Common use of Calculation of Measured Performance Ratio Clause in Contracts

Calculation of Measured Performance Ratio. The Measured Performance Ratio ("MPR") represents the PV System's measured AC power output compared to its theoretical DC power output as adjusted for the plane of array irradiance conditions measured at the Site [Drafting Note: May require revision for DC output]. The gross PV System output in MW and MVAR will be measured at such point mutually agreed to by the Parties on the Facility's single-line diagram attached hereto as Attachment E (Single-Line Drawing and Interface Block Diagram). Following the end of each MPR Assessment Period, the MPR shall be calculated for such MPR Assessment Period (using the previous 12 months of data) as follows: Where: = each 15-minute interval during the MPR Assessment Period where the inverter input voltage exceeds the PV System inverters minimum level for production is the measured AC power output of the PV System measured at the inverters averaged over time period in MW = plane of array irradiance at the standard condition of 1,000 is the DC rated capacity of the PV System at the standard test conditions of 1,000 W/m2 and 25°C (MW), (i.e., the DC power rating of the PV panels at standard test conditions multiplied by the number of PV panels in the Facility); is the measured plane of array irradiance averaged over time period i ( / ); = cell temperature computed from measured meteorological data (°C) averaged over time period i. = average cell temperature computed from one year of weather data using the project weather file (°C) δ = temperature coefficient for power (%/°C, negative in sign) that corresponds to the installed modules Tcell_i = GPOA * e(a+b*WS) +Ta Where: Tm = module back-surface temperature [°C] GPOA = POA irradiance from calibrated reference cells [W/m2] Ta = ambient temperature [°C] WS = the measured wind speed corrected to a measurement height of 10 meters [m/s] a = empirical constant reflecting the increase of module temperature with sunlight b = empirical constant reflecting the effect of wind speed on the module temperature [s/m] e = Euler's constant and the base for the natural logarithm. Table 2. Empirical Convective Heat Transfer Coefficients Module Type Mount a b Glass/cell/glass Open rack -3.47 -0.0594 Glass/cell/glass Close-roof mount -2.98 -0.0471 Glass/cell/polymer sheet Open rack -3.56 -0.0750 Glass/cell/polymer sheet Insulated back -2.81 -0.0455 Polymer/thin-film/steel Open rack -3.58 -0.1130 The time periods used in the foregoing calculation shall be only periods during which, for the entire 15-minute interval, the PV System output is allowed to convert all irradiance to xxxxx XX power and is not offline due to insufficient irradiance levels based on the inverter minimum requirements for production. Data points that will be excluded are limited to data points where: (A) the GPOA is below minimum threshold, (B) GPOA above the maximum threshold (C) the PV System is in RSH, (D) when there is a EUDH or EPDH, (E) the PV System was not allowed to convert the full DC output to AC energy; or (F) when there is any other Outage. The aforementioned 15-minute intervals are fixed intervals that commence, in sequence, at the top of each hour and at 15, 30 and 45 minutes past the hour. At the end of each month, Seller shall provide Company a report that lists all hours when such excluded data points occur (from the Facility’s SCADA system as necessary) to validate the exclusion of any data points from the calculation set forth in Section 2(a)(ii) above. This information shall be validated on a monthly basis. MPR Test. In the event that the set of operational data points under Section 2.6(a)(iii) that is available for any month to calculate the MPR cannot be validated to Company's reasonable satisfaction or in the event there were not at least 16 such data points during such month that could be used to calculate the MPR, the Company shall have the right to perform a test ("MPR Test") to collect the data points for such month to be used to calculate the MPR in lieu of the use of operational data for such month. The Company shall retain sole discretion as to when to conduct the MPR Test and the MPR Test may be conducted at any point during the month following the month for which Company was either unable to validate the set of operational data points for such month or there were not at least 16 data points available during such month, provided that Company will provide Seller three (3) Business Days’ notice prior to conducting the MPR Test. The MPR Test shall have a minimum duration of four (4) hours and shall run until at least 16 data points are collected that meet the criteria set forth in Section 2(a)(iii), subject to the limitation set forth in the last sentence of this Section 2(a)(iv). To the extent possible, the Company shall schedule the MPR Test for a period where all inverters in the PV System are available and weather conditions are expected to be optimum allowing the PV System to generate at full capacity for the duration of the MPR Test (if possible). However, if Company chooses a period where inverter(s) are unavailable, shall be adjusted to remove the expected contribution of the unavailable inverter(s). For each MPR Assessment Period that includes one or more months for which a MPR Test was performed, the data points collected during said MPR Test for such month(s) shall be used together with the data points for months for which an MPR Test was not conducted to calculate the MPR for the MPR Assessment Period in question using the formula set forth in Section 2(a)(ii) above. The result of the calculation based on the MPR Test shall be the MPR for the MPR Assessment Period in question.

