Skip ribbon commands
Skip to main content

2.1 General

Metering equipment must comply with Measurement Canada requirements and be approved by EDTI.

The metering equipment must be:

  • Suitable for use in the environmental conditions reasonably expected to occur at the installation site over the course of a typical year.
  • Appropriate for the power system characteristics reasonably expected to exist at the installation site under all power system conditions and events.

The primary side of the interconnection transformer, which is the side connected to EDTI’s system, is the metering billing point for the DERP’s generation export conditions. The low side of the interconnection transformer, which is the side connected to the DERP’s facilities, is the metering billing point for the DERP’s import conditions. On all installations where the metering equipment is installed on the low side of the interconnecting transformer, transformer loss compensation, when required, will be applied in EPCOR's billing system of record at a rate of 1% except if superseded by AESO regulation or if supplanted by a customer-specific loss factor approved by a professional electrical engineer or registered electrical technologist in the Province of Alberta and submitted to and approved by EPCOR. 

2.2 Metering Requirements

​Metering requirements will be determined by EDTI based on the type and size of a DER. EDTI will provide and install meters at DER facilities (all meters will be bidirectional. Commercial/industrial meters will have four quadrants capability). The installation may require additional metering cabinets, metering cells and a dedicated 120 Volt AC supply to each meter cabinet. The DERP shall be required to cover the costs of additional equipment, if applicable. EDTI shall own, and have safe access to all metering equipment, including instrument transformers at all metering locations. The DERP will also be required to comply with all the metering requirements specified in section 8 of EDTI's Customer Connection Guide

2.3 Measurement Transformers

The applicable winding(s) of the current and potential instrument transformers must:

  • Be approved by Measurement Canada for revenue metering.
  • Be burdened to a degree that does not compromise the accuracy required by this guideline.
  • Have an accuracy class rating that equals or exceeds the values specified in Appendix V.
2.4 Remote Communications Equpment
EDTI's advanced metering infrastructure incorporates two-way communications via radio.  As such, where the metering cabinet is indoors, the DERP must provide a conduit from the metering cabinet to the outside, to accommodate a coaxial antenna cable. 
2.5 Safety Requirements

The installation shall conform to the requirements of:

  • Measurement Canada Standard Drawings.
  • CSA Standard C22.2.
  • ANSI/IEEE C57.13.3-1983 IEEE Guide for the Grounding of Instrument Transformer Secondary Circuits and Cases.