EXHIBIT 4.1 PUBLIC SERVICE COMPANY OF COLORADO 4.875 % First Collateral Trust Bonds, Series No. 11 due 2013 REGISTRATION RIGHTS AGREEMENTRegistration Rights Agreement • June 11th, 2003 • Public Service Co of Colorado • Electric & other services combined • New York
FORM OF EXCHANGE AGENCY AGREEMENTExchange Agency Agreement • June 11th, 2003 • Public Service Co of Colorado • Electric & other services combined • Colorado
