A. Subject to subsection B of this section, the department shall:

1. 1. Prescribe guidelines for applying standard appraisal methods and techniques that shall be used by the department and county assessors in determining the valuation of property.
2. 2. Prepare and maintain manuals and other necessary guidelines, consistent with this section, reflecting the standard methods and techniques to perpetuate a current inventory of taxable property and the valuation of that property.

C. In applying prescribed standard appraisal methods and techniques:

1. 1. Current usage shall be included in the formula for reaching a determination of full cash value.
2. 2. Solar energy devices, as defined in section 44-1761, grid-tied photovoltaic systems and any other device or system designed to produce solar energy primarily for on-site consumption are considered to add no value to the property on which such a device or system is installed.
3. 3. If characterized as personal property, subject to any applicable constitutional exemption from taxation, solar energy devices, as defined in section 44-1761, grid-tied photovoltaic systems and any other device or system designed to produce solar energy primarily for on-site consumption shall be valued as provided in section 42-13056.

4. 4. Energy efficient building components, renewable energy equipment and combined heat and power systems are considered to add no value to the property, if the property owner provides the county assessor with documentation of all elements that qualify pursuant to this paragraph, including documents showing actual acquisition and installation costs. The documentation must be submitted to the county assessor not later than six months before the notice of full cash value is issued for the initial evaluation year pursuant to section 42-15101 or, if the component is added after September 30 of the preceding year, not later than March 31 of the initial valuation year. For the purposes of this paragraph:

   1. (a) "Combined heat and power system" means a system that generates electricity or mechanical power and useful thermal energy in a single, integrated system such that the useful power output of the facility plus one-half the useful thermal output during any twelve-month period is not less than 42.5 percent of the total energy input of fuel to the facility.
   2. (b) "Energy efficient building components" means high performance sustainable building components installed so that the buildings or building components meet or exceed the energy efficiencies prescribed by the United States environmental protection agency energy star program or by a leadership in energy and environmental design green building rating standard developed by the United States green building council, or an equivalent green building standard, or that are at least fifteen percent more energy efficient than the international energy conservation code in effect at the time of building permit issuance.
   3. (c) "Renewable energy equipment" means equipment that is used to produce energy primarily for on-site consumption from renewable resources, including wind, forest thinnings, agricultural waste, biogas, biomass, geothermal, low-impact hydropower and solar energy not included under paragraph 2 of this subsection.