NPRR999  DC Tie Ramp Limitations

This Nodal Protocol Revision Request (NPRR) revises Protocol Section 4.4.4 and creates new Protocol Section 4.4.4.3 to clarify that, in those cases where ERCOT determines that system conditions show insufficient ramp capability to meet the sum of all Direct Current Ties’ (DC Ties’) scheduled ramp, ERCOT may either (1) curtail DC Tie schedules or (2) require DC Tie Operators to resubmit e-Tags with an adjusted ramp duration. This NPRR is proposed in accordance with the May 23, 2017, order of the Public Utility Commission of Texas (PUCT) in Project No. 46304, Oversight Proceeding Regarding ERCOT Matters Arising Out of PUC Docket No. 45624 Relating to DC Tie Project Proposed by Southern Cross Transmission, LLC, which requires ERCOT to address a number of issues as a condition for the energization of the DC Tie project proposed by Southern Cross Transmission LLC (“Southern Cross”). Relevant here, Directive 3 in the order requires ERCOT to “determine what ramp rate restrictions, if any, will be necessary to accommodate the interconnection of the Southern Cross DC Tie.”