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Central Maine Power outlines two‑phase plan to bolster Portland electric grid
Summary
Central Maine Power presented a two‑phase plan to add 115 kV capacity into Portland, including a new Bayside substation and an eventual submarine or underground route to the peninsula; CMP said phase 1 will be filed with regulators this summer and could take about six years to construct.
Central Maine Power officials told the Sustainability and Transportation Committee Wednesday that CMP plans a two‑phase transmission and substation program to relieve capacity and reliability constraints in greater Portland and to support electrification goals.
CMP Senior Director of Integrated System Planning Chris Moore said the utility has identified capacity, asset health and reliability shortfalls across a study area that spans Cumberland to Scarborough and includes the Portland peninsula. Officials said the system currently relies heavily on 34 kV and limited underground transmission into the peninsula; losing a key element in the southern loop could affect tens of thousands of customers.
CMP proposes closing a 115 kV gap by building a new 115 kV line…
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