This credit interpretation request is in reference to Energy and Atmosphere Credit 5 for Measurement and Verification (M&V) at the 725,000 ft2 North Bay Regional Health Centre. Our approach is Option D as described in the Reference Guide and IPMVP document. This credit requires that 10 end-uses be measured, in a manner that provides for the "ongoing accountability and optimization of building performance over time." Our overall measurement and verification approach is very comprehensive and includes individual metering for 9 of the end uses as well as an extensive metering system including 40 individually metered loads throughout the building, consisting of both lighting and miscellaneous loads. We would like clarification that our lighting measurement approach is also acceptable. In this facility we have separate meters for the incoming power supply to the building as a whole, for each substation, for each pod and for each floor (or in the case of the diagnostic building, for each quarter of the building block), on both emergency and normal power. Although the lighting panels in this facility are not separate from the other power panels, this level of metering allows us to effectively isolate and troubleshoot problems as required. This is also useful in identifying and explaining changes in energy consumption in the highly transient hospital environment. Our M&V plan will identify the methodology by which this will be achieved. By compiling energy consumption data on a monthly basis for each pod and comparing it to consumption in previous months of the same season (or to the same month in a previous year), we are able to determine if power use has varied significantly and, if so, an investigation into the causes for this variance shall be undertaken. Having forty separate metering locations throughout the facility makes this a task that is manageable by considerably narrowing down the region of investigation. We believe this meets the credit intent. Because a large portion of switchable hospital lighting and equipment is on emergency power, we propose to use the same approach for the emergency panels. Our question is as follows: With respect to monitoring lighting use, is it acceptable to monitor both lighting plus the miscellaneous loads at each floor of each pod (or, in the case of the diagnostic building, in each quarter of the building). This will identify changes in usage in a limited area allowing for a concentrated investigation into the cause and prompt correction of the problem.