Calculation of Measured Performance Ratio. The Measured Performance Ratio ("MPR") represents the PV System's measured AC power output compared to its theoretical DC power output as adjusted for the plane of array irradiance conditions measured at the Site [Drafting Note: May require revision for DC output]. The gross PV System output in MW and MVAR will be measured at such point mutually agreed to by the Parties on the Facility's single-line diagram attached hereto as Attachment E (Single-Line Drawing and Interface Block Diagram). Following the end of each MPR Assessment Period, the MPR shall be calculated for such MPR Assessment Period (using the previous 12 months of data) as follows: Where: = each 15-minute interval during the MPR Assessment Period where the inverter input voltage exceeds the PV System inverters minimum level for production is the measured AC power output of the PV System measured at the inverters averaged over time period in MW = plane of array irradiance at the standard condition of 1,000 is the DC rated capacity of the PV System at the standard test conditions of 1,000 W/m2 and 25°C (MW), (i.e., the DC power rating of the PV panels at standard test conditions multiplied by the number of PV panels in the Facility); is the measured plane of array irradiance averaged over time period i ( / ); = cell temperature computed from measured meteorological data (°C) averaged over time period i. = average cell temperature computed from one year of weather data using the project weather file (°C) δ = temperature coefficient for power (%/°C, negative in sign) that corresponds to the installed modules Tcell_i = GPOA * e(a+b*WS) +Ta Where: Tm = module back-surface temperature [°C] GPOA = POA irradiance from calibrated reference cells [W/m2] Ta = ambient temperature [°C] WS = the measured wind speed corrected to a measurement height of 10 meters [m/s] a = empirical constant reflecting the increase of module temperature with sunlight b = empirical constant reflecting the effect of wind speed on the module temperature [s/m] e = Euler's constant and the base for the natural logarithm. Table 2. Empirical Convective Heat Transfer Coefficients Module Type Mount a b Glass/cell/glass Open rack -3.47 -0.0594 Glass/cell/glass Close-roof mount -2.98 -0.0471 Glass/cell/polymer sheet Open rack -3.56 -0.0750 Glass/cell/polymer sheet Insulated back -2.81 -0.0455 Polymer/thin-film/steel Open rack -3.58 -0.1130 The time periods used in the foregoing calculation shall be only periods during which, for the entire 15-minute interval, the PV System output is allowed to convert all irradiance to xxxxx XX power and is not offline due to insufficient irradiance levels based on the inverter minimum requirements for production. Data points that will be excluded are limited to data points where: (A) the GPOA is below minimum threshold, (B) GPOA above the maximum threshold (C) the PV System is in RSH, (D) when there is a EUDH or EPDH, (E) the PV System was not allowed to convert the full DC output to AC energy; or (F) when there is any other Outage. The aforementioned 15-minute intervals are fixed intervals that commence, in sequence, at the top of each hour and at 15, 30 and 45 minutes past the hour. At the end of each month, Seller shall provide Company a report that lists all hours when such excluded data points occur (from the Facility’s SCADA system as necessary) to validate the exclusion of any data points from the calculation set forth in Section 2(a)(ii) above. This information shall be validated on a monthly basis. MPR Test. In the event that the set of operational data points under Section 2.6(a)(iii) that is available for any month to calculate the MPR cannot be validated to Company's reasonable satisfaction or in the event there were not at least 16 such data points during such month that could be used to calculate the MPR, the Company shall have the right to perform a test ("MPR Test") to collect the data points for such month to be used to calculate the MPR in lieu of the use of operational data for such month. The Company shall retain sole discretion as to when to conduct the MPR Test and the MPR Test may be conducted at any point during the month following the month for which Company was either unable to validate the set of operational data points for such month or there were not at least 16 data points available during such month, provided that Company will provide Seller three (3) Business Days’ notice prior to conducting the MPR Test. The MPR Test shall have a minimum duration of four (4) hours and shall run until at least 16 data points are collected that meet the criteria set forth in Section 2(a)(iii), subject to the limitation set forth in the last sentence of this Section 2(a)(iv2.6(a)(iv). To the extent possible, the Company shall schedule the MPR Test for a period where all inverters in the PV System are available and weather conditions are expected to be optimum allowing the PV System to generate at full capacity for the duration of the MPR Test (if possible). However, if Company chooses a period where inverter(s) are unavailable, shall be adjusted to remove the expected contribution of the unavailable inverter(s). For each MPR Assessment Period that includes one or more months for which a MPR Test was performed, the data points collected during said MPR Test for such month(s) shall be used together with the data points for months for which an MPR Test was not conducted to calculate the MPR for the MPR Assessment Period in question using the formula set forth in Section 2(a)(ii) above. The result of the calculation based on the MPR Test shall be the MPR for the MPR Assessment Period in question.

