Ipswich 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 If something here is out of date or missing, tell us and we'll fix it.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
AC Disconnect RequiredYes

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
10
System Size Restriction Type
DC kW
System Size Battery Included
No
System Size Includes Existing Systems
No
Offset Type
Combination
Offset Value
90
Offset Calculation Basis
Historical
Offset Calculation Period
12
Industry Standard Watts Sqft
2
Utility Specific Adjustments

Requirements for the current Solar Incentive

  1. Have a capacity of 25 kW DC or less.
  2. Have no more than 20% reduction in output due to shading.
  3. Have an azimuth between 90 (east) and 270 (west) degrees.

If the customer declines the utility incentive or it is unavailable, items 2 and 3 are not required.

System Size Justification
Load Justification
System Offset Notes


Metering & disconnect

Production Meter Required
Yes
Production Meter Position
Inv-PM-Disco-POI
Production Meter Labeling
Production Meter
AC Disconnect Required
Yes
AC Disconnect Labeling
Visible Lockable Labeled Disconnect
Allowed Meter Adapter
None

Plans & docs

Site Plan Reqs
  • Locate BOS equipment and disconnect within 10 feet of the utility meter and in an always-accessible area.
  • If equipment cannot be within 10 feet, contact the utility for guidance.
  • Place meter sockets outdoors.
SLD Reqs
  • AC Disconnect must be a blade-type switch ("knife switch").
Electric Service Reqs


Placards

Disconnect Placard Requirement

  • Label must read: “PV System Isolation Disconnect Switch”
  • Use a red plastic plate with white letters
  • Lettering must be at least ¼ inch tall
Electrical Stamp Required
No
Meter Num Req SLD 3LD
No
ESID Num Req SLD 3LD
No
Website
link
Phone
(978) 356-6635
Compiled from public records, 2026. Tariffs and interconnection rules change; verify with Ipswich 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.