Capitol Water Corporation Purchased Power Adjustment Order

Office of the Secretary Service Date March 24, 2026

BEFORE THE IDAHO PUBLIC UTILITIES COMMISSION

IN THE MATTER OF CAPITOL WATER ) CASE NO. CAP-W-25-03 CORPORATION’S APPLICATION TO ) ORDER NO. 36982 CHANGE ITS SCHEDULE NO. 3 — ) PURCHASED POWER ADJUSTMENT ) )

On October 23, 2025, Capitol Water Corporation (“Company”) applied to the Idaho Public Utilities Commission (“Commission”) for authority to change the Company’s Schedule No. 3 - Purchased Power Cost Adjustment (“Schedule No. 3” or “PPCA”) rate to recover the electricity costs that exceeded what it collected in rates. The Company requested a new PPCA rate of 4.61%, with the final rate to be determined at the conclusion of Case No. CAP-W-25-02, effective on or after January 1, 2026. On December 23, 2025, the Commission issued Order No. 36884 approving the new PPCA rate of 4.61%. The Commission ordered the Company to update the PPCA rate within thirty (30) days of the conclusion of Case No. CAP-W-25-02 using the base rate revenue approved in that case. Order No. 36884 at 5. On March 3, 2026, the Company filed an updated Schedule No. 3, reflecting an updated PPCA rate of 4.41% with an effective date of February 26, 2026, based on the authorized base rate revenue approved in Case No. CAP-W-25-02. The proposed February 26, 2026, effective date is consistent with the service date of Final Order No. 36948 that approved the base rate revenue in Case No. CAP-W-25-02.

COMMISSION FINDINGS AND DECISION

The Commission has jurisdiction over this matter under Idaho Code §§ 61-501, 61-502, and 61-503. The Commission is vested with the power to “supervise and regulate every public utility in the state and to do all things necessary to carry out the spirit and intent of the [Public Utilities Law].” Idaho Code § 61-501. The Commission is empowered to investigate rates, charges, rules, regulations, practices, and contracts of public utilities and to determine whether they are just, reasonable, preferential, discriminatory, or in violation of any provision of law, and to fix the same by order. Idaho Code §§ 61-502 and 61-503. Having reviewed the record and all submitted filings, the Commission finds that the Company’s March 3, 2026, compliance filing comports with the Commission’s directives in Order No. 36884.

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ORDER

IT IS HEREBY ORDERED that the Company’s March 3, 2026, compliance filing is approved with a 4.41% PPCA rate, effective as of February 26, 2026. THIS IS A FINAL ORDER. Any person interested in this Order may petition for reconsideration within twenty-one (21) days of the service date upon this Order regarding any matter decided in this Order. Within seven (7) days after any person has petitioned for reconsideration, any other person may cross-petition for reconsideration. Idaho Code § 61-626. DONE by Order of the Idaho Public Utilities Commission at Boise, Idaho this 24 day of th March 2026. __________________________________________ EDWARD LODGE, PRESIDENT __________________________________________ JOHN R. HAMMOND JR., COMMISSIONER __________________________________________ DAYN HARDIE, COMMISSIONER ATTEST: Monica Barrios-Sanchez Commission Secretary

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