SCR785  Update RTL calculation to include Real-Time Reserve Price Adder based components

The Real-Time Liability (RTL) component of credit calculations estimates settlement risk for unsettled operating days. RTL currently does not include changes in exposure from Real Time Reserve Price Adder Based on Operating Reserve Demand Curve (ORDC) related calculations. This SCR is to update RTL to include the effect of certain ORDC exposure determinants. 1. Modifies the Real-Time Liability (RTL) calculation to include an estimated amount of the following determinants; a. RTASIAMT (Real-Time Ancillary Service Imbalance Amount) based on calculations defined in paragraphs (6) of Protocol Section 6.7.4 Real-Time Ancillary Service Imbalance Payment or Charge, b. RTRUCRSVAMT (Real-Time RUC Ancillary Service Reserve based on calculations defined in paragraphs (7) of Protocol Section 6.7.4.6 Real-Time Ancillary Service Imbalance Payment or Charge Amount), and c. LAASIRNAMT (Real-Time Ancillary Service Imbalance Revenue Neutrality Allocation) based on calculations defined in Protocol Section 6.7.5 Real-Time Ancillary Service Imbalance Revenue Neutrality Allocation. NPRR 626, "Reliability Deployment Price Adder", also adjusts the RTL calculation to reflect other ORDC determinants that are not within the scope of this SCR. This SCR was proposed when it was determined that NPRR626 did not include all applicable RTL determinants.