Nothing in ss. 196.03, 196.19, 196.20, 196.22, 196.37, 196.60, 196.604 and 196.625 prohibits the commission from approving the filing of a tariff which permits a gas utility to enter into an individual contract with an individual customer if the term of the contract is no more than 5 years, or a longer period approved by the commission, and if the commission determines that substitute gas services are available to customers or potential customers of the gas utility and the absence of such a tariff will cause the gas utility to be disadvantaged in competing for business. A tariff filed under this section shall include the condition that any such contract shall be compensatory. The tariff shall include any other condition and procedure required by the commission in the public interest. Within 20 days after a contract authorized under this section or an amendment to such a contract has been executed, the gas utility shall submit the contract to the commission. The commission shall give notice to any person, upon request, that a contract authorized under this section has been received by the commission. The notice shall identify the gas utility that has entered into the contract. Within 6 months after receiving substantial evidence that a contract may be noncompensatory, or upon its own motion, the commission shall investigate and determine whether the contract is compensatory. If the commission determines that the contract is noncompensatory, the commission may make appropriate adjustments in the rates or tariffs of the gas utility that has entered into the contract, in addition to other remedies under this chapter. The dollar amount of the adjustment may not be less than the amount by which the contract was found to be noncompensatory.