“Deferred energy accounting” defined.

“Deferred energy accounting” means an accounting practice which provides for the monthly deferral of increased or decreased energy costs experienced during a specific period and the amortization of those costs during a subsequent period to the extent that: 1. An electric utility does not collect more or less than its actual cost of fuel for electric generation and purchased power which is prudently incurred; or 2. A gas utility does not collect more or less than its actual cost of purchased gas which is prudently incurred.