PSC 134.061(3)(b)(b) Upon termination of a guarantee contract, or whenever the utility deems the guarantee insufficient as to amount of surety, a cash deposit or a new or additional guarantee may be required upon 20-day written notice to the customer. The service of any customer who fails to comply with these requirements may be disconnected upon 8 days’ written notice. PSC 134.061(3)(c)(c) The utility shall mail the guarantor copies of all disconnect notices sent to the customer whose account has been guaranteed, unless the guarantor waives such notice in writing. PSC 134.061(4)(a)(a) A utility may require a cash deposit or other guarantee as a condition of residential service if any of the following circumstances apply: PSC 134.061(4)(a)1.1. The utility has disconnected the customer’s service within the last 12-month period for violation of the utility’s filed rules or for nonpayment of a delinquent service account not currently in dispute. PSC 134.061(4)(a)2.2. Subsequent credit information indicates that the initial application for service was falsified. PSC 134.061(4)(a)3.3. The customer had the ability to pay for the utility service but, during the cold weather disconnection rules period, had an arrears amount incurred during that period, that was 80 days or more past due. The utility may request a deposit under this section even if the customer’s service has not been disconnected. PSC 134.061(4)(b)(b) A deposit under this section shall not be required if the customer provides the utility with information showing that his or her gross quarterly income is at or below 200% of the federal income poverty guidelines. PSC 134.061(4)(c)(c) When the utility requests a deposit of an existing residential customer, the customer shall be informed of his or her right to provide the deposit, guarantee, or to establish a deferred payment agreement. The customer shall be given 30 days to provide the deposit, guarantee, or enter into a deferred payment agreement for payment of the deposit amount. PSC 134.061(5)(5) Written explanation. A utility shall provide a written explanation of why a deposit or guarantee is being required for a residential account. The explanation shall include notice of the customer’s right to appeal any deposit request or amount required under this section to the public service commission. PSC 134.061(6)(6) Reasonableness of deposit. When requesting a deposit from a residential customer, the utility shall consider the customer’s ability to pay, including the following factors, in determining the reasonableness of its request: PSC 134.061(6)(e)(e) Any other relevant factors concerning the circumstances of the customer, as household size, income and expenses. PSC 134.061(7)(a)(a) The maximum deposit for a new residential account shall not exceed the highest estimated gross bills for any 2 consecutive billing periods selected by the utility. PSC 134.061(7)(b)(b) Except as provided in par. (c), the maximum deposit for an existing residential account shall not exceed the highest actual gross bills for any 2 consecutive months within the preceding 12 month review period, as determined by the utility. PSC 134.061(7)(c)(c) If, during the cold weather disconnection rules period, a customer had an arrears amount incurred during this period that was 80 days or more past due and had the ability to pay for utility service, the deposit may not exceed the highest actual gross bills for any 4 consecutive months within the preceding 12 month review period, as determined by the utility. PSC 134.061(8)(8) Refusal or disconnection of service. Residential service may be refused or disconnected for failure to pay a deposit request subject to the rules pertaining to disconnection and refusal of service, as provided in s. PSC 134.062. PSC 134.061(9)(a)(a) Deposits for residential accounts shall bear interest payable from the date a deposit is made to the date it is applied to an account balance or is refunded. PSC 134.061(9)(b)(b) The interest rate to be paid shall be subject to change annually on a calendar year basis. The commission shall determine the rate of interest to be paid on deposits held during the following calendar year and notify utilities of that rate by December 15 of each year. The rate shall be equal to the weekly average yield of one-year United States treasury securities adjusted for constant maturity for the week ending on or after December 1 made available by the federal reserve board, rounded to the nearest tenth of one per cent. PSC 134.061(9)(c)(c) The rate of interest set by the commission shall be payable on all deposits. Utilities shall calculate the interest earned on each deposit at the time of refund and at the end of each calendar year. The interest rate in a calendar year shall apply to the amount of the deposit and to all interest accrued during the previous year(s), for the fraction of the calendar year that the deposit was held by the utility. PSC 134.061(10)(10) Refund. The utility shall refund the deposit of a residential customer after 12 consecutive months of prompt payment. PSC 134.061(11)(11) Review. The utility shall not continue to require a cash deposit for a residential account unless a deposit is permitted under the provisions of sub. (4) or (10). PSC 134.061(12)(12) Method of refund. Any deposit or portion thereof refunded to a residential customer shall be refunded by check unless both the customer and the utility agree to a credit on the regular billing, or unless sub. (14) applies. PSC 134.061(13)(13) Refund at termination of service. On termination of residential service, the utility shall credit the deposit, with accrued interest, to the customer’s final bill and return the balance within 30 days of issuing the final bill.