Xcel Energy Projects From 2008 Reliability Assessment

Douglas Co 2 nd Transformer: Low voltages in the region for the loss of Douglas Co transformer. Install a 2 nd Douglas Co 115/ 69 kV transformer. Planned inservice date is ~ 2011

Monticello Transformer Upgrade: Loss of Sherco – Benton 345 kV line overloads Monticello 345/230 kV transformer. Upgrade the existing transformer to 550 MVA. Inservice date ~ 2011.

Sioux Falls Area Upgrades Add second 112 MVA transformer at Lawrence ISD – 12/1/2012 Split dbl ckt 115 kV line from Split Rock- Cherry Creek/West Sioux Falls ISD – 6/1/2011 Solves low voltages and transformer overloads

South Minneapolis Electric Reliability Project (SMERP) New HWY / 115kV sub kV line New Hiawatha sub 2010 and Midtown sub 2010 Open Elliot Park-Hiawatha line New Crosstown sub 2014 Dbl ckt 115 kV line 2014 To Lexington 115 kV line Parkers Lake Eden Prairie Red Rock 2013

Cannon Falls Area Upgrades Loss of either Cannon Falls transformer overloads the other transformer. Add a 115/69kV 112MVA transformer at Colville substation. Reroute Cannon Falls- Byllesby 69kV line to Colville-Byllesby. Replace bus tie breaker with a breaker ring bus at Cannon Falls. ISD – 6/1/2012