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| 1998-2004 | 2004-2017 | 2017-2021 | 2021-2023 | 2023-present |
Companhia Energértica do Rio Grande do Norte[]
1998-2004[]
2004-2017[]
2017–2021[]
Neoenergia Cosern[]
2021-2023[]
2023-present[]
| Avangrid (United States): Berkshire Gas | Central Maine Power | Connecticut Natural Gas | Maine Natural Gas | NYSEG | Rochester Gas & Electric | Southern Connecticut Gas | United Illuminating Scottish Power (United Kingdom) Neoenergia (Brazil):  |