Assessment of ATC for Short-Term Firm and Non-Firm Transmission Service Sample Clauses

Assessment of ATC for Short-Term Firm and Non-Firm Transmission Service. A. Short Term Analysis These studies will be made using a flow-based approach to determine the capability of the interconnected network to accommodate the request for transmission service. A flow-based approach determines ATC of constrained facilities. Constrained facility ATC represents capacity remaining on constrained facilities after reduction for base flows, previously approved transmission service requests and a margin (if appropriate). Requests for transmission service are made on a point-to-point basis from source(s) to sink(s). However, ATC has been determined on a constrained facility basis. In order to evaluate a transmission service request, response factors are used to decrement ATC of constrained facilities. If ATC of all constrained facilities is positive after decrementing, the interconnected network has capability to accommodate the request. The Transmission Provider has developed an automated process to determine ATC and to respond to short-term Transmission Service requests. This process is called OASIS Automation. OASIS Automation automatically processes requests for Transmission Service using a flow-based approach to determine ATC on constrained facilities. OASIS Automation is integrated with the Transmission Provider’s energy management system and uses power flow models developed from the real-time system. OASIS Automation computes constrained facility hourly available flowgate capability (“AFC”) for the first 7 days and daily AFC for days 8 through 31. Off-line planning models are used to compute constrained facility monthly AFC for months 2 through 36. The Transmission Provider performs studies to determine AFC during three different time periods. The first time period is the operating horizon, which includes those hours when the Transmission Provider has schedules to indicate the scheduled use of transmission reservations. The operating horizon includes all hours of the current day and, after 3:00 p.m., all hours of the next day. Once an hour, an hourly resynchronization occurs for the operating horizon. Resynchronization is the process of building power flow models that will be used to determine AFC for each of the constrained facilities and to determine response factors a transaction has on constrained facilities. Only response factors above a threshold are considered to have a significant impact on constrained facilities. This means hourly AFCs are determined for each hour of the remaining hours in the current day and, after 3:0...
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