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Alliant Energy (WI)

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

Net metering & export

Net Metering Allowed
1
TOU Utility
1
Post Solar Billing Method
Net Metering
Net Excess Generation Notes

20 kW AC or Less

Energy charges are specified in the rate schedule under which the (R) customer purchases energy. The customer’s energy consumption shall be offset by energy produced from the customer’s generation facilities for the billing month. When the energy produced exceeds energy consumed for the billing month, the customer shall be credited for the excess energy volumes at a per kWh rate equal to the rate levels in Section 3, subsection b. 2) of this rate schedule. Time-of-day customers will have consumption and production netted by pricing period under the rate schedule in which the customer purchases energy. 

Special provision applicable to paragraphs 3.b.1)-2) above. If in any month, the customer's bill has a credit balance of $100 or less the amount shall be credited to a subsequent bill until a debit balance is reestablished. The energy purchased by the company for customers generating power in excess of 20 kW shall be limited to 20 kW times the number of hours in the billing month.

Over 20 kW AC

Buy-All Sell-All: Tariff is available in the database files section

Rebates Offered
1
Deregulated
0
Allows Standby
1

Interconnection & taps

Approval Req To Install
Yes
Interconnection Level
3
Supply Side Taps Allowed
1
Line Taps Allowed
0
Load Taps Allowed
0
Tap Criteria


Automatic Transformer Upgrade Size
0

System size & offset

System Size Restrictions
0
System Size Restriction Type
No Restrictions
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

Metering & disconnect

Production Meter Required
No
Allowed Meter Adapter
None

Plans & docs

SLD Reqs
  • AC DSCO to be labeled as lockable, and fully accessible
  • PV Breaker is preferred POI

Battery Projects

  • Disconnect required between gateway and utility meter.
Electric Service Reqs

The utility meter cannot be located inside


A. Preferred Methods

  1. DG connected via properly sized sub-breaker downstream from the main in service panel
  2. Meter socket with Main for Alternative Energy (See ESE e-manual E106A)
  3. Meter socket with factory installed dual lugs, 320A (See ESE e-manual E106B)
  4. Attached to metering transformer cabinet with available lugs

B. Optional Method

  1. Properly sized UL Listed NEMA 3R sealable bussed gutter PXVW_x0003_EH_x0003_LQVWDOOHG_x0003_RXWVLGH
  2. Properly sized UL Listed NEMA 3R Termination Box PXVW_x0003_EH_x0003_LQVWDOOHG_x0003_RXWVLGH

C. Not Permitted when connecting DG on the line side of customer’s service entrance overcurrent protective device (Breaker/Fuse).

  1. Splices
  2. Split bolts
  3. Tap connectors
  4. Insulation piercing connectors
  5. Installing more cables than lugs are designed to handle
  6. Modifying or installing lugs on any equipment on the line side of the overcurrent protective device, other than what is listed on the manufacturer’s drawing associated with the UL Listing
  7. Any other modifications to meter sockets or metering transformer cabinets
Placards
  • It is the responsibility of the customer to comply with any and all labels required by the NEC or other jurisdictional codes and requirements.
  • Customer shall provide and install a “Dual Power Source” label at the meter socket indicating the operating voltage, maximum current and maximum power of the solar PV system that is installed. Customer shall provide an “Interconnection Disconnect Switch” label at the DG disconnect.
  • Permanent labeling is required; Labeling shall be rigid engraved plastic, engraved self-sticking brass or engraved self-sticking aluminum.
  • Labeling shall use a minimum of ÂĽ inch block lettering.
  • Examples can be found in the utility database files under Electric Service Rules 2022
Website
link
Phone
(800) 255-4268

Other details

Restrict Inspection
1
Revision Required
0
Mod Swap Requires Planset
1
Address ID
162851
Express Planset Eligible
Yes
Compiled from public records, 2026. Tariffs and interconnection rules change; verify with Alliant Energy (WI) 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.