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City of Mascoutah

Illinois Utility Interconnection & net metering rules
Net Metering Allowed1
NEM TypeMonthly
Line Taps Allowed0
Load Taps Allowed0
AC Disconnect RequiredYes

Net metering & export

Net Metering Allowed
1
NEM Type
Monthly
TOU Utility
0
Post Solar Billing Method
Net Metering
Net Excess Generation Notes

For any excess energy generated by the customer from an approved on-site generating facility and delivered by the customer to the utility at the meter, as reflected in the meter reading, a credit shall be created and applied to the customer’s bill based upon the lesser of the full retail energy rate for the customer class and the avoided cost of energy. $0.0538 NEM Policy

Rebates Offered
0
Deregulated
0
Allows Standby
1

Interconnection & taps

Approval Req To Install
Yes
Interconnection Level
3
Line Taps Allowed
0
Load Taps Allowed
0
Tap Criteria

Piercing connectors not allowed

Automatic Transformer Upgrade Size
0
Meter Aggregation Allowed
0

System size & offset

System Size Restriction Type
AC kW
System Size Battery Included
0
System Size Includes Existing Systems
0
Offset Value
0
Offset Calculation Period
0
Industry Standard Watts Sqft
2
System Offset Notes

Must be properly sized to not exceed the customers expected annual usage based on the customers current needs. Customer’s energy usage will be analyzed using 36-months of historical energy usage (if available) in order to calculate the customer’s expected annual usage. If a customer provides documentation specifying why the usage has increased over that time, such as home renovation/addition or installation of electric heating or an electric vehicle charging station on the premises, then the previous 12-month period shall be used to determine the average for the expected annual usage.

Offset Calc Tool
Historical Usage

Metering & disconnect

Production Meter Required
No
AC Disconnect Required
Yes
Allowed Meter Adapter
None

Plans & docs

Site Plan Reqs

Standard

SLD Reqs

Must include location of the inverter, disconnect and POI.

Electrical Stamp Required
1
Equipment Approvals
California Energy Commission
Electrical Diagram Notes

Utility requires a engineer sealed letter signing off that the trusses will hold the weight of the PV panels

Website
link

Other details

Restrict Inspection
1
Revision Required
1
Mod Swap Requires Planset
1
Address ID
2230017
Express Planset Eligible
Yes
Compiled from public records, 2026. Tariffs and interconnection rules change; verify with City of Mascoutah 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.