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The electricity consumption savings (kWh) were then determined by applying the burn hours to the wattage of the existing and proposed fixtures and the taking the difference, as shown in the equation below. kWhsaved = [(kWBase X HrSBase) — (kWRetro X HrSRetro)] Where: • kW,,,S. = Base fixture kW, as per lighting audit calculation • kWRetro = Retrofit fixture kW, as per lighting audit calculation • HrsBm = Base fixture operating hours, as per lighting audit calculation • HrsRetro = Retrofit fixture -operating hours (usually these will equal base hours unless lighting controls are installed), as per lighting audit calculation The burn hours of the base fixtures and retrofit fixtures are the same, except in cases where an occupancy sensor was installed. e sxr tand Verification — The M&V approach for the Lighting Improvements ECM is based on FEMP Option A. This approach entails taking actual measurements of wattage consumption on a sample of the most common fixture types installed as part of this project. Sampling followed a statistical approach with an 80/20 precision and confidence criteria. The electrical contractor utilized a true RMS meter to obtain these measurements. Fixture wattages for fixtures not measured are based on manufacturer's data or equivalent fixture measured data. Operating hours were set forth using the methodology described above and remain constant in all calculations related to energy consumption and savings related to lighting. Once the measurements were obtained, Ameresco grouped the them by fixture type and calculated the actual fixture wattages. These wattages were then inserted back into the spreadsheet calculation to determine the achieved savings. Since wattages are very consistent, and burn hours do not change from year to year, the savings will be realized throughout the full term of the agreement as long as the county continues to repair burned out fixtures with the same equipment that was installed as part of this project. The lighting measurements provided by the lighting contractor are included in the Appendix. ii loll ,,; „o , „; 21 F , City of South Bend .—August 270 2019 37 11. Measurement & Verification "Masse content is subject to ConfidenttlalOty Restrictions"