Companhia Energetica de Minas Gerais CEMIG : Material Fact – Cemig completes partial redemption of external debt securities (bonds)

COMPANHIA ENERGÉTICA DE MINAS GERAIS - CEMIG

PUBLICLY HELD COMPANY

Corporate Taxpayer's ID (CNPJ): 17.155.730/0001-64

Company Registry (NIRE): 31.300.040.127

CEMIG GERAÇÃO E TRANSMISSÃO S.A. - CEMIG GT

PUBLICLY HELD COMPANY

Corporate Taxpayer's ID (CNPJ): 06.981.176/0001-58

Company Registry (NIRE): 31.300.020.550

MATERIAL FACT

Cemig concludes partial redemption of foreign debt bonds

COMPANHIA ENERGÉTICA DE MINAS GERAIS - CEMIG ("Cemig"), a category "A" publicly held company with shares traded in the stock exchanges of São Paulo, New York, and Madrid, and CEMIG GERAÇÃO E TRANSMISSÃO S.A. - CEMIG-GT("Cemig GT"), a category "B" publicly held company, a wholly-owned subsidiary of Cemig, pursuant to the provisions of Resolution 44, of August 23, 2021, as amended, issued by the Brazilian Securities and Exchange Commission ("CVM"), hereby informs its shareholders and the market in general that it has concluded the anticipated partial redemption, without premium payment and through the exercise of a purchase option ("call"), of debt bonds issued in the foreign market, maturing in December 2024, remunerated at 9.25% p.a., in the principal amount of US$375,000,000.00 (three hundred and seventy-five million U.S. dollars) (9.25% Senior Notes due 2024, "Notes"). The redemption represented a reduction of R$1,823,400,000.00 (one billion, eight hundred and twenty-three million and four hundred thousand reais) in the Company's gross debt, substantially reducing its exposure in U.S. dollars.

Thus, the outstanding balance of the Notes, maturing in December 2024, is now US$381,000,000.00 (three hundred and eighty-one million U.S. dollars).

This Material Fact is merely informative and shall not, under any circumstance, be construed as an offer to purchase or solicitation of an offer for the sale of the Notes in any jurisdiction in which an offer to purchase or solicitation of an offer for a sale is prohibited, under the securities laws of any such state or jurisdiction, including Brazil. The redemption was exclusively carried out to investors in the foreign market and shall not be registered with the CVM or offered in Brazil.

Cemig and Cemig GT reaffirm their commitment to keeping the market timely informed of the matter contained in this Material Fact, according to applicable law and regulation. Any communication to shareholders and the market in general relating to the Notes will be made on the websites of CVM (www.cvm.gov.br), B3 - Brasil, Bolsa, Balcão S.A. (http://www.b3.com.br/pt_br/), and Cemig (https://ri.cemig.com.br/).

Belo Horizonte/MG - December 21, 2023.

Leonardo George de Magalhães

Vice President of Finance and Investor Relations