(1) Except as otherwise provided in subsection (5)(c), rates charged in each territory by the pool for home insurance shall be actuarially determined and calculated to generate a total premium sufficient to cover the expected losses and expenses that the pool will likely incur during the projected period for which the rates will be effective, subject to the following:

  (a) If the pool’s actuarially indicated overall rate change is greater than 5% but less than or equal to 20%, the pool shall take 1/2 of the actuarially indicated rate change amount.

  (b) If the pool’s actuarially indicated overall rate change is greater than 20%, the pool shall take the full amount that exceeds 20%, plus 10%.

  (c) If the pool’s actuarially indicated overall rate change is less than 5%, the pool shall take the entire indicated rate change amount.

  (2) Rates developed under this section are subject to the following:

  (a) The rates shall not be revised more than annually.

  (b) The rates shall be filed with the commissioner for prior approval. A filing is considered to be approved unless it is disapproved by the commissioner within 30 days after it is received.

  (c) If the commissioner disapproves a filing within 30 days after it is received, he or she shall send written notice of disapproval to the pool specifying in what respects the filing fails to meet the requirements of this act and stating that the filing shall not become effective.

  (d) If at any time after the 30-day period specified in subdivision (b) the commissioner finds that a filing does not meet the requirements of this act, the commissioner shall, after a hearing held on not less than 10 days’ written notice specifying the matters to be considered at the hearing, issue an order specifying in what respects the commissioner finds that the filing fails to meet the requirements of this act and stating when, within a reasonable period after the date of the order, the filing shall be considered no longer effective.

  (3) In addition to the requirements of subsections (1) and (2), the premium established for the repair cost policy offered by the pool shall not exceed the premium for an amount of insurance equal to 80% of the replacement cost of the property under the replacement cost policy of the pool equivalent to the HO-2 form replacement cost policy filed and in effect in this state for a licensed rating organization. Premiums for dwellings with identical replacement costs shall vary on a schedule determined by the pool in accordance with the insured value of the dwelling.

  (4) The pool or any other association or organization designated by the pool shall develop its own actuarially justified statistical plans, rating rules, classifications, territories, and rating calculation steps for home insurance issued on behalf of the pool consistent with this section.

  (5) The pool shall offer at least the following home insurance policy forms:

  (a) An HO-2 form replacement cost policy equivalent to the HO-2 form replacement cost policy filed and in effect in this state for a licensed rating organization.

  (b) A repair cost policy providing the deductibles, terms and conditions, perils insured against, and types and amounts of coverage equivalent to those provided by the HO-2 replacement cost policy filed and in effect for a licensed rating organization.

  (c) An HO-3 form replacement cost policy equivalent to the HO-3 form replacement cost policy filed and in effect in this state for a licensed rating organization. The rates established by the pool for the HO-3 form replacement cost policy offered pursuant to this subdivision shall be actuarially determined and calculated to generate a total premium sufficient to cover the expected losses and expenses of the pool related to the HO-3 replacement cost policy that the pool will likely incur during the projected period for which the rates will be effective. The premium shall be adjusted fully in a single period or over several periods in a manner provided for in the plan of operation for any excess or deficient premiums from previous periods. Rates established by the pool under this subdivision shall not be based upon the methodology provided for in subsection (1).

  (6) Policy forms shall be filed with the commissioner for prior approval.

  (7) As used in this section:

  (a) “Actuarially indicated overall rate change” means rate change calculated within the framework and principles of the casualty actuarial society that uses a permissible combined ratio of 100%.

  (b) “Combined ratio” means the sum of the loss ratio and the expense ratio where the loss ratio is the ratio of incurred loss and loss adjustment expenses to earned premium and the expense ratio is the ratio of underwriting expenses to earned premium.