Chapter 4.3 Transmission Service Requests
Transmission Service Request (TSR) acquisition is the first step in creating schedules to move energy in, out, through or within the MISO Market footprint or to make bilateral contracts to receive or supply energy within the MISO Market footprint. When a customer or Market Participant submits and confirms a TSR on the MISO Open Access Same-Time Information Service (OASIS), it reserves transmission capacity. Long-term TSRs (one year or longer) must be evaluated for impacts on system reliability by the MISO Transmission Service Planning Group. Short-term TSRs (less than one year) are evaluated by MISO Tariff Administration.
From June 2014 to June 2015, MISO Transmission Service Planning processed 209 long-term TSRs (Figure 4.3-1) and completed 17 System Impact Studies. Of these System Impact Studies, five were confirmed, one was refused, one executed a Facilities Study Agreement and one awaits the completion of a corresponding external System Impact Studies.
Long-term TSRs processed and evaluated by MISO planning staff are either Firm Point-to-Point or Network. Point-to-Point Transmission Service is the reservation and transmission of capacity and energy from the Point(s) of Receipt to the Point(s) of Delivery while Network Transmission Service allows a network customer to efficiently and economically utilize its Network Resources, as well as other non-designated generation resources, to serve its Network Load located in the Transmission Owner’s Local Balancing Authority area or pricing zone.
Short-term TSRs evaluated by Tariff Administration have a term of less than one year and can be firm or non-firm. Tariff Administration looks at the available flowgate capacity (AFC) on the 15 most-limiting constrained facilities on a TSR path to verify adequate capacity. If the AFC is positive for all 15 constrained facilities, the request is likely to be approved. Negative AFC on one or more of the 15 constrained facilities results in either a counter-offer or denial.
New long-term TSRs are processed based on queue order and type in the Triage phase (Figure 4.3-2). A TSR can be one of the three following types: original, a new TSR; renewal, a continuation of an existing TSR; or redirect, the changing of the source and/or sink of an existing TSR.
If a System Impact Study (SIS) is needed and the transmission customer returns the executed study agreement and deposit, MISO must complete the study within 60 calendar days from the time the agreement and deposit are received. MISO can accept the TSR and request specification sheets from the transmission customer if no constraints are identified in the study or if partial capacity can be granted. A Facilities Study is required if constraints are identified in the SIS.
MISO then sends out a Facility Study Agreement within 30 calendar days for the customer to return along with a study deposit if they would like to move forward. If the agreement and deposit are not received, the TSR is refused. The Facility Study provides the costs and schedules to build upgrades required to mitigate the constraints identified in the SIS. Once complete, the customer has the option to take a reduced amount of transmission service, as identified in the SIS, proceed with a Facility Construction Agreement (FCA), or withdraw the TSR.
If the customer signs the FCA, the identified upgrades are included in MTEP Appendix A as Transmission Delivery Service Projects (TDSP). The cost of these upgrades is either directly assigned or rolled-in as per Attachment N of the Tariff. MISO can then request specification sheets and conditionally accept the TSR until all upgrades are in-service.
Transmission Service Restriction
On March 28, 2014, the Federal Energy Regulatory Commission (FERC) accepted, over MISO’s objection, a Transmission Service Agreement filed by Arkansas-based Southwest Power Pool (SPP), requiring MISO to pay SPP for any flow on SPP’s transmission system above the existing 1,000 MW contract path between MISO North and MISO South. MISO has put a hold on evaluating any further TSRs from MISO South to MISO North (or contiguous region) or vice versa. The hold is pending the outcome of the dispute resolution between MISO, SPP and other parties in various dockets. MISO is also carefully considering how to implement processes that respect the contract path limit consistent with MISO’s flow-based methodology for evaluating TSRs.
Meanwhile, MISO is delaying the processing of Long-Term Firm TSRs involving generation flows between MISO South and MISO North. Specifically, MISO is using the following process:
- All currently confirmed TSRs will be honored by MISO (subject to limitations that may be imposed by other transmission service providers in the TSR path)
- For TSRs that have been accepted by MISO, but not confirmed by the requestor, the requestor will be given the option to withdraw the TSR or confirm the TSR subject to redirection
- Pending or queued TSRs will remain in study mode until MISO’s dispute with SPP regarding the SPP Agreement, and the MISO-SPP Joint Operating Agreement, is settled or resolved, or an appropriate solution is developed
On May 22, 2014, in FERC Docket No. ER14-2022-000, MISO filed a Tariff waiver request to allow implementation of the above-described interim process for TSRs. The waiver was accepted by FERC on December 14, 2014.
On March 31, 2015, in FERC Docket No. ER 14-2022-001, MISO filed for a year-long extension of the previously approved waiver.