Main Electricity Voltage By Brazilian States

Map created by X user
Karol KarpinskiThe map above shows the rather insane electricity situation that exists in Brazil. States either use 127 volts (127v) (similar to the US at 120 volts) or 220 volts (220v) (close to Europe’s 230 volts).

Of course Brazil being Brazil there are exceptions in both cases of cities within a state using different voltage than the state norm.

I was able to find the following list of exceptions:

State	Volts	Exceptions
Acre	127 V
Alagoas	220 V
Amapá	127 V
Amazonas	127 V
Bahia	220 V	Aiquara; Alagoinhas; Almadina; Antas; Antônio Cardoso; Apauarema; Aracás; Aratuipe; Aurélio Leal; Barra do Rocha; Governador Lomanto Jr.; Belmonte; Bom Jesus da Lapa; Boquira; Brej;es; Buerarema; Cabeceiras do Paraguaçú; Cacoahaeira; Camaçari; Canavieiras; Candeias; Castro Alves; Catú; Cipó; Conceição da Feira; Conceição do Almeida; Conceição do Jacuipe; Coração de Maria; Coronel João Sá; Correntina; Cravolândia; Cruz das Almas; Dário Meira; Firmino Alves; Floresta Azul; Gongogi; Governador Mangabeira; Ibicaraí; Ibicui; Ibirapitanga; Ibirataia; Iguai; Ilheus; Ipecaeta; Ipiau; Irará; Itabuna; Itacaré; Itagiba; Itaju do Colonia; Itajuipe; Itanagra; Itaparica; Itape; Itapitanga; Itaquara; Itatim; Itiruçú; Itororó; Jaborandi; Jaguaquara; Jeremoabo; Jiquirica; Jitauna; Jussari; Lagedo do Tabocal; Lauro de Freitas; Madre de Deus; Maracas; Maragogipe; Muniz Ferreira; Muritiba; Nazaré; Nova Canaã; Nova Itarana; Novo triunfo; Ouricangas; Paulo Afonso; Pedrão; Pedro Alexandre; Piraí do Norte; Pojuca; Rafael Jambeiro; Salvador; Santa Cruz da Vitória; Santa Inês; Santanópolis; Santa Terezinha; Santa Luzia; Santa Maria da Vitória; Santana; Santo Amaro; Santo Antônio de Jesus; Santo Estevão; São Desidério; São Felipe; São Felix; São Felix do Coribe; São Francisco do Conde; São José da Vitória; São Miguel das Matas; Sapeaçú; Sátiro Dias; Saubara; Serra do Ramalho; Serra Preta; Sim;es Filho; Sítio do Mato; Sítio do Quino; Teodoro Sampaio; Terranova; Ubaíra; Urucuca; Varzedo; Vera Cruz
Ceará	220 V
Distrito Federal	220 V
Espírito Santo	127 V	Alegre; Gaçuí
Goiás	220 V
Maranhão	220 V
Mato Grosso	127 V	Araguaiana; Barra das Garças; Cocalinho
Mato Grosso do Sul	127 V
Minas Gerais	127 V
Pará	127 V
Paraíba	220 V
Paraná	127 V	Rio Negro
Pernambuco	220 V
Piauí	220 V
Rio de Janeiro	127 V	Nova Friburgo
Rio Grande do Norte	220 V
Rio Grande do Sul	220 V	Arroio do Sal; Canoas; Capão da Canoa; Capela de Santana; General Câmara; Imbé; Porto Alegre; Rio Grande; São Leopoldo; Torres; Tramandaí; Três Cachoeiras; Três Palmeiras
Rondônia	127 V
Roraima	127 V
Santa Catarina	220 V
São Paulo	127 V	Assis; Bastos; Biritiba-Mirim; Boituva; Bora; Caçapava; Campo Limpo Paulista; Cândido Mota; Caraguatatuba; Cruzalia; Echapora; Florinea; Guarujá; Iacri; Ibirarema; Iepe; Indaiatuba; Iperó; Itupeva; Jambeiro; João Ramalho; Jundiaí; Loveira; Lutécia; Maracaí; Mogi das Cruzes; Oscar Bressane; Palmital; Paraguaçú; Paulista; Platina; Porto Feliz; Quatá; Rancharia; Ribeirão do Sul; Rinópolis; Salesópolis; Salto Grande; Santa Branca; São José dos Campos; São Sebastião; Tupã; Várzea Paulista; Vinhedo
Sergipe	110 V, 115 V, 117 V, 127 V
Tocantins	220 V	Dianópolis

