(a) Any utility that sustains damage to its facilities as a result of a state of emergency or local state of emergency, including emergencies as defined in chapter 127A, and incurs costs related to the restoration and repair of its facilities which, if assessed only on the utility ratepayers of the affected utility service territory, may result in a rate increase of more than fifteen per cent for the average ratepayer in that utility service territory, may apply to the public utilities commission in accordance with this section to recover the costs provided herein through a monthly surcharge which shall be assessed on a statewide basis and shall be based on the utility's net restoration and repair costs; provided that the surcharge shall not result in an assessment of more than fifteen per cent for the average ratepayer in each of the other utility service territories and provided further that the public utilities commission shall exclude ratepayers in utility service territories with rates that may be substantially higher than other utility service territories in the State. The public utilities commission shall have the authority to initially set, or subsequently revise, the surcharge to reflect the actual net restoration and repair costs incurred after deduction of amounts received from outside sources of recovery. Such outside sources of recovery shall include, but not be limited to, insurance proceeds, government grants, and shareholder contributions.