"Average rate assumption method" means the method under which the excess tax reserve is reduced over the remaining lives of the property as used in the utility's regulated books of account which gave rise to the reserve for deferred income taxes, as noted in section 203(e), "Excess Deferred Taxes Related to Changes in Tax Rates," of the Tax Reform Act of 1986.
Nev. Admin. Code § 704.6506
NRS 703.025, 704.210