NOTICE OF FILING AMENDED TARIFF FOR ENERGY COST ADJUSTMENT (ECA) IN COLORADO P.U.C. NO. 11 ELECTRIC TARIFF of Black Hills Colorado Electric, LLC d/b/a Black Hills Energy       You are hereby notified that Black Hills Colorado Electric, LLC, d/b/a Black Hills Energy, 105 South Victoria Avenue, P.O. Box 75, Pueblo, Colorado, 81003-0075, has filed with the Public Utilities Commission of the State of Colorado (“Commission”), in accordance with the Public Utilities Law, Advice Letter No. 894 with a revised tariff to amend the Energy Cost Adjustment (“ECA”) on Tariff Sheet No. 65 in the Rates section of its Colo. P.U.C. No. 11- Electric Tariff, to become effective on October 1, 2025. The revised tariff will affect all retail customers if the Commission allows the tariff to become effective.   The ECA rate is updated quarterly (January, April, July, October) and is applicable to all retail customers. The ECA is a mechanism to recover costs incurred by the Company for natural gas used in the production of electricity, costs associated with renewable energy production, and/ or costs for wholesale power purchased by the Company to meet customers’ energy needs. These costs incurred by the Company are strictly pass-through costs.   The components included in the ECA filing reflect the expected cost of energy for the period October 1, 2025, through September 30, 2026. This ECA update also includes a true-up to actual costs during the period of May 1, 2025, through July 31, 2025.   If permitted to go into effect on October 1, 2025, the tariff proposed herein will result in increased annualized revenues of approximately $0.4M for the Company.   The proposed revision, if approved, will increase the current ECA rate for secondary voltage customers from $.04867 per kWh to $.04928 per kWh.   The tariff revision will increase the average residential customer bill by $0.39 from $124.54 to $124.93, or 0.31%.   The tariff revision will increase the average small commercial customer bill by $1.49 from $417.14 to $418.63 or 0.36%.   Large commercial and industrial customers may call Black Hills Energy at telephone (719) 546-5847 to obtain information concerning how the requested new tariff may affect them.   Customers who are having difficulty paying their energy bills can contact Black Hills Energy for information on resources that may offer bill assistance. Bill assistance information can be found at https://www.blackhillsenergy.com/assistance-programs/colorado-paymentassistance.   Copies of the proposed and present tariffs as filed with the Public Utilities Commission of the State of Colorado are available for inspection at the public offices of Black Hills Energy at 105 South Victoria Avenue, Pueblo, Colorado, 81003; or, at the office of the Public Utilities Commission, 1560 Broadway, Suite 250, Denver, Colorado 80202. Customers with questions concerning the proposed or present tariffs may call the Commission at (303) 894-2000; or may contact Black Hills Energy by telephone at (888) 890-5554 or by email customerservice@support.blackhillsenergy.com. In addition, the Company’s proposed and present tariffs may be viewed at www.blackhillsenergy.com and the applicable Colorado statutes and Commission rules may be viewed at https://puc.colorado.gov.   Any person may file written comments or objections concerning the filing, with the Colorado Public Utilities Commission, 1560 Broadway, Suite 250, Denver, Colorado, 80202, at the following website: https://puc.colorado.gov/puccomments. Requests for written notices can also be made to the Commission by telephone at (303) 894-2000 or, alternatively, by contacting the Consumer Affairs section of the Commission at its local number (303) 894-2070 or toll-free number (800) 456-0858. The Commission will consider all written comments and objections submitted prior to the evidentiary hearing on the application. Written objections (protests) must be filed at least ten (10) days before the proposed effective date of October 1, 2025. Filing a written objection (protest) by itself will not allow you to participate as a party in any proceeding established in these matters. If you wish to participate as a party in this matter, you must file written intervention documents under Commission Rule 723-1-1401, 4 Colorado Code of Regulations 723-1.   The rates, rules, and regulations ultimately authorized by the Commission may or may not be the same as those proposed and may include rates higher or lower than those proposed or currently in effect.   The Commission may suspend the proposed tariffs, rates, rules, or regulations. The Commission may hold a hearing to determine which rates, rules, and regulations will be authorized. If a hearing is held, any member of the public may attend the hearing and may make a statement under oath about the proposed tariffs, whether he or she has filed an objection or intervention. If the filing is uncontested or unopposed, the Commission may determine the matter without a hearing and without further notice.     By: Jennifer Bass Manager, Regulatory