CREDIT AGREEMENT among PUBLIC SERVICE COMPANY OF COLORADO, as Borrower, The Several Lenders from Time to Time Parties Hereto, BMO CAPITAL MARKETS, THE BANK OF TOKYO-MITSUBISHI, LTD., CHICAGO BRANCH, and KEYBANK NATIONAL ASSOCIATION as Documentation...Credit Agreement • December 20th, 2006 • Xcel Energy Inc • Electric & other services combined • New York
