Relates to costs and expenses of the department of public service and the public service commission; directs the public service commission to develop a formula to determine the average cost, on a per ratepayer basis, to comply with the provisions set forth in article seventy-five of the environmental conservation law; provides for a ratepayer protection tax credit; repeals certain provisions of the public service law relating to the assessment of costs and expenses of the department of public service and the public service commission.