Wisconsin Administrative Code
Public Service Commission
Chapter PSC 113 - Service Rules For Electrical Utilities
Subchapter IX - Electric Meter Testing Programs and Record Requirements
Section PSC 113.0926 - Metering with one meter for net energy billing

(1) A single watthour meter may be used for net energy billing where reverse meter registration is intended to occur during reverse power flow through the meter and where the service is rendered under an authorized net-energy billing tariff.

(2) When the meter is operating in the reverse registration mode it shall be accurate within plus or minus 2.0% at 2 unity power factor loads, one equal to 10% and the other 100% of the test ampere rating of the meter. A test to determine compliance with this accuracy requirement shall be made by the utility either before or at the time the customer-owned generator is placed in operation in accordance with utility rules. Subsequent tests for accuracy in the reverse registration mode are required only when requested by the customer and shall be at customer cost.

(3) Each utility shall maintain a record of the reverse-registration tests required in sub. (2) but for such tests the utility is not required to comply with ss. PSC 113.0901, 113.0911 and with 113.0919 respect to meter testing or meter records.