I. Notwithstanding any provision of law to the contrary, for the purposes of ratemaking, an electric utility that has adopted special contracts prior to June 3, 1996 shall not be allowed to recover from other ratepayers the difference between the regular tariffed rate and the special contract rate, unless and only to the extent that the commission determines that it is in the public interest and equitable to other ratepayers. II. After June 3, 1996, new special contracts designed to retain load shall be available to an electric utility customer only if the utility represents that the load would otherwise have left the utility, the contract is approved pursuant to RSA 378:18, and the commission determines that no tariffed rate is sufficient to retain the load. III. After June 3, 1996, new special contracts designed to attract load shall be available to an electric utility customer only if the contract is approved pursuant to RSA 378:18 and the commission determines that no tariffed rate is sufficient to attract the load. IV. In any electric utility rate proceeding subsequent to approval of special contracts, the commission shall not impute to the utility's test year revenues or revenue requirement the difference between the regular tariffed rate and the special contract rate.