Application of Measurement Error Correction Factor-Legacy Metering Instrument Transformers (SE-5)

Some legacy Instrument Transformers (IT), those that existed at the time of market opening, do not meet current Market Rule accuracy requirements. In July 2003 the IESO undertook a public consultation on the application of an IT accuracy correction factor (a.k.a. "IT MEC") and the response was overwhelmingly against applying an IT MEC at that time. Considering the metered market participants ("MMPs") input, it was decided to defer the application of an IT MEC until May 1, 2006. The current market rules and associated manuals state that the IESO will apply a MEC factor effective May 1, 2006. The IESO needs to confirm the market's position on this issue so that MMPs can make informed cost/benefit decisions in 2005 to enable them to budget and schedule the replacement of ITs if appropriate to their situation.

• Stakeholder Engagement Plan

Date Agenda/Minutes	Supporting Material
October 14, 2005	Communication of Decision • Application of Measurement Error Correction Factor – Decision
September 27, 2005	Posting of Stakeholder input • Summary • Abitibi Consolidated • AMPCO • Barrie Hydro • Brantford Power • Centre Wellington • Electricity Distributors Association • Enersource • EnWin Powerlines • Falconbridge • Guelph Hydro • Halton Hills • Hydro One • Hydro Ottawa • Ivaco Rolling Mills • London Hydro • Ontario Electricity Financial Corporation • Orangeville Hydro • PowerStream • Rodan Power • Thunder Bay Hydro • Toronto Hydro
September 23, 2005	Closing date for Stakeholder input
September 13, 2005	Posting of Stakeholder input
September 9, 2005	Closing date for Stakeholder input
September 1, 2005 2:00 p.m.	Conference call with interested stakeholders
August 26, 2005	Meeting with Revenue Metering Sub-Committee • Application of Measurement Error Correction Factor – Public Consultation