Wisconsin
Power factor correction in Sun Prairie, WI
How power factor is billed in Sun Prairie, when correcting it is worth doing, and how to get your own bill reviewed.
Which utility serves Sun Prairie?
The research identifies Sun Prairie Utilities as the delivery utility serving Sun Prairie. Confirm your facility's utility from its bill or service address; postal addresses and service boundaries can differ.
The utility says it serves 'customers in and around the City of Sun Prairie'. Alliant's page also lists Sun Prairie (Electric), so WPL may serve some fringe or annexed areas. Not verified.
Territory source: Sun Prairie Utilities territory listing.
Sun Prairie's own electric utility
Sun Prairie is served by a municipal utility, Sun Prairie Utilities (municipal), which sets its own retail rates and rules rather than following a state-wide investor-owned utility. No power-factor charge on any commercial schedule. Demand is billed in kW. There are 90% power-factor requirements for some equipment and for customer-owned generation.
Source: Sun Prairie Utilities electric rate file (PSCW rate-file sheets), Cp-1, Cp-2, Cp-3 sheets; Schedule X-1 Rule 116.
The power-factor rule
Sun Prairie Utilities No power-factor charge found
No power-factor charge on any commercial schedule. Demand is billed in kW. There are 90% power-factor requirements for some equipment and for customer-owned generation.
Gs-1, Gs-2, Cp-1 (over 40–200 kW), Cp-2 (200–1,000 kW), Cp-3 (over 1,000 kW). Applies to: All commercial and industrial customers. The Cp schedules have no power-factor clause. Rule 116 requires single-phase equipment on a three-phase service to maintain a 90% power factor, and schedule Pgs-2 requires a 90% net power factor for customer generation of 20–100 kW.
As checked 2026-10-03. Sun Prairie Utilities's full rules, tariff quotes and sources →
Is correction worth it in Sun Prairie?
No power-factor charge on any commercial schedule. Demand is billed in kW. There are 90% power-factor requirements for some equipment and for customer-owned generation. With no billing adjustment, correction has to pay for itself in other ways: freeing transformer and switchgear capacity before an expansion, lowering losses and voltage drop on heavily loaded feeders, or meeting a utility requirement. If you have drives, harmonics are often the bigger issue.
Working with us in Sun Prairie
Sun Prairie is about 60 miles from our Brookfield office, measured straight-line. Send your bills and available measurement data to discuss the appropriate next step and whether site work can be arranged.
Nearby
Madison, WI · Janesville, WI · Beloit, WI · Waukesha, WI · all service areas