SECTION 1. Section 5 of chapter 59 of the General Laws, as appearing in the 2016 Official Edition, is hereby amended by striking out clause Forty-fifth and inserting in place thereof the following clause:-

Forty-fifth, A solar or wind powered system that is capable of producing not more than 125 per cent of the annual electricity needs of the real property upon which it is located; provided, however, that the real property shall include contiguous or non-contiguous real property within the same municipality that is owned or leased by the owner of the real property.

Any other solar or wind powered system capable of producing more than 125 per cent of the annual electricity needs of the real property upon which it is located shall be taxable unless the owner of a solar or wind powered system has executed an agreement for payment in lieu of taxes with the municipality where such system is located or made a payment to said municipality where such system is located in accordance with an agreement for payment in lieu of taxes. A municipality, acting through the board or officer authorized by its legislative body, may execute an agreement for the payment in lieu of taxes with the owner of a solar or wind powered system in the municipality where the solar or wind powered system is located; provided, however, that, unless otherwise provided by the agreement, a notice of the payment in lieu of tax owed for each fiscal year shall be mailed to the owner and due on the dates by which a tax assessed under this chapter would be payable without interest.

An exemption under this clause shall be allowed only for a period of 20 years from the date of installation of the system; provided, however, that upon a written agreement between the owner of the solar or wind powered system and the municipality where the system is located, an exemption with a period greater than 20 years may be allowed; provided further, that an exemption shall not be allowed for any year within that period where the solar or wind powered system is not capable of producing energy as required by this clause.

This clause shall not apply to: (i) projects developed under section 1A of chapter 164; or (ii) solar and wind powered systems, including projects developed under section 139 said of chapter 164, for which the owner has executed an agreement with the municipality to make a payment in lieu of taxes under subsection (b) of section 38H of chapter 59 before July 1, 2020.

SECTION 2. Section 38H of said chapter 59, as so appearing, is hereby amended by inserting after the word “thereof”, in line 91, the following words:- ; provided, however, that for the purposes of this subsection, a “generation facility” shall not include a facility that generates electricity through solar or wind power.

SECTION 3. (a) The department of revenue, in consultation with the department of energy resources, shall solicit input from the public and issue guidance on the method for the valuation and assessment of taxes on solar and wind facilities capable of producing more than 125 per cent of the annual energy needs of the real property on which they are located. The guidance may include, but shall not be limited to: (i) standardized formulas for the calculation of property taxes; (ii) recommendations from state and regional stakeholders on the appropriate terms and schedule for payment in lieu of tax agreements; and (iii) guidelines for a standardized payment in lieu of taxes agreement, which may be based on a specified payment rate per kilowatt alternating current of installed rated capacity of the solar or wind powered system or such system's annual gross electricity revenues, including any receipt of net metering credits as defined in section 138 of chapter 164 or Massachusetts RPS-eligible renewable energy certificates received by the owner of a solar or wind powered system.

(b) A municipality may consider the guidance issued pursuant to this section in determining whether to enter into or execute an agreement for payment in lieu of taxes with the owner of a solar or wind powered system in the municipality in which the system is located; provided, however, this section shall not require a municipality to adopt such guidance. The department of revenue, in consultation with the department of energy resources, shall periodically review and update the guidance.

SECTION 4. Notwithstanding clause Forty-fifth of section 5 of chapter 59 of the General Laws, the owner of a solar or wind powered system and the municipality in which the system is located shall not be required to amend, modify or renegotiate an existing payment in lieu of tax agreement that was entered into or executed before the effect date of this act.

SECTION 5. The guidance required by section 3 shall be issued not more than 9 months after the effective date of this act.

SECTION 6. This act shall take effect on July 1, 2020.