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| 2004–2017 | 2017–2023 | 2023–present |
2004–2017[]
2017–2023[]
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):  |