Section 43 of chapter 21 of the General Laws, as appearing in the 2016 Official Edition, is hereby amended by inserting after paragraph (10) the following paragraph:-

(10½ )  A permit for  discharge from publicly owned treatment works shall require that the applicant  conduct regular systems assessments to ensure the maintenance  at all times of a reliable and sufficient source of on-site reserve power that is fully independent of the regional electricity grid and capable of operating the facility at a capacity necessary to fully meet demand for a period exceeding any reasonably anticipated unscheduled power outage from said electricity grid. The division shall promulgate regulations establishing the frequency of the reserve power assessment; provided, however, that the regulations shall require the assessments to be conducted not less frequently than quarterly.