Xcel Energy

Projects From

2008 Reliability Assessment

Douglas Co 2nd Transformer:

• Low voltages in the region for the loss of Douglas Co transformer.

• Install a 2nd 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 280 345/ 115kV sub

2013

345 kV line 2013-2020

New Hiawatha sub 2010 andMidtown sub

2010

Open Elliot Park-Hiawatha line 2013-2020

New Crosstown sub 2014

Dbl ckt 115 kV line 2014

To Lexington

115 kV line 2013

2-672 MVA @ Parkers Lake

2015

2-672 MVA @ Eden Prairie

2014

2-672 MVA @ 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