SECTION 1. Section 138 of chapter 164 of the General Laws, as appearing in the 2012 Official Edition, is hereby further amended by striking out paragraph 4 and inserting, in the place thereof, the following paragraph:— ‘Class I net metering credit’, a credit equal to the excess kilowatt-hours by time of use billing period, if applicable, multiplied by the sum of the distribution company’s: (i) default service kilowatt-hour charge in the ISO-NE load zone where the customer is located; (ii) distribution kilowatt-hour charge; (iii) transmission kilowatt-hour charge; and (iv) transition kilowatt-hour charge; provided, however, that this shall not include the demand side management and renewable energy kilowatt-hour charges set forth in sections 19 and 20 of chapter 25; and provided further, that credit for a Class I net metering facility not using more than 50% of the facility’s on site generation, as compared to the three (3) year average use on the site, shall be equal to the excess kilowatt-hours by time of use billing period, if applicable, multiplied by the monthly basic service price for the applicable rate class; and provided further, that credit for a Class I net metering facility that is not an agricultural net metering facility or is not using solar, anaerobic digestion or wind as its energy source shall be the average monthly clearing price at the ISO-NE.

SECTION 2. Section 138 of chapter 164 of the General Laws, as so appearing, is hereby amended by striking out paragraph 6 and inserting, in the place thereof, the following paragraph:— ‘Class II net metering credit’, a credit equal to the excess kilowatt-hours by time of use billing period, if applicable, multiplied by the sum of the distribution company’s: (i) default service kilowatt-hour charge in the ISO-NE load zone where the customer is located; (ii) distribution kilowatt-hour charge; (iii) transmission kilowatt-hour charge; and (iv) transition kilowatt-hour charge; provided, however, that this shall not include the demand side management and renewable energy kilowatt-hour charges set forth in sections 19 and 20 of chapter 25; and provided, further, that credit for a Class II net metering facility not using more than 50% of the facility’s on site generation, as compared to the three (3) year average use on the site, shall be equal to the excess kilowatt-hours by time of use billing period, if applicable, multiplied by the monthly basic service price for the applicable rate class.

SECTION 2. Section 138 of chapter 164, as so appearing, is hereby amended by striking out paragraph 8 and inserting, in the place thereof, the following paragraph:— ‘Class III net metering credit’, a credit equal to the excess kilowatt-hours by time of use billing period, if applicable, multiplied by the sum of the distribution company’s: (i) default service kilowatt-hour charge in the ISO-NE load zone where the customer is located; (ii) transmission kilowatt-hour charge; and (iii) transition kilowatt-hour charge; provided, however, that for a Class III net metering facility of a municipality or other governmental entity, the credit shall be equal to the excess kilowatt-hours multiplied by the sum of (i), (ii) and (iii) and the distribution kilowatt-hour charge; and provided further, that this shall not include the demand side management and renewable energy kilowatt-hour charges set forth in sections 19 and 20 of chapter 25; and provided, further, that credit for a Class III net metering facility not using more than 50% of the facility’s on site generation, as compared to the three (3) year average use on the site, shall be equal to the excess kilowatt-hours by time of use billing period, if applicable, multiplied by the monthly basic service price for the applicable rate class.