- (1) Electric utilities must use electric meters or other such devices to accurately record or indicate the quantity of electricity sold to customers. Such measuring devices will allow utilities to calculate a customer's consumption in units of kilowatt hours or other units as filed in the company's tariffs.
- (2) Electric utilities that decide to either measure a customer's consumption with a device that employs a multiplier or calculate consumption from recording devices must provide customers, upon request, information sufficient to enable the customer to compute the quantity consumed.
- (3) Indirect reading meters and those that operate from instrument transformers must have the multiplier plainly marked on the dial of the instrument or be otherwise suitably marked.
- (4) The watt-hour constant for the meter itself must be placed on all watt-hour meters (as specified in ANSI C12.1). Information about the ANSI C12.1 regarding the version adopted and where to obtain it is set out in WAC 480-100-999 Adoption by reference.
- (5) Measuring devices that have the capability to do so must measure all energy sold to customers at a minimum of sixty-minute intervals for residential customers and fifteen-minute intervals for nonresidential customers.
[Statutory Authority: RCW 80.01.040, 80.04.160, and chapter 80.28 RCW. WSR 20-16-077 (Docket U-180525, General Order R-600), § 480-100-318, filed 7/29/20, effective 8/29/20. Statutory Authority: RCW 80.01.040 and 80.04.160. WSR 01-11-004 (Docket No. UE-990473, General Order No. R-482), § 480-100-318, filed 5/3/01, effective 6/3/01.]