CMP - Central Maine Power

Maine Utility Interconnection & net metering rules

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Net Metering AllowedYes
NEM TypeAnnual
Line Taps AllowedYes
Load Taps AllowedYes
AC Disconnect RequiredYes

Net metering & export

Net Metering Allowed
Yes
NEM Type
Annual
TOU Utility
Yes
Post Solar Billing Method
Net Metering
Solar Export Type
N/A
Net Excess Generation Notes

If the electricity generated during the billing period by the eligible facility plus any kilowatt-hour credits from prior billing periods exceed the customer's or the shared financial interest customers’ kilowatt-hour usage during the billing period, the excess shall be applied to the customer's bill or the shared financial interest customers’ bills for the following billing period as a reduction in the customer's kilowatt-hour usage.

Rebates Offered
No
Deregulated
Yes
Allows Standby
Yes

Interconnection & taps

Approval Req To Install
Yes
Line Taps Allowed
Yes
Load Taps Allowed
Yes
Tap Criteria
  • Branch preference: If the house has Meter Main, load side tap vs breaker tie in in the MSP inside the house.
Automatic Transformer Upgrade Size
0
Meter Aggregation Allowed
Yes

System size & offset

System Size Restrictions
0
System Size Restriction Type
No Restrictions
System Size Battery Included
No
System Size Includes Existing Systems
No
Offset Type
No Restrictions
Offset Value
0
Offset Calculation Period
0
Industry Standard Watts Sqft
2
Offset Calc Tool
N/A

Metering & disconnect

Production Meter Required
No
Production Meter Position
N/A
Production Meter Labeling
N/A
AC Disconnect Required
Yes
AC Disconnect Labeling
Visible Lockable Labeled Disconnect
Meter Spot Required
No
Allowed Meter Adapter
None

Plans & docs

Site Plan Reqs

All Jobs:

  • PORTRAIT HIGHLY PREFERRED FOR ALL PROJECTS (EXCEPT CASH/MOSAIC ON COMP SHINGLE)
  • 8 MODS PER STRING MINIMUM; 15 MAXIMUM
SLD Reqs
  • Line Diagram (Level 2-4 must be PE stamped, level 2 is 25kW - 2MW) 


Electrical Stamp Required
No
Meter Num Req SLD 3LD
Yes
ESID Num Req SLD 3LD
No
Site Plan Notes


Electrical Diagram Notes


Website
link

Other details

Revision Required
Yes
Mod Swap Requires Planset
Yes
Compiled from public records, 2026. Tariffs and interconnection rules change; verify with CMP - Central Maine Power before you rely on this. The useful move: if an installer says you need a main panel upgrade, ask how these tap and interconnection policies were considered first.