XCEL ENERGY INC

Definitions of Abbreviations Xcel Energy Inc.’s Subsidiaries and Affiliates (current and former) Capital Services Capital Services, LLC Eloigne Eloigne Company e prime e prime inc. Nicollet Project Holdings Nicollet Project Holdings, LLC NSP-Minnesota Northern States Power Company, a Minnesota corporation NSP System The electric production and transmission system of NSP-Minnesota and NSP-Wisconsin operated on an integrated basis and managed by NSP-Minnesota NSP-Wisconsin Northern States Power Company, a Wisconsin corporation PSCo Public Service Company of Colorado SPS Southwestern Public Service Co. Utility subsidiaries NSP-Minnesota, NSP-Wisconsin, PSCo and SPS WGI WestGas InterState, Inc. WYCO WYCO Development, LLC Xcel Energy Xcel Energy Inc.