Orono_Route_Permit_Application - Docket # W002/TL-11-223

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Route. Additionally, Alternative Route 4 requires crossing the BNSF railroad, the Metropolitan Council sewer line and U.S. Highway 12 unlike the Proposed Route. 4.4 Associated Facilities and Substation Modifications The associated facilities for the Project include a replacement of the existing 69 kV Orono Substation with a larger 115 kV substation, where the proposed new 115 kV transmission line will begin on the southeast end of the Project, reconfiguring Line 0831 and replacement of transmission Structures 076, 077 and 078. No additional fee land purchase is anticipated for the replacement of the existing Orono Substation. 4.4.1 Orono Substation (Replacement) The existing Orono Substation is located at 3960 6th Avenue North, Orono, Hennepin County, Minnesota, on a 16 -acre site owned by Xcel Energy, approximately 900 feet west of the intersection of U.S. Highway 12 and County Road 6. It is approximately one mile east of the City of Maple Plain municipal boundaries (see Figure B-3 in Appendix B). The existing Orono Substation is a 69-13.8 kV distribution substation that will be partially demolished and replaced with a new 115-13.8 kV distribution substation (see Appendix B, Figure B-10). All of the substation replacement will be located within existing Xcel Energy property at the 16 -acre site and will encompass the site of the existing 69 kV substation. The existing switchgear will be reused in the proposed new substation. The existing substation will remain energized until the existing switchgear enclosure in its current location can be energized from the new 115 kV source. During construction a feeder field ties with ORO62 and a mobile substation with associated equipment will be installed to ensure continuity of service for the 17 MVA load before the switchgear enclosure is switched to the new 115 kV source. On the transmission portion of the Orono Substation project, the proposed replacement consists of: • a new 115-13.8 kV substation with a 28 mega volt ampere ("MVA"), 118-14.3 kV transformer; • two 115 kV line terminations, each with a motor -operated transmission line switch with a quick -break line dropping whip; • one single-phase coupling capacitors voltage transformers ("CCTVs") with carrier accessories; • a 2000 amp ("A") wave trap with line tuner; and • three 76 kV maximum continuous operating voltage ("MCOV") station class surge arresters. The transmission portion of the replacement work also includes all bus (all 115 kV bus will be sized for a minimum 2000A capacity), cable, controls and relaying, steel, trenching, applicable setbacks, stormwater ponds, grading, foundations, fencing, new and existing rights-of-way for the transmission line and transmission line termination structures. Xcel Energy will coordinate with GRE to modify the 115 kV remote end relay settings at both Crow Rivers (CRO GRE) and Medina Orono Project June 7, 2011 MPUC Docket No. E002/TL-11-223 18