Wisconsin Administrative Code
Public Service Commission
Chapter PSC 113 - Service Rules For Electrical Utilities
Subchapter X - Electric Service Extension
Section PSC 113.1009 - Revision of estimates to reflect actual cost

The utility shall adjust its estimate of construction costs to reflect the costs that are actually incurred. Upon completion of an installation which differs from the utility's original cost estimate, a recalculation of the customer contribution shall be made using the same method as was used to determine the original contribution. If said recalculation differs by more than $20 from original estimate, a refund or additional billing shall be rendered to the customer.