Equatorial Energia : Notice to the Market - CEMAR´s 2017 Periodic Tariff Review

Equatorial Energia S.A. Publicly-held Company CNPJ/MF nº 03.220.438/0001-73

Cia. Energética do Maranhão - CEMAR

Publicly-held Company CNPJ/MF nº 06.272.793/0001-84

NOTICE TO THE MARKET

ANEEL Approves the Final Results for CEMAR's 4th Periodic Tariff Review

Equatorial Energia S.A. and Cia. Energética do Maranhão -CEMAR inform the market that Agência Nacional de Energia Elétrica ("ANEEL"), at a public Board Meeting held today, approved the final results for CEMAR's 4th Periodic Tariff Review valid as from August 28, 2017. These results will be the economic basis for the annual adjustments for the period between 2018 and 2020.

Already considering the financial components in the Company's tariff, the average effect to be perceived by the consumers was calculated at 12.88%.

Regarding the regulatory losses considered in the Company's tariff, ANEEL approved the 12.06% for technical losses over injected energy, and determined the non-technical losses over low voltage market trajectory from 10.31% for the first year of the cycle and 8.86% for the last year of the cycle.

Additionally, ANEEL established the ex-ante components of CEMAR's X Factor. For the Pd component (related to productivity), the percentage was determined at 1.53%. For the T component (related to the operating costs trajectory), the percentage was determined at 0.34%. To these figures, the Q component (related to quality indicators) should be added or subtracted, and it should be established every year on the tariff adjustments.

Brasília, August 22, 2017

Eduardo Haiama

Chief Investor Relations Officer Cia. Energética do Maranhão - CEMAR

Chief Financial and Investor Relations Officer Equatorial Energia S.A.