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Sun Prairie Utilities

Wisconsin Utility Interconnection & net metering rules
Net Metering Allowed1
NEM TypeMonthly
Supply Side Taps Allowed0
Line Taps Allowed0
Load Taps Allowed0

Net metering & export

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

1. Parallel Generation (20 kW or less) - Net Energy Billing (see Pgs-1 Rate Schedule). Customers that qualify for this rate schedule are metered and billed under a net energy basis. The revenue meter records all energy delivered and all energy received from the DG facility during the billing period.


2. Customer-Owned Generation Systems (greater than 20 kW) - (see Pgs-2 Rate Schedule). Customers that qualify for this rate schedule are metered and billed for all energy consumed at their retail rate and receive a credit for all energy delivered to the utility. The revenue meter records all on/off peak energy delivered and all on/off peak energy received from the facility during the billing period.

Rebates Offered
1
Deregulated
0

Interconnection & taps

Approval Req To Install
Yes
Interconnection Level
3
Supply Side Taps Allowed
0
Line Taps Allowed
0
Load Taps Allowed
0
Automatic Transformer Upgrade Size
0

System size & offset

System Size Restrictions
20
System Size Restriction Type
AC kW
System Size Battery Included
0
System Size Includes Existing Systems
0
Offset Type
No Restrictions
Offset Value
0
Offset Calculation Period
0
Industry Standard Watts Sqft
2
System Offset Notes

The “20 kW” rating shall be the AC rating of the generator or inverter.

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

Street address of DG facility

Adjoining street name

Electric service entrance

Electric meter

Interface equipment

Location of major equipment

Location of interconnect disconnect switch (if required)


• System capacity must be 0.5 kWDC or greater.

• System must be installed within 90 degrees of due south. (Azimuth)

• Must be installed with a panel tilt between 10-50 degrees.

• Must have less than 10 percent obstacle shading based on analysis of an industry-accepted tool.

SLD Reqs

Generator or inverter

Point where DG facility is electrically connected to the customer’s electrical system

Point of common coupling

Lockable interconnection disconnect switch (outside, if required)

Method of grounding, including generator and ]transformer ground connections

Protection function and systems

Website
link
Phone
(608) 837-5500

Other details

Restrict Inspection
0
Address ID
167988
Express Planset Eligible
Yes
Compiled from public records, 2026. Tariffs and interconnection rules change; verify with Sun Prairie Utilities 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.