(1) Telecommunications companies not classified as competitive. Telecommunications companies not classified as competitive may file banded rate tariffs. The filings must, at a minimum, be accompanied with the following:

(a) A statement supporting the use of a banded rate tariff rather than a tariff with fixed rates;

(b) A verifiable cost-of-service study supporting the contention that the minimum rate in the banded rate tariff covers the cost of the service. Costs will be determined under a long-run incremental cost analysis, including, as part of the incremental cost, the price charged to other telecommunications companies for any essential function used to provide the service, or any other commission-approved cost method; and

(c) Information detailing the potential effect on revenue of the proposed banded rate tariff range, as well as the effect on revenue of the current or proposed rate.

(2) Gas and electric companies. Gas and electric companies may file banded rate tariffs for any nonresidential gas or electric service that is subject to effective competition from energy suppliers not regulated by the commission. When a gas or electric company files for a banded rate tariff, the filings must, at a minimum, be accompanied with the following:

(a) A statement supporting the use of a banded rate tariff rather than a tariff with fixed rates;

(b) A verifiable cost-of-service study supporting the contention that the minimum rate in the banded rate tariff covers all costs resulting from providing the service and provides a contribution to fixed costs; and

(c) Information detailing the potential effect on revenue of the proposed banded rate tariff range, as well as the effect on revenue of the current or proposed rate.