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

Forty-fifth A, any solar powered water heating system.

Forty-fifth B, any solar or wind powered system having an electricity generating capacity not greater than 60 kilowatts.

Forty-fifth C, any solar or wind powered system having an electricity generating capacity greater than 60  kilowatts to the extent of 85% of the appraised value of the system, provided, however, that in lieu of such exemption, the owner of such a system may, in order to comply with its property tax liability obligation, execute an agreement for the payment in lieu of taxes with the municipality in which such system is sited, and said company shall be exempt from property taxes, in whole or in part, as provided in any such agreements during the terms thereof. Any such agreement shall be the result of good faith negotiations and shall be the equivalent of the property tax obligation based on full and fair cash valuation. Any such negotiated amount shall be included in the tax base for purposes of determining the levy ceiling and levy limit under section 21C and in determining minimum residential factor and classification of property under section 1A of chapter 58 of the General Laws and section 56 of chapter 40 of the General Laws. The department of revenue may issue guidelines for implementing the provisions of this subsection consistent with preserving the negotiated payment amount in the local tax base for such purpose. This clause shall not apply to projects developed under section 1A of chapter 164.

Forty-fifth D, an exemption under this clause forty-fifth shall be allowed only for a period of twenty years from the date of the installation of the system.

SECTION 2. The division of local services within the department of revenue shall study the impact and provide an estimate of the effect of the changes to chapter 59 of the General Laws contained in this act on municipal revenues. The division of local services shall submit a report detailing its findings to the clerks of the senate and the house of representatives, the chairs of the joint committee on telecommunications, utilities and energy, the chairs of the joint committee on revenue and the chairs of the joint committee on municipalities and regional government not later than 4 years after the effective date of this act.