Marblehead Municipal Light Department

Massachusetts Utility Interconnection & net metering rules

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Tariffs and interconnection rules move often. If something here is out of date or missing, tell us and we'll fix it.

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Net Metering AllowedYes
NEM TypeMonthly
Line Taps AllowedNo
Load Taps AllowedNo

Net metering & export

Net Metering Allowed
Yes
NEM Type
Monthly
TOU Utility
No
Post Solar Billing Method
Net Metering
Rebates Offered
No
Deregulated
Yes

Interconnection & taps

Approval Req To Install
Yes
Line Taps Allowed
No
Load Taps Allowed
No
Automatic Transformer Upgrade Size
0

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
Allowed Meter Adapter
None

Plans & docs

Site Plan Reqs

a. Provide fully dimensioned site plan drawn to scale. Show lot size, street, alley, easements, parking spaces, division alls, all projections, location, size and use of all structures on the lot and property line walls. Identify property lines, lot dimensions, distances from building to property lines and property line to street centerlines. b. On the site plan, delineate all projecting elements, and show distance to property line, or adjacent structures. c. Show the size and location of the service meter d. Show the required working clearances around the Service meter main, AC Disconnect, Inverters, and DC disconnects. e. Show the required access, pathways, and smoke ventilation clearances around the arrays.

SLD Reqs

Provide a minimum of a single-line diagram with the permit application package showing: a. Array configuration b. Array wiring identified c. Combiner/junction box identified d. Conduit and size from junction box to PV power source disconnect identified e. Equipment grounding specified f. Disconnect specified g. Conduit and size from disconnect to inverter identified h. Inverter specified i. Conduit and size from inverter to AC disconnect to panel identified j. System grounding specified k. Point of connection attachment method identified

Placards

refer to pg. 4 on installation guidelines

Website
link
Phone
(781) 631-5600
Compiled from public records, 2026. Tariffs and interconnection rules change; verify with Marblehead Municipal Light Department 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.