Section 139 of chapter 164 of the General Laws is hereby amended by adding after subsection (k) the following subsection:-

(l) A Class I, Class II or Class III solar net metering facility, as defined in section 138 and this section, shall be eligible to, or shall continue to receive Class I, Class II or Class III net metering credits as otherwise provided by this section if such facility is on the same parcel as any number of other such solar net metering facilities if:

(1) the systems are placed on either a municipal- or government-owned parcel, provided that all systems on the single parcel do not exceed an aggregate limit of 2MW;

(2) the systems are placed on a single parcel of land where all buildings on that parcel comprise low or moderate income housing as defined in section 20 of chapter 40B;

(3) the systems are each placed on a separate and distinct rooftop, whereby no two systems occupy the same rooftop, and provided that all systems on the single parcel do not exceed an aggregate limit of 2MW; or

(4) the systems are installed no less than 1 year after any previously installed system was placed into service, provided that all systems on the single parcel do not exceed an aggregate limit of 2MW.