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| ???? – 2009 | 2009–2015 | 2015–2023 | 2023–present |
EnergyEast[]
????–2009[]
Iberdrola USA[]
2009–2015[]
Avangrid[]
2015–2023[]
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):  |