Here’s why:

Early Fragmentation (late 19th–early 20th century)

• Electricity arrived in Brazil in isolated, privately-owned projects, mostly serving urban areas.
• Foreign companies, notably American, Canadian, British, and German utilities, installed independent systems with varying voltages and frequencies, often importing equipment that matched their home country’s standards (mostly from North America and Europe).
• In São Paulo, Rio de Janeiro, and Minas Gerais, power companies established local grids independently without coordinated standardization.

Multiple Standards (1920s–1950s)

• As local grids expanded, multiple voltage and frequency standards emerged:
  • 110V, 115V, 127V systems (mostly American-influenced).
  • 220V (European-influenced), introduced by European companies, offered lower distribution losses for longer distances, especially suited for rural areas or large industrial loads.
• Initially, cities or even neighborhoods adopted whatever standard was easiest or cheapest at the time, given available equipment.

Partial Harmonization Attempts (1950s–1980s)

• Government-sponsored initiatives sought national harmonization but encountered resistance due to high transition costs and powerful regional utilities.
• Ultimately, 127V (derived from early North American standards—nominally called “110V”) and 220V coexisted:
  • Many states standardized on 127V as their residential voltage.
  • Others favored 220V for residential or industrial use due to perceived efficiency advantages.
• Industrial and rural areas leaned toward 220V, since it reduced power losses and wiring costs over longer distances.

Regional Divergence and Exceptions (1970s–1990s)

• Powerful state-owned utilities (e.g., CEMIG in Minas Gerais, Eletropaulo in São Paulo, Light in Rio) solidified local preferences:
  • São Paulo capital region mostly adopted 127V residential and 220V for heavy loads.
  • The Northeast states predominantly chose 220V residential voltage.
  • Rio de Janeiro maintained a mixed system (127V in most residential settings, but 220V in some neighborhoods and for high-power appliances).
• Infrastructure was built around local choices. Retrofitting older systems was considered prohibitively expensive, further entrenching regional exceptions.

Institutional Consolidation and Official Standardization (2000s onwards)

• In the early 2000s, Brazil’s National Electricity Agency (ANEEL) attempted to clarify standards and voltage ranges, adopting officially 127V and 220V as standard voltages.
• 127V replaced legacy “110V/115V” references, becoming the official standardized voltage.
• Still, changing already-built infrastructure was costly, resulting in acceptance and institutionalization of a patchwork approach.
• Government regulations standardized appliance labeling, clearly indicating voltages, mitigating confusion for consumers.

Why did 127V persist instead of a neat 120V or 110V?

• Over time, Brazil adopted the nominal voltage of 127V because of legacy power system engineering choices, aiming to slightly boost distribution efficiency while remaining compatible with older 110–115V equipment.
• Official ANEEL tolerance allowed slight voltage variations around nominal levels, making “127V” an optimal compromise between historical equipment compatibility (110–120V) and slightly improved energy efficiency.

Present-Day Scenario

Today, Brazilian homes commonly feature both voltages, frequently within the same city or building:

• South and Northeast: Typically 220V residentially.
• Southeast (São Paulo, Rio, Minas Gerais): Usually 127V for general use, but 220V for high-power appliances (air conditioners, electric showers, etc.).
• Some northern states use predominantly 127V, others 220V, further emphasizing regional exceptions.

And finally here’s another amusing anecdote from twitter user Priniz:

also some fun fact: The Itaipu electric dam produces both 60hz (Brazil side) and 50 hz (Paraguay side) but since Paraguay is much smaller than Brazil, Brazil buys the electricity from Paraguay, but have to increase the frequency from 50hz to 60hz.