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BROOKINGS-TWIN CITIES DEVELOPMENT PROJECT AGREEMENT ATTACHMENT 1 DESCRIPTION OF TRANSMISSION PROJECT AND ADDITIONAL DEFINITIONS Description - BrookinQS. S.D. -Southeast Twin Cities 345 ki~Line The proposed Transmission Project consists of: 1) an approximately 200-mile, 345 kV transmission line between Brookings, S.D., and the southeast Twin Cities; and 2) a related approximately 30-mile, 345 kV transmission line between Marshall, Minn., and Granite Falls, Minn. The first step in the regulatory process for the Project is to establish a notice plan to provide potentially interested people the opportunity to participate in the certificate of need proceeding. This is presently being done by Great River Energy, the Development Project Manager. The Brookings, S.D., to southeast Twin Cities proposal is a 345 kV transmission line between the Brookings County Substation near Brookings, S.D., and a new substation in the southeastern quadrant of the Twin Cities area, plus a 345 kV transmission line between Marshall and the Granite Falls area. Alternatively, a portion of the proposal could follow an existing 230 kV line corridor between Granite Falls and near New Prague, Minn. Parts of the new transmission infrastructure may be located in the following Minnesota counties: Brown, Carver, Chippewa, Dakota, LeSueur, Lincoln, Lyon, McLeod, Redwood, Renville, Rice, Scott, Sibley and Yellow Medicine. The proposal also includes the following connections to the existing transmission system: • Brookings County Substation near Brookings, S.D. • Lyon County Substation near Marshall, Minn. • Anew substation (Hazel Run) near Granite Falls, Minn. • A 230 kV line from Hazel Run to Minnesota Valley Substation on the east side of Granite Falls. • Franklin Substation or a new substation in the Franklin area. • Anew substation (Union Hill), west of New Prague, to connect with the existing Twin Cities to Mankato 345 kV line. • Lake Marion Substation or a new substation further south in the Interstate 35 corridor to connect to an existing 115 kV line. • Anew substation (Hampton Corner) to connect the line to an existing 345 kV line northeast of Hampton, Minnesota. At this early stage in the regulatory process, detailed analysis of routing alternatives for the proposed Brookings, S.D. to southeast Twin Cities transmission lines and sites for the C:\Documents and Settings\Bryan\Local Settings\Temporary Internet Files\OLK53\Cap X Brookings 2-12-07 29 clean.doc