Denver Post, Date of Notice: June 17, 2013 NOTICE OF REVISION IN THE ELECTRIC COMMODITY ADJUSTMENT ON LESS THAN THIRTY-DAYS' NOTICE OF PUBLIC SERVICE COMPANY OF COLORADO 1800 LARIMER STREET, DENVER, COLORADO 80202-5533 You are hereby notified that Public Service Company of Colorado (“Public Service” or “Company”) has filed with The Public Utilities Commission (“Commission”) of the State of Colorado, in compliance with the Public Utilities Law, an application for permission to decrease its Electric Commodity Adjustment (“ECA”) on less than thirty-days’ notice to become effective July 1, 2013, if said application is granted by the Public Utilities Commission. The purpose of the revision in the ECA is to reflect updated forecasted fuel and purchase energy costs for the period July 1, 2013 through September 30, 2013 and to reflect the ECA deferred balance as of May 31, 2013, which was $4,010,211.82 under-collected. A summary of the proposed revision to the ECA rates, by type of service, is provided below, and is applicable to all areas served by Public Service throughout the State of Colorado. Secondary Voltage is applicable to all services at secondary voltage including: R, (including customers taking service under the Company’s Medical Exemption Program (“MEP”) rate offered to qualifying customers from June 1, 2013 September 30, 2013), RD, RAL, RTOU, RPTR, RCPP, C, NMTR, SG, SGL, SST, STOU, SPVTOU, CAL, PLL, MSL, ESL, MI, SL, SSL, COL, SLU, and TSL. Primary Voltage is applicable to all services at primary voltage including: PG, PST, PTOU and SCS-7. Transmission Voltage is applicable to all service transmission voltage including TG, TST and TTOU. Present and Proposed Electric Commodity Adjustment Factors Present Electric Proposed Electric T ype of Service Commodity Adjustment Commodity Adjustment Residential$0.03293/kWh$0.03171/kWh Small Commercial$0.03293/kWh$0.03171/kWh Commercial & Industrial Secondary$0.03293/kWh$0.03171/kWh Commercial & Industrial Primary Time-of-Use Off-Peak$0.02744/kWh$0.02643/kWh Time-of-Use On-Peak$0.03952/kWh$0.03806/kWh Commercial & Industrial Transmission Time-of-Use Off-Peak$0.02710/kWh$0.02609/kWh Time-of-Use On-Peak$0.03902/kWh$0.03758/kWh The following table shows the current and proposed total monthly impact for the major rate schedules. Current and Proposed Total Monthly Impact Rate Schedule Monthly Monthly Monthly Monthly Percentage Average Existing Proposed Difference Difference Usage Bill Bill Schedule R 632 kWh $75.67 $74.89 ($0.78) -1.03 % Schedule C 1,123 kWh $145.14 $143.74 ($1.40) -0.96 % Schedule SG 26,685 kWh $2,612.96 $2,579.75 ($33.21) -1.27 % Schedule PG 492,079 kWh$39,051.64$38,457.62 ($594.02) -1.52 % Schedule TG12,889,873 kWh $835,426.75 $820,125.92 ($15,300.83) -1.83 % The Company projects that the revised ECA Factors will result in a decrease in Company revenues for the period July September 2013 of $9,375,547. In accordance with Rule 1206 (f) of the Rules of Practice and Procedure of the Public Utilities Commission, copies of the proposed and present ECA Factors summarized above have been filed with the Commission and are available for examination and explanation at the main office of Public Service Company of Colorado, 1800 Larimer Street, Suite 1400, Denver, Colorado 80202-5533, or at the office of the Public Utilities Commission, 1560 Broadway, Suite 250, Denver, Colorado, 80202. Anyone who desires to file written objection to the proposed action, shall file it with the Colorado Public Utilities Commission, 1560 Broadway, Suite 250, Denver, Colorado, 80202, or email it to dora_puc_complaints@state.co.us on or before June 24, 2013. The Public Utilities Commission may hold a hearing to determine what rates, rules and regulations will be authorized. If a hearing is held, the Commission may suspend the proposed rates, rules or regulations. The rates, rules and regulations ultimately authorized may or may not be the same as those proposed and may include rates higher or lower than those proposed or currently in effect. Anyone who desires to receive notice of any hearing shall file a written request for notice with the Public Utilities Commission at the above address or alternatively shall contact the External Affairs Section of the Public Utilities Commission at 303-894-2070 or toll free 1-800-456-0858 on or before June 24, 2013. Customers who have questions may call the Commission at 303-894 2000, Xcel Energy at 1-800-895-4999, fax to Xcel Energy at 1-800-895-2895, or e mail to inquire@xcelenergy.com . If a hearing is held, any member of the public may attend and may make a statement under oath about the proposed decrease, whether or not he or she has filed an objection or intervention. By:Scott B. Brockett Director, Regulatory Administration and Compliance