Public Service Company of Colorado ("Public Service" or the "Company"), an operating
company subsidiary of Xcel Energy Inc., is issuing this Request for Proposals ("RFP") in
response to its November 19, 2010 Amendment to the Company's 2007 Colorado
Resource Plan. Through this RFP the Company seeks proposals for up to approximately
200 MW of wind generation projects to be placed in service no later than December 31,
2012. Proposals are due on January 17, 2011 by 4:00 MDT. The Company will not be
bidding any wind projects into this RFP.