−Removed: As of December 31, 2024, Unitil owned through its natural gas and electric distribution utilities, five utility operating centers located in New Hampshire, Maine and Massachusetts.
+Added: As of December 31, 2025, Unitil owned through its natural gas and electric distribution utilities, seven utility operating centers located in New Hampshire, Maine and Massachusetts.
The Company’s real estate subsidiary, Unitil Realty, owns the Company’s corporate headquarters building and the land on which it is located in Hampton, New Hampshire.
−Removed: Unitil Realty also owns land for future use in Kingston, New Hampshire.
+Added: Unitil Realty also owns land in Kingston, New Hampshire on which Unitil Energy’s solar facility is located that became operational in May 2025.
The following tables detail certain of the Company’s electric and natural gas operations properties.
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Northern Utilities
+Added: Maine Natural
+Added: Granite State
Underground Natural Gas Mains—Miles
11 unchanged sentences
Fitchburg owns a propane air gas plant and an LNG storage and vaporization facility, both of which are located on land owned by Fitchburg in north central Massachusetts.
−Removed: Northern Utilities’ gas mains are primarily made up of polyethylene plastic (84.7%), coated and wrapped cathodically protected steel (15.3%), cast/wrought iron (0.0%), and unprotected bare and coated steel (0.0%).
+Added: Northern Utilities’ gas mains are primarily made up of polyethylene plastic (84.8%) and coated and wrapped cathodically protected steel (15.2%).
FG&E’s gas mains are primarily made up of polyethylene plastic (49.5%), coated steel (42.9%), cast iron (6.6%), bare steel (0.9%), and wrought and ductile iron (0.1%).
+Added: Bangor’s gas mains are primarily made up of polyethylene plastic (70.2%), coated and wrapped cathodically protected steel (29.6%), and unprotected bare and coated steel (0.2%).
+Added: Maine Natural’s gas mains are primarily made up of polyethylene plastic (89.4%), and coated and wrapped cathodically protected steel (10.6%).
Granite State’s underground natural gas transmission pipeline, regulated by the FERC, is located primarily in Maine and New Hampshire.
1 unchanged sentence
Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.