Calculation of Measured Performance Ratio. The Measured Performance Ratio ("MPR") represents the PV System's measured AC power output compared to its theoretical DC power output as adjusted for the plane of array irradiance conditions measured at the Site [Drafting Note: May require revision for DC output]. The gross PV System output in MW and MVAR will be measured at such point mutually agreed to by the Parties on the Facility's single-line diagram attached hereto as Attachment E (Single-Line Drawing and Interface Block Diagram). Following the end of each MPR Assessment Period, the MPR shall be calculated for such MPR Assessment Period (using the previous 12 months of data) as follows: Where: = each 15-minute interval during the MPR Assessment Period where the inverter input voltage exceeds the PV System inverters minimum level for production is the measured AC power output of the PV System measured at the inverters averaged over time period in MW = plane of array irradiance at the standard condition of 1,000 is the DC rated capacity of the PV System at the standard test conditions of 1,000 W/m2 and 25°C (MW), (i.e., the DC power rating of the PV panels at standard test conditions multiplied by the number of PV panels in the Facility); is the measured plane of array irradiance averaged over time period i ( / ); = cell temperature computed from measured meteorological data (°C) averaged over time period i. = average cell temperature computed from one year of weather data using the project weather file (°C) δ = temperature coefficient for power (%/°C, negative in sign) that corresponds to the installed modules Tcell_i = GPOA * e(a+b*WS) +Ta Where: Tm = module back-surface temperature [°C] GPOA = POA irradiance from calibrated reference cells [W/m2] Ta = ambient temperature [°C] WS = the measured wind speed corrected to a measurement height of 10 meters [m/s] a = empirical constant reflecting the increase of module temperature with sunlight b = empirical constant reflecting the effect of wind speed on the module temperature [s/m] e = Euler's constant and the base for the natural logarithm. Table 2. Empirical Convective Heat Transfer Coefficients Module Type Mount a b Glass/cell/glass Open rack -3.47 -0.0594 Glass/cell/glass Close-roof mount -2.98 -0.0471 Glass/cell/polymer sheet Open rack -3.56 -0.0750 Glass/cell/polymer sheet Insulated back -2.81 -0.0455 Polymer/thin-film/steel Open rack -3.58 -0.1130 The time periods used in the foregoing calculation shall be only periods during which, for the entire 15-minute interval, the PV System output is allowed to convert all irradiance to xxxxx XX power and is not offline due to insufficient irradiance levels based on the inverter minimum requirements for production. Data points that will be excluded are limited to data points where: (A) the GPOA is below minimum threshold, (B) GPOA above the maximum threshold (C) the PV System is in RSH, (D) when there is a EUDH or EPDH, (E) the PV System was not allowed to convert the full DC output to AC energy; or (F) when there is any other Outage. The aforementioned 15-minute intervals are fixed intervals that commence, in sequence, at the top of each hour and at 15, 30 and 45 minutes past the hour. At the end of each month, Seller Subscriber Organization shall provide Company a report that lists all hours when such excluded data points occur (from the Facility’s SCADA system as necessary) to validate the exclusion of any data points from the calculation set forth in Section 2(a)(ii) above. This information shall be validated on a monthly basis. MPR Test. In the event that the set of operational data points under Section 2.6(a)(iii) that is available for any month to calculate the MPR cannot be validated to Company's reasonable satisfaction or in the event there were not at least 16 such data points during such month that could be used to calculate the MPR, the Company shall have the right to perform a test ("MPR Test") to collect the data points for such month to be used to calculate the MPR in lieu of the use of operational data for such month. The Company shall retain sole discretion as to when to conduct the MPR Test and the MPR Test may be conducted at any point during the month following the month for which Company was either unable to validate the set of operational data points for such month or there were not at least 16 data points available during such month, provided that Company will provide Seller Subscriber Organization three (3) Business Days’ notice prior to conducting the MPR Test. The MPR Test shall have a minimum duration of four (4) hours and shall run until at least 16 data points are collected that meet the criteria set forth in Section 2(a)(iii), subject to the limitation set forth in the last sentence of this Section 2(a)(iv2.6(a)(iv). To the extent possible, the Company shall schedule the MPR Test for a period where all inverters in the PV System are available and weather conditions are expected to be optimum allowing the PV System to generate at full capacity for the duration of the MPR Test (if possible). However, if Company chooses a period where inverter(s) are unavailable, shall be adjusted to remove the expected contribution of the unavailable inverter(s). For each MPR Assessment Period that includes one or more months for which a MPR Test was performed, the data points collected during said MPR Test for such month(s) shall be used together with the data points for months for which an MPR Test was not conducted to calculate the MPR for the MPR Assessment Period in question using the formula set forth in Section 2(a)(ii) above. The result of the calculation based on the MPR Test shall be the MPR for the MPR Assessment Period in question.