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AMERESCO4. <br />Measured Variables <br />• Power Output (kW) through a Revenue Grade Power Meter with accuracy +/- 0.2% <br />Monitored Variables <br />• Plane -of -Array (POA) Irradiance (W/m2) through a Pyranometer or Reference Cell <br />• Ambient Temperature (°C) through a Weather Station or Ambient Air Temperature Sensor <br />• Wind Speed (m/s) through a Weather Station or Anemometer <br />• Operations & Maintenance (O&M) records provided by O&M provider. <br />Calculation of Energy Savings <br />Guaranteed production values were developed using Typical Meteorological Year (TMY3) data, which <br />simulates meteorological conditions in an average year. To account for variations between average <br />expected weather and actual observed weather, an adjustment for the actual weather conditions will be <br />applied to the guaranteed production value after each Performance Period. The weather adjustment <br />factor will utilize the regression coefficients obtained from commissioning for statistically significant <br />factors (Pvalue > 0.05), typically irradiance, ambient temperature, and wind speed. An operations & <br />maintenance (O&M) adjustment will be applied for outstanding maintenance tasks that impact system <br />performance. Additionally, the guaranteed production values are subjected to an industry standard <br />0.5% annual degradation rate. The formula for Guaranteed Production in Year N is defined as: <br />GuaranteeN = 95% * PVSYST_Projection * (1 — 0.5%)N * Weather_AdjustN * 0&M_AdjustN <br />sites <br />Energy cost savings will be calculated in each performance period. Utility rates are specified and <br />assume an annual escalation rate of 3.0%. Energy cost savings in Year N are defined as: <br />Expected Energy Cost SavingsN = GuaranteeN * Utility Rateo * (1 + 3%)N <br />sites <br />Actual Energy Cost SavingsN = Measured kWh * Utility Rateo * (1 + 3%)N <br />sites <br />Annual Inspection Plan <br />Ameresco will periodically review Measured and Monitored Variables to ensure proper system <br />operation. Performance Period M&V will involve a reconciliation of expected energy production and <br />actual energy production, taking into account actual weather conditions. An Annual Report will be <br />provided to the Customer documenting the total amount of energy produced by the system for a given <br />performance year. <br />City of South Bend, IN I Department of Public Works I RFQ Guaranteed Energy Savings Contract <br />