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Hooper Springs
BPA is proposing to build a new 115-kilovolt (kV) transmission line and a new 138/115-kV substation, called Hooper Springs Substation in Caribou County, Idaho. The new transmission line and substation are needed to improve voltage stability on the transmission grid and to meet future load growth. Two routing alternatives are being considered for the proposed line from the Hooper Springs Substation to the connection with LVE's transmission system: a North Alternative, including two route options and a South Alternative, including five route options. BPA is also considering a no action alternative, that is, BPA would not build the transmission line. BPA released a draft environmental impact statement (EIS) in March 2013, for public review and comment through April 22, 2013.
BPA proposes to build a new 115-kilovolt (kV) transmission line that would extend from BPA's proposed Hooper Springs Substation near the city of Soda Springs, Idaho, to either an existing Lower Valley Energy (LVE) substation or a proposed BPA connection facility that would connect with LVE's existing transmission system in northeastern Caribou County. The project is needed to improve voltage stability on the transmission grid to meet future load growth in southeast Idaho and northwestern Wyoming. The new line would be 22 to 33 miles depending on the route alternative or option. BPA also would construct an approximately 0.2-mile-long 138-kV transmission line between the proposed Hooper Springs Substation and PacifiCorp's existing Threemile Knoll Substation to connect the electrical facilities to the regional transmission grid.
 
Two route alternatives are being considered for the proposed line from the Hooper Springs Substation to the connection with LVE's transmission system: a North Alternative, including two route options and a South Alternative, including five route options. BPA is also considering a No Action Alternative, that is, BPA would not build the transmission line. BPA has identified the South Alternative's Option 3A as the preferred alternative. BPA accepted public comments on a draft environmental impact statement (EIS) in spring 2013. BPA also accepted comments on a supplemental draft EIS through Aug. 7, 2014.
 
Schedule
You may see BPA staff and contractors working in the area as we continue to evaluate and refine project alternatives and options in the coming months. BPA will use the updated information gathered to help respond to the comments it has received and to prepare the final EIS. BPA will respond to comments submitted on the supplemental draft EIS in the final EIS, expected winter 2014/2015. We then expect to issue a record of decision in early 2015 that will explain BPA's decision about whether to build the project and, if so, the alternative selected.
 
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