Updated: March 2026
Commercial rate guide for CMP — Southern and central Maine including Portland, Augusta, Lewiston, and coastal communities. Largest electric utility in Maine. Subsidiary of Avangrid/Iberdrola.
Medium general service (MGS) and large general service (LGS) rate schedules with demand charges. Standard offer service sets default supply price through competitive bid process.
Rising
8.3% delivery rate increase effective January 2026 approved by ME PUC for grid r
8.3% delivery rate increase effective January 2026 approved by ME PUC for grid reliability improvements and storm restoration cost recovery
Property managers with CMP accounts frequently encounter these billing challenges:
Standard offer pricing volatility reflecting New England energy market
Demand charges during winter heating season peaks
Estimated meter reads in rural and island communities
Net metering credit calculations for commercial solar
Storm restoration surcharges after nor'easter events
Businesses can choose their energy supplier in this market.
Maine has retail supply choice for commercial customers through competitive electricity providers (CEPs). Delivery regulated by CMP under ME PUC oversight. Standard offer sets default pricing.
Advanced metering infrastructure (AMI) deployment cost recovery petition pending; grid modernization surcharge under ME PUC review
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