in gas; these are segment figures, not revenue attributed to individual named products.[4] [6]+17

Geographic presence

ENERGY CO OF MINAS GERAIS (Cemig) is headquartered in Belo Horizonte, Minas Gerais, Brazil. Its electricity distribution operations cover practically the entire state of Minas Gerais, and its gas-distribution concession is also located there.[15][7]

The group’s generation and transmission assets are principally part of Brazil’s National Interconnected System. Its reported portfolio includes wind farms in Beberibe and Acaraú, Ceará, and a hydroelectric plant on the border of Rio de Janeiro and Espírito Santo.[7][5]

The 2025 reporting disclosures present revenue by business segment rather than by country or region, and do not provide a geographic revenue split or workforce distribution by location.[4] [15]+3

Business segments

Cemig’s 2025 segment reporting identifies five operating segments: energy generation, energy transmission, energy trading, energy distribution, and gas. It separately reports investees and eliminations as reconciliation items, rather than as additional operating segments. The latest available annual filing is the 2025 Form 20-F, filed in 2026.[4][16]

By 2025 net revenue, energy distribution was the largest segment, with R$29,043 million, or approximately 67.9% of the R$42,751 million consolidated total. Energy trading contributed R$8,421 million (19.7%); generation, R$3,074 million (7.2%); gas, R$2,789 million (6.5%); and transmission, R$1,447 million (3.4%). Investees contributed R$120 million (0.3%), while eliminations were negative R$2,143 million (−5.0%). Percentages are approximate and calculated against consolidated net revenue, including the effect of eliminations.[4]

The segments focus respectively on producing and selling electricity; providing electricity transmission services; marketing and intermediating energy-related business; distributing electricity; and supplying and distributing natural gas.[5]+2 The same segment labels appear in the 2024 and 2023 comparative segment tables.[18][19] [4]+7

Company history

Cemig was incorporated in 1952 under Minas Gerais State Law 828. Its first hydroelectric plants—Tronqueiras and Itutinga in 1955, followed by Salto Grande in 1956—marked the start of its generation history.[20]+3

The company began transmission and distribution operations in 1960. During the 1970s it expanded service in Minas Gerais, built about 6,000 kilometres of transmission lines, and commissioned the São Simão hydroelectric plant in 1978. In 1984, state law changed its name to Companhia Energética de Minas Gerais.[20]+2

In the 1990s, Cemig developed hydroelectric projects with private partners; Igarapava entered service in 1998. In 2004, Cemig established separate generation-and-transmission and distribution subsidiaries, with the distribution subsidiary beginning operations in January 2005. In 2006, the company reported acquiring a stake in Light and interests in five transmission companies.[26]+3 [20]+18

Sources

• www.cemig.com.br[1]
• ri.cemig.com.br[2]
• www.cemig.com.br[3]
• ENERGY CO OF MINAS GERAIS — Full financial report (2025 Y)
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• www.cemig.com.br[12]
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• www.cemig.com.br[23]
• www.cemig.com.br[24]
• www.almg.gov.br[25]
• ri.cemig.com.br[26]
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