Sterling 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 If something here is out of date or missing, tell us and we'll fix it.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

refer to sample pv plans

SLD Reqs

refer to sample pv plans


"Section 230.67 of the new 2020 NEC requires the installation of a surge-protective device (SPD) for all dwelling unit service entrances. New and replaced electrical equipment and systems must incorporate Type 1 or Type 2 SPDs. Type 1 surge protective devices can be installed before the main disconnect in the load center, at the meter enclosure or on the load side of the main circuit breaker. Type 2 surge protective devices can only be installed on the load side of the main disconnect, attached directly to a circuit breaker. Often, new construction will install Type 1 surge protectors, while renovations will install Type 2 surge protectors, but both types will satisfy the new requirements.

As of July 1, 2021, this state uses the 2020 NEC."

Website
link
Phone
(978) 422-8267
Compiled from public records, 2026. Tariffs and interconnection rules change; verify with Sterling 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.